[Scummvm-devel] Slowdowns in SCI and SAGA

[yotam barnoy]

>>so 48.69 + 15.21 = 63.9 % for code clearly associated to the OPL
emulation. Hmm... still this list is somewhat surprising to me. For example,
why does it list CLIP<int> ? The profiler shouldn't >>really be seeing this
template, it should be fully inlined. What optimization level do you use?

Good call. I use -O0 optimization when profiling. I'm kind of new to it, and
thought it was important to keep minimal optimization like in debugging. I
could redo it with -O3 (our usual optimization), but just assume that
instead of the time being spent on CLIP, it'll be in the calling procedure
ie. CALC_CH.

>>But the real bummer seems to be the 12.83% time spent in
 OSystem_PSP::unlockMutex. I wonder if that's the mixer mutex, and it's
stalling because of lock contention.

Here's the detailing of where that 12% goes:

                0.00    0.67     935/9608
DefaultTimerManager::handler() [54]
                0.01    5.87    8188/9608
Sci::SfxPlayer::player_timer_callback(void*) [18]
[12]    12.9    0.02    6.89    9608         Common::StackLock::~StackLock()
[12]
                0.02    6.87    9608/9608        Common::StackLock::unlock()
[13]

player_timer_callback is stalling on the lock.

Yotam
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