Add options for disabling slat/clat/bw measurements
Useful for cutting down on the number of gettimeofday calls in
situations where that does impact performance. This is mostly for
really high IOPS rates.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/io_u.c b/io_u.c
index 0896942..62a76b9 100644
--- a/io_u.c
+++ b/io_u.c
@@ -905,11 +905,16 @@
td->this_io_bytes[idx] += bytes;
if (ramp_time_over(td)) {
- usec = utime_since(&io_u->issue_time, &icd->time);
+ if (!td->o.disable_clat || !td->o.disable_bw)
+ usec = utime_since(&io_u->issue_time,
+ &icd->time);
- add_clat_sample(td, idx, usec);
- add_bw_sample(td, idx, &icd->time);
- io_u_mark_latency(td, usec);
+ if (!td->o.disable_clat) {
+ add_clat_sample(td, idx, usec);
+ io_u_mark_latency(td, usec);
+ }
+ if (!td->o.disable_bw)
+ add_bw_sample(td, idx, &icd->time);
}
if (td_write(td) && idx == DDIR_WRITE &&
@@ -930,9 +935,11 @@
}
}
-static void init_icd(struct io_completion_data *icd, int nr)
+static void init_icd(struct thread_data *td, struct io_completion_data *icd,
+ int nr)
{
- fio_gettime(&icd->time, NULL);
+ if (!td->o.disable_clat || !td->o.disable_bw)
+ fio_gettime(&icd->time, NULL);
icd->nr = nr;
@@ -961,7 +968,7 @@
{
struct io_completion_data icd;
- init_icd(&icd, 1);
+ init_icd(td, &icd, 1);
io_completed(td, io_u, &icd);
put_io_u(td, io_u);
@@ -994,7 +1001,7 @@
} else if (!ret)
return ret;
- init_icd(&icd, ret);
+ init_icd(td, &icd, ret);
ios_completed(td, &icd);
if (!icd.error)
return icd.bytes_done[0] + icd.bytes_done[1];
@@ -1008,10 +1015,12 @@
*/
void io_u_queued(struct thread_data *td, struct io_u *io_u)
{
- unsigned long slat_time;
+ if (!td->o.disable_slat) {
+ unsigned long slat_time;
- slat_time = utime_since(&io_u->start_time, &io_u->issue_time);
- add_slat_sample(td, io_u->ddir, slat_time);
+ slat_time = utime_since(&io_u->start_time, &io_u->issue_time);
+ add_slat_sample(td, io_u->ddir, slat_time);
+ }
}
/*