HPL residual check failure
Yoon Jae Ho
yoon at bh.kyungpook.ac.kr
Wed Nov 7 23:11:01 PST 2001
I found your e-mail today.
I can't find your system information in your e-mail.
but I guess if you use Myrinet instead of 10/100 LAN. then please check the Cable & Myrinet mpich version.
If you use 10/100 LAN, then I guess your failure for the matrix size 23,000 is related to RAM .
Please check the RAM size & Physical Problems of your Workstations RAM first.
There may be problems in the heat but I think in the normal temperature, Workstation must be endured without fail.
Have a NIce Day.
---------------------------------------------------------------------
Yoon Jae Ho
Economist
POSCO Research Institute
yoon at bh.kyungpook.ac.kr
jhyoon at mail.posri.re.kr
http://ie.korea.ac.kr/~supercom/ Korea Beowulf Supercomputer
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----- Original Message -----
From: 연규정 <kjyoun at netstech.com>
To: <beowulf at beowulf.org>
Sent: Monday, September 03, 2001 9:22 PM
Subject: HPL residual check failure
> Hi
> When I was doing HPL benchmark test using big matrix(bigger than 20,000 ) with many linux server(more than 20), sometimes I got residual check error as attached.
> When I got residual check error, I turned off my linux servers for several hours and then tried again. And usually it worked - I don't know the reason.
> Heat is suspicious. But, is it really heat problem?
> Is there anybody who have experienced similar problem or know the reason?
> please help me.
>
> Thanks in advance!
>
> Keaton
>
>
> HPL result files------------------------------------------------------------
>
> ============================================================================
> T/V N NB P Q Time Gflops
> ----------------------------------------------------------------------------
> W11R2C4 21000 200 6 6 702.80 8.786e+00
> ----------------------------------------------------------------------------
> ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 0.0272768 ...... PASSED
> ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 0.0140749 ...... PASSED
> ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 0.0026585 ...... PASSED
> ============================================================================
> T/V N NB P Q Time Gflops
> ----------------------------------------------------------------------------
> W11R2C4 23000 200 6 6 866.35 9.364e+00
> ----------------------------------------------------------------------------
> ||Ax-b||_oo / ( eps * ||A||_1 * N ) = 3255.3898794 ...... FAILED
> ||Ax-b||_oo / ( eps * ||A||_1 * ||x||_1 ) = 7833.1904572 ...... FAILED
> ||Ax-b||_oo / ( eps * ||A||_oo * ||x||_oo ) = 1364.3123654 ...... FAILED
> ||Ax-b||_oo . . . . . . . . . . . . . . . . . = 0.000049
> ||A||_oo . . . . . . . . . . . . . . . . . . . = 5827.145943
> ||A||_1 . . . . . . . . . . . . . . . . . . . = 5836.795619
> ||x||_oo . . . . . . . . . . . . . . . . . . . = 2.390054
>
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