9 ms·
Which profilers in particular are you referring to because I've always thought that Callgrind is a profiler? perf?
by dennis_moore 2y ago
Which profilers in particular are you referring to because I've always thought that Callgrind is a profiler? perf?
- rwmj 2y agoperf on the whole system, with the whole software stack compiled with stack pointers, flamegraphs for visualisation, is an essential starting point for understanding real world performance problems.
- Sesse__ 2y agoperf or Intel VTune are the two standard choices AFAIK. Both have a certain learning curve, both are extremely capable in the right hands. (Well, on macOS you're pretty much locked to using Instruments; I don't know if Callgrind works there but would suspect it's an uphill battle.) Callgrind is a CPU simulator that can output a profile of that simulation. I guess it's semantics whether you want to call that a profiler or not, but my point is that you don't need a simulator+profiler combo when you can just use a profiler on its own. (There are exceptions where the determinism of Callgrind can be useful, like if you're trying to benchmark a really tiny change and are fine with the bias from the simulation diverging from reality, or if you explicitly care about call count instead of time spent.)