Re: PETSc Debian package switch to lam?
>> Junichi Uekawa <dancer@netfort.gr.jp> writes:
> Myrinet is coming very rapidly, and I think myrinet should be
> considered. Well, that's my personal impression. (We have a cluster
> with myrinet here).
Yup. Look at http://clusters.top500.org/ and play with the database
queries. Some not so large clusters (32 nodes) are using either
Myrinet or Myrinet 2000. The MPI implementation is either MPICH/GM or
SCore. I dunno about GM's freeness. SCore is "almost" there (dunno
about PM), it has some nasty attribution clauses[1] which push it to
the non-free side[2]. Searching on the web I found some benchmarks
which suggests MPICH/GM doesn't perform that well. The SCore
implementation we have (Myrinet, 32bit, 33MHz) achieves 90 MB/s
according to my own benchmarks. The newest one on Myrinet
2000/64bit/33MHz reaches 140 MB/s using the same benchmark. For some
applications this makes sense.
[1] I don't have a problem with attribution clauses. I do have a
problem with those that say that you *must* mention you use someone's
products on your papers. The other problem with SCore's license is that
"you *must* report bugs to RWCP".
[2] this was bad timing on my part: I just read SCore's license, I
didn't know they distributed source, and just last week I was talking
with Real World Computing's chief.
--
Marcelo | "If you put butter and salt on it, it tastes like salty
mmagallo@debian.org | butter."
| -- Popcorn comes to the Discworld
| (Terry Pratchett, Moving Pictures)
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