diff options
| author | Pekka Paalanen <pekka.paalanen@collabora.co.uk> | 2015-06-10 13:54:01 +0300 |
|---|---|---|
| committer | Pekka Paalanen <pekka.paalanen@collabora.co.uk> | 2015-07-06 12:04:50 +0300 |
| commit | e2d211ac491cd9884aae7ccaf18e5b3042469cf2 (patch) | |
| tree | 9ec605e37c6b0b0d38b6f5cc8065b437b8471efc | |
| parent | 31cb0d4267f4f358b62f75fd42c4b1ae625be7ee (diff) | |
lowlevel-blt-bench: add option to skip memcpy measurement
The memcpy speed measurement takes several seconds. When you are running
single tests in a harness that iterates dozens or hundreds of times, the
repeated measurements are redundant and take a lot of time. It is also
an open question whether the measured speed changes over long test runs
due to unidentified platform reasons (Raspberry Pi).
Add a command line option to set the reference memcpy speed, skipping
the measuring.
The speed is mainly used to compute how many iterations do run inside
the bench_*() functions, so for repeated testing on the same hardware,
it makes sense to lock that number to a constant.
Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Ben Avison <bavison@riscosopen.org>
| -rw-r--r-- | test/lowlevel-blt-bench.c | 11 |
1 files changed, 8 insertions, 3 deletions
diff --git a/test/lowlevel-blt-bench.c b/test/lowlevel-blt-bench.c index 17e5ec4..fc7472f 100644 --- a/test/lowlevel-blt-bench.c +++ b/test/lowlevel-blt-bench.c @@ -55,7 +55,7 @@ uint32_t *dst; uint32_t *src; uint32_t *mask; -double bandwidth = 0; +double bandwidth = 0.0; double bench_memcpy () @@ -1086,10 +1086,11 @@ print_speed_scaling (double bw) static void usage (const char *progname) { - printf ("Usage: %s [-b] [-n] [-c] pattern\n", progname); + printf ("Usage: %s [-b] [-n] [-c] [-m M] pattern\n", progname); printf (" -n : benchmark nearest scaling\n"); printf (" -b : benchmark bilinear scaling\n"); printf (" -c : print output as CSV data\n"); + printf (" -m M : set reference memcpy speed to M MB/s instead of measuring it\n"); } int @@ -1115,6 +1116,9 @@ main (int argc, char *argv[]) if (strchr (argv[i] + 1, 'c')) use_csv_output = TRUE; + + if (strcmp (argv[i], "-m") == 0 && i + 1 < argc) + bandwidth = atof (argv[++i]) * 1e6; } else { @@ -1138,7 +1142,8 @@ main (int argc, char *argv[]) if (!use_csv_output) print_explanation (); - bandwidth = bench_memcpy (); + if (bandwidth < 1.0) + bandwidth = bench_memcpy (); if (!use_csv_output) print_speed_scaling (bandwidth); |