Date: Sun, 06 Nov 2005 14:30:40 -0600 From: Stephen Montgomery-Smith <stephen@math.missouri.edu> To: freebsd-stable@freebsd.org Subject: kernel: calcru: runtime went backwards Message-ID: <436E67F0.9050409@math.missouri.edu>
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This is on a recent FreeBSD-6.0 stable SMP machine.
As root, run "top -s0". Then, at the same time run this program:
#include <pthread.h>
#define D (1<<10)
void *thread(void *n) {
int i;
double array[D];
for (i=0;i<D;i++) array[i] = i;
}
int main() {
void *i;
pthread_t tid;
while (1) {
pthread_create(&tid,NULL,thread,i);
pthread_join(tid,&i);
}
}
Let this program run for about a minute. Then kill this program.
At this point, I sometimes get some calcru messages from the kernel.
(This is not a contrived situation - this happens much more frequently
than this sample program when I run programs with threaded fftw3 calls -
I suspect that it throws off the cpu times shown by top.)
Stephen
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