diff --git a/benchmark/mpblas/Makefile.am b/benchmark/mpblas/Makefile.am
index 59043fd7..2af2abe7 100644
--- a/benchmark/mpblas/Makefile.am
+++ b/benchmark/mpblas/Makefile.am
@@ -5,9 +5,9 @@ Rcopy1.plt.in Rcopy2.plt.in Rcopy3.plt.in \
 Rdot1.plt.in  Rdot2.plt.in  Rdot3.plt.in \
 Rgemm1.plt.in Rgemm2.plt.in Rgemm3.plt.in \
 Rgemm_cuda.plt.in \
-Rgemv1.plt Rgemv2.plt Rgemv3.plt \
-Rsyrk1.plt Rsyrk2.plt Rsyrk3.plt \
-Rsyrk_cuda.plt \
+Rgemv1.plt.in Rgemv2.plt.in Rgemv3.plt.in \
+Rsyrk1.plt.in Rsyrk2.plt.in Rsyrk3.plt.in \
+Rsyrk_cuda.plt.in \
 go.Raxpy.sh go.Rcopy.sh go.Rdot.sh go.Rgemm.sh \
 go.Rgemm_cuda.sh \
 go.Rgemv.sh go.Rsyrk.sh \
diff --git a/benchmark/mpblas/Rgemm3.plt.in b/benchmark/mpblas/Rgemm3.plt.in
index 712da8e6..c686fdd1 100644
--- a/benchmark/mpblas/Rgemm3.plt.in
+++ b/benchmark/mpblas/Rgemm3.plt.in
@@ -12,4 +12,4 @@ plot \
 "log.Rgemm.double_opt"	    using 1:4 title 'double (OpenMP)'        with lines linewidth 1, \
 "log.Rgemm.double"          using 1:4 title 'double'                 with lines linewidth 1, \
 "log.dgemm.ref"	            using 1:4 title 'double (Ref.BLAS)'      with lines linewidth 1, \
-"log.dgemm.openblas"        using 1:4 title 'double (OpenBLAS)'      with lines linewidth 1
\ No newline at end of file
+"log.dgemm.openblas"        using 1:4 title 'double (OpenBLAS)'      with lines linewidth 1
diff --git a/benchmark/mpblas/Rgemv.cpp b/benchmark/mpblas/Rgemv.cpp
index 26b4ee23..867fb2bf 100644
--- a/benchmark/mpblas/Rgemv.cpp
+++ b/benchmark/mpblas/Rgemv.cpp
@@ -111,7 +111,6 @@ int main(int argc, char *argv[]) {
             return 1;
         }
     }
-
     n = N0;
     m = M0;
     for (p = 0; p < TOTALSTEPS; p++) {
@@ -125,7 +124,7 @@ int main(int argc, char *argv[]) {
         REAL *x = new REAL[k];
         REAL *y = new REAL[l];
         REAL *yref = new REAL[l];
-        REAL *A = new REAL[n * m];
+        REAL *a = new REAL[n * m];
         if (check_flag) {
             for (i = 0; i < k; i++) {
                 x[i] = randomnumber(dummy);
@@ -134,12 +133,12 @@ int main(int argc, char *argv[]) {
                 y[i] = yref[i] = randomnumber(dummy);
             }
             for (i = 0; i < k * l; i++) {
-                A[i] = randomnumber(dummy);
+                a[i] = randomnumber(dummy);
             }
             alpha = randomnumber(dummy);
             beta = randomnumber(dummy);
             auto t1 = Clock::now();
-            Rgemv(&trans, m, n, alpha, A, m, x, (mplapackint)1, beta, y, (mplapackint)1);
+            Rgemv(&trans, m, n, alpha, a, m, x, (mplapackint)1, beta, y, (mplapackint)1);
             auto t2 = Clock::now();
             elapsedtime = (double)duration_cast<nanoseconds>(t2 - t1).count() / 1.0e9;
             (*mpblas_ref)(&trans, m, n, alpha, A, m, x, (mplapackint)1, beta, yref, (mplapackint)1);
@@ -156,14 +155,14 @@ int main(int argc, char *argv[]) {
                 y[i] = yref[i] = randomnumber(dummy);
             }
             for (i = 0; i < k * l; i++) {
-                A[i] = randomnumber(dummy);
+                a[i] = randomnumber(dummy);
             }
             alpha = randomnumber(dummy);
             beta = randomnumber(dummy);
             elapsedtime = 0.0;
             for (int j = 0; j < LOOP; j++) {
                 auto t1 = Clock::now();
-                Rgemv(&trans, m, n, alpha, A, m, x, (mplapackint)1, beta, y, (mplapackint)1);
+                Rgemv(&trans, m, n, alpha, a, m, x, (mplapackint)1, beta, y, (mplapackint)1);
                 auto t2 = Clock::now();
                 elapsedtime = elapsedtime + (double)duration_cast<nanoseconds>(t2 - t1).count() / 1.0e9;
             }
@@ -174,7 +173,7 @@ int main(int argc, char *argv[]) {
         delete[] yref;
         delete[] y;
         delete[] x;
-        delete[] A;
+        delete[] a;
         n = n + STEPN;
         m = m + STEPM;
     }
diff --git a/benchmark/mpblas/Rgemv1.plt b/benchmark/mpblas/Rgemv1.plt.in
similarity index 82%
rename from benchmark/mpblas/Rgemv1.plt
rename to benchmark/mpblas/Rgemv1.plt.in
index fba30ef1..3f3b9dff 100644
--- a/benchmark/mpblas/Rgemv1.plt
+++ b/benchmark/mpblas/Rgemv1.plt.in
@@ -5,7 +5,7 @@ set title font "Helvetica,20"
 set title "Rgemv on %%MODELNAME%%"
 set xlabel "Dimension"
 set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
+set key above
 set terminal pdf
 
