HPL residual check failure

Yoon Jae Ho yoon at bh.kyungpook.ac.kr
Thu Nov 8 02:11:01 EST 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
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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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