Read Speed Test

The following terminal output shows the difference in processing requirements for 24bit little endian and 32bit float wav files when loading from the disk. This is a strong indicator that we should ALWAYS keep our wav files in 32bit on disk to enhance disk streaming.

  time ./test.out test_24le.wav
  real	0m13.421s
  user	0m9.944s
  sys	0m3.464s

  time ./test.out test_float.wav
  real	0m4.410s
  user	0m0.376s
  sys	0m4.028s

The code:

#include <sndfile.h>
#define N 100
int main(int argc, char*argv[])
        for(int n = 0; n < N; ++n)
                SF_INFO sf_info;
                SNDFILE *fh = sf_open(argv[1], SFM_READ, &sf_info);
                float samples[1024];
                        sf_count_t r = sf_read_float(fh, samples, 1024);
                        if(r < 1024) break;
        return 1;

The files used were ~200MB

speed_test.txt ยท Last modified: 2017/03/24 20:51 by deva
Trace: speed_test
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