[dtrace-discuss] eliminating drops

[Joel Reymont]

I'm trying to collect function calls in Firefox in the time order.

I want just the XUL library but I must not miss any functions since I  
will be feeding the list to the linker for reordering of symbols.

I collect about 11Gb of function names but I can't manage to eliminate  
drops despite increasing the buffer size and switch rate, e.g.

grep CPU time.order
__ZL15SelectorMatchesR17RuleProcessorDataP13nsCSSSelectordtrace:  
684061 drops on CPU 0
__ZNK19ndtrace: 205307 drops on CPU 0

Should I further increase the buffer size? Any other suggestions?

In reality, I just want the first invocation of each function but I  
think keeping track of calls will take too much memory in DTrace, e.g.  
one associative array for the time order, indexed on timestamp or  
similar, plus another array indexed on the function name.

	Thanks, Joel

---

#pragma D option mangled
#pragma D option switchrate=10hz
#pragma D option bufsize=512m

pid$target:XUL::entry
{
   printf("%s\n", probefunc);
}

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