Hi Gilbert,
Checksums are turned off by default. If you need checksums to be activated
add "-mca pml csum" to the mpirun command line.
Checksums are enabled only for inter-node communication. Intra-node
communication is typically over shared memory and hence checksum is disabled
for this case.
If you have built a debug version of Open MPI (--enable-debug), you can see
the checksum output by appending "-mca pml_base_verbose 5" to your command
line.
If you are interested in the relevant code it is located here -
ompi/mca/pml/csum
--Nysal
On Tue, Aug 31, 2010 at 1:22 PM, Gilbert Grosdidier <grodid_at_[hidden]>wrote:
> Bonjour,
>>
>> I'm not sure I understand how to trigger CHECKSUM use
>> inside of OpenMPI 1.4.1 (after digging in the FAQs, I got not
>> explanations, sorry):
>>
>> - Is checksuming activated by default and embedded automatically
>> within the Send/Recv pair mechanism, please ?
>> - If not, which MCA param(S) should I set to activate it ?
>> - Is there a time penalty for using it, please ?
>>
>> Thanks in advance for any help.
>>
>> --
>> Regards, Gilbert.
>>
>>
>>
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