On 12/10/16 02:03, Dave Love wrote:

> For what it's worth, I was misled when I investigated originally by
> counting calls of open and not openat, which is what hwloc uses.

strace -c can be very handy to give you a quick insight into which
system calls are taking the most time (either in a process run from
strace or attaching to a running one).

All the best,
 Christopher Samuel        Senior Systems Administrator
 VLSCI - Victorian Life Sciences Computation Initiative
 Email: sam...@unimelb.edu.au Phone: +61 (0)3 903 55545
 http://www.vlsci.org.au/      http://twitter.com/vlsci
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