>I got that response too. When I pressed kernel people for details it turns
>out that they think having hundreds of runnable threads/processes (mostly
>the same thing under Linux) is wasteful. The scheduler is just not
optimised
>for that.
Try out the http://lse.sourceforge.net/scheduling patches. The MQ kernel
scheduler sure can handle this
kind of load :-)
Hubertus Franke
Enterprise Linux Group (Mgr), Linux Technology Center (Member Scalability)
, OS-PIC (Chair)
email: [EMAIL PROTECTED]
(w) 914-945-2003 (fax) 914-945-4425 TL: 862-2003
bert hubert <[EMAIL PROTECTED]>@vger.kernel.org on 06/13/2001 01:31:39 PM
Sent by: [EMAIL PROTECTED]
To: [EMAIL PROTECTED]
cc:
Subject: Re: threading question
On Tue, Jun 12, 2001 at 12:06:40PM -0700, Kip Macy wrote:
> This may sound like flamebait, but its not. Linux threads are basically
> just processes that share the same address space. Their performance is
> measurably worse than it is on most commercial Unixes and FreeBSD.
Thread creation may be a bit slow. But the kludges to provide posix threads
completely from userspace also hurt. Notably, they do not scale over
multiple CPUs.
> They are not, or at least two years ago, were not POSIX compliant
> (they behaved badly with respect to signals). The impoverished
POSIX threads are silly with respect to signals. I do almost all my
programming these days with pthreads and I find that I really do not miss
signals at all.
> from Larry McVoy's home page attributed to Alan Cox illustrates this
> reasonably well: "A computer is a state machine. Threads are for people
> who can't program state machines." Sorry for not being more helpful.
I got that response too. When I pressed kernel people for details it turns
out that they think having hundreds of runnable threads/processes (mostly
the same thing under Linux) is wasteful. The scheduler is just not
optimised
for that.
Regards,
bert
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