The uncore is a symptom of Intel's failure of imagination in naming all the stuff on the chip that is outside the cores.
IBM (Alex Mericas, in particular) has taken to calling it the "nest". Example: On an AMD chip in the shared L3 cache, the memory controller, and the HT links originate from shared stuff outside any one of the cores. You can have multiple cores looking at the events from these resources, but they'll all be counting the same events, more or less. The "more or less" part is that doing first person measurement, e.g., with PAPI, each process counts only the events that happen while that process is actually running. When counting L3 events, for example, a process will see its own events as well as those caused by whatever else is running concurrently. The difficulty in analyzing this stuff is the reason we've been moving away from 1st person profiling and towards "system wide" modes. Dan Terpstra wrote: > Hmmm... > An awful lot of events with an x.y.z naming structure. This could cause a > combinatorial explosion. Also, what the heck's an UnCore? > - d > > >> -----Original Message----- >> From: stephane eranian [mailto:[EMAIL PROTECTED] >> Sent: Thursday, November 27, 2008 6:12 AM >> To: perfmon2-devel >> Subject: [perfmon2] Intel Core i7 specs available. >> >> Hello, >> >> Just wanted to point out that the Intel Core i7 (Nehalem) specifications >> are now available. >> >> I will be releasing the perfmon (kernel, libpfm, pfmon) support for >> Nehalem >> within the next two weeks. >> >> You can get a feel for it at: >> >> http://download.intel.com/design/processor/manuals/253669.pdf >> >> Lots of interesting things you can do. >> >> ------------------------------------------------------------------------- >> This SF.Net email is sponsored by the Moblin Your Move Developer's >> challenge >> Build the coolest Linux based applications with Moblin SDK & win great >> prizes >> Grand prize is a trip for two to an Open Source event anywhere in the >> world >> http://moblin-contest.org/redirect.php?banner_id=100&url=/ >> _______________________________________________ >> perfmon2-devel mailing list >> perfmon2-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/perfmon2-devel > > > ------------------------------------------------------------------------- > This SF.Net email is sponsored by the Moblin Your Move Developer's challenge > Build the coolest Linux based applications with Moblin SDK & win great prizes > Grand prize is a trip for two to an Open Source event anywhere in the world > http://moblin-contest.org/redirect.php?banner_id=100&url=/ > _______________________________________________ > perfmon2-devel mailing list > perfmon2-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/perfmon2-devel -- Robert J. Fowler Chief Domain Scientist, HPC Renaissance Computing Institute The University of North Carolina at Chapel Hill 100 Europa Dr, Suite 540 Chapel Hill, NC 27517 V: 919.445.9670 F: 919 445.9669 [EMAIL PROTECTED] ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ perfmon2-devel mailing list perfmon2-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/perfmon2-devel
