Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good)
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- Subject: Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good)
- From: Sean Conner <sean@...>
- Date: 2014年8月26日 20:02:40 -0400
It was thus said that the Great Coroutines once stated:
> On Tue, Aug 26, 2014 at 4:44 PM, Sean Conner <sean@conman.org> wrote:
>
> > Since the buffer is to be reused, and I know how I'm using the buffer,
> > recvb() reads into the buffer starting at offset 0. It then sets idx to the
> > number of bytes read. buffermeta_byte() uses idx as the length of the
> > "string".
>
> What I was confused about was that returned the byte indexed from
> buf[idx + i - 1] -- this seems incorrect. Shouldn't it just be i - 1
> (up to idx at most?)
Check out str_byte() in lstrlib.c of Lua. I copied that routine.
> > Okay, the names are bad, and it assumes a particular usage. What can I
> > say, it's proof-of-concept code.
> >
> >> Seems like immutable, pooled strings are still winning on speed though :-)
> >
> > Yup.
>
> I would love to know why that is -- if Lua's GC is keeping up with how
> often the recv() (not recvb()) string is unreferenced or it's just
> truly faster to create many many duplicates ~ somehow. Maybe it's
> just a stack vs heap difference -- someone told me strings are
> stack-allocated in Lua but I forget how.
Have you tried the other network stacks? Or are you testing the buffer
code alone?
-spc
- References:
- Re: Pooling of strings is good, Coroutines
- Re: Pooling of strings is good, Axel Kittenberger
- Re: Pooling of strings is good, Coroutines
- Re: Pooling of strings is good, Roberto Ierusalimschy
- Re: Pooling of strings is good, Coroutines
- Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good), Sean Conner
- Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good), Coroutines
- Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good), Coroutines
- Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good), Sean Conner
- Re: Speed of Lua's immutable strings vs buffers (split from Re: Pooling of strings is good), Coroutines