Re: SMP stall on process creation

On Sat, Dec 16, 2000 at 03:34:14PM -0600, Tony Mantler wrote:

At 3:00 PM -0600 12/16/2000, Daniel Jacobowitz wrote:

quoted

I've been using a dual G4/500 with the linuxppc_2_5 tree for a couple weeks
now, and having all sorts of strange problems.  While trying to debug one
(console corruption on select, and sometimes on boot), I discovered
something very interesting.

I ran, in zsh, this command:
% time (for i in {1..100}; do /bin/echo -n; done)

on several machines.  On an old 604e/200:
 0.52s user 1.25s system 100% cpu 1.759 total

Just ran this on my 9600/200mp, 2.4.0-test11 (linux-pmac-devel, not
terribly current). time says:
 0.84s user 2.63s system 100% cpu 3.466 total

That's kind of upsetting right there :)

If I can figure out how to do profiling I'll try to track this down.

Dan

/--------------------------------\  /--------------------------------\
|       Daniel Jacobowitz        |__|        SCS Class of 2002       |
|   Debian GNU/Linux Developer    __    Carnegie Mellon University   |
|         dan@debian.org         |  |       dmj+@andrew.cmu.edu      |
\--------------------------------/  \--------------------------------/

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