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spdk/perf: add average latency statistics to perf tool

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Change-Id: Ic8042e0c7b1e727292af211a3857fda987dfb2b0
Signed-off-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Changpeng Liu 2016-05-11 19:42:41 +08:00 committed by Daniel Verkamp
parent aaa533adc7
commit de1669585e
1 changed files with 22 additions and 6 deletions
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28
examples/nvme/perf/perf.c
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@ -90,6 +90,7 @@ struct ns_entry {
struct ns_worker_ctx {
struct ns_entry *entry;
uint64_t io_completed;
uint64_t total_tsc;
uint64_t current_queue_depth;
uint64_t offset_in_ios;
bool is_draining;
@ -113,6 +114,7 @@ struct ns_worker_ctx {
struct perf_task {
struct ns_worker_ctx *ns_ctx;
void *buf;
uint64_t submit_tsc;
#if HAVE_LIBAIO
struct iocb iocb;
#endif
@ -406,6 +408,8 @@ submit_single_io(struct ns_worker_ctx *ns_ctx)
}
}
task->submit_tsc = rte_get_timer_cycles();
if ((g_rw_percentage == 100) ||
(g_rw_percentage != 0 && ((rand_r(&seed) % 100) < g_rw_percentage))) {
#if HAVE_LIBAIO
@ -448,6 +452,7 @@ task_complete(struct perf_task *task)
ns_ctx = task->ns_ctx;
ns_ctx->current_queue_depth--;
ns_ctx->io_completed++;
ns_ctx->total_tsc += rte_get_timer_cycles() - task->submit_tsc;
rte_mempool_put(task_pool, task);
@ -615,13 +620,16 @@ static void usage(char *program_name)
static void
print_performance(void)
{
float io_per_second, mb_per_second;
float total_io_per_second, total_mb_per_second;
uint64_t total_tsc, total_io_completed;
float io_per_second, mb_per_second, average_latency;
float total_io_per_second, total_mb_per_second, total_average_latency;
struct worker_thread *worker;
struct ns_worker_ctx *ns_ctx;
total_io_per_second = 0;
total_mb_per_second = 0;
total_tsc = 0;
total_io_completed = 0;
worker = g_workers;
while (worker) {
@ -629,18 +637,26 @@ print_performance(void)
while (ns_ctx) {
io_per_second = (float)ns_ctx->io_completed / g_time_in_sec;
mb_per_second = io_per_second * g_io_size_bytes / (1024 * 1024);
printf("%-43.43s from core %u: %10.2f IO/s %10.2f MB/s\n",
average_latency = (float)(ns_ctx->total_tsc / ns_ctx->io_completed) * 1000 * 1000 / g_tsc_rate;
printf("%-43.43s from core %u: %10.2f IO/s %10.2f MB/s %10.2f us(average latency)\n",
ns_ctx->entry->name, worker->lcore,
io_per_second, mb_per_second);
io_per_second, mb_per_second,
average_latency);
total_io_per_second += io_per_second;
total_mb_per_second += mb_per_second;
total_tsc += ns_ctx->total_tsc;
total_io_completed += ns_ctx->io_completed;
ns_ctx = ns_ctx->next;
}
worker = worker->next;
}
assert(total_io_completed != 0);
total_average_latency = (float)(total_tsc / total_io_completed) * 1000 * 1000 / g_tsc_rate;;
printf("========================================================\n");
printf("%-55s: %10.2f IO/s %10.2f MB/s\n",
"Total", total_io_per_second, total_mb_per_second);
printf("%-55s: %10.2f IO/s %10.2f MB/s %10.2f us(average latency)\n",
"Total", total_io_per_second, total_mb_per_second, total_average_latency);
printf("\n");
}