A Silly FPU Issue
Test-case for Reproducing FPU Issue
The abuse program.
#include <sys/types.h>
#include <stdio.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
int main(void) {
pid_t pid;
pid = getpid();
printf("%u: pid / PI = %f\n", pid, pid / M_PI);
kill(pid, SIGSEGV);
return 0;
}
Piping Cores to a Script getcore.sh.
#!/bin/bash
/bin/gzip > "$1"
Modify core_pattern and Test it.
#!/bin/bash
mkdir -p /var/core/core2
echo "|/var/home/sysadmin/getcore.sh /var/core/core2/core.%e.%p.%t.gz" > /proc/sys/kernel/core_pattern
CORE_DIR="/var/core/core2"
clean_cores() {
find ${CORE_DIR} -name "core.abuse.*" | xargs rm
}
ROUND=0
run_test_one() {
ROUND=$[$ROUND+1]
echo "[Testing FPU Abuse] Round ${ROUND}"
echo
for i in `seq 1 1 10000`; do ./abuse & echo -n; done
echo "[Tesing FPU Abuse] Round ${ROUND} finished, waiting for 10 seconds ..."
sleep 10
echo "[Tesing FPU Abuse] Cleaning cores ..."
clean_cores
echo "[Tesing FPU Abuse] Cleaning cores, done"
}
run_test() {
echo "Started " `date` > test_abuse.log
ROUND=0
while true
do
run_test_one
done
}
echo "Started " `date` > test_abuse.log
run_test_one
#run_test