Messages in this thread |  | | Date | Mon, 18 Sep 2000 15:49:42 -0400 (EDT) | From | (John Rafferty Zedlewski) | Subject | Hardware performance counter overflow |
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Hi, I've noticed that there are quite a few hardware performance counter patches (which allow access to things like the Pentium Model Specific Registers for gathering profiling info) floating around, including Rabbit (http://www.scl.ameslab.gov/Projects/Rabbit/), Richard Gooch's patches, and PAPI (very cool and portable, IMHO). But I haven't seen any of these that supports delivering interrupts when counters overflow (the last version of PAPI that I saw provides high-level emulation of this on Linux/x86, but it's not really accurate enough for serious work). Is there any other patch that supports overflows on Linux/x86, or is it work that still needs to be done? Monitoring these overflows is the trick behind large parts of Intel's VTune and SGI's SpeedShop, and I'd love to see a profiler like this come to Linux. Basically, I'm a student and I think it would be an interesting project, but I don't want to re-invent the wheel unnecessarily. Thanks a lot! --JRZ
PS Please CC me at zedlwski@princeton.edu with any replies, if you don't mind.
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