Subject: Strange behavior with -j 4
To: None <>
From: Julio Merino <>
List: current-users
Date: 10/27/2002 19:48:38

My i386 box is single-processor, but I wanted to try a with
-j 4 to see if performance incremented a bit (like I used to do in
FreeBSD). Everything went ok until a point where everything started
to go extremely slow.

I checked this with the wmcpuload dock applet, which shows how much
cpu is used in percentage. When the build reached "that" point (I have
the log, can check it later), I saw the cpu most of the time at 0%,
and it was going up for few moments... i.e.., it did 0% -> 30% (a
second) -> 0%. And 0% delayed around 2 - 3 seconds. (replace 30% with
any other value, as sometimes reached 100%). Just to say than before
I noticed this behavior, uptime showed a load average around 10 and
before that point, around 1 or 2...

So I stopped the build and restarted it without -j 4, and using -u.
When it reached the same point as before, wmcpuload said always 100%
cpu load, which I believe. Files are compiled much faster than before.
Now, it's still compiling, and cpu does not get lower than 90% load...

Anybody knows what's going on?


Julio Merino ( <>