 plot \
@@ -14,6 +14,5 @@ plot \
 "log.Rgemv._Float64x"       using 1:3 title '\_Float64x'             with lines linewidth 1, \
 "log.Rgemv._Float64x_opt"   using 1:3 title '\_Float64x (OpenMP)'    with lines linewidth 1, \
 "log.Rgemv.dd"              using 1:3 title 'double double'          with lines linewidth 1, \
-"log.Rgemv.dd_opt"          using 1:3 title 'double double (OpenMP)' with lines linewidth 1, \
-"log.Rgemv.double"          using 1:3 title 'double'                 with lines linewidth 1
+"log.Rgemv.dd_opt"          using 1:3 title 'double double (OpenMP)' with lines linewidth 1
 
diff --git a/benchmark/mpblas/Rgemv2.plt b/benchmark/mpblas/Rgemv2.plt.in
similarity index 94%
rename from benchmark/mpblas/Rgemv2.plt
rename to benchmark/mpblas/Rgemv2.plt.in
index 99004d57..c08ba755 100644
--- a/benchmark/mpblas/Rgemv2.plt
+++ b/benchmark/mpblas/Rgemv2.plt.in
@@ -5,7 +5,7 @@ set title font "Helvetica,20"
 set title "Rgemv on %%MODELNAME%%"
 set xlabel "Dimension"
 set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
+set key above
 set terminal pdf
 
