[Bug 1376857] New: poor pmlogconf performance, esp. with derived metrics

[bugzilla@xxxxxxxxxx]

https://bugzilla.redhat.com/show_bug.cgi?id=1376857

            Bug ID: 1376857
           Summary: poor pmlogconf performance, esp. with derived metrics
           Product: Fedora
           Version: rawhide
         Component: pcp
          Assignee: nathans@xxxxxxxxxx
          Reporter: fche@xxxxxxxxxx
        QA Contact: extras-qa@xxxxxxxxxxxxxxxxx
                CC: brolley@xxxxxxxxxx, fche@xxxxxxxxxx, lberk@xxxxxxxxxx,
                    mgoodwin@xxxxxxxxxx, nathans@xxxxxxxxxx,
                    pcp@xxxxxxxxxxx, scox@xxxxxxxxxx



pmlogconf simply takes too long.  The task of probing for some dozens of
metrics should not take *minutes*, but because of the shell-script/awk/pmprobe
based implementation, and because of derived-metrics amplifying traffic
further, it easily does, esp. with busy networks & remote hosts.

For more analysis, see http://www.pcp.io/pipermail/pcp/2016-May/010540.html

Partial improvement patch:

https://sourceware.org/git/gitweb.cgi?p=pcpfans.git;a=commitdiff;h=8a158581ddc58d7f50f53f4688631f8f82a29b1a

But really it should be rewritten in python or something.

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