Add support for idletime profiling
Idletime profiling allows a benchmark to run while filling the
idle cycles on the server, hence giving you some metric of how
much pressure the system is under. This is useful to be able
to profile and compare changes in a setup or driver, for instance.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
diff --git a/init.c b/init.c
index fca74fe..f0ad019 100644
--- a/init.c
+++ b/init.c
@@ -22,6 +22,7 @@
#include "verify.h"
#include "profile.h"
#include "server.h"
+#include "idletime.h"
#include "lib/getopt.h"
@@ -213,6 +214,11 @@
.val = 'T',
},
{
+ .name = (char *) "idle-prof",
+ .has_arg = required_argument,
+ .val = 'I',
+ },
+ {
.name = NULL,
},
};
@@ -1290,6 +1296,9 @@
printf(" --server=args\t\tStart a backend fio server\n");
printf(" --daemonize=pidfile\tBackground fio server, write pid to file\n");
printf(" --client=hostname\tTalk to remote backend fio server at hostname\n");
+ printf(" --idle-prof=option\tReport cpu idleness on a system or percpu basis\n"
+ "\t\t\t(option=system,percpu) or run unit work\n"
+ "\t\t\tcalibration only (option=calibrate)\n");
printf("\nFio was written by Jens Axboe <jens.axboe@oracle.com>");
printf("\n Jens Axboe <jaxboe@fusionio.com>\n");
}
@@ -1611,6 +1620,14 @@
case 'D':
pid_file = strdup(optarg);
break;
+ case 'I':
+ if ((ret = fio_idle_prof_parse_opt(optarg))) {
+ /* exit on error and calibration only */
+ do_exit++;
+ if (ret == -1)
+ exit_val = 1;
+ }
+ break;
case 'C':
if (is_backend) {
log_err("fio: can't be both client and server\n");