Christoph Hellwig wrote:
On Thu, Dec 22, 2005 at 10:37:56AM -0500, William Cohen wrote:
Both OProfile and PAPI are open source and could use such an performance
monitoring interface.
One of the problems right now is there is a patchwork of performance
monitoring support. Each instrumentation system has its own set of
drivers/patches. Few have support integrated into the kernel, e.g.
OProfile. However, the OProfile driver provides only a subset of the
performance monitoring support, system-wide sampling. The OProfile
driver doesn't allow per-thread monitoring or stopwatch style
measurement, which can be very useful for some performance monitoring
applications.
What about improving oprofile then? Unlike the vtune or perfoman people
the oprofile authors have shown they actually are able to design sensible
interfaces, and oprofile has broad plattform support over most support
architectures.
At what point would adding interfaces to OProfile turn it into perfmon?
Some of the additions like per-thread monitoring would require signicant
changes in the kernel that perfmon already implements. The IA64 OProfile
already uses the perfmon support in the kernel.
Perfmon2 has support for ia64, p6, pentium4, x86_64, ppc, and mips, so
there is multiple architectures support. OProfile currently supports
more architectures: alpha, arm, i386 (p6/pentium4/athlon), ia64,
mips, ppc, ppc64, x86-64, and a fall-back timer mechanisms.
-Will
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