New sub-profiler Branch

Michael Schroeder mls at
Fri Sep 2 19:17:45 UTC 2011

Hi Parrot-Dev,

cotto asked me to write a bit about the sub-profiler branch.

Some background: I wrote it to profile Rakudo's setting compilation.
I first tried parrot's current profiling support, but found
out that it slowes down parrot too much, as it writes a line
for every op and every context change instead of incrementing
internal counters.

So I hacked together my own little profiling runcore. It directly
writes kcachegrind ready data to stderr. Instead of doing it
right I patched the "slow" runcore, so "-R slow" will turn on

It curently both counts ops and ticks, for ticks it uses
the hardware-dependant Intel/Amd Time Stamp Counter.

I spent a bit of time to get the callcontext changes right, so
it should handle exceptions/continuations/tailcalls.

The code wasn't meant to be seen by the public in the current
state, so please be kind. I got pressurized to release it so
early ;-)


Michael Schroeder                                   mls at
SUSE LINUX Products GmbH,  GF Jeff Hawn, HRB 16746 AG Nuernberg

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