Sorry, I attached the wrong C-program in the previous posting ....
here is the corrected version:
Hi,
attached is a little C program that spawns off a task which runs a
heavy tiny math job. Despite my 8 processor machine, taking this one
task to 99% CPU load slows down the entire computer, often such that
there is no return except for a forced restart.
I run the xenomai-head git, updated on Oct. 29 the last time, on a
i386 ubuntu system with kernel 2.6.29.5.
Does anybody know what is going wrong here, i.e., am I not permitted
to take my CPUs to the max load?
Any help would be highly appreciated!!!
Best wishes,
-Stefan
Compile statement:
gcc -o xtest xeno_spawn_test.c -I/usr/xenomai/include -Wl,@/usr/
xenomai/lib/posix.wrappers -L/usr/xenomai/lib -lpthre
ad_rt -lpthread -lrt -lnative
Run:
unix> xtest
------------------------------------------------ xeno_spawn_test.c
---------------------------------------------
#include <sys/mman.h>
#include <native/task.h>
#include <pthread.h>
#include <stdio.h>
#include <math.h>
RT_TASK task;
// a quick task run ....
void
run_task(void *dummy)
{
int i;
double foo = 1.0;
for (i=1; i<=100000000; ++i)
foo = foo*1.1;
return;
}
// main program
int
main() {
int rc;
pthread_attr_t pth_attr;
mlockall(MCL_CURRENT | MCL_FUTURE);
// spawn the task
if ((rc=rt_task_spawn(&task,"run_task",100000,1,T_JOINABLE|T_FPU|
T_CPU(1),run_task,NULL)))
printf("rt_task_spawn returned %d\n",rc);
rt_task_join(&task);
return 1;
}
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