[Nek5000-users] outpost parallel error

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

Hi Paul,
thank for the answer.
I tried both removing the .sch file before each run and using outpost 
instead of outpost2.
Unfortunately none of these solved my problem.
I have checked that outpost works in parallel before the Arpack pdneupd 
subroutine is called, so my guess is that the Arpack subroutine is 
modifying some flags forcing outpost to write the .sch file, only when 
called by 2 or more ranks.
If somebody has further comments, please let me know.
Best,
Giuseppe



On 25/10/2014 20:39, nek5000-users at lists.mcs.anl.gov wrote:
> Hi Giuseppe,
>
> It looks as though you didn't remove the .sch file prior to the start
> of your run?
>
> Nek is designed to not clobber the .sch file because they can contain
> information that might have resulted from very long runs.  The onus
> is thus on the user to manage those files.   The usual nek scripts move
> those files to blah.sch1  if there is already a blah.sch file.
>
> It's possible, however, that something is messed up in the logic of outpost2().
> That rarely gets exercised.   Is there a reason to not use outpost()?
>
> Paul
>
> ________________________________________
> From:nek5000-users-bounces at lists.mcs.anl.gov  [nek5000-users-bounces at lists.mcs.anl.gov] on behalf ofnek5000-users at lists.mcs.anl.gov  [nek5000-users at lists.mcs.anl.gov]
> Sent: Saturday, October 25, 2014 8:58 AM
> To:nek5000-users at lists.mcs.anl.gov
> Subject: [Nek5000-users] outpost parallel error
>
> Dear Neks,
> in the usr file, after doing some manipulations on a known solution
> (loaded from file with load_fld(...)), I save the computed values with a
> call to outpost, like:
>            call outpost2(u1(1,1,1,1),v1(1,1,1,1),
>        &  w1(1,1,1,1),p1(1,1,1,1),
>        &  p1(1,1,1,1),1,'arp')
> While this is working correctly with 1 rank, in parallel it fails,
> returning only the error message:
> schfile:/.../myrun.sch
> then it hangs for a while, with all processes consuming all the cpu time
> until they are killed (so the .sch file is empty).
> Does anybody have an idea on how this could be solved?
> Best,
> Giuseppe
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