Jeff
On Thursday, October 8, 2015, Rob Latham <
robl@mcs.anl.gov> wrote:
On 10/08/2015 08:18 AM, Jeff Hammond wrote:
Nodes and cores are *hardware* concepts. If you need to add hardware
resources to your job, that is a resource manager issue. If you want to
create new MPI processes _that will run on those new nodes/cores_, you
can use MPI_Comm_spawn for that.
As for pausing a job, I'm not sure why you want to do that. Are you
trying to suspect the job until the new hardware resources become available?
Probably not what Wahi has in mind, but back on the old Crays (old vector-era crays, I mean), when checkpoint/restart was an os-level service, the job scheduler used that feature: new job comes in with higher priority, checkpoint the old job. when new job finishes, restart old job.
==rob
On Wed, Oct 7, 2015 at 10:08 PM, wahi <wahi@sci.am <mailto:wahi@sci.am>>
wrote:
Hi Jeff,
Thank you for your reply, I think the MPI_COMM_Spawn is for
generating new processes but I need to add more node or cores after
pausing the job, am I right ?
On 10/08/2015 08:11 AM, Jeff Hammond wrote:
See MPI_Comm_spawn(_multiple).
Jeff
On Wednesday, October 7, 2015, Zhao, Xin
<<mailto:xinzhao3@illinois.edu>xinzhao3@illinois.edu
<mailto:xinzhao3@illinois.edu>> wrote:
Hi Wahi,
Do you mean you want to change number of hosts during one MPI
execution? If so, we think that is not possible.
Xin
________________________________________
From: wahi [wahi@sci.am]
Sent: Wednesday, October 07, 2015 2:43 AM
To: discuss@mpich.org
Subject: [mpich-discuss] Can the MPICH job pause and resumed
Hi,
I would like to know if there is possibility to pause the
MPICH job and
restart it with more node numbers ?
Thanks in advance for any help or suggestion.
Regards,
Wahi
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Jeff Hammond
jeff.science@gmail.com <mailto:jeff.science@gmail.com>
http://jeffhammond.github.io/
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Jeff Hammond
jeff.science@gmail.com <mailto:jeff.science@gmail.com>
http://jeffhammond.github.io/
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Rob Latham
Mathematics and Computer Science Division
Argonne National Lab, IL USA
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