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Reapply 'Amend and improve VP8 multithreading implementation'

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Reapply this patch:
ff0107f Amend and improve VP8 multithreading implementation

Amended the patch to add a unit test, and fix an asan error.

BUG=webm:851

Change-Id: I6572c03256169c64e80248bf5a5e99f59a2fc93c
This commit is contained in:
Jim Bankoski 2016-12-12 16:27:21 -08:00 committed by James Zern
parent 121e161115
commit 85a541a421
8 changed files with 161 additions and 51 deletions
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6
test/test_vector_test.cc
View File

@ -145,21 +145,21 @@ TEST_P(TestVectorTest, MD5Match) {
ASSERT_NO_FATAL_FAILURE(RunLoop(video.get(), cfg));
}
// Test VP8 decode in serial mode with single thread and with 8 threads.
// Test VP8 decode in serial mode with single thread.
// NOTE: VP8 only support serial mode.
#if CONFIG_VP8_DECODER
VP8_INSTANTIATE_TEST_CASE(
TestVectorTest,
::testing::Combine(
::testing::Values(0), // Serial Mode.
::testing::Values(1), // Single thread and 8 threads.
::testing::Values(1), // Single thread.
::testing::ValuesIn(libvpx_test::kVP8TestVectors,
libvpx_test::kVP8TestVectors +
libvpx_test::kNumVP8TestVectors)));
// Test VP8 decode in with different numbers of threads.
INSTANTIATE_TEST_CASE_P(
DISABLED_VP8MultiThreaded, TestVectorTest,
VP8MultiThreaded, TestVectorTest,
::testing::Combine(
::testing::Values(
static_cast<const libvpx_test::CodecFactory *>(&libvpx_test::kVP8)),

38
vp8/common/threading.h
View File

@ -193,6 +193,44 @@ static inline int sem_destroy(sem_t *sem) {
#include "vpx_util/vpx_thread.h"
static INLINE void mutex_lock(pthread_mutex_t *const mutex) {
const int kMaxTryLocks = 4000;
int locked = 0;
int i;
for (i = 0; i < kMaxTryLocks; ++i) {
if (!pthread_mutex_trylock(mutex)) {
locked = 1;
break;
}
}
if (!locked) pthread_mutex_lock(mutex);
}
static INLINE int protected_read(pthread_mutex_t *const mutex, const int *p) {
int ret;
mutex_lock(mutex);
ret = *p;
pthread_mutex_unlock(mutex);
return ret;
}
static INLINE void sync_read(pthread_mutex_t *const mutex, int mb_col,
const int *last_row_current_mb_col,
const int nsync) {
while (mb_col > (protected_read(mutex, last_row_current_mb_col) - nsync)) {
x86_pause_hint();
thread_sleep(0);
}
}
static INLINE void protected_write(pthread_mutex_t *mutex, int *p, int v) {
mutex_lock(mutex);
*p = v;
pthread_mutex_unlock(mutex);
}
#endif /* CONFIG_OS_SUPPORT && CONFIG_MULTITHREAD */
#ifdef __cplusplus

5
vp8/decoder/onyxd_int.h
View File

@ -67,7 +67,8 @@ typedef struct VP8D_COMP {
#if CONFIG_MULTITHREAD
/* variable for threading */
volatile int b_multithreaded_rd;
int b_multithreaded_rd;
int max_threads;
int current_mb_col_main;
unsigned int decoding_thread_count;
@ -76,6 +77,8 @@ typedef struct VP8D_COMP {
int mt_baseline_filter_level[MAX_MB_SEGMENTS];
int sync_range;
int *mt_current_mb_col; /* Each row remembers its already decoded column. */
pthread_mutex_t *pmutex;
pthread_mutex_t mt_mutex; /* mutex for b_multithreaded_rd */
unsigned char **mt_yabove_row; /* mb_rows x width */
unsigned char **mt_uabove_row;

