1 files changed, 43 insertions, 0 deletions
diff --git a/src/copyperf.cc b/src/copyperf.cc
new file mode 100644
index 0000000..2f9950a
--- /dev/null
+++ b/src/copyperf.cc
@@ -0,0 +1,43 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "vatoi.hh"
+#include "Timer.hh"
+
+int main(int argc,char *argv[]){
+  // compare speed of bcopy to character loop
+  if(argc<2){
+    puts("need to define buffer length");
+    exit(0);
+  }
+  long size = vatoi(argv[1]);
+  int ntimes = 1;
+  register int n;
+  register long i;
+  if(argc>2)
+    ntimes = vatoi(argv[2]);
+  printf("Buffer is %lu bytes %u times\n",size,ntimes);
+  Timer t1,t2;
+  char *dst = new char[size];
+  char *src = new char[size];
+  // prime the caches
+  for(i=0;i<size;i++){
+    src[i]=(char)(i%255);
+    dst[i]=0;
+  }
+  t1.start();
+  for(n=0;n<ntimes;n++) 
+    for(i=0;i<size;i++) 
+      dst[i]=src[i];
+  t1.stop();
+  t2.start();
+  for(n=0;n<ntimes;n++)
+    bcopy(src,dst,size);
+  t2.stop();
+  t1.print("Std copy timing: ");
+  t2.print("bcopy timing: ");
+  delete src;
+  delete dst;
+  return 1;
+}