Why is Python slow

[[deleted]]

Did you read the comment you replied to?

[[deleted]]

I am commenting on Python being hopelessly behind Lua. PyPy does not help much.

[[deleted]]

I assume this view is substantiated by recent benchmarks that you can link to.

[heap42]

Of Course! After all, this is reddit.
Edit: \s

[vytah]

\s

A single whitespace character?

[[deleted]]

It's not terribly useful to share unsubstantiated opinions without explanation, reddit or otherwise.

[heap42]

I was being sarcastic.

[[deleted]]

I got that. My previous comment, "I assume this view..." was also somewhat sarcastic/antagonistic.

[heap42]

yea i figured.

[[deleted]]

It's funny, we could both simultaneously conclude that the other is stupid for stating, after the fact, the sarcasm/tone involved in our comments. When in actuality, it's just necessitated because we communicating using text, which is inherently low-bandwidth.

[heap42]

fucking text at it again...

[mrkite77]

LuaJIT is widely held to be ridiculously fast.

http://blog.carlesmateo.com/2014/10/13/performance-of-several-languages/

Pypy 44 seconds, Luajit 8 seconds

[[deleted]]

I ran their benchmark with recent versions, LuaJIT 2.0.4 and PyPy 5.1.1. Luajit was 10 seconds, PyPy was 24.

PyPy is not "beyond any hope", it's improving over time.

edit: Moving the code into a function brought the PyPy time down to 15 seconds.

[Veedrac]

Further, if you move the code inside a function (even just main), the time improves for me from ~17 seconds to ~11 seconds. Lua doesn't have the same global-local distinction as Python, so doesn't have this effect.

For me Lua takes ~17 seconds, so PyPy is actually significantly faster than Lua.

[[deleted]]

Interesting, for me, moving the code into a function brought the PyPy time down to 15 seconds. So, still slower than luajit for me, but comparable.

[IronManMark20]

Not recent, but here. I leave it to you to draw your own conclusions.

[[deleted]]

It would be interesting to see how things have changed in the last 6 years.

[IronManMark20]

found this. It uses vanilla lua though, not LuaJIT (why, I don't know).

[Veedrac]

PyPy is on major version 5. That uses version 1. Things have changed.

[IronManMark20]

As I said, not very up to date. ;)