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| author | Even Rouault <even.rouault@spatialys.com> | 2020-04-30 11:52:42 +0200 |
|---|---|---|
| committer | Even Rouault <even.rouault@spatialys.com> | 2020-05-20 20:30:21 +0200 |
| commit | 07d1f775a1ef95496b0c78b18f671dac41983320 (patch) | |
| tree | 6e69f9d1e92244c2fc1ec4d3b9b4975e7b37b6c4 /src/lib/openjp2/dwt.h | |
| parent | 97eb7e0bf17b476d516262e0af462ec7eeb8f505 (diff) | |
Add multithreaded support in the DWT encoder.
Update the bench_dwt utility to have a -decode/-encode switch
Measured performance gains for DWT encoder on a
Intel(R) Core(TM) i7-6700HQ CPU @ 2.60GHz (4 cores, hyper threaded)
Encoding time:
$ ./bin/bench_dwt -encode -num_threads 1
time for dwt_encode: total = 8.348 s, wallclock = 8.352 s
$ ./bin/bench_dwt -encode -num_threads 2
time for dwt_encode: total = 9.776 s, wallclock = 4.904 s
$ ./bin/bench_dwt -encode -num_threads 4
time for dwt_encode: total = 13.188 s, wallclock = 3.310 s
$ ./bin/bench_dwt -encode -num_threads 8
time for dwt_encode: total = 30.024 s, wallclock = 4.064 s
Scaling is probably limited by memory access patterns causing
memory access to be the bottleneck.
The slightly worse results with threads==8 than with thread==4
is due to hyperthreading being not appropriate here.
Diffstat (limited to 'src/lib/openjp2/dwt.h')
| -rw-r--r-- | src/lib/openjp2/dwt.h | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/src/lib/openjp2/dwt.h b/src/lib/openjp2/dwt.h index 4f63e524..89c859cb 100644 --- a/src/lib/openjp2/dwt.h +++ b/src/lib/openjp2/dwt.h @@ -56,9 +56,11 @@ DWT.C are used by some function in TCD.C. /** Forward 5-3 wavelet transform in 2-D. Apply a reversible DWT transform to a component of an image. +@param p_tcd TCD handle @param tilec Tile component information (current tile) */ -OPJ_BOOL opj_dwt_encode(opj_tcd_tilecomp_t * tilec); +OPJ_BOOL opj_dwt_encode(opj_tcd_t *p_tcd, + opj_tcd_tilecomp_t * tilec); /** Inverse 5-3 wavelet transform in 2-D. @@ -87,9 +89,11 @@ OPJ_FLOAT64 opj_dwt_getnorm(OPJ_UINT32 level, OPJ_UINT32 orient); /** Forward 9-7 wavelet transform in 2-D. Apply an irreversible DWT transform to a component of an image. +@param p_tcd TCD handle @param tilec Tile component information (current tile) */ -OPJ_BOOL opj_dwt_encode_real(opj_tcd_tilecomp_t * tilec); +OPJ_BOOL opj_dwt_encode_real(opj_tcd_t *p_tcd, + opj_tcd_tilecomp_t * tilec); /** Inverse 9-7 wavelet transform in 2-D. Apply an irreversible inverse DWT transform to a component of an image. |