[GNUnet-SVN] r6109 - GNUnet/src/util/threads

[gnunet]

Author: grothoff
Date: 2008-01-21 19:17:51 -0700 (Mon, 21 Jan 2008)
New Revision: 6109

Added:
   GNUnet/src/util/threads/timertimer.c
Modified:
   GNUnet/src/util/threads/Makefile.am
Log:
tit

Modified: GNUnet/src/util/threads/Makefile.am
===================================================================
--- GNUnet/src/util/threads/Makefile.am 2008-01-21 19:01:53 UTC (rev 6108)
+++ GNUnet/src/util/threads/Makefile.am 2008-01-22 02:17:51 UTC (rev 6109)
@@ -2,6 +2,8 @@
 
 SUBDIRS = .
 
+EXTRA_DIST = timertimer.c
+
 noinst_LTLIBRARIES = \
   libthreads.la
 

Added: GNUnet/src/util/threads/timertimer.c
===================================================================
--- GNUnet/src/util/threads/timertimer.c                                (rev 0)
+++ GNUnet/src/util/threads/timertimer.c        2008-01-22 02:17:51 UTC (rev 
6109)
@@ -0,0 +1,99 @@
+/**
+ * Program to check which timer function is fastest.
+ * Must be linked with "-lrt", only works on 686.
+ */
+
+#include <sys/times.h>
+#include <sys/time.h>
+#include <time.h>
+#include <unistd.h>
+#include <stdio.h>
+
+static unsigned long long ticks;
+
+static unsigned long long callibrate;
+
+static unsigned long long
+use_times ()
+{
+  struct tms t;
+  return times (&t) * 1000L / ticks;
+}
+
+static unsigned long long
+use_gtod ()
+{
+  struct timeval tv;
+  struct timezone tz;
+  gettimeofday (&tv, &tz);
+  return (((unsigned long long) tv.tv_sec) * 1000) + (tv.tv_usec / 1000);
+}
+
+static unsigned long long
+use_clock ()
+{
+  struct timespec ts;
+
+  clock_gettime (CLOCK_REALTIME, &ts);
+  return (((unsigned long long) ts.tv_sec) * 1000) + (ts.tv_nsec / 1000000);
+}
+
+static __inline__ unsigned long long
+rdtsc ()
+{
+  unsigned long long x;
+  __asm__ volatile ("rdtsc":"=A" (x));
+  return x;
+}
+
+static unsigned long long
+use_asm ()
+{
+  return rdtsc () / callibrate;
+}
+
+int
+main (int argc, char **argv)
+{
+  unsigned long long l;
+  unsigned long long start;
+  unsigned long long g_start;
+  unsigned long long cstart;
+
+  l = 0;
+  ticks = sysconf (_SC_CLK_TCK);
+  g_start = use_gtod ();
+  cstart = rdtsc ();
+  start = use_times ();
+  while ((use_times () - start) < 5 * 1000)
+    l++;
+  fprintf (stdout, "Could do %llu times calls in %llu ms\n", l,
+           use_gtod () - g_start);
+  callibrate = (rdtsc () - cstart) / 5000;
+
+  l = 0;
+  g_start = use_gtod ();
+  start = use_gtod ();
+  while ((use_gtod () - start) < 5 * 1000)
+    l++;
+  fprintf (stdout, "Could do %llu gtod  calls in %llu ms\n", l,
+           use_gtod () - g_start);
+
+  l = 0;
+  g_start = use_gtod ();
+  start = use_clock ();
+  while ((use_clock () - start) < 5 * 1000)
+    l++;
+  fprintf (stdout, "Could do %llu clock calls in %llu ms\n", l,
+           use_gtod () - g_start);
+
+  l = 0;
+  g_start = use_gtod ();
+  start = use_asm ();
+  while ((use_asm () - start) < 5 * 1000)
+    l++;
+  fprintf (stdout, "Could do %llu rdtsc calls in %llu ms\n", l,
+           use_gtod () - g_start);
+  return 0;
+
+}


Property changes on: GNUnet/src/util/threads/timertimer.c
___________________________________________________________________
Name: svn:eol-style
   + native