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readtest: calculate running average and stddev

This commit is contained in:
Robin Gareus 2015-01-28 17:29:33 +01:00
parent 07e53fc2e7
commit 9f93df0313
1 changed files with 14 additions and 1 deletions
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15
tools/readtest.c
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@ -143,6 +143,9 @@ main (int argc, char* argv[])
uint64_t _read = 0;
double max_elapsed = 0;
double total_time = 0;
double var_m = 0;
double var_s = 0;
uint64_t cnt = 0;
while (1) {
gint64 before;
@ -165,6 +168,15 @@ main (int argc, char* argv[])
total_time += elapsed;
++cnt;
if (max_elapsed == 0) {
var_m = elapsed;
} else {
const double var_m1 = var_m;
var_m = var_m + (elapsed - var_m) / (double)(cnt);
var_s = var_s + (elapsed - var_m) * (elapsed - var_m1);
}
if (elapsed > max_elapsed) {
max_elapsed = elapsed;
}
@ -173,12 +185,13 @@ main (int argc, char* argv[])
out:
if (max_elapsed > 0 && total_time > 0) {
double stddev = cnt > 1 ? sqrt(var_s / ((double)(cnt-1))) : 0;
double bandwidth = ((nfiles * _read)/1048576.0) / (total_time/1000000.0);
double min_throughput = ((nfiles * block_size)/1048576.0) / (max_elapsed/1000000.0);
printf ("# Min: %.4f MB/sec Avg: %.4f MB/sec || Max: %.3f sec \n", min_throughput, bandwidth, max_elapsed/1000000.0);
printf ("# Max Track count: %d @ 48000SPS\n", (int) floor(1048576.0 * bandwidth / (4 * 48000.)));
printf ("# Sus Track count: %d @ 48000SPS\n", (int) floor(1048576.0 * min_throughput / (4 * 48000.)));
printf ("%d %.4f %.4f %.4f\n", block_size, min_throughput, bandwidth, max_elapsed/1000000.0);
printf ("%d %.4f %.4f %.4f %.5f\n", block_size, min_throughput, bandwidth, max_elapsed/1000000.0, stddev/1000000.0);
}
return 0;