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Subject: [hwloc-devel] hwloc_distances as utility?
From: Jiri Hladky (hladky.jiri_at_[hidden])
Date: 2011-07-03 17:55:35


Hi all,

I have come across tests/hwloc_distances test and I believe that it would be
great to convert this into the utility "hwloc-report-instances" published
under utils/ directory. Please let me know what you think about it.

It would take the same input as hwloc-info (read topology from different
formats instead of discovering the topology on the local machine), support
both logical and physical indexes (-l and -p) switch.

I have used stream memory bandwidth benchmark (
http://www.cs.virginia.edu/stream/) in the past to produce the similar
output as tests/hwloc_distances. It was interesting to see that numactl and
kernel scheduler are both using number of hopes instead of memory bandwidth.
On some systems number of hops does not represent memory bandwidth. I have
reported this in BZ 655041

https://bugzilla.redhat.com/show_bug.cgi?id=655041

In any case I believe that hwloc-report-instances would be useful utility.
Please let me know your opinion.

Thanks
Jirka