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Speed-up 9x7 IDWD by ~30% with OPJ_NUM_THREADS=2 

"bench_dwt -I" time goes from 2.2s to 1.5s
This commit is contained in:
Even Rouault 2020-05-21 16:54:48 +02:00
parent 272b3e0fb2
commit 45a35223b7
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GPG Key ID: 33EBBFC47B3DD87D
1 changed files with 205 additions and 27 deletions
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184
src/lib/openjp2/dwt.c
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@ -2643,12 +2643,99 @@ static void opj_v8dwt_decode(opj_v8dwt_t* OPJ_RESTRICT dwt)
#endif
}
typedef struct {
opj_v8dwt_t h;
OPJ_UINT32 rw;
OPJ_UINT32 w;
OPJ_FLOAT32 * OPJ_RESTRICT aj;
OPJ_UINT32 nb_rows;
} opj_dwt97_decode_h_job_t;
static void opj_dwt97_decode_h_func(void* user_data, opj_tls_t* tls)
{
OPJ_UINT32 j;
opj_dwt97_decode_h_job_t* job;
OPJ_FLOAT32 * OPJ_RESTRICT aj;
OPJ_UINT32 w;
(void)tls;
job = (opj_dwt97_decode_h_job_t*)user_data;
w = job->w;
assert((job->nb_rows % NB_ELTS_V8) == 0);
aj = job->aj;
for (j = 0; j + NB_ELTS_V8 <= job->nb_rows; j += NB_ELTS_V8) {
OPJ_UINT32 k;
opj_v8dwt_interleave_h(&job->h, aj, job->w, NB_ELTS_V8);
opj_v8dwt_decode(&job->h);
/* To be adapted if NB_ELTS_V8 changes */
for (k = 0; k < job->rw; k++) {
aj[k ] = job->h.wavelet[k].f[0];
aj[k + (OPJ_SIZE_T)w ] = job->h.wavelet[k].f[1];
aj[k + (OPJ_SIZE_T)w * 2] = job->h.wavelet[k].f[2];
aj[k + (OPJ_SIZE_T)w * 3] = job->h.wavelet[k].f[3];
}
for (k = 0; k < job->rw; k++) {
aj[k + (OPJ_SIZE_T)w * 4] = job->h.wavelet[k].f[4];
aj[k + (OPJ_SIZE_T)w * 5] = job->h.wavelet[k].f[5];
aj[k + (OPJ_SIZE_T)w * 6] = job->h.wavelet[k].f[6];
aj[k + (OPJ_SIZE_T)w * 7] = job->h.wavelet[k].f[7];
}
aj += w * NB_ELTS_V8;
}
opj_aligned_free(job->h.wavelet);
opj_free(job);
}
typedef struct {
opj_v8dwt_t v;
OPJ_UINT32 rh;
OPJ_UINT32 w;
OPJ_FLOAT32 * OPJ_RESTRICT aj;
OPJ_UINT32 nb_columns;
} opj_dwt97_decode_v_job_t;
static void opj_dwt97_decode_v_func(void* user_data, opj_tls_t* tls)
{
OPJ_UINT32 j;
opj_dwt97_decode_v_job_t* job;
OPJ_FLOAT32 * OPJ_RESTRICT aj;
(void)tls;
job = (opj_dwt97_decode_v_job_t*)user_data;
assert((job->nb_columns % NB_ELTS_V8) == 0);
aj = job->aj;
for (j = 0; j + NB_ELTS_V8 <= job->nb_columns; j += NB_ELTS_V8) {
OPJ_UINT32 k;
opj_v8dwt_interleave_v(&job->v, aj, job->w, NB_ELTS_V8);
opj_v8dwt_decode(&job->v);
for (k = 0; k < job->rh; ++k) {
memcpy(&aj[k * (OPJ_SIZE_T)job->w], &job->v.wavelet[k],
NB_ELTS_V8 * sizeof(OPJ_FLOAT32));
}
aj += NB_ELTS_V8;
}
opj_aligned_free(job->v.wavelet);
opj_free(job);
}
/* <summary> */
/* Inverse 9-7 wavelet transform in 2-D. */
/* </summary> */
static
OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
OPJ_BOOL opj_dwt_decode_tile_97(opj_thread_pool_t* tp,
opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
OPJ_UINT32 numres)
{
opj_v8dwt_t h;
@ -2666,6 +2753,7 @@ OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
tilec->resolutions[tilec->minimum_num_resolutions - 1].x0);
OPJ_SIZE_T l_data_size;
const int num_threads = opj_thread_pool_get_thread_count(tp);
if (numres == 1) {
return OPJ_TRUE;
@ -2705,9 +2793,11 @@ OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
h.win_l_x1 = (OPJ_UINT32)h.sn;
h.win_h_x0 = 0;
h.win_h_x1 = (OPJ_UINT32)h.dn;
if (num_threads <= 1 || rh < 2 * NB_ELTS_V8) {
for (j = 0; j + (NB_ELTS_V8 - 1) < rh; j += NB_ELTS_V8) {
OPJ_UINT32 k;
