[Beowulf] shared memory error

Rafael R. Pappalardo rafapa at us.es
Tue Apr 5 02:33:51 PDT 2016

Could you share with us the input file(s)? Which version of GAMESS-US?

On lunes, 4 de abril de 2016 22:29:11 (CEST) Jörg Saßmannshausen wrote:
> Dear all,
> I was wondering whether somebody might be able to shed some light on this
> problem I am having with a chemistry code (GAMESS-US):
> DDI Process 15: semop return an error performing 1 operation(s) on semid
> 98307.
> semop errno=EINVAL.
> This sometimes happens when I need quite a bit of memory for the fortran
> code (1550000000 words). Originally I thought it has to do with the
> hardware I am running it on but meanwhile I found it all over the place,
> i.e. on some older Opterons and on some newer Ivy and Haswell CPUs.
> It is not quite reproducible, unfortunately. A run might work ok for a few
> days and then the problem kicks in and the logfile explodes from around 14
> MB to 17 GB, or it might just work.
> Some system informations: I am running Debian Jessie with gcc / gfortran
> version 4.9.2-10. The nodes have 64 GB of RAM and 16 or 20 cores.  As the
> shared memory default settings in Linux are not suitable for GAMESS (there
> is a note in the documentation), I am using these settings on the 64 GB RAM
> machines:
> kernel.shmmax = 6923000000
> kernel.shmall = 25165824
> kernel.shmmni = 32768
> I got the feeling the problem lies burried in these settings but my
> knowledge here is not sufficient to solve the problem. Could somebody point
> me in the right direction here?
> All the best from London
> Jörg

Dr. Rafael R. Pappalardo
Dept. Química Física, Fac. de Química
Univ. de Sevilla (Spain)

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