[Nek5000-users] Run nek5000 in BlueGene supercalculator (IBM compiler)

[nek5000-users at lists.mcs.anl.gov]

Hello,

  I recently moved my computations to the blue-gene server of
IDRIS. I had to make the following modifications to make the code
run on this server:

1. Change the compiler settings. A page containing the details
of the various compilers are given on IDRIS website.

2. There were some issues with the sub-block submission. Sometimes the
the computations hung displaying "permission denied". So I was advised
to use compute blocks in multiple of 64.

3. Can you check which step of your code gives NaN? Is it because of
an error in reading any file? In my simulations, apparently, "load_fld'
subroutine was causing a problem so I used an alternate method to read
the files.

Hope these help.

N.

On Thursday 23 March 2017 08:32 PM, nek5000-users at lists.mcs.anl.gov wrote:
> Hi,
>
> I have trouble running Nek in BlueGene in IDRIS, French national supercalculator: the compilation show no error, but the output give NaN before the time loop start. I looked in the internet and I found 1 person ask almost the same question 4 years ago (In my case the compilation was fine), but I can't find the answear.
>
> Are there anyone ran Nek5000 in IDRIS can share their experience?
>
> Thank you guy,
>
>
>
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