benchmark VS coz

I'm aware of one by Google that I used a couple times, but IMO it's better to capture real runtime data from a fully-operational process than to carve out the benchmarkable bits and test them in isolation, so I track information during program testing and print it all to a log instead of using things like that.

If you just want to do some quick benchmarks, you can just use std::chrono::high_resolution_clock::now(). Call it before the code that you are benchmarking and then immediately after. Take them away and you have your duration. If you want to use a proper benchmarking tool then I can totally recommend Google Benchmark. Fantastic benchmarking tool. Honourable mention would be Quick Bench which is an online tool that uses Google Benchmark.

I tried to install google benchmark(https://github.com/google/benchmark) in my ubuntu machine by :

We don't know if it's a lie until we verify it and that's not difficult, you have a quicksort implementation in a couple of languages, you'll need to pass the necessary parameters to show the time needed by a function call to execute to the compiler or interpreter or you may use use a library(like benchmark for C++) and you're good to go.

If you are uncertain about the performance characteristics of a function you should ALWAYS benchmark it. Googles Benchmark library is wonderful for quick micro benchmarks. For more complex things, perhaps look into profiling and then look at invocation counts of copy constructors.

Your compiler may be optimising away your loop, there. I typically use a micro-benchmarking tool for these types of tests. You could try Google Benchmark. It’s available in most OS’ package managers, but pretty easy to build from source if not

C++: C++ has quite a number of benchmarking libraries some of the recent ones involving C++ 20's flexibility. The most notable being Google Bench and UT. C does not have many specific benchmarking libraries, but you can easily integrate C code with C++ benchmarking libraries in order to test the performance of your C code.

But let's take the guesswork out of profilers. Use Coz. It's a causal profiler that performs experiments to determine what code would see the greatest performance improvement of the whole program if made faster. There's a video in the link; I think the best demonstration they had was a program that saw the greatest improvement by optimizing a function that ranked #30 by a sampling profiler.

Coz. It's in a Debian package so you don't have to build it. Watch the video embedded in the page I linked; I;m all about profiling, but the devil is if you're not a statistician, you don't know how to read profiler results.

I think https://github.com/plasma-umass/coz solves most problems related to noise in benchmarks.

Perhaps you're thinking of the coz profiler (https://github.com/plasma-umass/coz)?

I was thinking of doing some kernel profiling, and stumbled upon this interesting repo: https://github.com/plasma-umass/coz

I'm pretty intrigued by the concept, and was wondering if anyone here tried out Coz.

https://github.com/plasma-umass/coz https://youtu.be/7g1Acy5eGbE

Could it be an issue of binary layout? Have a look at the coz profiler which has a rust port.

Idk if you have already heard about it, but causal profiling might be interesting. Basically, by artificially slowing down the rest of the program except for one function one can measure more accurately what kind of speedup the program would get if you speed up this function. There's a great talk somewhere on this github. Someone already made binds for this in rust. But I don't know how useful that really is, as I don't have much experience with profiling