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Add missing barriers in gemm scheduler 

a few places in the gemm scheduler code were missing barriers;
the code likely worked OK due to heavy use of volatile / _Atomic
but there's no reason to get this incorrect
This commit is contained in:
Arjan van de Ven 2018-06-17 17:50:43 +00:00
parent 6eb4b9ae7c
commit 73de17664d
1 changed files with 4 additions and 3 deletions
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7
driver/level3/level3_thread.c
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@ -347,7 +347,7 @@ static int inner_thread(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
/* Make sure if no one is using workspace */
START_RPCC();
for (i = 0; i < args -> nthreads; i++)
while (job[mypos].working[i][CACHE_LINE_SIZE * bufferside]) {YIELDING;};
while (job[mypos].working[i][CACHE_LINE_SIZE * bufferside]) {YIELDING;MB;};
STOP_RPCC(waiting1);
#if defined(FUSED_GEMM) && !defined(TIMING)
@ -409,7 +409,7 @@ static int inner_thread(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
/* Wait until other region of B is initialized */
START_RPCC();
while(job[current].working[mypos][CACHE_LINE_SIZE * bufferside] == 0) {YIELDING;};
while(job[current].working[mypos][CACHE_LINE_SIZE * bufferside] == 0) {YIELDING;MB;};
STOP_RPCC(waiting2);
/* Apply kernel with local region of A and part of other region of B */
@ -427,6 +427,7 @@ static int inner_thread(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
/* Clear synchronization flag if this thread is done with other region of B */
if (m_to - m_from == min_i) {
job[current].working[mypos][CACHE_LINE_SIZE * bufferside] &= 0;
WMB;
}
}
} while (current != mypos);
@ -488,7 +489,7 @@ static int inner_thread(blas_arg_t *args, BLASLONG *range_m, BLASLONG *range_n,
START_RPCC();
for (i = 0; i < args -> nthreads; i++) {
for (js = 0; js < DIVIDE_RATE; js++) {
while (job[mypos].working[i][CACHE_LINE_SIZE * js] ) {YIELDING;};
while (job[mypos].working[i][CACHE_LINE_SIZE * js] ) {YIELDING;MB;};
}
}
STOP_RPCC(waiting3);