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HP OpenVMS DCL Dictionary
SHOW MEMORY
Displays the availability and usage of those system resources that are
related to memory.
Format
SHOW MEMORY
Parameters
None.
Description
The information provided by the SHOW MEMORY command can help you
determine whether to change certain system memory resources to improve
system performance. The system memory resources are as follows:
Physical memory
Process entry slots and balance slots
Nonpaged and paged dynamic memory
Space in paging and swapping files
File data cache memory usage
When the SHOW MEMORY command is executed, a display is written to
SYS$OUTPUT. Depending on which qualifiers you specify, the display
shows the following memory resource statistics:
Physical memory usage
Bad page list
Number of pages allocated to an OpenVMS system
Slot usage
Dynamic memory usage (in bytes)
Paging file usage (in blocks)
Dynamic memory
Granularity hint regions for code and data (Alpha/Integrity servers
only)
Extended File Cache facility (Alpha/Integrity servers only)
Write bitmap (WBM) memory use (Alpha/Integrity servers only)
For a detailed description of each item displayed, see the examples.
Qualifiers
/ALL (default)
Displays all available information, that is, information displayed by
the /FILES, /PHYSICAL_PAGES, /POOL, and /SLOTS qualifiers.
/BITMAP (Alpha/Integrity servers only)
Displays information about memory use by write bitmaps (WBM) used with
Host-Based Volume Shadowing (HBVS). If the system parameter SHADOWING
is set to 0, no information about bitmaps is displayed because WBM is
used only with HBVS.
Note that the memory consumption displayed by SHOW MEMORY is often
greater than that displayed by SHOW DEVICE /BITMAP, which displays the
exact size (in bytes) of the bitmap. The memory used by a bitmap is
allocated in units of pages; if a bitmap uses part of a page of memory,
the rest of that page is unavailable for use.
/BUFFER_OBJECTS (Alpha/Integrity servers only)
Displays information about system resources used by buffer objects.
/CACHE[=(keyword[,...])]
Displays information about the Virtual I/O Cache facility or the
Extended File Cache facility, depending on which is loaded. The Cache
facility information is displayed as part of the SHOW MEMORY and SHOW
MEMORY/CACHE/FULL commands.
If the Extended File Cache is loaded, you can specify the following
keywords and options:
VOLUME[=device]
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Requests display of volume-level statistics for the specified
volume(s). If no device is specified, defaults to SYS$DISK. Device
specifications may be wildcarded; if so, the device specification must
be based on the physical device name. Specify VOLUME=* to see
statistics for all volumes in cache.
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FILE=filespec
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Requests display of file-level statistics for the specified file(s) in
cache. The filespec must contain an explicit or implicit device
specification. The filespec may be wildcarded according to RMS rules.
Specify FILE=dev:*.* to see statistics for all files in cache for a
device. Partially wild file specifications that are satisfied by large
numbers of files on disk may incur significant processing overhead
during display. By default, both open and closed files are displayed
(use the OPEN and CLOSED keywords to further restrict which files are
displayed).
Note that this command may fail if you select a large number of
files for display. If you receive an error message, reduce the number
of selected files and reissue the command.
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TOPQIO[=
n]
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Requests display of file-level statistics for the
n files in cache with the highest overall QIO count (
n defaults to 10).
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TOPHITRATE[=
n]
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Requests display of file-level statistics for the
n files in cache with the highest overall cache hit rate (
n defaults to 10).
OPEN
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Include only open files in the display (default for TOPQIO and
TOPHITRATE).
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CLOSED
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Include only closed files in the display.
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/EXACT
Use with the /PAGE=SAVE and /SEARCH qualifiers to specify a search
string that must match the search string exactly and must be enclosed
with quotation marks (" ").
If you specify the /EXACT qualifier without the /SEARCH qualifier,
exact search mode is enabled when you set the search string with the
Find (E1) key.
/FILES
Displays information about the use of each paging and swapping file
currently installed.
/FULL
When used with /POOL, displays additional information about pool area.
When used with /CACHE, displays additional information about the file
data cache that is loaded (either VIOC or XFC).
This qualifier is ignored unless the /CACHE or /POOL qualifier is
specified explicitly.
/GH_REGIONS
On Alpha, displays information about the granularity hint regions (GHR)
that have been established. For each of these regions, information is
displayed about the size of the region, the amount of free memory, the
amount of memory in use, and the amount of memory released to OpenVMS
from the region. The granularity hint regions information is also
displayed as part of SHOW MEMORY, SHOW MEMORY/ALL, and SHOW MEMORY/FULL
commands.
/HIGHLIGHT[=keyword]
Use with the /PAGE=SAVE and /SEARCH qualifiers to specify the type of
highlighting you want when a search string is found. When a string is
found, the entire line is highlighted. You can use the following
keywords: BOLD, BLINK, REVERSE, and UNDERLINE. BOLD is the default
highlighting.
