Skip to content

Adjusted loops_per_ms calibration to avoid infinite loop on some machines #1

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Open
bartek-poleszak wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Adjusted loops_per_ms calibration to avoid infinite loop on some machines #1

Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
14 changes: 10 additions & 4 deletions interbench.c
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -986,7 +986,7 @@ void calibrate_loop(void)
{
unsigned long long start_time, loops_per_msec, run_time = 0;
struct timespec myts;
unsigned long loops;
unsigned long loops, fail_count = 0, recheck_count = 1;
cpu_set_t cpumask;

CPU_ZERO(&cpumask);
Expand Down Expand Up @@ -1022,12 +1022,18 @@ void calibrate_loop(void)
sleep(1);
loops = loops_per_msec;
start_time = get_nsecs(&myts);
burn_loops(loops);
run_time = get_nsecs(&myts) - start_time;
burn_loops(loops * recheck_count);
run_time = (get_nsecs(&myts) - start_time) / recheck_count;

/* Tolerate 5% difference on checking */
if (run_time > 1050000 || run_time < 950000)
if (run_time > 1050000 || run_time < 950000) {
/* Increase recheck time if 5% margin is missed too often */
if (++fail_count >= 50) {
recheck_count *= 2;
fail_count = 0;
}
goto redo;
}

ud.loops_per_ms = loops_per_msec;
sched_setaffinity(0, sizeof(ud.cpumask), &ud.cpumask);
Expand Down