Changeset: 4bf7d21f57fb for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=4bf7d21f57fb
Modified Files:
configure.ag
gdk/gdk_system.c
Branch: Dec2016
Log Message:
Use a potentially faster method of asking for the time.
GDKusec() is used to get some measure of how much time was spent since
some epoch. Using clock_gettime instead of gettimeofday significantly
boosts performance on FreeBSD and does no harm on Linux.
diffs (70 lines):
diff --git a/configure.ag b/configure.ag
--- a/configure.ag
+++ b/configure.ag
@@ -2543,6 +2543,7 @@ LIBS="$LIBS $MATH_LIBS"
AC_CHECK_FUNCS([\
asctime_r \
backtrace \
+ clock_gettime \
ctime_r \
fabsf \
fallocate \
diff --git a/gdk/gdk_system.c b/gdk/gdk_system.c
--- a/gdk/gdk_system.c
+++ b/gdk/gdk_system.c
@@ -895,16 +895,36 @@ GDKusec(void)
return (lng) (((ctr.QuadPart - start.QuadPart) * 1000000) /
freq.QuadPart);
}
#endif
+#ifdef HAVE_CLOCK_GETTIME
+#if defined(CLOCK_UPTIME_FAST)
+#define CLK_ID CLOCK_UPTIME_FAST /* FreeBSD */
+#elif defined(CLOCK_MONOTONIC_COARSE)
+#define CLK_ID CLOCK_MONOTONIC_COARSE /* Linux >= 2.6.32 */
+#else
+#define CLK_ID CLOCK_MONOTONIC /* Posix (fallback) */
+#endif
+ {
+ static struct timespec tsbase;
+ struct timespec ts;
+ if (tsbase.tv_sec == 0) {
+ clock_gettime(CLK_ID, &tsbase);
+ return tsbase.tv_nsec / 1000;
+ }
+ if (clock_gettime(CLK_ID, &ts) == 0)
+ return (ts.tv_sec - tsbase.tv_sec) * 1000000 +
ts.tv_nsec / 1000;
+ }
+#endif
#ifdef HAVE_GETTIMEOFDAY
{
static struct timeval tpbase; /* automatically initialized to
0 */
struct timeval tp;
- if (tpbase.tv_sec == 0)
+ if (tpbase.tv_sec == 0) {
gettimeofday(&tpbase, NULL);
+ return (lng) tpbase.tv_usec;
+ }
gettimeofday(&tp, NULL);
- tp.tv_sec -= tpbase.tv_sec;
- return (lng) tp.tv_sec * 1000000 + (lng) tp.tv_usec;
+ return (lng) (tp.tv_sec - tpbase.tv_sec) * 1000000 + (lng)
tp.tv_usec;
}
#else
#ifdef HAVE_FTIME
@@ -912,11 +932,12 @@ GDKusec(void)
static struct timeb tbbase; /* automatically initialized to
0 */
struct timeb tb;
- if (tbbase.time == 0)
+ if (tbbase.time == 0) {
ftime(&tbbase);
+ return (lng) tbbase.millitm * 1000;
+ }
ftime(&tb);
- tb.time -= tbbase.time;
- return (lng) tb.time * 1000000 + (lng) tb.millitm * 1000;
+ return (lng) (tb.time - tbbase.time) * 1000000 + (lng)
tb.millitm * 1000;
}
#endif
#endif
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