/OUTPUT[=filespec]
/NOOUTPUT
Controls where the output of the command is sent. If you do not enter
the qualifier, or if you enter the /OUTPUT qualifier without a file
specification, the output is sent to the current process default output
stream or device, identified by the logical name SYS$OUTPUT.
If you enter the /OUTPUT qualifier with a partial file specification
(for example, specifying only a directory), SHOW is the default file
name and .LIS the default file type. If you enter a file specification,
it cannot include asterisk (*) and the percent sign (%) wildcard
characters.
If you enter the /NOOUTPUT qualifier, output is suppressed.
/PAGE[=keyword]
/NOPAGE (default)
Controls the display of memory information on the screen.
You can use the following keywords with the /PAGE qualifier:
CLEAR_SCREEN
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Clears the screen before each page is displayed.
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SCROLL
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Displays information one line at a time.
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SAVE[=
n]
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Enables screen navigation of information, where
n is the number of pages to store.
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The /PAGE=SAVE qualifier allows you to navigate through screens of
information. The /PAGE=SAVE qualifier stores up to 5 screens of up to
255 columns of information. When you use the /PAGE=SAVE qualifier, you
can use the following keys to navigate through the information:
Key Sequence |
Description |
Up arrow key, Ctrl/B
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Scroll up one line.
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Down arrow key
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Scroll down one line.
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Left arrow key
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Scroll left one column.
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Right arrow key
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Scroll right one column.
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Find (E1)
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Specify a string to find when the information is displayed.
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Insert Here (E2)
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Scroll right one half screen.
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Remove (E3)
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Scroll left one half screen.
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Select (E4)
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Toggle 80/132 column mode.
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Prev Screen (E5)
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Get the previous page of information.
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Next Screen (E6), Return, Enter, Space
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Get the next page of information.
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F10, Ctrl/Z
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Exit. (Some utilities define these differently.)
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Help (F15)
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Display utility help text.
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Do (F16)
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Toggle the display to oldest/newest page.
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Ctrl/W
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Refresh the display.
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The /PAGE qualifier is not compatible with the /OUTPUT qualifier.
/PHYSICAL_PAGES
Displays information about the amount of physical memory and the number
of free and modified pages.
/POOL
Displays information about the usage of each dynamic memory (pool)
area, including the amount of free space and the size of the largest
contiguous block in each area.
/RESERVED (Alpha/Integrity servers only)
Displays information about memory reservations.
/SEARCH="string"
Use with the /PAGE=SAVE qualifier to specify a string that you want to
find in the information being displayed. Quotation marks are required
for the /SEARCH qualifier, if you include spaces in the text string.
You can also dynamically change the search string by pressing the Find
key (E1) while the information is being displayed. Quotation marks are
not required for a dynamic search.
/SLOTS
Displays information about the availability of partition control block
(PCB) vector slots and balance slots.
/UNITS=keyword
Allows you to override the current default specified by SET
PROCESS/UNITS so that you can display memory in your choice of blocks
or bytes.
Keyword options are:
Option |
Description |
BLOCKS
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Displays memory in blocks (equivalent to PAGES).
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BYTES
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Displays memory in bytes.
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PAGES
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Displays memory in page format (equivalent to BLOCKS).
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/WRAP
/NOWRAP (default)
Use with the /PAGE=SAVE qualifier to limit the number of columns to the
width of the screen and to wrap lines that extend beyond the width of
the screen to the next line.
The /NOWRAP qualifier extends lines beyond the width of the screen and
can be seen when you use the scrolling (left and right) features
provided by the /PAGE=SAVE qualifier.
