[mvapich-discuss] Diagnosing Slow MVAPICH2 Startup

[Thompson, Matt (GSFC-610.1)[SCIENCE SYSTEMS AND APPLICATIONS INC]]

On 01/12/2016 10:03 AM, Panda, Dhabaleswar wrote:
> Hi Matt,
>
> Thanks for your note. We will take a look at the ZiaTest to see what could be going-on here. At a first glance,
> you should not run  MVAPICH2 with MV2_USE_SHMEM_COLL=0?  There are many optimized collectives which are disabled by making this parameter=0. Have you run the test without setting this parameter=0? Just use the
> default version with affinity=0.
>

DK,

Yes, the 2.2b_bb is just MV2_ENABLE_AFFINITY=0. I only tried the other 
one because someone else had reported a startup slowdown with it. It was 
dartboard-throwing.

Matt

PS: I really hope this goes through well. On my box, the last messages I 
sent came back as some base64 nonsense with no subject. Maybe my mailing 
list subscription is screwed up...?

-- 
Matt Thompson, SSAI, Sr Scientific Programmer/Analyst
NASA GSFC,    Global Modeling and Assimilation Office
Code 610.1,  8800 Greenbelt Rd,  Greenbelt,  MD 20771
Phone: 301-614-6712                 Fax: 301-614-6246
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