[Assorted-commits] SF.net SVN: assorted:[1397] rand-dist/trunk/src

[<yan...@us...>]

Revision: 1397
          http://assorted.svn.sourceforge.net/assorted/?rev=1397&view=rev
Author:   yangzhang
Date:     2009-05-07 07:46:35 +0000 (Thu, 07 May 2009)

Log Message:
-----------
added randspeed to compare performance of rand impls

Modified Paths:
--------------
    rand-dist/trunk/src/Makefile
    rand-dist/trunk/src/randdist.cc

Added Paths:
-----------
    rand-dist/trunk/src/randspeed.cc

Modified: rand-dist/trunk/src/Makefile
===================================================================
--- rand-dist/trunk/src/Makefile	2009-05-07 07:44:39 UTC (rev 1396)
+++ rand-dist/trunk/src/Makefile	2009-05-07 07:46:35 UTC (rev 1397)
@@ -1,2 +1,2 @@
 CFLAGS := -Wall -O3
-all: randdist
+all: randdist randspeed

Modified: rand-dist/trunk/src/randdist.cc
===================================================================
--- rand-dist/trunk/src/randdist.cc	2009-05-07 07:44:39 UTC (rev 1396)
+++ rand-dist/trunk/src/randdist.cc	2009-05-07 07:46:35 UTC (rev 1397)
@@ -16,6 +16,8 @@
   const int size = atoi(argv[1]);
   const int count = atoi(argv[2]);
 
+  posix_rand r;
+
   vector<int> xs(size);
   for (int i = 0; i < count; i++) {
     xs[i] = r();

Added: rand-dist/trunk/src/randspeed.cc
===================================================================
--- rand-dist/trunk/src/randspeed.cc	                        (rev 0)
+++ rand-dist/trunk/src/randspeed.cc	2009-05-07 07:46:35 UTC (rev 1397)
@@ -0,0 +1,29 @@
+#include <commons/rand.h>
+#include <commons/time.h>
+#include <iostream>
+using namespace commons;
+using namespace std;
+
+int count;
+
+template<typename T>
+void exp(T r, const string &name)
+{
+  int x = 0;
+  long long start = current_time_millis();
+  for (int i = 0; i < count; ++i) x |= r();
+  long long diff = current_time_millis() - start;
+  cout << name << ": " << diff << " ms or "
+       << 1000 * count / double(diff) << " r/s; " << hex << x << endl;
+}
+
+int main(int argc, char **argv) {
+  if (argc < 2) {
+    cerr << "randspeed COUNT" << endl;
+    return 1;
+  }
+  count = atoi(argv[1]);
+  exp(posix_rand(), "posix_rand");
+  exp(&random, "random");
+  return 0;
+}


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