Examples
#1 |
$ SHOW MEMORY
System Memory Resources on 20-JAN-2001 15:22:04.11
Physical Memory Usage (pages): Total Free In Use Modified
Main Memory (2.00Gb) 262144 201249 60162 733
Extended File Cache (Time of last reset: 18-JAN-2001 17:15:14.33)
Allocated (Mbytes) 370.00 Maximum size (Mbytes) 1024.00
Free (Mbytes) 317.79 Minimum size (Mbytes) 370.00
In use (Mbytes) 52.20 Percentage Read I/Os 72%
Read hit rate 96% Write hit rate 0%
Read I/O count 119363 Write I/O count 46259
Read hit count 115283 Write hit count 0
Reads bypassing cache 45 Writes bypassing cache 0
Files cached open 372 Files cached closed 392
Vols in Full XFC mode 0 Vols in VIOC Compatible mode 3
Vols in No Caching mode 0 Vols in Perm. No Caching mode 0
Granularity Hint Regions (pages): Total Free In Use Released
Execlet code region 1024 0 586 438
Execlet data region 256 0 256 0
S0/S1 Executive data region 576 0 576 0
Resident image code region 1024 0 830 194
Slot Usage (slots): Total Free Resident Swapped
Process Entry Slots 647 614 33 0
Balance Set Slots 645 614 31 0
Dynamic Memory Usage: Total Free In Use Largest
Nonpaged Dynamic Memory (Mb) 4.28 2.38 1.89 2.25
Bus Addressable Memory (Kb) 168.00 128.00 40.00 128.00
Paged Dynamic Memory (Mb) 5.68 3.42 2.26 3.41
Lock Manager Dyn Memory (Mb) 1.13 0.00 1.12
Buffer Object Usage (pages): In Use Peak
32-bit System Space Windows (S0/S1) 3 3
64-bit System Space Windows (S2) 0 0
Physical pages locked by buffer objects 3 3
Memory Reservations (pages): Group Reserved In Use Type
VCC$MIN_CACHE_SIZE --- 47360 47360 Allocated
Total (370.00 Mbytes reserved) 47360 47360
Swap File Usage (8KB pages): Index Free Size
DISK$X6XV_BRAHMA:[SYS0.SYSEXE]SWAPFILE.SYS
1 5168 5168
Paging File Usage (8KB pages): Index Free Size
DISK$X6XV_BRAHMA:[SYS0.SYSEXE]PAGEFILE.SYS
254 215288 215288
Total committed paging file usage: 7418
Of the physical pages in use, 4951 pages are permanently allocated to
OpenVMS.
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This example shows reservable pages. If the reservable pages are a
negative value, this indicates that you may want to consider adding to
the fixed amount of pagefile space available.
#2 |
$ SHOW MEMORY/CACHE/FULL
System Memory Resources on 3-NOV-2001 18:36:12.79
Extended File Cache (Time of last reset: 31-OCT-2001 10:18:07.39)
Allocated (Mbytes) (1)370.00 Maximum size (Mbytes) (9)1024.00
Free (Mbytes) (2)319.75 Minimum size (Mbytes) (10) 370.0
In use (Mbytes) (3) 50.25 Percentage Read I/Os (11) 98%
Read hit rate (4) 79% Write hit rate (12) 0%
Read I/O count (5) 18110 Write I/O count (13) 310
Read hit count (6) 14343 Write hit count (14) 0
Reads bypassing cache (7) 37 Writes bypassing cache (15) 0
Files cached open (8) 351 Files cached closed (16) 307
Vols in Full XFC mode (17) 0 Vols in VIOC Compatible mode (17) 0
Vols in No Caching mode(17) 0 Vols in Perm No Caching mode (17) 0
I/O Statistics (18) - Distributions (MAX_IO_SIZE: 127 (19))
-------------------------------------------------------
Transfer Size: Reads Read Hits Writes
1 Block IO: 35053 (20) 34553 (21) 87 (22)
2 Block IO: 469 284 9
3 Block IO: 26516 26346 24
4 Block IO: 348 205 6
5 Block IO: 13205 13160 0
6 Block IO: 161 111 0
7 Block IO: 185 152 0
.
.
.
114 Block IO: 1 0 0
116 Block IO: 2 1 0
121 Block IO: 1 0 0
>127<256 Block IO: 12 0
>255 Block IO: 14 0
----------------------------------------------------
Totals: 84411 80535 630
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Note
This example shows the output for the SHOW MEMORY/CACHE/FULL command on
an Alpha system with the Extended File Cache loaded. The SHOW
MEMORY/CACHE/FULL command will display different fields on an Alpha
system with the Virtual I/O Cache loaded.
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Extended File Cache Usage
Shows the use of the Extended File Cache facility on an Alpha system.
(1) Allocated
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Total amount of system memory in megabytes allocated to the Extended
File Cache.
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(2) Free
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Number of allocated megabytes not currently in use by the cache.
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(3) In use
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Number of allocated megabytes that contain valid cached data.
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(4) Read hit rate
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Shows cache read hits as a percentage of read I/Os.
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(5) Read I/O count
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Total number of read I/Os that have been seen by the cache since the
last statistics reset.
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(6) Read hit count
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Total number of read I/Os that did not perform a physical I/O, because
the data for these was found in the cache since the prior statistics
reset.
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(7) Reads bypassing cache
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Total number of reads that bypassed the cache and went directly to disk
since the last statistics reset.
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(8) Files cached open
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Total number of open files in cache.
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(9) Maximum size (Mbytes)
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Maximum size of the cache in megabytes.
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(10) Minimum size (Mbytes)
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Minimum size of the cache in megabytes. This displays the value of the
memory reservation, VCC$MIN_CACHE_SIZE. See the HP OpenVMS System Manager's Manual for
additional information.
