Increase multithreading threshold by a factor of 50

Author: martin-frbg

interface/gemv.c

@@ -226,7 +226,7 @@ void CNAME(enum CBLAS_ORDER order,
 
 #ifdef SMP
 
-  if ( 1L * m * n < 2304L * GEMM_MULTITHREAD_THRESHOLD )
+  if ( 1L * m * n < 115200L * GEMM_MULTITHREAD_THRESHOLD )
     nthreads = 1;
   else
     nthreads = num_cpu_avail(2);