opj_v8dwt_interleave_h(&h, aj, w, rh - j);
opj_v8dwt_interleave_h(&h, aj, w, NB_ELTS_V8);
opj_v8dwt_decode(&h);
/* To be adapted if NB_ELTS_V8 changes */
@ -2726,6 +2816,48 @@ OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
aj += w * NB_ELTS_V8;
}
} else {
OPJ_UINT32 num_jobs = (OPJ_UINT32)num_threads;
OPJ_UINT32 step_j;
if ((rh / NB_ELTS_V8) < num_jobs) {
num_jobs = rh / NB_ELTS_V8;
}
step_j = ((rh / num_jobs) / NB_ELTS_V8) * NB_ELTS_V8;
for (j = 0; j < num_jobs; j++) {
opj_dwt97_decode_h_job_t* job;
job = (opj_dwt97_decode_h_job_t*) opj_malloc(sizeof(opj_dwt97_decode_h_job_t));
if (!job) {
opj_thread_pool_wait_completion(tp, 0);
opj_aligned_free(h.wavelet);
return OPJ_FALSE;
}
job->h.wavelet = (opj_v8_t*)opj_aligned_malloc(l_data_size * sizeof(opj_v8_t));
if (!job->h.wavelet) {
opj_thread_pool_wait_completion(tp, 0);
opj_free(job);
opj_aligned_free(h.wavelet);
return OPJ_FALSE;
}
job->h.dn = h.dn;
job->h.sn = h.sn;
job->h.cas = h.cas;
job->h.win_l_x0 = h.win_l_x0;
job->h.win_l_x1 = h.win_l_x1;
job->h.win_h_x0 = h.win_h_x0;
job->h.win_h_x1 = h.win_h_x1;
job->rw = rw;
job->w = w;
job->aj = aj;
job->nb_rows = (j + 1 == num_jobs) ? (rh & (OPJ_UINT32)~
(NB_ELTS_V8 - 1)) - j * step_j : step_j;
aj += w * job->nb_rows;
opj_thread_pool_submit_job(tp, opj_dwt97_decode_h_func, job);
}
opj_thread_pool_wait_completion(tp, 0);
j = rh & (OPJ_UINT32)~(NB_ELTS_V8 - 1);
}
if (j < rh) {
OPJ_UINT32 k;
@ -2747,6 +2879,7 @@ OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
v.win_h_x1 = (OPJ_UINT32)v.dn;
aj = (OPJ_FLOAT32*) tilec->data;
if (num_threads <= 1 || rw < 2 * NB_ELTS_V8) {
for (j = rw; j > (NB_ELTS_V8 - 1); j -= NB_ELTS_V8) {
OPJ_UINT32 k;
@ -2758,6 +2891,51 @@ OPJ_BOOL opj_dwt_decode_tile_97(opj_tcd_tilecomp_t* OPJ_RESTRICT tilec,
}
aj += NB_ELTS_V8;
}
} else {
/* "bench_dwt -I" shows that scaling is poor, likely due to RAM
transfer being the limiting factor. So limit the number of
threads.
*/
OPJ_UINT32 num_jobs = opj_uint_max((OPJ_UINT32)num_threads / 2, 2U);
OPJ_UINT32 step_j;
if ((rw / NB_ELTS_V8) < num_jobs) {
num_jobs = rw / NB_ELTS_V8;
}
step_j = ((rw / num_jobs) / NB_ELTS_V8) * NB_ELTS_V8;
for (j = 0; j < num_jobs; j++) {
opj_dwt97_decode_v_job_t* job;
job = (opj_dwt97_decode_v_job_t*) opj_malloc(sizeof(opj_dwt97_decode_v_job_t));
if (!job) {
opj_thread_pool_wait_completion(tp, 0);
opj_aligned_free(h.wavelet);
return OPJ_FALSE;
}
job->v.wavelet = (opj_v8_t*)opj_aligned_malloc(l_data_size * sizeof(opj_v8_t));
if (!job->v.wavelet) {
opj_thread_pool_wait_completion(tp, 0);
opj_free(job);
opj_aligned_free(h.wavelet);
return OPJ_FALSE;
}
job->v.dn = v.dn;
job->v.sn = v.sn;
job->v.cas = v.cas;
job->v.win_l_x0 = v.win_l_x0;
job->v.win_l_x1 = v.win_l_x1;
job->v.win_h_x0 = v.win_h_x0;
job->v.win_h_x1 = v.win_h_x1;
job->rh = rh;
job->w = w;
job->aj = aj;
job->nb_columns = (j + 1 == num_jobs) ? (rw & (OPJ_UINT32)~
(NB_ELTS_V8 - 1)) - j * step_j : step_j;
aj += job->nb_columns;
opj_thread_pool_submit_job(tp, opj_dwt97_decode_v_func, job);
}
opj_thread_pool_wait_completion(tp, 0);
}
if (rw & (NB_ELTS_V8 - 1)) {
OPJ_UINT32 k;
@ -3018,7 +3196,7 @@ OPJ_BOOL opj_dwt_decode_real(opj_tcd_t *p_tcd,
OPJ_UINT32 numres)
{
if (p_tcd->whole_tile_decoding) {
return opj_dwt_decode_tile_97(tilec, numres);
return opj_dwt_decode_tile_97(p_tcd->thread_pool, tilec, numres);
} else {
return opj_dwt_decode_partial_97(tilec, numres);
}