On Fri, Nov 06, 2009 at 02:44:22PM +0000, Joel Reymont wrote:
> 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.
This is custom-fit for an aggregation. Try:
pid$target:library::entry
{
@a[probefunc] = min(timestamp);
}
The aggregation will automatically only keep one record per function per CPU,
which should significantly reduce the data traffic.
Cheers,
- jonathan
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