On Sat, Feb 24, 2018 at 5:05 AM, Steven D'Aprano <steve+comp.lang.pyt...@pearwood.info> wrote: > But guess what? The benchmarks are flawed. The performance of real-world > Julia code doesn't match the performance of the benchmarks. > > "What’s disappointing is the striking difference between > the claimed performance and the observed one. For example, > a trivial hello world program in Julia runs ~27x slower > than Python’s version and ~187x slower than the one in C." > > http://zverovich.net/2016/05/13/giving-up-on-julia.html > > Admittedly "Hello World" is not what *I* would call a real world program, > but that's just an illustration of the discrepancy between the > performance in artificial benchmarks and the performance in useful code.
No, but Hello World is a good test of application startup time. (A null program doesn't always test everything, and doesn't look very good either.) If Hello World takes half a second to run, you have a language that is terrible for short scripts or command-line tools. That doesn't mean it's a "slow language" necessarily - nor even a slow interpreter, which is what you're actually testing - but it does mean that, well... rosuav@sikorsky:~$ time pypy -c 'print("Hello, world!")' Hello, world! real 0m0.429s user 0m0.036s sys 0m0.032s rosuav@sikorsky:~$ time python -c 'print("Hello, world!")' Hello, world! real 0m0.024s user 0m0.016s sys 0m0.008s ... CPython does have its place still. Or maybe... rosuav@sikorsky:~$ time pypy -c 'print("Hello, world!")' Hello, world! real 0m0.050s user 0m0.016s sys 0m0.032s rosuav@sikorsky:~$ time python -c 'print("Hello, world!")' Hello, world! real 0m0.022s user 0m0.016s sys 0m0.004s ... that PyPy doesn't live in my disk cache the way CPython does. :) PyPy is still slower than CPython for startup time, but not THAT much slower. However, if you DO have something that has a ton of startup overhead, you need to know about it. (Interestingly, I was actually able to compile and run a C hello-world in comparable time to PyPy, once the cache was warmed up. Curious. I expected that to be slower. Once again, it proves that intuition can be extremely wrong.) In terms of "which language is faster?", real-world code is both the ONLY way to measure, and a completely unfair comparison. Life is tough. ChrisA -- https://mail.python.org/mailman/listinfo/python-list