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nvme/overhead: track min and max submit/complete

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Add slightly better statistics to get a range of values instead of just
the average.

Change-Id: I159994dce38412755afdd8980030c407125957e9
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
This commit is contained in:
Daniel Verkamp 2016-08-15 16:03:47 -07:00
parent ab7deee952
commit 0b3bd6a9c5
1 changed files with 26 additions and 5 deletions
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31
test/lib/nvme/overhead/overhead.c
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@ -112,7 +112,11 @@ static int g_aio_optind; /* Index of first AIO filename in argv */
struct perf_task *g_task; struct perf_task *g_task;
uint64_t g_tsc_submit = 0; uint64_t g_tsc_submit = 0;
uint64_t g_tsc_submit_min = UINT64_MAX;
uint64_t g_tsc_submit_max = 0;
uint64_t g_tsc_complete = 0; uint64_t g_tsc_complete = 0;
uint64_t g_tsc_complete_min = UINT64_MAX;
uint64_t g_tsc_complete_max = 0;
uint64_t g_io_completed = 0; uint64_t g_io_completed = 0;
static void static void
@ -286,6 +290,7 @@ submit_single_io(void)
uint64_t start; uint64_t start;
int rc; int rc;
struct ns_entry *entry = g_ns; struct ns_entry *entry = g_ns;
uint64_t tsc_submit;
offset_in_ios = rand_r(&seed) % entry->size_in_ios; offset_in_ios = rand_r(&seed) % entry->size_in_ios;
@ -304,7 +309,14 @@ submit_single_io(void)
} }
rte_mb(); rte_mb();
g_tsc_submit += rte_get_tsc_cycles() - start; tsc_submit = rte_get_tsc_cycles() - start;
g_tsc_submit += tsc_submit;
if (tsc_submit < g_tsc_submit_min) {
g_tsc_submit_min = tsc_submit;
}
if (tsc_submit > g_tsc_submit_max) {
g_tsc_submit_max = tsc_submit;
}
if (rc != 0) { if (rc != 0) {
fprintf(stderr, "starting I/O failed\n"); fprintf(stderr, "starting I/O failed\n");
@ -324,7 +336,7 @@ uint64_t g_complete_tsc_start;
static void static void
check_io(void) check_io(void)
{ {
uint64_t end; uint64_t end, tsc_complete;
rte_mb(); rte_mb();
#if HAVE_LIBAIO #if HAVE_LIBAIO
if (g_ns->type == ENTRY_TYPE_AIO_FILE) { if (g_ns->type == ENTRY_TYPE_AIO_FILE) {
@ -349,7 +361,14 @@ check_io(void)
g_complete_tsc_start = end; g_complete_tsc_start = end;
} }
} else { } else {
g_tsc_complete += end - g_complete_tsc_start; tsc_complete = end - g_complete_tsc_start;
g_tsc_complete += tsc_complete;
if (tsc_complete < g_tsc_complete_min) {
g_tsc_complete_min = tsc_complete;
}
if (tsc_complete > g_tsc_complete_max) {
g_tsc_complete_max = tsc_complete;
}
g_io_completed++; g_io_completed++;
if (!g_ns->is_draining) { if (!g_ns->is_draining) {
submit_single_io(); submit_single_io();
@ -468,8 +487,10 @@ print_stats(void)
printf("g_tsc_complete = %ju\n", g_tsc_complete); printf("g_tsc_complete = %ju\n", g_tsc_complete);
printf("g_io_completed = %ju\n", g_io_completed); printf("g_io_completed = %ju\n", g_io_completed);
printf("avg submit = %8.1f\n", (float)g_tsc_submit / g_io_completed); printf("submit avg, min, max = %8.1f, %ju, %ju\n",
printf("avg complete = %8.1f\n", (float)g_tsc_complete / g_io_completed); (float)g_tsc_submit / g_io_completed, g_tsc_submit_min, g_tsc_submit_max);
printf("complete avg, min, max = %8.1f, %ju, %ju\n",
(float)g_tsc_complete / g_io_completed, g_tsc_complete_min, g_tsc_complete_max);
} }
static int static int