From: Jim Freeze <jim@...>
Date: 2003-04-17T19:45:58+09:00
Subject: Re: Need IO Optimization help

On Thursday, 17 April 2003 at 19:29:16 +0900, David King Landrith wrote:
> In my experience, the fastest way to access files (by far) is mmap.  
> I've written some C extensions to Ruby that use mmap to read files, and 
> they is dramatically faster the versions that I wrote using standard, 
> buffered IO.  All of the stuff I have written is for a specific purpose 
> (e.g., a state machine to read character delimited files).  Is there 
> any generic Ruby Extension that gives provides access within ruby to 
> mmap?
> 
> Following is some code that copied out of I out of one of my C 
> extensions to give you a quick idea of what it takes to read using mmap:
> 
[mmap stuff deleted]

Thanks much. I'll look into this.
I have already gone from a 18% loss to a 15.5% lead
over perl by switching to  rb_io_gets.

Do you think that mmap will get me speeds near cp?


-- 
Jim Freeze
----------
A sine curve goes off to infinity or at least the end of the blackboard
		-- Prof. Steiner