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Subject: Re: [OMPI devel] Change in OPAL / OMPI DPM system time during MPI_INIT
From: David Singleton (David.Singleton_at_[hidden])
Date: 2010-11-22 15:06:14


On 11/23/2010 06:47 AM, Barrett, Brian W wrote:
> Short answer: we need the "extra" decrement at the end of MPI init.
>
> Long answer: Ok, so I was somewhat wrong :).
>
> .... (surprised this didn't show up in testing).

Confirmed with our basic pingpong test:

vayu2:~/MPI > mpirun -n 2 ./pp142 | head -4
                       | Best | Average | Worst | Streaming
       n (test/loop) | usec MB/s | usec MB/s | usec MB/s | ( average, worst)
       1 ( 64/1100) | 0.3 23.56 | 0.4 19.69 | 0.6 14.24 | ( 0.4, 0.5)
       2 ( 64/1100) | 0.3 46.93 | 0.4 39.43 | 0.5 29.36 | ( 0.4, 0.5)

vayu2:~/MPI > mpirun -n 2 ./pp143 | head -4
                       | Best | Average | Worst | Streaming
       n (test/loop) | usec MB/s | usec MB/s | usec MB/s | ( average, worst)
       1 ( 64/1100) | 0.5 16.84 | 0.6 13.72 | 0.8 9.93 | ( 0.6, 0.8)
       2 ( 64/1100) | 0.5 32.93 | 0.6 26.97 | 0.8 20.01 | ( 0.6, 0.8)

David