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Profiling Apache using VTune

rohamsameni
Beginner
‎07-07-2011 02:55 PM
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I tried to create a call graph of apache server using vtune, but the graph does not match the execution path I traced using "gdb". Basically it misses some of the function calls after main(). My assumption is that maybe it has something to do with the multi-threading architecture of Apache. Anyone has an idea what's the reason behind it? How can I fix it?
Thanks
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Peter_W_Intel
Employee
‎07-07-2011 10:52 PM
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Did you talk about VTune Amplifier XE 2011 XE? Or old product VTune Performance Analyzer?

VTune AmplifierXE captures samples with statistical call stack info. It meansifthe callee ran shortly - so there is no sample captured, and no caller info recorded. (In other word, VTune Amplifier XE provides call graphinfo - onlybut only callees are hot functions)

VTune Performance Analyzer's call graph will do FULL instrumentation of your binaries, so function call will not be missed.

Regards, Peter

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