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(11) Percentage Read I/Os
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Percentage of read I/Os that occur. For example, a read/write I/O ratio
of 100% implies that all were read I/Os.
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(12) Write hit rate
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(Always zero for Extended File Cache, Version 1.)
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(13) Write I/O count
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Total number of write I/Os that have been seen by the cache since the
last statistics reset.
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(14) Write hit count
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(Always zero for Extended File Cache, Version 1.)
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(15) Writes bypassing cache
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Total number of writes that bypassed the cache and went directly to
disk since the last statistics reset.
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(16) Files cached closed
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Total number of closed files in cache.
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(17) Volume modes
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Total number of volumes in each caching state. Note that the initial
release of XFC only supports VIOC compatible mode. Future releases will
support full mode.
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(18) I/O Statistics
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Systemwide distribution of I/O sizes (rounded up).
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(19) MAX_IO_SIZE
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Current setting of the system parameter VCC_MAX_IO_SIZE in blocks. The
extended file cache (XFC) will only cache files up to this size.
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(20) Reads
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Number of reads for the entire system.
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(21) Read Hits
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Number of reads satisfied from the cache.
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(22) Writes
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Number of writes for the entire system.
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#3 |
$ SHOW MEMORY/CACHE=(VOLUME=*)
System Memory Resources on 20-JAN-2001 15:35:32.51
Extended File Cache Volume Statistics:
_$7$DKA200: (DISK$X6XV_BRAHMA), Caching mode is VIOC Compatible
Open files (1) 372 Closed files (9) 395
Files ever opened (2) 1007 Files ever deposed (10) 240
Allocated pages (3) 6405 Locks acquired (11) 736
Total QIOs (4) 166552 Read hits (12) 115984
Virtual reads (5) 120068 Virtual writes (13) 46484
Hit rate (6) 69 % Read aheads (14) 11766
Read throughs (7) 120021 Write throughs (15) 46484
Read arounds (8) 47 Write arounds (16) 0
Ave Disk I/O Resp Time incl cache hits (microseconds)(17) 3497
Total of 1 volumes in cache
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Extended File Cache Usage
Shows the use of the Extended File Cache facility on an Alpha system.
(1) Open files
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Number of files that are currently open and cached by the extended file
cache on this volume at the instant the SHOW command was issued.
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(2) Files ever opened
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Number of times the extended file cache has been requested to open a
file on this volume.
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(3) Allocated pages
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Number of main memory data pages currently being used by the extended
file cache to contain actual file data, for this volume.
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(4) Total QIOs
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Total number of QIO and PAGE I/O calls received by the extended file
cache on this volume.
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(5) Virtual reads
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Cumulative number of Virtual Read requests received by the extended
file cache on this volume.
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(6) Hit rate
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Percentage of Total QIOs that were completed by copying data from
cache, rather than issuing real I/O to a volume.
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(7) Read throughs
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Number of Virtual Reads that are capable of being satisfied by the
extended file cache.
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(8) Read arounds
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Number of Virtual Reads that cannot be satisfied by the extended file
cache. Reasons for this include the presence of a non-XFC compliant
node in an OpenVMS cluster, and the receipt of an I/O that is larger
than VCC_MAX_IO_SIZE.
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(9) Closed files
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Number of closed files the extended file cache has in memory. If a
subsequent file access occurs, data will be accessible from main memory
rather than having to issue I/O to the real volume.
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(10) Files ever deposed
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Files removed from memory. Reasons the extended file cache may remove a
file from its memory include requests for memory from the rest of the
system, and conflicting access modes in a cluster.
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(11) Locks acquired
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Current number of file access locks that are in use on this volume.
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(12) Read hits
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Cumulative number of times a read has been satisfied from the data
cache.
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(13) Virtual writes
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Cumulative number of virtual write I/Os received on this volume by the
cache.
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(14) Read aheads
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Cumulative number of times the extended file cache issued read ahead
I/Os on this volume after detecting sequential file I/O virtual reads.
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(15) Write throughs
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Cumulative number of times a virtual write has been capable of
modifying cached data.
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(16) Write arounds
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Cumulative number of times a virtual write has been detected that
cannot update data in cache memory.
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(17) Average Disk I/O Response Time
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Average disk I/O response time, including cache hits, in microseconds.
Note that on a symmetric multiprocessing (SMP) system, the response
time only includes that of I/Os starting or finishing on the same CPU.
Any physical I/Os are ignored.
