6.1 responsiveness under heavy (cpu?) load + thread monitoring
freebsd-stable at club-internet.fr
Sat Apr 1 14:34:33 UTC 2006
I have a RELENG_6/AMD64 with an AMD64X2 cpu, 1GB of memory, 512MB swap.
I remarked that when I run 2 simulation program , sometimes, one of them
run one or several of its threads  very slowly, but sometimes, it doesn't
I remarked that is doesn't depend on SMP/UP, ULE/4BSD, i386/AMD64.
It seems to occur also with the kernel stress test under the same conditions
(all of them).
In this case, the mouse is blocked, etc. I tested different kernels, and
recorded the output of sysctl vm .
I increased vm.swap_async_max but this doesn't change the deal /a priori/.
All that didn't occur with a Sempron64. All was slower but the mouse didn't
blocked etc. This was a time ago, I may be wrong.
It seems to be an architecture problem (??).
I can give more quantitative data, but I need help to focus the tests...
 void *interface(void *arg) can be very slow, void *system_trace(void *arg)
can exit during a very long time (terminated ? detached: it should).
 http://ising.podzone.org/vm/vm_amd64.tar.bz2 and others in this directory
PS: does FreeBSD allow monitoring threads of a program in real time ?
I didn't find anything for freebsd.
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