A fix is available
APAR status
Closed as program error.
Error description
In multithreaded environments, the gprof command displays smaller number of function calls than the actual number. In this example the right number of function calls are 256, however we get numbers like 254 or 255, running in a loop. $ ./xlf.out; gprof | grep sub2 [1] 0.0 0.00 0.00 256 .sub2 [1] <== OK 0.00 0.00 256/256 .sub2 [1] 0.0 0.00 0.00 256 0.00 0.00 .sub2 [1] [86] ._lib_mutex_unlock [92] .monitor [1] .sub2 $ ./xlf.out; gprof | grep sub2 [1] 0.0 0.00 0.00 254 .sub2 [1] <== BAD 0.00 0.00 254/254 .sub2 [1] 0.0 0.00 0.00 254 0.00 0.00 .sub2 [1] [86] ._lib_mutex_unlock [92] .monitor [1] .sub2
Local fix
Problem summary
When using gprof to analyze the gmon.out file generated by a multi threaded process, the gprof might show incorrect number of function calls.
Problem conclusion
Ensure counter increments/decrements are thread-safe.
Temporary fix
Comments
6100-07 - use AIX APAR IV58355 6100-08 - use AIX APAR IV57965 6100-09 - use AIX APAR IV56212 6100-09 - use AIX APAR IV56212 6100-09 - use AIX APAR IV56212 7100-01 - use AIX APAR IV57635 7100-02 - use AIX APAR IV51877 7100-03 - use AIX APAR IV56264 7100-04 - use AIX APAR IV56276
APAR Information
APAR number
IV56264
Reported component name
AIX V7.1
Reported component ID
5765H4000
Reported release
710
Status
CLOSED PER
PE
NoPE
HIPER
NoHIPER
Submitted date
2014-03-05
Closed date
2014-03-05
Last modified date
2016-05-10
APAR is sysrouted FROM one or more of the following:
APAR is sysrouted TO one or more of the following:
Fix information
Fixed component name
AIX V7.1
Fixed component ID
5765H4000
Applicable component levels
R710 PSY U858977
UP14/05/22 I 1000
PTF to Fileset Mapping
U858977 bos.adt.prof 7.1.3.15
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Document Information
Modified date:
10 May 2016