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#4 |
$ SHOW MEMORY/CACHE=(VOL=DKA100,TOPQIO=3)
System Memory Resources on 3-NOV-2001 18:36:12.79
Extended File Cache Top QIO File Statistics:
_$7$DKA200: (DISK$X6Y0_RESD), Caching mode is VIOC Compatible
_$7$DKA200:[SYS0.SYSEXE]SYSDUMP.DMP;2 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages (1) 334 Total QIOs (6) 1712
Read hits (2) 1559 Virtual reads (7) 1712
Virtual writes (3) 0 Hit rate (8) 91 %
Read aheads (4) 0 Read throughs (9) 0
Write throughs (5) 0 Read arounds (10) 0
Write arounds (11) 0
_$7$DKA200:[VMS$COMMON.SYSEXE]SYS$QUEUE_MANAGER.QMAN$JOURNAL;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 931 Total QIOs 1057
Read hits 5 Virtual reads 1044
Virtual writes 13 Hit rate 0 %
Read aheads 2 Read throughs 1044
Write throughs 13 Read arounds 0
Write arounds 0
_$7$DKA200:[VMS$COMMON.SYSLIB]DECC$SHR.EXE;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 135 Total QIOs 730
Read hits 673 Virtual reads 730
Virtual writes 0 Hit rate 0 %
Read aheads 2 Read throughs 0
Write throughs 0 Read arounds 0
Write arounds 0
Total of 3 files for this volume
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Extended File Cache Top QIO File Statistics Usage
Shows the use of the Extended File Cache Top QIO File Statistics
facility on an Alpha system.
(1) Allocated pages
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Number of main memory data pages currently being used by the extended
file cache to contain actual file data, for this volume
|
(2) Read hits
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Cumulative number of times a read has been satisfied from the data
cache.
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(3) Virtual writes
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Cumulative number of virtual write I/Os received on this volume by the
cache.
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(4) Read aheads
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Cumulative number of times the extended file cache issued read ahead
I/Os on this volume after detecting sequential file I/O virtual reads.
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(5) Write throughs
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Cumulative number of times a virtual write has been capable of
modifying cached data.
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(6) Total QIOs
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Total number of QIO and PAGE I/O calls received by the extended file
cache on this volume.
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(7) Virtual reads
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Cumulative number of Virtual Read requests received by the extended
file cache on this volume.
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(8) Hit rate
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Percentage of Total QIOs that were completed by copying data from
cache, rather than issuing real I/O to a volume.
|
(9) Read throughs
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Number of Virtual Reads that are capable of being satisfied by the
extended file cache.
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(10) Read arounds
|
Number of Virtual Reads that cannot be satisfied by the extended file
cache. Reasons for this include the presence of a non-XFC compliant
node in an OpenVMS cluster, and the receipt of an I/O that is larger
than VCC_MAX_IO_SIZE.
|
(11) Write arounds
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Cumulative number of times a virtual write has been detected that
cannot update data in cache memory.
|
#5 |
$ SHOW MEMORY/CACHE=(VOL=DKA100,TOPHITRATE=3)
System Memory Resources on 3-NOV-2001 18:36:12.79
Extended File Cache Top Hitrate File Statistics:
_$7$DKA200: (DISK$X6Y0_RESD), Caching mode is VIOC Compatible
_$7$DKA200:[VMS$COMMON.SYSLIB]SMGSHR.EXE;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages (1) 16 Total QIOs (6) 277
Read hits (2) 267 Virtual reads (7) 277
Virtual writes (3) 0 Hit rate (8) 96 %
Read aheads (4) 0 Read throughs (9) 277
Write throughs (5) 0 Read arounds (10) 0
Write arounds (11) 0
_$7$DKA200:[VMS$COMMON.SYSLIB]UTIL$SHARE.EXE;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 8 Total QIOs 185
Read hits 178 Virtual reads 185
Virtual writes 0 Hit rate 96 %
Read aheads 1 Read throughs 185
Write throughs 0 Read arounds 0
Write arounds 0
_$7$DKA200:[VMS$COMMON.SYSLIB]CMA$TIS_SHR.EXE;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 6 Total QIOs 165
Read hits 159 Virtual reads 165
Virtual writes 0 Hit rate 96 %
Read aheads 2 Read throughs 165
Write throughs 0 Read arounds 0
Write arounds 0
Total of 3 files for this volume
|
Extended File Cache Top Hitrate File Statistics Usage
Shows the use of the Extended File Cache Top Hitrate File Statistics
facility on an Alpha system.
