LZO looks cool, but it's unfortunately GPL (Open MPI is BSD). Bummer.
On Apr 4, 2008, at 2:29 PM, Roland Dreier wrote:
Based on some discussion on this list, I integrated a zlib-based
compression
ability into ORTE. Since the launch message sent to the orteds and
the modex
between the application procs are the only places where messages of
any size
are sent, I only implemented compression for those two exchanges.
I have found virtually no benefit to the compression. Essentially,
the
overhead consumed in compression/decompressing the messages pretty
much
balances out any transmission time differences. However, I could
only test
this for 64 nodes, 8ppn, so perhaps there is some benefit at larger
sizes.
A faster compression library might change the balance... eg LZO
(http://www.oberhumer.com/opensource/lzo) might be worth a look
although
I'm not an expert on all the compression libraries that are out there.
- R.
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Jeff Squyres
Cisco Systems
