Re: Why nobody talks about Lua

[Doug Rogers <doug.rogers@...>]

Florian Weimer wrote:
>>> Last time I looked at Python the interpreter used a single lock...
>> It's worse than that. Python's GIL is implemented so badly that you often
>> get worse performance by adding processors. http://blip.tv/file/2232410
> I think this has been fixed. See
> <http://mail.python.org/pipermail/python-dev/2009-October/093321.html>

After reading far too many of the posts in that thread, I finally came
to this conclusion: They've cleaned up the lock itself, but it's still a
single lock (like Lua's lua_lock() macro). The speed-ups reported here:

http://mail.python.org/pipermail/python-dev/2009-October/093375.html

are comparisons against the older implementation of the GIL (Global
Interpreter Lock, if you wondered), not against a single-threaded result.

So there's no performance gain with the threading (like there is with
luaproc when properly configured), but at least they can have efficient
blocking IO calls without blocking the application. That's something
that base Lua does not have.

Doug

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