Con Kolivas <ckolivas@yahoo.com.au> wrote:
>
> interestingly dbench_load wouldnt give me a number because dbench never
> quite started - a whole swag of processes visible but not doing anything
Signal problems...
What dbench is doing is:
- Install a SIGCONT handler
- fork N times, children drop into a pause()
- parent does kill(0, SIGCONT);
It appears that the SIGCONT is not causing the children to drop out of the
pause().
Changing it to SIGINT makes it work.
The tarball is at http://samba.org/ftp/tridge/dbench/dbench-2.0.tar.gz
Here's the relevant snippet:
static double create_procs(int nprocs, void (*fn)(struct child_struct * ))
{
int i, status;
int synccount;
signal(SIGCONT, sigcont);
start_timer();
synccount = 0;
if (nprocs < 1) {
fprintf(stderr,
"create %d procs? you must be kidding.\n",
nprocs);
return 1;
}
children = shm_setup(sizeof(struct child_struct)*nprocs);
if (!children) {
printf("Failed to setup shared memory\n");
return end_timer();
}
memset(children, 0, sizeof(*children)*nprocs);
for (i=0;i<nprocs;i++) {
children[i].id = i;
children[i].nprocs = nprocs;
}
for (i=0;i<nprocs;i++) {
if (fork() == 0) {
setbuffer(stdout, NULL, 0);
nb_setup(&children[i]);
children[i].status = getpid();
pause();
fn(&children[i]);
_exit(0);
}
}
do {
synccount = 0;
for (i=0;i<nprocs;i++) {
if (children[i].status) synccount++;
}
if (synccount == nprocs) break;
sleep(1);
} while (end_timer() < 30);
if (synccount != nprocs) {
printf("FAILED TO START %d CLIENTS (started %d)\n", nprocs, synccount);
return end_timer();
}
start_timer();
kill(0, SIGCONT);
-
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This archive was generated by hypermail 2b29 : Sat Feb 15 2003 - 22:00:32 EST