[mvapich-discuss] RMA Put/Get much slower under 2.2b then 2.1 release

[Nenad Vukicevic]

I am attaching a benchmark that shows one-sided Put/Get operations
being almost 100 times slower from the previous release.  Both version
are compiled the same way with -enable-fast=O3, however the same can
be shown for the debugged version.  Note that measurements of
accumulate operations are compatible across these two versions.

>From the attached results you can see that version 2.1 executes 1.4
million operations per second, while 2.2b does only close to 30
thousand operations.

Any idea what might be the cause?

Here are the outputs of the runs:

RUNNING 2.1
nranks = 4
Main table size = 2^18 = 262144 words
Number of updates = 1048576
init(c= 0.0000 w= 0.0000) up(c= 0.7229 w= 0.7300) mil. up/sec= 1.4364
Found 6469 errors in 262144 locations (passed).

RUNNING 2.2b
nranks = 4
Main table size = 2^18 = 262144 words
Number of updates = 1048576
init(c= 0.0000 w= 0.0000) up(c= 15.6167 w= 35.1200) mil. up/sec= 0.0299
Found 6478 errors in 262144 locations (passed).

-- 
Nenad
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