Date: Fri, 23 Jun 1995 01:34:31 -0400 (EDT) From: Charles Henrich <henrich@crh.cl.msu.edu> To: freebsd-hackers@freebsd.org Subject: Poor program load time Message-ID: <199506230534.BAA09033@crh.cl.msu.edu>
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I have very often exprienced cases where I will attempt to run a program (be it
ls or xterm) where for no apparent reason it takes seconds to load and execute.
This is on a P100 w/ 32mb ram and 1gb SCSI disk (but It occurs on all 2.0.5-R
systems).
My guess is the problem is with the merged vm cache code. As my cache is
always full of file data, when I attempt to execute a program there is some
sort of contention while the system determines just what the hell it should
throw out to get me up and running.
AIX has a similar sort of merged cache but program execution is virtually
instantaneous. One thing I've noticed with AIX is that when a program is first
run it is started with a "higher" priority and as time goes on the priority is
lowered. Now, could FreeBSD do the same thing to give "new" processes a kick
in the butt so to the end user response time improves?
Now all the above is based on supposition on a topic I know virtually nothing
about, so If I sound like a rambling idiot please correct me, but explain why
the load times are so damn long some times please!
-Crh
Charles Henrich Michigan State University henrich@crh.cl.msu.edu
http://rs560.msu.edu/~henrich/
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