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тАО05-13-2008 04:22 AM
тАО05-13-2008 04:22 AM
XFC and memory management
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тАО05-13-2008 04:31 AM
тАО05-13-2008 04:31 AM
Re: XFC and memory management
Tested it on 7.3.
Workstation with 256 MB. VCC_MAX on -1 thus 128 MB is the max size.
Allocated 200 MB and made it dirty.
Again and again. At the end the pagefile was full but XFC still used 12 MB allocated(started the test with 77 MB).
BTW : I ran the malloc again for 5 MB and the system went into hang.
Wim
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тАО05-13-2008 04:40 AM
тАО05-13-2008 04:40 AM
Re: XFC and memory management
I guess you know there is the sda extension xfc
$ ana/sys
xfc
help
and
xfc sh file/brief
xfc show memory(/verify)
xfc sh summary/stat
and similar commands regularly may help monitor this.
This may vary with the patches applied on your system.
Regards
Gerard
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тАО05-13-2008 04:47 AM
тАО05-13-2008 04:47 AM
Re: XFC and memory management
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тАО05-13-2008 04:48 AM
тАО05-13-2008 04:48 AM
Re: XFC and memory management
Wim
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тАО05-13-2008 04:56 AM
тАО05-13-2008 04:56 AM
Re: XFC and memory management
DEC AXPVMS VMS732_XFC V4.0 Patch Install 10-SEP-2007 20:19:07
$ ana/sys
OpenVMS (TM) system analyzer
SDA> xfc show sum
XFC Summary (current time 13-MAY-2008 05:55:37.58)
--------------------------------------------------
Extended File Cache V1.0 (Mar 8 2007 11:18:39)
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тАО05-13-2008 05:17 AM
тАО05-13-2008 05:17 AM
Re: XFC and memory management
The releases notes say, among other things
The most recent patch is : VMS732_XFC-V0400
5.2 Problems addressed in this kit
5.2.1 Limit the Maximum Number of Closed Files Retained in
Cache
5.2.1.1 Problem Description:
Excessive use of non-paged pool by XFC closed files could
lead to non-paged pool allocation failures and bugchecks.
The maximum number of closed files that XFC will retain
in the cache is now limited so that XFC will use no more
than one half of the original size of non-paged pool (the
SYSGEN parameter NPAGEDYN). This value will be
approximately 1500 files per megabyte of non-paged pool.
For example, if the SYSGEN parameter NPAGEDYN is
30,000,000 then then XFC will retain no more than about
45,000 closed files in the cache.
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тАО05-13-2008 05:58 AM
тАО05-13-2008 05:58 AM
Re: XFC and memory management
Also : in VMS 7.3 doc I read
$ RUN SYS$SYSTEM:SYSMAN
SYSMAN> RESERVED_MEMORY SHOW VCC$MIN_CACHE_SIZE /NOGLOBAL_SECTION
should return the minimum size of the VCC. But not on my 7.3 system.
Wim
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тАО05-13-2008 06:08 AM
тАО05-13-2008 06:08 AM
Re: XFC and memory management
Wim
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тАО05-13-2008 06:10 AM
тАО05-13-2008 06:10 AM
Re: XFC and memory management
SDA> XFC SHOW MEM
[ . . . ]
Boottime Maximum Cache Size : 402653184 ( 384.0 MB)
Current Maximum Cache Size : 402653184 ( 384.0 MB)
Total Allocated Cache Memory : 396904832 ( 378.5 MB) Peak: 397094784 ( 378.7 MB)
Minimum cache size : 8052736 ( 7.7 MB)
[ . . . ]