Tune HASWELL SWITCH_RATIO as well

Similar to the SKYLAKEX patch, 32 seems to work best
(much better than 4 or 16)

Before (4)

   Matrix          SGEMM cycles    MPC                                   DGEMM cycles      MPC
  48 x 48               15554.3    7.2       0.2%                             30353.8      3.7       0.3%
  64 x 64               30346.8    8.7       1.6%                             63495.0      4.1      -0.1%
  65 x 65               81668.1    3.4    -123.3%                             82705.2      3.3     -21.2%
  80 x 80              105045.9    4.9     -95.5%                            115226.0      4.5      -2.2%
  96 x 96              152461.2    5.8     -74.3%                            148156.3      6.0      16.4%
 112 x 112             188505.2    7.5     -42.2%                            171187.3      8.2      36.4%
 128 x 128             257884.0    8.1     -39.5%                            224764.8      9.3      46.0%

Intermediate (16)

   Matrix          SGEMM cycles    MPC                                   DGEMM cycles      MPC
  48 x 48               15565.7    7.2       0.2%                             30378.9      3.7       0.2%
  64 x 64               30430.2    8.7       1.3%                             63046.4      4.2       0.6%
  65 x 65               27306.0   10.1      25.3%                             38879.2      7.1      43.0%
  80 x 80               51008.7   10.1       5.1%                             61007.6      8.4      45.9%
  96 x 96               70856.7   12.5      19.0%                             83403.1     10.6      53.0%
 112 x 112              84769.9   16.6      36.0%                             99920.1     14.1      62.9%
 128 x 128              84213.2   25.0      54.5%                            113024.2     18.6      72.8%

After (32)

   Matrix          SGEMM cycles    MPC                                   DGEMM cycles      MPC
  48 x 48               15537.3    7.2       0.3%                             30537.0      3.6      -0.3%
  64 x 64               30352.7    8.7       1.6%                             62597.8      4.2       1.3%
  65 x 65               36857.0    7.5      -0.8%                             56167.6      4.9      17.7%
  80 x 80               42552.6   12.1      20.8%                             69536.7      7.4      38.3%
  96 x 96               52101.5   17.1      40.5%                             91016.1      9.7      48.7%
 112 x 112              63853.7   22.1      51.8%                            110507.4     12.7      58.9%
 128 x 128              73966.1   28.4      60.0%                            163146.4     12.9      60.8%

diff --git a/param.h b/param.h
index 3573fff..cfa4bba 100644 (file)
--- a/param.h
+++ b/param.h
@@ -1507,7 +1507,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
 #define SYMV_P  8
 
-#define SWITCH_RATIO   4
+#define SWITCH_RATIO   32
 
 #ifdef ARCH_X86