[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

[Bug-gnubg] OT - Linux performance

From: Jim Segrave
Subject: [Bug-gnubg] OT - Linux performance
Date: Wed, 1 Oct 2003 15:13:38 +0200
User-agent: Mutt/

For the last couple of months, I have been running Linux instead of
FreeBSD on my home laptop - specifically RedHat 9. I have to say, the
performance has been very disappointing and I wonder if I'm simply
setting some sub-optimal configuration or if there's a serious
performance issue in the handling of memory and swap.

The symptoms are simple - I use fvwm set up to give me 8 desktops. The
machine has 128Mb of Ram and a 700Mhz processor. When I have for
example, gnubg building in an xterm on one desktop, Opera (or Mozilla,
Konqueror or Galeon) full screen in another desktop and mail and
perhaps another xterm or two in a third, then switching between
desktops is painfully slow - 30 seconds or more while the browser
reloads from/is written out to swap, 15 seconds or more when moving
from the compile desktop to the mail reader one. Looking with top, I
see generally that there's 100 to 125Mb of swap in use and that
current memory is quite full.

Under FreeBSD, this simply doesn't happen. The main differences I see
are that little gets put into swap and that X has a size of about 30Mb
with FreeBSD, 90+ Mb with Linux. It is not possible to run two gnubg's
simultaneously under Linux, the disc never stops running unless I
reduce the cache size to under 100,000, even then it's marginal. 

(a minor nit - the evaluation speed is 7600/sec under FreeBSD, gcc
3.2, -O3 and about 7200~7300 under Linux, which I as I recall, can't
check as I've rebooted into FreeBSD and it can't read ext3fs) is gcc
3.3, also using -O3.

I know there are several Linux users out there - has anyone else seen
similar behaviour where it seems to always be swapping active
processes out to disc and pulling them back again randomly?

Jim Segrave           address@hidden

reply via email to

[Prev in Thread] Current Thread [Next in Thread]