Comments (1)
cddr
commented on July 23, 2024
Looking at the code, it seems that a high miss rate is due to lots of time spent in GC. It's defined as overall_signals - overall_samples. It looks like overall_samples is not incremented if ruby is currently collecting garbage.
static void
stackprof_signal_handler(int sig, siginfo_t *sinfo, void *ucontext)
{
_stackprof.overall_signals++;
if (rb_during_gc())
_stackprof.during_gc++, _stackprof.overall_samples++;
else
rb_postponed_job_register_one(0, stackprof_job_handler, 0);
}
Line 427 in 1c0b5bb
from stackprof.
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from stackprof.