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disable threading in C/ZSWAP copying from S/DSWAP

This commit is contained in:
Andrew 2018-10-22 23:21:49 +03:00
parent a293bdcd5e
commit 2992e3886a
1 changed files with 9 additions and 1 deletions
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10
interface/zswap.c
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@ -42,6 +42,14 @@
#include "functable.h"
#endif
#if defined(THUNDERX2T99) || defined(VULCAN) || defined(ARMV8)
// Multithreaded swap gives performance benefits in ThunderX2T99
#else
// Disable multi-threading as it does not show any performance
// benefits. Keep the multi-threading code for the record.
#undef SMP
#endif
#ifndef CBLAS
void NAME(blasint *N, FLOAT *x, blasint *INCX, FLOAT *y, blasint *INCY){
@ -81,7 +89,7 @@ FLOAT *y = (FLOAT*)vy;
#ifdef SMP
//disable multi-thread when incx==0 or incy==0
//In that case, the threads would be dependent.
if (incx == 0 || incy == 0)
if (incx == 0 || incy == 0 || n < 1048576 * GEMM_MULTITHREAD_THRESHOLD / sizeof(FLOAT))
nthreads = 1;
else
nthreads = num_cpu_avail(1);