Threads and memory management

[j.waldmann]

Here is some more data. It seems the behaviour depends on 32/64 bit arch?

#######################################################

waldmann at master:~/tmp$ uname -a
Linux master 2.6.18-6-amd64 #1 SMP Fri Dec 12 05:49:32 UTC 2008 x86_64
GNU/Linux

waldmann at master:~/tmp$ time ./Par +RTS -N1
496165411
496165411

real    0m22.580s
user    0m22.541s
sys     0m0.040s
waldmann at master:~/tmp$ time ./Par +RTS -N2
496165411
496165411

real    0m21.259s
user    0m26.678s
sys     0m0.164s

########################################################

waldmann at box:~/tmp> uname -a
Linux box 2.6.27.21-0.1-pae #1 SMP 2009-03-31 14:50:44 +0200 i686 i686 i386
GNU/Linux

waldmann at box:~/tmp> time ./Par +RTS -N1
496165411
496165411

real    0m29.802s
user    0m29.670s
sys     0m0.028s
waldmann at box:~/tmp> time ./Par +RTS -N2
496165411
496165411

real    0m11.219s
user    0m14.917s
sys     0m0.164s

###################################################

I don't understand this. The fun thing is that the first machine is 
Intel(R) Xeon(R) CPU           X5365  @ 3.00GHz
while the second is a much cheaper
model name      : Genuine Intel(R) CPU           T2050  @ 1.60GHz


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