(1) Allocated pages
|
.Number of main memory data pages currently being used by the extended
file cache to contain actual file data, for this volume
|
(2) Read hits
|
Cumulative number of times a read has been satisfied from the data
cache.
|
(3) Virtual writes
|
Cumulative number of virtual write I/Os received on this volume by the
cache.
|
(4) Read aheads
|
Cumulative number of times the extended file cache issued read ahead
I/Os on this volume after detecting sequential file I/O virtual reads.
|
(5) Write throughs
|
Cumulative number of times a virtual write has been capable of
modifying cached data.
|
(6) Total QIOs
|
Total number of QIO and PAGE I/O calls received by the extended file
cache on this volume.
|
(7) Virtual reads
|
Cumulative number of Virtual Read requests received by the extended
file cache on this volume.
|
(8) Hit rate
|
Percentage of Total QIOs that were completed by copying data from
cache, rather than issuing real I/O to a volume.
|
(9) Read throughs
|
Number of Virtual Reads that are capable of being satisfied by the
extended file cache.
|
(10) Read arounds
|
Number of Virtual Reads that cannot be satisfied by the extended file
cache. Reasons for this include the presence of a non-XFC compliant
node in an OpenVMS cluster, and the receipt of an I/O that is larger
than VCC_MAX_IO_SIZE.
|
(11) Write arounds
|
Cumulative number of times a virtual write has been detected that
cannot update data in cache memory.
|
#6 |
$ SHOW MEMORY/CACHE=(FILE=SYS$LOGIN:*.*,OPEN,CLOSED)
System Memory Resources on 3-NOV-2001 18:36:12.79
Extended File Cache Statistics:
_$7$DKA200:[SYS0.SYSMGR]ACCOUNTNG.DAT;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages (1) 1 Total QIOs (6) 17
Read hits (2) 0 Virtual reads (7) 1
Virtual writes (3) 16 Hit rate (8) 0 %
Read aheads (4) 0 Read throughs (9) 0
Write throughs (5) 16 Read arounds (10) 0
Write arounds (11) 0
_$7$DKA200:[SYS0.SYSMGR]ACME$SERVER.LOG;129 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 1 Total QIOs 2
Read hits 0 Virtual reads 1
Virtual writes 1 Hit rate 0 %
Read aheads 0 Read throughs 1
Write throughs 1 Read arounds 0
Write arounds 0
_$7$DKA200:[SYS0.SYSMGR]CLUE$STARTUP_BRAHMA.LOG;935 (closed)
Caching is enabled, active caching mode is Write Through
Allocated pages 2 Total QIOs 32
Read hits 0 Virtual reads 0
Virtual writes 32 Hit rate 0 %
Read aheads 0 Read throughs 0
Write throughs 32 Read arounds 0
Write arounds 0
.
.
.
_$7$DKA200:[VMS$COMMON.SYSMGR]VMS$AUDIT_SERVER.DAT;1 (open)
Caching is enabled, active caching mode is Write Through
Allocated pages 1 Total QIOs 8
Read hits 3 Virtual reads 8
Virtual writes 0 Hit rate 37 %
Read aheads 1 Read throughs 8
Write throughs 0 Read arounds 0
Write arounds 0
Total of 50 files for this volume
|
Extended File Cache Statistics Usage
Shows the use of the Extended File Cache Statistics facility on an
Alpha system.
(1) Allocated pages
|
.Number of main memory data pages currently being used by the extended
file cache to contain actual file data, for this volume
|
(2) Read hits
|
Cumulative number of times a read has been satisfied from the data
cache.
|
(3) Virtual writes
|
Cumulative number of virtual write I/Os received on this volume by the
cache.
|
(4) Read aheads
|
Cumulative number of times the extended file cache issued read ahead
I/Os on this volume after detecting sequential file I/O virtual reads.
|
(5) Write throughs
|
Cumulative number of times a virtual write has been capable of
modifying cached data.
|
(6) Total QIOs
|
Total number of QIO and PAGE I/O calls received by the extended file
cache on this volume.
|
(7) Virtual reads
|
Cumulative number of Virtual Read requests received by the extended
file cache on this volume.
|
(8) Hit rate
|
Percentage of Total QIOs that were completed by copying data from
cache, rather than issuing real I/O to a volume.
|
(9) Read throughs
|
Number of Virtual Reads that are capable of being satisfied by the
extended file cache.
|
(10) Read arounds
|
Number of Virtual Reads that cannot be satisfied by the extended file
cache. Reasons for this include the presence of a non-XFC compliant
node in an OpenVMS cluster, and the receipt of an I/O that is larger
than VCC_MAX_IO_SIZE.
|
(11) Write arounds
|
Cumulative number of times a virtual write has been detected that
cannot update data in cache memory.
|
#7 |
$ SHOW MEMORY/PHYSICAL_PAGES
System Memory Resources on 3-NOV-2001 16:11:30.76
Physical Memory Usage (pages): Total (1) Free (2) In Use (3) Modified (4)
Main Memory (32.00Mb) 65536 44233 20955 308
Of the physical pages in use, 10970 pages are permanently allocated
to VMS.
|
Physical Memory Usage
Shows the use of physical memory.
(1) Total
|
Number of physical memory pages available for general system use.
