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examples/nvme/perf: add a latency summary

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A single -L can be used to get the latency summary.
Two -L's (or -LL) can be used to get both the latency
summary and the detailed histogram.

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: I3fc0f4e2dfff7b041a665fe35aa33f11e4c3ebad
Reviewed-on: https://review.gerrithub.io/362270
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
This commit is contained in:
Jim Harris 2017-05-23 14:47:14 -07:00
parent 32120b6336
commit 27c6d380b5
2 changed files with 56 additions and 3 deletions
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57
examples/nvme/perf/perf.c
View File

@ -116,6 +116,22 @@ struct ns_entry {
#define BUCKET_MASK (NUM_BUCKETS_PER_RANGE - 1)
#define NUM_BUCKET_RANGES (BUCKET_LSB + 1)
static const double g_latency_cutoffs[] = {
0.01,
0.10,
0.25,
0.50,
0.75,
0.90,
0.95,
0.99,
0.999,
0.9999,
0.99999,
0.999999,
-1,
};
struct ns_worker_ctx {
struct ns_entry *entry;
uint64_t io_completed;
@ -753,6 +769,7 @@ static void usage(char *program_name)
printf("\t\t(read, write, randread, randwrite, rw, randrw)]\n");
printf("\t[-M rwmixread (100 for reads, 0 for writes)]\n");
printf("\t[-L enable latency tracking via sw, default: disabled]\n");
printf("\t\t-L for latency summary, -LL for detailed histogram\n");
printf("\t[-l enable latency tracking via ssd (if supported), default: disabled]\n");
printf("\t[-t time in seconds]\n");
printf("\t[-c core mask for I/O submission/completion.]\n");
@ -833,6 +850,42 @@ print_performance(void)
if (g_latency_sw_tracking_level == 0) {
return;
}
worker = g_workers;
while (worker) {
ns_ctx = worker->ns_ctx;
while (ns_ctx) {
uint64_t i, j, so_far = 0;
double so_far_pct = 0, bucket = 0;
const double *cutoff = g_latency_cutoffs;
printf("Summary latency data for %-43.43s from core %u:\n", ns_ctx->entry->name, worker->lcore);
printf("=================================================================================\n");
for (i = 0; i < NUM_BUCKET_RANGES; i++) {
for (j = 0; j < NUM_BUCKETS_PER_RANGE; j++) {
so_far += ns_ctx->bucket[i][j];
so_far_pct = (double)so_far / total_io_completed;
bucket = get_us_from_bucket(i, j);
if (ns_ctx->bucket[i][j] == 0) {
continue;
}
while (so_far_pct >= *cutoff && *cutoff > 0) {
printf("%8.4f%% : %9.3fus\n", *cutoff * 100, bucket);
cutoff++;
}
}
}
printf("\n");
ns_ctx = ns_ctx->next;
}
worker = worker->next;
}
if (g_latency_sw_tracking_level == 1) {
return;
}
worker = g_workers;
while (worker) {
ns_ctx = worker->ns_ctx;
@ -841,8 +894,8 @@ print_performance(void)
float so_far_pct = 0;
double last_bucket, bucket = 0;
printf("Latency data for %-43.43s from core %u:\n", ns_ctx->entry->name, worker->lcore);
printf("=========================================================================\n");
printf("Latency histogram for %-43.43s from core %u:\n", ns_ctx->entry->name, worker->lcore);
printf("==============================================================================\n");
printf(" Range in us Cumulative IO count\n");
for (i = 0; i < NUM_BUCKET_RANGES; i++) {

2
test/lib/nvme/nvme.sh
View File

@ -30,7 +30,7 @@ done
timing_exit identify
timing_enter perf
$rootdir/examples/nvme/perf/perf -q 128 -w read -s 12288 -t 1 -L
$rootdir/examples/nvme/perf/perf -q 128 -w read -s 12288 -t 1 -LL
timing_exit perf
timing_enter reserve