A couple of observations on memory, a maxFilesToCache object takes anwhere
from 6-10K, so 1 million =~ 6-10 Gig. Memory utilized in the mmfsd comes
from either the pagepool, the shared memory segment used by MFTC objects, the
token memory segment used to track MFTC objects, and newer is memory used by
AFM. If the memory resources are in the mmfsd address space then this will
show in the RSS size of the mmfsd. Ignore the VMM size, since the glibc
change awhile back to allocate a heap for each thread VMM has become an
imaginary number for a large multi-threaded application.
There have been some memory leaks fixed in Ganesha that will be in 4.2.3 PTF15
which is available on fixcentral
Jim Doherty
On Thursday, May 9, 2019, 1:25:03 PM EDT, Sven Oehme <oeh...@gmail.com>
wrote:
Unfortunate more complicated :)
The consumption here is an estimate based on 512b inodes, which no newly
created filesystem has as all new default to 4k. So if you have 4k inodes you
could easily need 2x of the estimated value.Then there are extended attributes,
also not added here, etc .So don't take this number as usage, it's really just
a rough estimate.
Sven
On Thu, May 9, 2019, 5:53 PM Achim Rehor <achim.re...@de.ibm.com> wrote:
Sorry for my fast ( and not well thought)answer, before. You obviously are
correct, there is no relation betweenthe setting of maxFilesToCache, and the
fileCacheMem 38359956 k = 11718554* 3352 bytes (inode size 512 + 2840)
usage. it is rather a statement of howmany metadata may fit in the remaining
structures outside the pagepool.this value does not change at all, when you
modify your mFtC setting.
There is a really good presentationby Tomer Perry on the User Group meetings,
referring about memory footprintof GPFS under various conditions.
In your case, you may very well hitthe CES nodes memleak you just pointed out.
Sorry for my hasty reply earlier ;)
Achim
From: Stijn De Weirdt <stijn.dewei...@ugent.be>
To: gpfsug-discuss@spectrumscale.org
Date: 09/05/2019 16:48
Subject: Re: [gpfsug-discuss]advanced filecache math
Sent by: gpfsug-discuss-boun...@spectrumscale.org
seems like we are suffering from
http://www-01.ibm.com/support/docview.wss?uid=isg1IJ12737
as these are ces nodes, we susepcted something wrong the caches, but it
looks like a memleak instead.
sorry for the noise (as usual you find the solution right after sending
the mail ;)
stijn
On 5/9/19 4:38 PM, Stijn De Weirdt wrote:
> hi achim,
>
>> you just misinterpreted the term fileCacheLimit.
>> This is not in byte, but specifies the maxFilesToCache setting:
> i understand that, but how does the fileCacheLimit relate to the
> fileCacheMem number?
>
>
>
> (we have a 32GB pagepool, and mmfsd is using 80GB RES (101 VIRT),so we
> are looking for large numbers that might explain wtf is going on
> (pardon my french ;)
>
> stijn
>
>>
>> UMALLOC limits:
>> bufferDescLimit 40000desired 40000
>> fileCacheLimit 4000 desired 4000 <=== mFtC
>> statCacheLimit 1000 desired 1000 <=== mSC
>> diskAddrBuffLimit 200desired 200
>>
>> # mmfsadm dump config | grep -E "maxFilesToCache|maxStatCache"
>> maxFilesToCache 4000
>> maxStatCache 1000
>>
>> Mit freundlichen Grüßen / Kind regards
>>
>> *Achim Rehor*
>>
>> --------------------------------------------------------------------------------
>> Software Technical Support Specialist AIX/ Emea HPC Support
>> IBM Certified Advanced Technical Expert - Power Systems with AIX
>> TSCC Software Service, Dept. 7922
>> Global Technology Services
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>> Phone: +49-7034-274-7862 IBM Deutschland
>> E-Mail: achim.re...@de.ibm.com Am Weiher 24
>> 65451 Kelsterbach
>> Germany
>>
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>> Geschäftsführung: Martin Hartmann (Vorsitzender), Norbert Janzen,Stefan
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>>
>>
>>
>>
>>
>> From: Stijn De Weirdt <stijn.dewei...@ugent.be>
>> To: gpfsug main discussion list <gpfsug-discuss@spectrumscale.org>
>> Date: 09/05/2019 16:21
>> Subject: [gpfsug-discuss] advanced filecache math
>> Sent by: gpfsug-discuss-boun...@spectrumscale.org
>>
>> --------------------------------------------------------------------------------
>>
>>
>>
>> hi all,
>>
>> we are looking into some memory issues with gpfs 5.0.2.2, andfound
>> following in mmfsadm dump fs:
>>
>> > fileCacheLimit 1000000desired 1000000
>> ...
>> > fileCacheMem 38359956 k = 11718554 * 3352 bytes (inode size 512 +
>> 2840)
>>
>> the limit is 1M (we configured that), however, the fileCacheMemmentions
>> 11.7M?
>>
>> this is also reported right after a mmshutdown/startup.
>>
>> how do these 2 relate (again?)?
>>
>> mnay thanks,
>>
>> stijn
>> _______________________________________________
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>>
>>
>>
>>
>>
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