Multiport memory pages used for shared memory global sections,
mailboxes, and common event blocks are not included in this number.
|
(2) Free
|
Number of pages on the free page list.
|
(3) In Use
|
Number of pages currently being used. This number is calculated by
adding the number of pages on the free, modified, and bad lists and
then subtracting that sum from the total number of available pages.
|
(4) Modified
|
Number of pages on the modified page list.
|
Bad Page List
Shows the contents of the bad page list.
Note
This display is written only when there are pages on the bad page list.
|
Total
|
Number of pages on the bad page list.
|
Dynamic
|
Number of memory errors detected after the system was booted.
|
I/O Errors
|
Number of errors detected during page fault handling.
|
Static
|
Number of memory errors detected during boot-time scan.
|
By default, either single-bit or double-bit errors cause the pages to
be removed during the boot-time scan.
Pages Allocated to OpenVMS
Any SHOW MEMORY display that includes the physical memory display
concludes with the number of pages permanently allocated to the OpenVMS
system. These pages include nonpaged executive code and data, the PFN
database, nonpaged dynamic memory, the interrupt stack, and the system
page table.
#8 |
$ SHOW MEMORY/SLOTS
System Memory Resources on 3-NOV-2001 16:11:35.31
Slot Usage (slots): Total (1) Free (2) Resident (3) Swapped (4)
Process Entry Slots 75 28 46 1
Balance Set Slots 70 26 44 0
|
Slot Usage (slots)
Displays the use of process entry slots and balance set slots.
(1) Total
|
Number of process entry slots (the value of the system parameter
MAXPROCESSCNT) and balance set slots (the value of the system parameter
BALSETCNT) permanently allocated when the system was bootstrapped.
|
(2) Free
|
Number of slots currently available.
|
(3) Resident
|
Number of slots currently used by memory-resident processes. The number
of balance set slots in use can never be any larger than the number of
process entry slots in use because the SWAPPER and NULL processes have
process entry slots but do not require balance set slots.
|
(4) Swapped
|
Number of slots used by outswapped processes. For process entry slots,
this number includes all processes that have been partially outswapped.
For balance set slots, this number includes those processes that have
had their process bodies outswapped but have process headers that are
still resident.
|
#9 |
$ SHOW MEMORY/POOL
System Memory Resources on 5-DEC-2001 03:59:35.29
Dynamic Memory Usage (bytes): Total (1) Free (2) In Use (3) Largest (4)
Nonpaged Dynamic Memory 24993792 23511872 1481920 23363776
Bus Addressable Memory 131072 114688 16384 114688
Paged Dynamic Memory 5799936 3530784 2269152 3530176
Lock Manager Dynamic Memory 1048576 254976 793600
|
Dynamic Memory Usage (in bytes)
Shows the use of the nonpaged and paged pool areas that allocate
variably sized blocks.
(1) Total
|
Total number of bytes set aside for each area.
|
(2) Free
|
Total amount of free space in each dynamic memory area.
|
(3) In Use
|
Amount of space currently allocated from each area. This number is the
total size minus the number of free bytes.
|
(4) Largest
|
Size of the largest contiguous block in each area. For the paged pool,
this number represents the largest block that can be allocated. For the
nonpaged pool, an allocation request larger than this number will cause
the nonpaged pool to grow (if other constraints allow growth). This
attribute does not apply to the lock manager, as all items for the lock
manager are the same size.
|
#10 |
$ SHOW MEMORY/POOL/FULL
System Memory Resources on 5-DEC-2001 03:59:35.29
Nonpaged Dynamic Memory (Lists + Variable)
Current Size (bytes) (1) 24993792 Current Size (pagelets) (1) 48816
Initial Size (NPAGEDYN) (2) 24993792 Initial Size (pagelets) (2) 48816
Maximum Size (NPAGEVIR) (3)499998720 Maximum Size (pagelets) (3) 976560
Free Space (bytes) (4) 22230144 Space in Use (bytes) (5)2763648
Largest Variable Block (6) 19676672 Smallest Variable Block (7) 2176
Number of Free Blocks (8) 38334 Free Blocks LEQU 64 Bytes(9) 0
Free Blocks on Lookasides(16) 38330 Lookaside Space (bytes) 2537472
Bus Addressable Memory (Lists + Variable)
Current Size (bytes) (1) 131072 Current Size (pagelets) (1) 256
Initial Size (NPAGEDYN) (2) 131072 Initial Size (pagelets) (2) 256
Free Space (bytes) (4) 114688 Space in Use (bytes) (5) 16384
Largest Variable Block (6) 114688 Smallest Variable Block (7) 114688
Number of Free Blocks (8) 1 Free Blocks LEQU 64 Bytes(9) 0
Free Blocks on Lookasides(16) 0 Lookaside Space (bytes) 0
Paged Dynamic Memory (Lists + Variable)
Current Size (MB) (1) 22.88 Current Size (pagelets) (1) 46864
Free Space (MB) (4) 21.96 Space in Use (MB) (5) 0.91
Largest Variable Block (6) 21.77 Smallest Variable Block(MB)(7)21.77
Number of Free Blocks (8) 166 Free Blocks LEQU 64 Bytes (9) 4
Free Blocks on Lookasides(16) 165 Lookaside Space (KB) 201.85
Over-limit Lookaside Blocks(17) 3 Over-limit Space (KB) 7.45
Lock Manager Dynamic Memory
Current Size (Mbytes) (1) 13.85 Current Size (pages) (1) 1774
Free Space (Mbytes) (4) 10.06 Hits (12) 54050
Space In Use (5) 3.79 Misses (13) 1664
Number of Empty Pages (10) 26 Expansions (14) 1792
Number of Free Packets (11) 41244 Packet Size (15) 256
|
Dynamic Memory
Shows the use of dynamic memory areas consisting of variably sized
blocks.