 plot \
diff --git a/benchmark/mpblas/Rgemv3.plt b/benchmark/mpblas/Rgemv3.plt
deleted file mode 100644
index 9aa2c643..00000000
--- a/benchmark/mpblas/Rgemv3.plt
+++ /dev/null
@@ -1,11 +0,0 @@
-set xlabel font "Helvetica,20"
-set ylabel font "Helvetica,20"
-set key font "Helvetica,16"
-set title font "Helvetica,20"
-set title "Rgemv on %%MODELNAME%%"
-set xlabel "Dimension"
-set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
-set terminal pdf
-
-plot "log.Rgemv.double_opt"	    using 1:3 title 'double (OpenMP)'     with lines linewidth 1
\ No newline at end of file
diff --git a/benchmark/mpblas/Rgemv3.plt.in b/benchmark/mpblas/Rgemv3.plt.in
new file mode 100644
index 00000000..a6eaca06
--- /dev/null
+++ b/benchmark/mpblas/Rgemv3.plt.in
@@ -0,0 +1,15 @@
+set xlabel font "Helvetica,20"
+set ylabel font "Helvetica,20"
+set key font "Helvetica,16"
+set title font "Helvetica,20"
+set title "Rgemv on %%MODELNAME%%"
+set xlabel "Dimension"
+set ylabel "MFLOPS"
+set key above
+set terminal pdf
+
+plot \
+"log.Rgemv.double_opt"	    using 1:3 title 'double (OpenMP)'     with lines linewidth 1, \
+"log.Rgemv.double"          using 1:3 title 'double'              with lines linewidth 1, \
+"log.dgemv.ref"             using 1:3 title 'double (Ref.BLAS)'   with lines linewidth 1, \
+"log.dgemv.openblas"        using 1:3 title 'double (OpenBLAS)'   with lines linewidth 1
diff --git a/benchmark/mpblas/Rsyrk1.plt b/benchmark/mpblas/Rsyrk1.plt.in
similarity index 81%
rename from benchmark/mpblas/Rsyrk1.plt
rename to benchmark/mpblas/Rsyrk1.plt.in
index 3cc8b1e9..87750b22 100644
--- a/benchmark/mpblas/Rsyrk1.plt
+++ b/benchmark/mpblas/Rsyrk1.plt.in
@@ -5,7 +5,7 @@ set title font "Helvetica,20"
 set title "Rsyrk on %%MODELNAME%%"
 set xlabel "Dimension"
 set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
+set key above
 set terminal pdf
 
 plot \
@@ -14,6 +14,4 @@ plot \
 "log.Rsyrk._Float64x"       using 1:3 title '\_Float64x'             with lines linewidth 1, \
 "log.Rsyrk._Float64x_opt"   using 1:3 title '\_Float64x (OpenMP)'    with lines linewidth 1, \
 "log.Rsyrk.dd"              using 1:3 title 'double double'          with lines linewidth 1, \
-"log.Rsyrk.dd_opt"          using 1:3 title 'double double (OpenMP)' with lines linewidth 1, \
-"log.Rsyrk.double"          using 1:3 title 'double'                 with lines linewidth 1
-
+"log.Rsyrk.dd_opt"          using 1:3 title 'double double (OpenMP)' with lines linewidth 1
diff --git a/benchmark/mpblas/Rsyrk2.plt b/benchmark/mpblas/Rsyrk2.plt.in
similarity index 94%
rename from benchmark/mpblas/Rsyrk2.plt
rename to benchmark/mpblas/Rsyrk2.plt.in
index 8057bee2..06992e57 100644
--- a/benchmark/mpblas/Rsyrk2.plt
+++ b/benchmark/mpblas/Rsyrk2.plt.in
@@ -5,7 +5,7 @@ set title font "Helvetica,20"
 set title "Rsyrk on %%MODELNAME%%"
 set xlabel "Dimension"
 set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
+set key above
 set terminal pdf
 