58
vp8/decoder/threading.c
View File

@ -50,9 +50,6 @@ static void setup_decoding_thread_data(VP8D_COMP *pbi, MACROBLOCKD *xd,
mbd->subpixel_predict8x8 = xd->subpixel_predict8x8;
mbd->subpixel_predict16x16 = xd->subpixel_predict16x16;
mbd->mode_info_context = pc->mi + pc->mode_info_stride * (i + 1);
mbd->mode_info_stride = pc->mode_info_stride;
mbd->frame_type = pc->frame_type;
mbd->pre = xd->pre;
mbd->dst = xd->dst;
@ -251,8 +248,8 @@ static void mt_decode_macroblock(VP8D_COMP *pbi, MACROBLOCKD *xd,
static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd,
int start_mb_row) {
volatile const int *last_row_current_mb_col;
volatile int *current_mb_col;
const int *last_row_current_mb_col;
int *current_mb_col;
int mb_row;
VP8_COMMON *pc = &pbi->common;
const int nsync = pbi->sync_range;
@ -289,6 +286,9 @@ static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd,
xd->up_available = (start_mb_row != 0);
xd->mode_info_context = pc->mi + pc->mode_info_stride * start_mb_row;
xd->mode_info_stride = pc->mode_info_stride;
for (mb_row = start_mb_row; mb_row < pc->mb_rows;
mb_row += (pbi->decoding_thread_count + 1)) {
int recon_yoffset, recon_uvoffset;
@ -355,14 +355,15 @@ static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd,
xd->dst.uv_stride);
}
for (mb_col = 0; mb_col < pc->mb_cols; mb_col++) {
*current_mb_col = mb_col - 1;
for (mb_col = 0; mb_col < pc->mb_cols; ++mb_col) {
if (((mb_col - 1) % nsync) == 0) {
pthread_mutex_t *mutex = &pbi->pmutex[mb_row];
protected_write(mutex, current_mb_col, mb_col - 1);
}
if ((mb_col & (nsync - 1)) == 0) {
while (mb_col > (*last_row_current_mb_col - nsync)) {
x86_pause_hint();
thread_sleep(0);
}
if (mb_row && !(mb_col & (nsync - 1))) {
pthread_mutex_t *mutex = &pbi->pmutex[mb_row - 1];
sync_read(mutex, mb_col, last_row_current_mb_col, nsync);
}
/* Distance of MB to the various image edges.
@ -548,7 +549,7 @@ static void mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd,
}
/* last MB of row is ready just after extension is done */
*current_mb_col = mb_col + nsync;
protected_write(&pbi->pmutex[mb_row], current_mb_col, mb_col + nsync);
++xd->mode_info_context; /* skip prediction column */
xd->up_available = 1;
@ -568,10 +569,10 @@ static THREAD_FUNCTION thread_decoding_proc(void *p_data) {
ENTROPY_CONTEXT_PLANES mb_row_left_context;
while (1) {
if (pbi->b_multithreaded_rd == 0) break;
if (protected_read(&pbi->mt_mutex, &pbi->b_multithreaded_rd) == 0) break;
if (sem_wait(&pbi->h_event_start_decoding[ithread]) == 0) {
if (pbi->b_multithreaded_rd == 0) {
if (protected_read(&pbi->mt_mutex, &pbi->b_multithreaded_rd) == 0) {
break;
} else {
MACROBLOCKD *xd = &mbrd->mbd;
@ -591,6 +592,7 @@ void vp8_decoder_create_threads(VP8D_COMP *pbi) {
pbi->b_multithreaded_rd = 0;
pbi->allocated_decoding_thread_count = 0;
pthread_mutex_init(&pbi->mt_mutex, NULL);
/* limit decoding threads to the max number of token partitions */
core_count = (pbi->max_threads > 8) ? 8 : pbi->max_threads;
@ -647,6 +649,16 @@ void vp8_decoder_create_threads(VP8D_COMP *pbi) {
void vp8mt_de_alloc_temp_buffers(VP8D_COMP *pbi, int mb_rows) {
int i;
/* De-allocate mutex */
if (pbi->pmutex != NULL) {
for (i = 0; i < mb_rows; ++i) {
pthread_mutex_destroy(&pbi->pmutex[i]);
}
vpx_free(pbi->pmutex);
pbi->pmutex = NULL;
}
vpx_free(pbi->mt_current_mb_col);
pbi->mt_current_mb_col = NULL;
@ -712,7 +724,7 @@ void vp8mt_alloc_temp_buffers(VP8D_COMP *pbi, int width, int prev_mb_rows) {
int i;
int uv_width;
if (pbi->b_multithreaded_rd) {
if (protected_read(&pbi->mt_mutex, &pbi->b_multithreaded_rd)) {
vp8mt_de_alloc_temp_buffers(pbi, prev_mb_rows);
/* our internal buffers are always multiples of 16 */
@ -730,6 +742,15 @@ void vp8mt_alloc_temp_buffers(VP8D_COMP *pbi, int width, int prev_mb_rows) {
uv_width = width >> 1;
/* Allocate mutex */
CHECK_MEM_ERROR(pbi->pmutex,
vpx_malloc(sizeof(*pbi->pmutex) * pc->mb_rows));
if (pbi->pmutex) {
for (i = 0; i < pc->mb_rows; ++i) {
pthread_mutex_init(&pbi->pmutex[i], NULL);
}
}
/* Allocate an int for each mb row. */
CALLOC_ARRAY(pbi->mt_current_mb_col, pc->mb_rows);
@ -772,9 +793,9 @@ void vp8mt_alloc_temp_buffers(VP8D_COMP *pbi, int width, int prev_mb_rows) {
void vp8_decoder_remove_threads(VP8D_COMP *pbi) {
/* shutdown MB Decoding thread; */
if (pbi->b_multithreaded_rd) {
if (protected_read(&pbi->mt_mutex, &pbi->b_multithreaded_rd)) {
int i;
pbi->b_multithreaded_rd = 0;
protected_write(&pbi->mt_mutex, &pbi->b_multithreaded_rd, 0);
/* allow all threads to exit */
for (i = 0; i < pbi->allocated_decoding_thread_count; ++i) {
@ -804,6 +825,7 @@ void vp8_decoder_remove_threads(VP8D_COMP *pbi) {
vp8mt_de_alloc_temp_buffers(pbi, pbi->common.mb_rows);
}
pthread_mutex_destroy(&pbi->mt_mutex);
}
void vp8mt_decode_mb_rows(VP8D_COMP *pbi, MACROBLOCKD *xd) {

