[ltt-dev] LTTng-UST vs SystemTap userspace tracing benchmarks

Tom Tromey tromey at redhat.com
Wed Feb 16 10:30:32 EST 2011

>>>>> "Julien" == Julien Desfossez <julien.desfossez at polymtl.ca> writes:

Julien> SystemTap 1.2-5 (from Debian package), hooking on DTrace user-space
Julien> static markup.

The sdt.h stuff has been rewritten at least once since then.  I'd
suggest trying the latest.  I think it probably won't matter for the
flight recorder mode, but it may matter for measuring overhead.

Julien> 0) Baseline : running the program without any instrumentation
Julien> 1) Flight recorder tracing comparison UST vs SystemTap

I'd be interested to also see the numbers when the probes are in place
in the source, but not enabled.  That is, what is the overhead of a
disabled probe?

When doing this with SystemTap it would be interesting to try twice:
once with a semaphore for each probe, and once without.


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