diff --git a/newbrt/brt.h b/newbrt/brt.h
index acc78f4bfaf..93fd20d5d1e 100644
--- a/newbrt/brt.h
+++ b/newbrt/brt.h
@@ -213,6 +213,8 @@ int toku_brt_zombie_needed (BRT brt);
 
 int toku_brt_get_fragmentation(BRT brt, TOKU_DB_FRAGMENTATION report);
 
+double get_tdiff(void) __attribute__((__visibility__("default")));
+
 //TODO: #1485 once we have multiple main threads, restore this code, analyze performance.
 #ifndef TOKU_MULTIPLE_MAIN_THREADS
 #define TOKU_MULTIPLE_MAIN_THREADS 0
diff --git a/newbrt/logger.c b/newbrt/logger.c
index 04e5e5cf113..d689a0a3e5d 100644
--- a/newbrt/logger.c
+++ b/newbrt/logger.c
@@ -582,6 +582,20 @@ void toku_logger_trim_log_files (TOKULOGGER logger, BOOL trim_log_files)
     logger->trim_log_files = trim_log_files;
 }
 
+double get_tdiff(void) {
+    static struct timeval prev={0,0};
+    if (prev.tv_sec==0) {
+	gettimeofday(&prev, 0);
+	return 0.0;
+    } else {
+	struct timeval now;
+	gettimeofday(&now, 0);
+	double diff = now.tv_sec - prev.tv_sec + 1e-6*(now.tv_usec - prev.tv_usec);
+	prev = now;
+	return diff;
+    }
+}
+
 int toku_logger_maybe_fsync (TOKULOGGER logger, LSN lsn, int do_fsync)
 // Effect: If fsync is nonzero, then make sure that the log is flushed and synced at least up to lsn.
 // Entry: Holds input lock.  The log entry has already been written to the input buffer.
diff --git a/src/export.map b/src/export.map
index ea362186206..06ecd78e9ef 100644
--- a/src/export.map
+++ b/src/export.map
@@ -65,6 +65,9 @@
    toku_set_assert_on_write_enospc;
 
    test_db_redirect_dictionary;
+
+   get_tdiff;
+
  local: *;
 };
 
diff --git a/src/tests/test_groupcommit_count.c b/src/tests/test_groupcommit_count.c
index 656f2a77e7e..4d74b898dff 100644
--- a/src/tests/test_groupcommit_count.c
+++ b/src/tests/test_groupcommit_count.c
@@ -83,8 +83,11 @@ get_fsync_count (void) {
 
 static int
 do_fsync (int fd) {
+    //fprintf(stderr, "%8.6fs Thread %ld start fsyncing\n", get_tdiff(), pthread_self());
     inc_fsync_count();
-    return fsync(fd);
+    int r = fsync(fd);
+    //fprintf(stderr, "%8.6fs Thread %ld done  fsyncing\n", get_tdiff(), pthread_self());
+    return r;
 }
 
 static const char *progname;