[Nek5000-users] MPI-IO in Nek
nek5000-users at lists.mcs.anl.gov
nek5000-users at lists.mcs.anl.gov
Sat Oct 19 12:49:37 CDT 2013
Also, I asked this specifically because my largest job using 8192 tasks was
killed at the first IO-time due to being out of memory although I was using
the .f000 format (either when every processor was outputting or 64 of them)
. Any ideas as to why that might have happened?
Hesam
From: nek5000-users-bounces at lists.mcs.anl.gov
[mailto:nek5000-users-bounces at lists.mcs.anl.gov] On Behalf Of
nek5000-users at lists.mcs.anl.gov
Sent: Saturday, October 19, 2013 12:18 PM
To: nek5000-users at lists.mcs.anl.gov
Subject: [Nek5000-users] MPI-IO in Nek
Hi Neks
After reading the following post, the inherent differences b/w .fld and
.f000 files became somehow clear to me. However, I have a few questions:
https://lists.mcs.anl.gov/mailman/htdig/nek5000-users/2013-June/002147.html
1) Is this correct that compiling with MPI-IO only requires adding this
flag in makenek: PPLIST="MPIIO" ? or is there anything else I need to do?
2) I noticed that if you do not add the above flag but set param(66)
and param(67) in usrdat2 to 6 or -6 , it does generate .f000 files. I
assume it implicitly used MPIIO, right?
3) If I use several directories for outputting multiple files (by say
setting p65=-64 in the .rea file), how can I restart from those multiple
files associated with a single checkpoint in the *.rea* file?
Thanks a lot for your help
Best,
Hesam
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