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тАО03-06-2002 10:14 PM
тАО03-06-2002 10:14 PM
I understand the maximum setting for this parameter is approximately 1.9GB for 32 bit applications & this determines the maximum data segment size of a process. On our system there is an application process that wants to grab the maximum (ie 1.8-1.9gb) amount of memory. However even though I have configured maxdsiz to its stated maximum, the process still only grabs about 800-900MB of memory. These are figures that I have obtained from ps & glance (eg vsz, rss & also virtual memory from the gpm processes window.)
Is there anything else (eg other kernel parameters) from an OS perspective that can influence how much memory the process grabs. The box is physically configured with 4GB of RAM & there is consistently about 1.5-2GB free.
Previously the process did manage to grab about 1.6gb of memory for a short period of time. But I have no idea why it is now only using 800-900mb.
I have talked with the application people & they assure me they have configured all the necessary parameters within the application.
Thanks for your help.
Cheers Con.
Solved! Go to Solution.
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тАО03-06-2002 10:36 PM
тАО03-06-2002 10:36 PM
Re: maxdsiz paramter setting
my $0.02
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тАО03-07-2002 03:02 AM
тАО03-07-2002 03:02 AM
Re: maxdsiz paramter setting
For more information have a read of the process management white paper on your system at /usr/share/doc/proc_mgt.txt, in particular the section titled "Handling maxdsiz with EXEC_MAGIC"
Regards,
Steve
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тАО03-07-2002 02:13 PM
тАО03-07-2002 02:13 PM
Re: maxdsiz paramter setting
Thanks for the help.
Cheers
Con
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тАО03-07-2002 02:24 PM
тАО03-07-2002 02:24 PM
Re: maxdsiz paramter setting
i.e.
On the heap, you might have 1GB,30kb,800MB.
That little 30kb chunk in the middle limits you. It's just a crapshoot as to when that big a chunk is available.
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тАО03-07-2002 02:31 PM
тАО03-07-2002 02:31 PM
Re: maxdsiz paramter setting
Thanks for the help.
Cheers
Con
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тАО03-07-2002 02:39 PM
тАО03-07-2002 02:39 PM
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тАО03-07-2002 02:47 PM
тАО03-07-2002 02:47 PM
Re: maxdsiz paramter setting
Cheers
Con
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тАО03-07-2002 05:49 PM
тАО03-07-2002 05:49 PM
Re: maxdsiz paramter setting
Bill Hassell, sysadmin
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тАО03-12-2002 06:36 PM
тАО03-12-2002 06:36 PM
Re: maxdsiz paramter setting
I'm hoping for a bit more help in understanding this. I have determined using the chatr command that the executable for this process has been compiled with the EXEC_MAGIC flag ie the output is saying "normal executable".
I assume then that the process should theoretically be able to grab more than 1GB of memory - however the vsz field in ps & glance "virtual memory" are both consistently reporting around 900MB.
Clay made mention of this in his reply - is this because the memory has to be available in a contiguous chunk across the first 2 Quadrants?? I have read the proc_mgt paper but am still not clear on exactly why the process can't access this additional memory. As before System has 4GB of Phys Mem & there is consistently 1.5GB free.
Thanks again.
Cheers
Con