[Assorted-commits] SF.net SVN: assorted:[1411] sandbox/trunk/src/cc/sync.cc

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

Revision: 1411
          http://assorted.svn.sourceforge.net/assorted/?rev=1411&view=rev
Author:   yangzhang
Date:     2009-05-13 16:55:10 +0000 (Wed, 13 May 2009)

Log Message:
-----------
added file sync demo

Added Paths:
-----------
    sandbox/trunk/src/cc/sync.cc

Added: sandbox/trunk/src/cc/sync.cc
===================================================================
--- sandbox/trunk/src/cc/sync.cc	                        (rev 0)
+++ sandbox/trunk/src/cc/sync.cc	2009-05-13 16:55:10 UTC (rev 1411)
@@ -0,0 +1,58 @@
+#include <unistd.h>
+#include <fstream>
+#include <commons/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+using namespace commons;
+using namespace std;
+enum { sz = 4096 };
+
+int main() {
+  char str[sz];
+  int fd = creat("/tmp/out", 0644);
+
+  {
+    long long start = current_time_millis();
+    int i;
+    for (i = 0; (i & 0xf) != 0xf || current_time_millis() - start < 1000; ++i) {
+      write(fd, str, sz);
+    }
+    long long end = current_time_millis();
+    cout << i << ' ' << end - start << endl;
+    fdatasync(fd);
+  }
+
+  {
+    long long start = current_time_millis();
+    int i;
+    for (i = 0; (i & 0xf) != 0xf || current_time_millis() - start < 1000; ++i) {
+      write(fd, str, sz);
+      fdatasync(fd);
+    }
+    long long end = current_time_millis();
+    cout << i << ' ' << end - start << endl;
+  }
+
+  {
+    long long start = current_time_millis();
+    int i;
+    for (i = 0; (i & 0xf) != 0xf || current_time_millis() - start < 1000; ++i) {
+      write(fd, str, sz);
+      long long s = current_time_millis();
+      fdatasync(fd);
+      cout << current_time_millis() - s << endl;
+    }
+    long long end = current_time_millis();
+    cout << i << ' ' << end - start << endl;
+  }
+
+#if 0
+  // Can't get the fd of an fstream.
+  ofstream of("/tmp/out");
+  of.write(str, sz);
+#endif
+
+  return 0;
+}


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