 plot \
diff --git a/benchmark/mpblas/Rsyrk3.plt b/benchmark/mpblas/Rsyrk3.plt
deleted file mode 100644
index bed71309..00000000
--- a/benchmark/mpblas/Rsyrk3.plt
+++ /dev/null
@@ -1,12 +0,0 @@
-set xlabel font "Helvetica,20"
-set ylabel font "Helvetica,20"
-set key font "Helvetica,16"
-set title font "Helvetica,20"
-set title "Rsyrk on %%MODELNAME%%"
-set xlabel "Dimension"
-set ylabel "MFLOPS"
-#set terminal postscript eps color enhanced
-set terminal pdf
-
-plot \
-"log.Rsyrk.double_opt"	    using 1:3 title 'double (OpenMP)'        with lines linewidth 1
diff --git a/benchmark/mpblas/Rsyrk3.plt.in b/benchmark/mpblas/Rsyrk3.plt.in
new file mode 100644
index 00000000..cd3397e4
--- /dev/null
+++ b/benchmark/mpblas/Rsyrk3.plt.in
@@ -0,0 +1,15 @@
+set xlabel font "Helvetica,20"
+set ylabel font "Helvetica,20"
+set key font "Helvetica,16"
+set title font "Helvetica,20"
+set title "Rsyrk on %%MODELNAME%%"
+set xlabel "Dimension"
+set ylabel "MFLOPS"
+set key above
+set terminal pdf
+
+plot \
+"log.Rsyrk.double_opt"	    using 1:3 title 'double (OpenMP)'        with lines linewidth 1, \
+"log.Rsyrk.double"          using 1:3 title 'double'                 with lines linewidth 1, \
+"log.dsyrk.ref"	            using 1:3 title 'double (Ref.BLAS)'      with lines linewidth 1, \
+"log.dsyrk.openblas"        using 1:3 title 'double (OpenBLAS)'      with lines linewidth 1
diff --git a/benchmark/mpblas/dgemv.cpp b/benchmark/mpblas/dgemv.cpp
index 2f8f77c9..23c6576d 100644
--- a/benchmark/mpblas/dgemv.cpp
+++ b/benchmark/mpblas/dgemv.cpp
@@ -35,11 +35,21 @@
 #define ___DOUBLE_BENCH___
 #include <mplapack_benchmark.h>
 
-#define TOTALSTEPS 1000
+// cf. https://netlib.org/lapack/lawnspdf/lawn41.pdf p.120
+double flops_gemv(int m_i, int n_i) {
+    double adds, muls, flops;
+    double n, m;
+    n = (double)n_i;
+    m = (double)m_i;
+    muls = m * n + 2. * m;
+    adds = m * n;
+    flops = muls + adds;
+    return flops;
+}
 
 int main(int argc, char *argv[]) {
     int k, l, m, n;
-    int incx = 1, incy = 1, STEPN, STEPM, N0, M0;
+    int STEPN = 7, STEPM = 7, N0, M0, LOOP = 3, TOTALSTEPS = 283;
     double alpha, beta, dummy, *dummywork;
     double mOne = -1;
     double elapsedtime, t1, t2;
@@ -52,9 +62,6 @@ int main(int argc, char *argv[]) {
 
     // initialization
     N0 = M0 = 1;
-    STEPN = STEPM = 1;
-    trans = 'n';
-    normtype = 'm';
     if (argc != 1) {
         for (i = 1; i < argc; i++) {
             if (strcmp("-N", argv[i]) == 0) {
@@ -67,6 +74,10 @@ int main(int argc, char *argv[]) {
                 STEPM = atoi(argv[++i]);
             } else if (strcmp("-T", argv[i]) == 0) {
                 trans = 't';
+            } else if (strcmp("-LOOPS", argv[i]) == 0) {
+                LOOPS = atoi(argv[++i]);
+            } else if (strcmp("-TOTALSTEPS", argv[i]) == 0) {
+                TOTALSTEPS = atoi(argv[++i]);
             }
         }
     }
@@ -82,7 +93,7 @@ int main(int argc, char *argv[]) {
         }
         double *x = new double[k];
         double *y = new double[l];
-        double *A = new double[n * m];
+        double *a = new double[n * m];
         for (i = 0; i < k; i++) {
             x[i] = randomnumber(dummy);
         }
@@ -90,19 +101,23 @@ int main(int argc, char *argv[]) {
             y[i] = randomnumber(dummy);
         }
         for (i = 0; i < k * l; i++) {
-            A[i] = randomnumber(dummy);
+            a[i] = randomnumber(dummy);
         }
         alpha = randomnumber(dummy);
         beta = randomnumber(dummy);
-        auto t1 = Clock::now();
-        dgemv_f77(&trans, &m, &n, &alpha, A, &m, x, &incx, &beta, y, &incy);
-        auto t2 = Clock::now();
-        elapsedtime = (double)duration_cast<nanoseconds>(t2 - t1).count() / 1.0e9;
+        elapsedtime = 0.0;
+        for (int j = 0; j < LOOPS; j++) {
+            auto t1 = Clock::now();
+            dgemv_f77(&trans, &m, &n, &alpha, a, &m, x, &incx, &beta, y, &incy);
+            auto t2 = Clock::now();
+            elapsedtime = elapsedtime + (double)duration_cast<nanoseconds>(t2 - t1).count() / 1.0e9;
+        }
+        elapsedtime = elapsedtime / (double)LOOPS;
         printf("     m       n      MFLOPS  trans\n");
-        printf("%6d  %6d  %10.3f      %c\n", (int)n, (int)m, (2.0 * (double)n * (double)m) / elapsedtime * MFLOPS, trans);
+        printf("%6d  %6d  %10.3f      %c\n", (int)n, (int)m, flops_gemv(m, n) / elapsedtime * MFLOPS, trans);
         delete[] y;
         delete[] x;
-        delete[] A;
+        delete[] a;
         n = n + STEPN;
         m = m + STEPM;
     }
diff --git a/benchmark/mpblas/go.Rgemm.sh b/benchmark/mpblas/go.Rgemm.sh
index e4055f96..b6e30756 100644
--- a/benchmark/mpblas/go.Rgemm.sh
+++ b/benchmark/mpblas/go.Rgemm.sh
@@ -38,9 +38,9 @@ else
     MODELNAME="unknown"
 fi
 
