From: Mark Volkmann <r.mark.volkmann@...>
Date: 2006-01-12T00:16:55+09:00
Subject: Re: thread scheduling

On 1/11/06, Lou Vanek <vanek@acd.net> wrote:
> Mark Volkmann wrote:
>
> > I've search for documentation about whether Ruby thread scheduling
> > uses FIFO or round-robin and can't find anything. It seems to be
> > round-robin. Is that correct?
>
> all threads being equal, it's round robin.
>
> the thread scheduler is called rb_thread_schedule in the eval.c file.
>
> > Is there a way to control the time slice used for each thread running
> > at the same priority?
>
> you would have to change the hard-coded time (integer) values
> in the eval.c file and recompile ruby.

Thanks for the info!  That's some tough code to read. I thought I
could at least find the time slice duration, but I failed. Do you know
which variable/constant holds that?  Is it WAIT_TIME?  That has a
value of (1<<2) which I guess is equal to 4. 4 what? milliseconds?
microseconds?

--
R. Mark Volkmann
Partner, Object Computing, Inc.