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nvme/perf: avoid divide by 0 if no I/O completed

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Change-Id: I7ccff922465195c7fe9836633196cd7a8816c11c
Signed-off-by: Daniel Verkamp <daniel.verkamp@intel.com>
Reviewed-on: https://review.gerrithub.io/365071
Tested-by: SPDK Automated Test System <sys_sgsw@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Jim Harris <james.r.harris@intel.com>
This commit is contained in:
Daniel Verkamp 2017-06-12 13:59:17 -07:00 committed by Jim Harris
parent f65731c47e
commit 127cc4c0f3
1 changed files with 19 additions and 17 deletions
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36
examples/nvme/perf/perf.c
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@ -765,22 +765,24 @@ print_performance(void)
while (worker) {
ns_ctx = worker->ns_ctx;
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);
average_latency = (float)(ns_ctx->total_tsc / ns_ctx->io_completed) * 1000 * 1000 / g_tsc_rate;
min_latency = (float)ns_ctx->min_tsc * 1000 * 1000 / g_tsc_rate;
max_latency = (float)ns_ctx->max_tsc * 1000 * 1000 / g_tsc_rate;
printf("%-43.43s from core %u: %10.2f %10.2f %10.2f %10.2f %10.2f\n",
ns_ctx->entry->name, worker->lcore,
io_per_second, mb_per_second,
average_latency, min_latency, max_latency);
total_io_per_second += io_per_second;
total_mb_per_second += mb_per_second;
total_io_completed += ns_ctx->io_completed;
sum_ave_latency += average_latency;
sum_min_latency += min_latency;
sum_max_latency += max_latency;
ns_count++;
if (ns_ctx->io_completed != 0) {
io_per_second = (float)ns_ctx->io_completed / g_time_in_sec;
mb_per_second = io_per_second * g_io_size_bytes / (1024 * 1024);
average_latency = (float)(ns_ctx->total_tsc / ns_ctx->io_completed) * 1000 * 1000 / g_tsc_rate;
min_latency = (float)ns_ctx->min_tsc * 1000 * 1000 / g_tsc_rate;
max_latency = (float)ns_ctx->max_tsc * 1000 * 1000 / g_tsc_rate;
printf("%-43.43s from core %u: %10.2f %10.2f %10.2f %10.2f %10.2f\n",
ns_ctx->entry->name, worker->lcore,
io_per_second, mb_per_second,
average_latency, min_latency, max_latency);
total_io_per_second += io_per_second;
total_mb_per_second += mb_per_second;
total_io_completed += ns_ctx->io_completed;
sum_ave_latency += average_latency;
sum_min_latency += min_latency;
sum_max_latency += max_latency;
ns_count++;
}
ns_ctx = ns_ctx->next;
}
worker = worker->next;
@ -795,7 +797,7 @@ print_performance(void)
printf("\n");
}
if (g_latency_sw_tracking_level == 0) {
if (g_latency_sw_tracking_level == 0 || total_io_completed == 0) {
return;
}