use only 1 thread if m or n < 2*GEMM_MULTITHREAD_THRESHOLD

interface/trsm.c

@@ -362,6 +362,12 @@ void CNAME(enum CBLAS_ORDER order,
   mode |= (side  << BLAS_RSIDE_SHIFT);
 
   args.nthreads = num_cpu_avail(3);
+  if ( args.m < 2*GEMM_MULTITHREAD_THRESHOLD )
+	args.nthreads = 1;
+  else
+	if ( args.n < 2*GEMM_MULTITHREAD_THRESHOLD )
+		args.nthreads = 1;
+		
 
   if (args.nthreads == 1) {
 #endif