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HP OpenVMS DCL Dictionary
HP OpenVMS DCL Dictionary
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 a VAX system
or 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.
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(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. Refer to 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.
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(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.
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(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
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(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.
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(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
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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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(11) 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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| #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
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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.
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(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
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(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.
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(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
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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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(11) 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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| #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
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Extended File Cache Statistics Usage
Shows the use of the Extended File Cache Statistics facility on an
Alpha system.
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(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
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(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.
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(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
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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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(11) 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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| #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.
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Physical Memory Usage
Shows the use of physical memory.
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(1) Total
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Number of physical memory pages available for general system use.
Multiport memory pages (existing on some VAX) used for shared memory
global sections, mailboxes, and common event blocks are not included in
this number.
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(2) Free
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Number of pages on the free page list.
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(3) In Use
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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.
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(4) Modified
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Number of pages on the modified page list.
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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.
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Total
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Number of pages on the bad page list.
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Dynamic
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Number of memory errors detected after the system was booted.
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I/O Errors
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Number of errors detected during page fault handling.
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Static
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Number of memory errors detected during boot-time scan.
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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
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