21
vp8/encoder/encodeframe.c
View File

@ -345,8 +345,8 @@ static void encode_mb_row(VP8_COMP *cpi, VP8_COMMON *cm, int mb_row,
#if CONFIG_MULTITHREAD
const int nsync = cpi->mt_sync_range;
const int rightmost_col = cm->mb_cols + nsync;
volatile const int *last_row_current_mb_col;
volatile int *current_mb_col = &cpi->mt_current_mb_col[mb_row];
const int *last_row_current_mb_col;
int *current_mb_col = &cpi->mt_current_mb_col[mb_row];
if ((cpi->b_multi_threaded != 0) && (mb_row != 0)) {
last_row_current_mb_col = &cpi->mt_current_mb_col[mb_row - 1];
@ -419,13 +419,14 @@ static void encode_mb_row(VP8_COMP *cpi, VP8_COMMON *cm, int mb_row,
#if CONFIG_MULTITHREAD
if (cpi->b_multi_threaded != 0) {
*current_mb_col = mb_col - 1; /* set previous MB done */
if (((mb_col - 1) % nsync) == 0) {
pthread_mutex_t *mutex = &cpi->pmutex[mb_row];
protected_write(mutex, current_mb_col, mb_col - 1);
}
if ((mb_col & (nsync - 1)) == 0) {
while (mb_col > (*last_row_current_mb_col - nsync)) {
x86_pause_hint();
thread_sleep(0);
}
if (mb_row && !(mb_col & (nsync - 1))) {
pthread_mutex_t *mutex = &cpi->pmutex[mb_row - 1];
sync_read(mutex, mb_col, last_row_current_mb_col, nsync);
}
}
#endif
@ -565,7 +566,9 @@ static void encode_mb_row(VP8_COMP *cpi, VP8_COMMON *cm, int mb_row,
xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
#if CONFIG_MULTITHREAD
if (cpi->b_multi_threaded != 0) *current_mb_col = rightmost_col;
if (cpi->b_multi_threaded != 0) {
protected_write(&cpi->pmutex[mb_row], current_mb_col, rightmost_col);
}
#endif
/* this is to account for the border */

