What is reason causeing linpack failed?

=?gb2312?B?194gueLPyA==?= zouguangxian at hotmail.com
Fri Aug 31 22:16:23 PDT 2001



>From: Craig Tierney <ctierney at hpti.com>
>To: ?? ???? <zouguangxian at hotmail.com>
>CC: beowulf at beowulf.org
>Subject: Re: What is reason causeing linpack failed?
>Date: Fri, 31 Aug 2001 10:39:03 -0600
>
>I have had this happen when I installed bad memory
:)first ,thank you for your reply.
but can you teach how to check whether the memory can work well?
if I decrese the N to 3000 (do not test other number,such as 5000,etc)
it can work properly.do you have any other advice?
thanks .:)

>into the machine.  Actually, it was either bad memory
>or a bad simm slot on the motherboard, but it did cause
>the job to fail.  Removing the memory fixed the problem.
>
>There could be other reasons as well.
>
>Craig
>
>
> > Hi,
> >   I have 1G memory .
> >   then i use linpack such as"mpirun -np 1 xhpl".In the HPL.dat ,P=1 and 
Q=1
> > and N=10000,but it failed!
> >   following is the information :
> >   T/V      N      NB   P   Q      Time      Gflops
> >   w11c2c4  10000  60  1    1      1251.33   5.329e-01
> > ||Ax-b||_oo/(eps*||A||_1*N    )=79855925.9134882......Failed
> > ||Ax-b||_oo/(eps*||A||_1*||x||_1)=15458564.8357315.....Failed
> > ||Ax-b||_oo/(eps*||A||_oo*||x||_oo)=4114482.8342714......Failed
> > ||Ax-b||__oo....................= 0.226798
> > ||A||_oo.......................=2561.554752
> > ||A||_1........................=2558.129237
> > ||x||_oo........................=19.382542
> > ||x||_1........................ =43356.215115
> > ==============================================================
> > finished   1 tests withe the following results:
> >            0 tests complested and passed residual checks,
> >            1 tests completed and failed residual checks,
> >            0 tests skipped because of illegal input values.
> > --------------------------------------------------------------
> > end of tests.
> > ==============================================================
> > what is the matter?
> > where can i find a guide for linpack?
> >
> >
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> >
> >
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>--
>Craig Tierney (ctierney at hpti.com)


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