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm1.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm2.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm3.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm1.plt.in > Rgemm1.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm2.plt.in > Rgemm2.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemm3.plt.in > Rgemm3.plt
 ####
 
 gnuplot Rgemm1.plt > Rgemm1.pdf
diff --git a/benchmark/mpblas/go.Rgemm_cuda.sh b/benchmark/mpblas/go.Rgemm_cuda.sh
index 5c545b58..ebc91ee9 100644
--- a/benchmark/mpblas/go.Rgemm_cuda.sh
+++ b/benchmark/mpblas/go.Rgemm_cuda.sh
@@ -18,6 +18,6 @@ else
     MODELNAME="unknown"
 fi
 
-$SED -i -e "s/%%GPU%%/$MODELNAME/g" Rgemm_cuda.plt.in > Rgemm_cuda.plt
+$SED -e "s/%%GPU%%/$MODELNAME/g" Rgemm_cuda.plt.in > Rgemm_cuda.plt
 
 gnuplot Rgemm_cuda.plt > Rgemm_cuda.pdf
diff --git a/benchmark/mpblas/go.Rgemv.sh b/benchmark/mpblas/go.Rgemv.sh
index 9043d572..495f7c85 100644
--- a/benchmark/mpblas/go.Rgemv.sh
+++ b/benchmark/mpblas/go.Rgemv.sh
@@ -6,6 +6,9 @@ else
     LDPATHPREFIX="LD_LIBRARY_PATH=%%PREFIX%%/lib:$LD_LIBRARY_PATH"
 fi
 
+env $LDPATHPREFIX ./dgemv_ref       >& log.dgemv.ref
+env $LDPATHPREFIX ./dgemv_openblas  >& log.dgemv.openblas
+
 ####
 MPLIBS="_Float128 _Float64x dd double"
 
@@ -35,9 +38,9 @@ else
     MODELNAME="unknown"
 fi
 
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv1.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv2.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv3.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv1.plt.in > Rgemv1.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv2.plt.in > Rgemv2.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rgemv3.plt.in > Rgemv3.plt
 ####
 
 gnuplot Rgemv1.plt > Rgemv1.pdf
diff --git a/benchmark/mpblas/go.Rsyrk.sh b/benchmark/mpblas/go.Rsyrk.sh
index 7de10bcd..0042fc20 100644
--- a/benchmark/mpblas/go.Rsyrk.sh
+++ b/benchmark/mpblas/go.Rsyrk.sh
@@ -35,9 +35,9 @@ else
     MODELNAME="unknown"
 fi
 
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk1.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk2.plt
-$SED -i -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk3.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk1.plt.in > Rsyrk1.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk2.plt.in > Rsyrk2.plt
+$SED -e "s/%%MODELNAME%%/$MODELNAME/g" Rsyrk3.plt.in > Rsyrk3.plt
 ####
 
 gnuplot Rsyrk1.plt > Rsyrk1.pdf