Add -falseprecision flag for ludicrously precise stats

The normal round-to-three-significant-figures behaviour, while morally
correct from a benchmarking perspective, makes it impossible to measure
variances between runs of less than 1%.  Occasionally you really do need
to measure that finely - for example, if tweaking the server's main
dispatch loop.

Signed-off-by: Adam Jackson <ajax@redhat.com>

1 files changed, 7 insertions, 2 deletions

diff --git a/x11perf.c b/x11perf.c
index 389b04b..15eb04d 100644
--- a/x11perf.c
+++ b/x11perf.c
@@ -40,6 +40,7 @@ SOFTWARE.
 
 /* Only for working on ``fake'' servers, for hardware that doesn't exist */
 static Bool     drawToFakeServer = False;
+static Bool     falsePrecision  = False;
 static Pixmap   tileToQuery     = None;
 static char *displayName;
 int	abortTest;
@@ -249,9 +250,11 @@ RoundTo3Digits(double d)
 {
     /* It's kind of silly to print out things like ``193658.4/sec'' so just
        junk all but 3 most significant digits. */
-
     double exponent, sign;
 
+    if (falsePrecision)
+        return d;
+
     exponent = 1.0;
     /* the code below won't work if d should happen to be non-positive. */
     if (d < 0.0) {
@@ -974,10 +977,12 @@ main(int argc, char *argv[])
 	    foundOne = True;
 	} else if (strcmp (argv[i], "-sync") == 0) {
 	    synchronous = True;
-	} else if (strcmp(argv[i], "-pack") == 0) {
+	} else if (strcmp (argv[i], "-pack") == 0) {
 	    xparms.pack = True;
 	} else if (strcmp (argv[i], "-draw") == 0) {
 	    drawToFakeServer = True;
+        } else if (strcmp (argv[i], "-falseprecision") == 0) {
+            falsePrecision = True;
 	} else if (strcmp (argv[i], "-repeat") == 0) {
 	    i++;
 	    if (argc <= i)