RE: Test program: DU good Linux bad

BROWN Nick (Nick.BROWN@coe.int)
Thu, 6 May 1999 19:39:29 +0200

> The program creates a pipe and forks off a number of children. Each of
>these children tries to read an int from the pipe, decrement it and write
it
>back into the pipe. When the int goes to zero the program stops and prints
>its results. The times I get for 5000000 iterations are:

This is reproducible (which I guess makes it science !). I tried two
different kernel versions on my Pentium II/233MHz, 48 MB RAM (there's free
RAM in all cases):

#procs -2.0.36- -2.2.2-
2 33.385 22.516
25 57.702 50.944
50 115.616 119.622

This is just a sample... a couple of other tests also showed that 2.0.36 is
slower for (#procs < ~30) but faster thereafter.

Nick Brown, Strasbourg, France (Nick(dot)Brown(at)coe(dot)int)

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