(1) Current Size
|
Current size (in 512-byte pagelets on Alpha ) of each dynamic memory
area. For the lock manager display, the unit of measurement is
megabytes.
|
(2) Initial Size
|
Initial size of nonpaged dynamic memory and the name of the system
parameter (NPAGEDYN) that controls this size.
|
(3) Maximum Size
|
Maximum size to which nonpaged dynamic memory can grow and the name of
the system parameter (NPAGEVIR) that controls this size.
|
(4) Free Space
|
Amount of free space in each dynamic memory area.
|
(5) Space in Use
|
Amount of space currently allocated from each area.
|
(6) Largest Block
|
Size of the largest contiguous area in each pool area.
|
(7) Smallest Block
|
Size of the smallest hole (free block) in each pool area.
|
(8) Free Blocks
|
Total number of free blocks in each pool area. The size of this number
is a measure of pool fragmentation.
|
(9) Blocks LEQU 64
|
Number of free blocks that are 64 bytes long or shorter. This number is
another measure of pool fragmentation because while allocation of these
small blocks is unlikely, they contribute to the allocation time
whenever an allocation request is made.
|
(10) Empty Pages
|
Number of pages that do not have any packets allocated.
|
(11) Free Packets
|
Total number of packets not in use. This number is the sum of free
packets from partially used pages and the packets of all Empty Pages.
|
(12) Hits
|
Total number of packet allocations.
|
(13) Misses
|
Total number of packet allocation requests that could not be satisfied
because the number of packets requested were not available. A miss
causes dynamic memory to expand by one page to satisfy the packet
allocation request.
|
(14) Expansions
|
Total number of times that dynamic memory increased by a page to
satisfy packet allocation requests.
|
(15) Packet Size
|
Packet size of 256 bytes, which is used by the lock manager to hold
either a lock block data structure or a resource block data structure.
|
(16) Lookasides Free Blocks
|
Total number of memory packets placed on "lookaside lists". If a packet
of the correct size is on a lookaside list, it can be allocated very
quickly and efficiently, however, it cannot then be used as part of any
other size packet. An excess of packets on the lookaside list can be a
cause for the inability to allocate other sizes.
|
(17) Over-limit Lookaside Blocks
|
Total number of memory packets that exist on "lookaside lists" that are
no longer actively used because the SYSGEN parameter PAGED_LAL_SIZE was
lowered. These packets will be available for use again if the SYSGEN
parameter is increased to include them, or if there was a paged pool
shortage and they are reclaimed. If there are no lookaside list packets
on these "over-limit" lists then this line will not appear.
|
#11 |
$ SHOW MEMORY/FILES
System Memory Resources on 22-MAY-2001 19:04:19.67
Swap File Usage (8KB pages): Index (1) Free Size
DISK$ALPHASYS:[SYS48.SYSEXE]SWAPFILE.SYS 1 904 904
DISK$SWAP:[SYS48.SYSEXE]SWAPFILE.SYS;1 2 1048 1048
Total size of all swap files: 1952
Paging File Usage (8KB pages): Index (2) Free Size
DISK$PAGE:[SYS48.SYSEXE]PAGEFILE.SYS;1 253 16888 16888
DISK$ALPHASYS:[SYS48.SYSEXE]PAGEFILE.SYS 254 16888 16888
Total size of all paging files: 33776
Total committed paging file usage: (3) 1964
|
Paging File Usage (in blocks)
Shows the usage of paging and swapping files.
(1) Swap File Usage
|
Number of swap files. Begins with an index value of 1 and increases in
count.
|
(2) Paging File Usage
|
Number of page files. Begins with an index value of 254 and decreases
in count.
|
(3) Total Paging File Usage
|
Total committed page file usage. As in previous releases, more pages
can reside in page-file sections systemwide than would fit into
installed page files.
|
|