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Interpreting Shark Results

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Interpreting Shark Results

Subject: Interpreting Shark Results
From: Ansgar Esztermann <email@hidden>
Date: Tue, 18 Aug 2009 10:31:43 +0200

Hello everyone,

currently, I am trying to optimize some routines. Using Shark, I noticed that there are lots of cache misses -- an obvious performance problem. But then again, I am unsure how to interpret what Shark tells me. For example, in this case:


		0x1000aea5a		movups   +216(%rsp), %xmm2
0.6%	0.6%	0x1000aea62		dpps     $255, %xmm15, %xmm5
5.9%	5.9%	0x1000aea69		dpps     $255, %xmm15, %xmm2
0.0%	0.0%	0x1000aea70		movaps   %xmm3, %xmm0
		0x1000aea73		leal     (%rcx, %r9), �x
		0x1000aea77		movaps   %xmm4, %xmm6

About a thousand events are recorded at an instruction that does not reference memory in any way. Even the instruction immediately adjacent to it only reference CPU registers. Is there something obvious I am missing?

Thanks a lot,

A.


--
Ansgar Esztermann
DV-Systemadministration
Max-Planck-Institut für biophysikalische Chemie, Abteilung 105

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