48
vp8/encoder/ethreading.c
View File

@ -25,11 +25,11 @@ static THREAD_FUNCTION thread_loopfilter(void *p_data) {
VP8_COMMON *cm = &cpi->common;
while (1) {
if (cpi->b_multi_threaded == 0) break;
if (protected_read(&cpi->mt_mutex, &cpi->b_multi_threaded) == 0) break;
if (sem_wait(&cpi->h_event_start_lpf) == 0) {
/* we're shutting down */
if (cpi->b_multi_threaded == 0) break;
if (protected_read(&cpi->mt_mutex, &cpi->b_multi_threaded) == 0) break;
vp8_loopfilter_frame(cpi, cm);
@ -47,7 +47,7 @@ static THREAD_FUNCTION thread_encoding_proc(void *p_data) {
ENTROPY_CONTEXT_PLANES mb_row_left_context;
while (1) {
if (cpi->b_multi_threaded == 0) break;
if (protected_read(&cpi->mt_mutex, &cpi->b_multi_threaded) == 0) break;
if (sem_wait(&cpi->h_event_start_encoding[ithread]) == 0) {
const int nsync = cpi->mt_sync_range;
@ -65,7 +65,10 @@ static THREAD_FUNCTION thread_encoding_proc(void *p_data) {
int *totalrate = &mbri->totalrate;
/* we're shutting down */
if (cpi->b_multi_threaded == 0) break;
if (protected_read(&cpi->mt_mutex, &cpi->b_multi_threaded) == 0) break;
xd->mode_info_context = cm->mi + cm->mode_info_stride * (ithread + 1);
xd->mode_info_stride = cm->mode_info_stride;
for (mb_row = ithread + 1; mb_row < cm->mb_rows;
mb_row += (cpi->encoding_thread_count + 1)) {
@ -76,8 +79,8 @@ static THREAD_FUNCTION thread_encoding_proc(void *p_data) {
int recon_y_stride = cm->yv12_fb[ref_fb_idx].y_stride;
int recon_uv_stride = cm->yv12_fb[ref_fb_idx].uv_stride;
int map_index = (mb_row * cm->mb_cols);
volatile const int *last_row_current_mb_col;
volatile int *current_mb_col = &cpi->mt_current_mb_col[mb_row];
const int *last_row_current_mb_col;
int *current_mb_col = &cpi->mt_current_mb_col[mb_row];
#if (CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING)
vp8_writer *w = &cpi->bc[1 + (mb_row % num_part)];
@ -103,13 +106,14 @@ static THREAD_FUNCTION thread_encoding_proc(void *p_data) {
/* for each macroblock col in image */
for (mb_col = 0; mb_col < cm->mb_cols; ++mb_col) {
*current_mb_col = mb_col - 1;
if (((mb_col - 1) % nsync) == 0) {
pthread_mutex_t *mutex = &cpi->pmutex[mb_row];
protected_write(mutex, current_mb_col, mb_col - 1);
}
if ((mb_col & (nsync - 1)) == 0) {
while (mb_col > (*last_row_current_mb_col - nsync)) {
x86_pause_hint();
thread_sleep(0);
}
if (mb_row && !(mb_col & (nsync - 1))) {
pthread_mutex_t *mutex = &cpi->pmutex[mb_row - 1];
sync_read(mutex, mb_col, last_row_current_mb_col, nsync);
}
#if CONFIG_REALTIME_ONLY & CONFIG_ONTHEFLY_BITPACKING
@ -281,7 +285,7 @@ static THREAD_FUNCTION thread_encoding_proc(void *p_data) {
vp8_extend_mb_row(&cm->yv12_fb[dst_fb_idx], xd->dst.y_buffer + 16,
xd->dst.u_buffer + 8, xd->dst.v_buffer + 8);
*current_mb_col = mb_col + nsync;
protected_write(&cpi->pmutex[mb_row], current_mb_col, mb_col + nsync);
/* this is to account for the border */
xd->mode_info_context++;
@ -450,9 +454,6 @@ void vp8cx_init_mbrthread_data(VP8_COMP *cpi, MACROBLOCK *x,
mb->partition_info = x->pi + x->e_mbd.mode_info_stride * (i + 1);
mbd->mode_info_context = cm->mi + x->e_mbd.mode_info_stride * (i + 1);
mbd->mode_info_stride = cm->mode_info_stride;
mbd->frame_type = cm->frame_type;
mb->src = *cpi->Source;
@ -492,6 +493,8 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
cpi->encoding_thread_count = 0;
cpi->b_lpf_running = 0;
pthread_mutex_init(&cpi->mt_mutex, NULL);
if (cm->processor_core_count > 1 && cpi->oxcf.multi_threaded > 1) {
int ithread;
int th_count = cpi->oxcf.multi_threaded - 1;
@ -551,7 +554,7 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
if (rc) {
/* shutdown other threads */
cpi->b_multi_threaded = 0;
protected_write(&cpi->mt_mutex, &cpi->b_multi_threaded, 0);
for (--ithread; ithread >= 0; ithread--) {
pthread_join(cpi->h_encoding_thread[ithread], 0);
sem_destroy(&cpi->h_event_start_encoding[ithread]);
@ -565,6 +568,8 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
vpx_free(cpi->mb_row_ei);
vpx_free(cpi->en_thread_data);
pthread_mutex_destroy(&cpi->mt_mutex);
return -1;
}
@ -579,7 +584,7 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
if (rc) {
/* shutdown other threads */
cpi->b_multi_threaded = 0;
protected_write(&cpi->mt_mutex, &cpi->b_multi_threaded, 0);
for (--ithread; ithread >= 0; ithread--) {
sem_post(&cpi->h_event_start_encoding[ithread]);
sem_post(&cpi->h_event_end_encoding[ithread]);
@ -597,6 +602,8 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
vpx_free(cpi->mb_row_ei);
vpx_free(cpi->en_thread_data);
pthread_mutex_destroy(&cpi->mt_mutex);
return -2;
}
}
@ -605,9 +612,9 @@ int vp8cx_create_encoder_threads(VP8_COMP *cpi) {
}
void vp8cx_remove_encoder_threads(VP8_COMP *cpi) {
if (cpi->b_multi_threaded) {
if (protected_read(&cpi->mt_mutex, &cpi->b_multi_threaded)) {
/* shutdown other threads */
cpi->b_multi_threaded = 0;
protected_write(&cpi->mt_mutex, &cpi->b_multi_threaded, 0);
{
int i;
@ -635,5 +642,6 @@ void vp8cx_remove_encoder_threads(VP8_COMP *cpi) {
vpx_free(cpi->mb_row_ei);
vpx_free(cpi->en_thread_data);
}
pthread_mutex_destroy(&cpi->mt_mutex);
}
#endif

