https://bugzilla.redhat.com/show_bug.cgi?id=1380048
Bug ID: 1380048
Summary: pmlogger sends PROFILE PDU unnecessarily every fetch
Product: Fedora
Version: rawhide
Component: pcp
Severity: low
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
CC: [email protected], [email protected], [email protected],
[email protected], [email protected],
[email protected], [email protected]
Came across this while investigating bug #1345821.
When using a pmlogger configuration file that identifies individual instances
to be fetched, pmlogger runs profile-manipulation operations at every fetch,
even if redundant (since the indom profile selection hasn't changed since the
last fetch). This wastes CPU & network resources.
% cat foo.conf
log mandatory on 1 sec { kernel.all.load ["1 minute"] proc.psinfo.tgid
[10156] }
% rm FOO.* ; pmlogger -Dpdu -r -l / -T 10sec -c foo.conf FOO
[...steady state...]
[30654]pmXmitPDU: PROFILE fd=3 len=68
000: 44 7002 0 0 0 2000000 0 900c000
008: 1000000 1000000 0 200000f 1000000 1000000 0 ac270000
016: 1000000
[30654]pmXmitPDU: FETCH fd=3 len=36
000: 24 7003 0 0 0 0 2000000 8000f
008: 2960c000
[30654]pmGetPDU: RESULT fd=3 len=72 from=0
000: 48 7001 0 c8dbeb57 8ae80700 2000000 8000f 1000000
008: 1000000 1000000 10000000 2960c000 1000000 0 ac270000 ac270000
016: 8000004 713d8a3e
pmResult dump from 0x558e08157890 timestamp: 1475075016.518282 11:03:36.518
numpmid: 2
60.2.0 (kernel.all.load): numval: 1 valfmt: 1 vlist[]:
inst [1 or "1 minute"] value 0.27000001
3.24.41 (proc.psinfo.tgid): numval: 1 valfmt: 0 vlist[]:
inst [10156 or "010156 /bin/zsh"] value 10156
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