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тАО01-10-2005 05:58 AM
тАО01-10-2005 05:58 AM
simulation job crash, help!
We need to large IC simulation jobs in our linux box. but the jobs always crash the box before it use up all the memory.
I have increased swap space to 6GB after we increase memory to 3GB.
I have check ulimit and memory without any clue.
any suggestions?
Thanks,
Jane
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тАО01-10-2005 06:09 AM
тАО01-10-2005 06:09 AM
Re: simulation job crash, help!
did you see any messages on /var/log/messages regarding your job ? Any message at all ?
What you mean about server crash ? did it hangs ? reboots ? You loose control over you job only ?
we need more information to help you.
Tell us your hardware configuration and linux distribution also.
regards,
xyko
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тАО01-10-2005 06:53 AM
тАО01-10-2005 06:53 AM
Re: simulation job crash, help!
Our IC designer was running his big job there. I did not see any thing abnormal in the /var/log/messages.
But in the spectre( IC simulation).out log file, it complained.
We has increased memory from 1GB to 3GB and swap space to 6GB. still no go.
Running top before the job crash ( the job just quit) only see 2.5gb allocated to the job ( from the size column).
We are using redhat 8.0 on intel dell PC.
Linux della02 2.4.18-14 #1 Wed Sep 4 13:35:50 EDT 2002 i686 i686 i386 GNU/Linux
Fatal error found by spectre at time = 41.6982 ps during transient analysis
`tran'.
Insufficient memory available.
Warning from spectre.
5 warnings suppressed.
Aggregate audit (7:35:26 PM, Thur Jan 6, 2005):
Time used: CPU = 3.37 ks (56m 14.1s), elapsed = 3.46 ks (57m 35.0s), util. =
97.7%.
Virtual memory used = 924 Mbytes.
spectre completes with 1 error, 388629 warnings, and 251654 notices.
spectre terminated prematurely due to fatal error.
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тАО01-10-2005 01:47 PM
тАО01-10-2005 01:47 PM
Re: simulation job crash, help!
You may also need to use a differently-compiled kernel. By default, the latest eratta kernels have the kernel flag 'CONFIG_HIGHMEM4G' set on to support between 1 and 4GB of memory. It's turned off in all but the i686 series of kernel packages in the release set.
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тАО01-10-2005 09:47 PM
тАО01-10-2005 09:47 PM
Re: simulation job crash, help!
Stuart is giving a good idea. verify if your kernel supports bigmem. The command free will give you information to see if your kernel is using the hole RAM.
Another thing you may see is if your job has some issues regarding memory parameters that you may configure at startup like shmmax, shmmni and shmall. I guess you have to look for that kind off information on the software manual.
man sysctl will help you with kernel parameters.
regards,
xyko
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тАО01-11-2005 12:46 AM
тАО01-11-2005 12:46 AM
Re: simulation job crash, help!
This package includes a kernel that has appropriate configuration options
enabled for Pentium III machines with 16 Gigabytes or more of physical memory.
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тАО01-11-2005 06:15 AM
тАО01-11-2005 06:15 AM
Re: simulation job crash, help!
Thanks for the feedbacks.
I have apply rpm package kernel-bibmem to redhat 8. the application make more progress to use swap space. still quit due to the same reason.
I am going to upgrade to WS V3 to see what happen.
Thanks,
Jane