34
vp8/encoder/onyx_if.c
View File

@ -446,6 +446,18 @@ static void dealloc_compressor_data(VP8_COMP *cpi) {
cpi->mb.pip = 0;
#if CONFIG_MULTITHREAD
/* De-allocate mutex */
if (cpi->pmutex != NULL) {
VP8_COMMON *const pc = &cpi->common;
int i;
for (i = 0; i < pc->mb_rows; ++i) {
pthread_mutex_destroy(&cpi->pmutex[i]);
}
vpx_free(cpi->pmutex);
cpi->pmutex = NULL;
}
vpx_free(cpi->mt_current_mb_col);
cpi->mt_current_mb_col = NULL;
#endif
@ -1075,6 +1087,9 @@ void vp8_alloc_compressor_data(VP8_COMP *cpi) {
int width = cm->Width;
int height = cm->Height;
#if CONFIG_MULTITHREAD
int prev_mb_rows = cm->mb_rows;
#endif
if (vp8_alloc_frame_buffers(cm, width, height)) {
vpx_internal_error(&cpi->common.error, VPX_CODEC_MEM_ERROR,
@ -1164,6 +1179,25 @@ void vp8_alloc_compressor_data(VP8_COMP *cpi) {
}
if (cpi->oxcf.multi_threaded > 1) {
int i;
/* De-allocate and re-allocate mutex */
if (cpi->pmutex != NULL) {
for (i = 0; i < prev_mb_rows; ++i) {
pthread_mutex_destroy(&cpi->pmutex[i]);
}
vpx_free(cpi->pmutex);
cpi->pmutex = NULL;
}
CHECK_MEM_ERROR(cpi->pmutex,
vpx_malloc(sizeof(*cpi->pmutex) * cm->mb_rows));
if (cpi->pmutex) {
for (i = 0; i < cm->mb_rows; ++i) {
pthread_mutex_init(&cpi->pmutex[i], NULL);
}
}
vpx_free(cpi->mt_current_mb_col);
CHECK_MEM_ERROR(cpi->mt_current_mb_col,
vpx_malloc(sizeof(*cpi->mt_current_mb_col) * cm->mb_rows));

2
vp8/encoder/onyx_int.h
View File

@ -511,6 +511,8 @@ typedef struct VP8_COMP {
#if CONFIG_MULTITHREAD
/* multithread data */
pthread_mutex_t *pmutex;
pthread_mutex_t mt_mutex; /* mutex for b_multi_threaded */
int *mt_current_mb_col;
int mt_sync_range;
int b_multi_threaded;