[mpich-discuss] Hydra binding questions
Jain, Rohit
Rohit_Jain at mentor.com
Fri Aug 12 16:08:53 CDT 2011
Hi Pavan,
I tried the verbose info on a machine while running 9 parallel processes.
'rr' always shows processmap for all cores, but 'cores' and 'sockets' showing processmap for only 8 cores. How is it binding to cores for more than 8 processes?
Machine has 16 cores available.
topomap: (MACHINE,(NODE,mem_size:75951734784,(SOCKET,(CORE,(THREAD,pid:0),(THREAD,pid:8)),(CORE,(THREAD,pid:2),(THREAD,pid:10)),(CORE,(THREAD,pid:4),(THREAD,pid:12)),(CORE,(THREAD,pid:6),(THREAD,pid:14))),(SOCKET,(CORE,(THREAD,pid:1),(THREAD,pid:9)),(CORE,(THREAD,pid:3),(THREAD,pid:11)),(CORE,(THREAD,pid:5),(THREAD,pid:13)),(CORE,(THREAD,pid:7),(THREAD,pid:15)))))
cores: processmap: (0;2;4;6;1;3;5;7;;;;;;;;)
sockets: processmap: (0;1;2;3;4;5;6;7;;;;;;;;)
rr: processmap: (0;1;2;3;4;5;6;7;8;9;10;11;12;13;14;15)
Regards,
Rohit
-----Original Message-----
From: Pavan Balaji [mailto:balaji at mcs.anl.gov]
Sent: Wednesday, August 10, 2011 3:35 PM
To: Jain, Rohit
Cc: mpich-discuss at mcs.anl.gov
Subject: Re: [mpich-discuss] Hydra binding questions
Hi Rohit,
On 08/10/2011 02:56 PM, Jain, Rohit wrote:
> Okay. Let me know when you have it ready and few instructions on how
> to get it from trunk and use it with 1.4.
The changes have been committed to trunk as of r8871. You can download
the latest nightly snapshot of Hydra from
http://www.mcs.anl.gov/research/projects/mpich2/downloads/tarballs/nightly/hydra/
and build it. It'll give you an mpiexec (and some other utility
executables), that you can use to run your program. You can still
compile your application with mpicc and friends from the 1.4
installation; you just need to use the new mpiexec to run it.
When you pass the -verbose flag, it'll show you both the hardware
topology (labeled as 'topomap') and the process binding information
('processmap'). There might be too much additional information in the
debug output, so you might want to grep for these flags in the output.
-- Pavan
--
Pavan Balaji
http://www.mcs.anl.gov/~balaji
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