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Re: Ready to quit after 25 years... [message #76891 is a reply to message #76821] Fri, 08 July 2011 09:53 Go to previous messageGo to previous message
chris_torrence@NOSPAM is currently offline  chris_torrence@NOSPAM
Messages: 528
Registered: March 2007
Senior Member
Hi Bob,

Thanks for the kind remarks!

Now, regarding the problem with Arg_Present - it turns out to not be a problem with Arg_Present at all. The Profiler introduces a slight overhead when it computes the time spent per iteration and records the information in an internal data structure. For most routines this overhead is negligible compared to the execution time of the routine. However, for very fast routines (like Arg_Present), the overhead is significant. The real problem is that Arg_Present was getting called 15 million times. So what you were really measuring for things like Arg_Present, Obj_Isa, etc. is just the speed of the profiler!

I just made a change to the way the Profiler works. Now, by default it will not include the following routines: ARG_PRESENT, KEYWORD_SET, N_ELEMENTS, OBJ_ISA, OBJ_VALID, PTR_VALID, SIZE. You can still turn on profiling for these routines, but you need to do it explicitly. For example:
PROFILER, /SYSTEM ; turns on profiling for all system routines except the above
PROFILER, 'ARG_PRESENT', /SYSTEM ; also turns it on

Hopefully with this change, your profiling results will no longer be biased towards routines like Arg_Present and N_Elements, and you will be better able to discover the real bottlenecks in your code.

For example, in Haje's case with the Arrow function, the real problem is that he has to call Arrow 1500 times because it doesn't accept array arguments. We're also working on that for IDL 8.2.

Cheers,
Chris
ITTVIS

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