X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=lib%2FBenchmark.pm;h=b557be3cc7a6b900d168c10f2caf49422b08c004;hb=92dffb52e8549d6a194db47a2e5b989b8338a19a;hp=5157aad4a096ac66986522ba3523513b7f54151e;hpb=ce9550df90b6136a9e0c062522e2fe9d093f297a;p=p5sagit%2Fp5-mst-13.2.git

diff --git a/lib/Benchmark.pm b/lib/Benchmark.pm
index 5157aad..b557be3 100644
--- a/lib/Benchmark.pm
+++ b/lib/Benchmark.pm
@@ -435,7 +435,7 @@ sub timestr {
 			    $r,$pu,$ps,$pt) if $style eq 'noc';
     $s=sprintf("%2d wallclock secs (%$f cusr + %$f csys = %$f CPU)",
 			    $r,$cu,$cs,$ct) if $style eq 'nop';
-    $s .= sprintf(" @ %$f/s (n=$n)", $n / ( $pu + $ps )) if $pu + $ps;
+    $s .= sprintf(" @ %$f/s (n=$n)", $n / ( $pu + $ps )) if $n && $pu+$ps;
     $s;
 }
 
@@ -552,7 +552,9 @@ sub countit {
 	# accuracy since we're not couting these times.
 	$n = int( $tpra * 1.05 * $n / $tc ); # Linear approximation.
 	my $td = timeit($n, $code);
-	$tc = $td->[1] + $td->[2];
+	my $new_tc = $td->[1] + $td->[2];
+        # Make sure we are making progress.
+        $tc = $new_tc > 1.2 * $tc ? $new_tc : 1.2 * $tc;
     }
 
     # Now, do the 'for real' timing(s), repeating until we exceed
@@ -581,6 +583,7 @@ sub countit {
 	$ttot = $utot + $stot;
 	last if $ttot >= $tmax;
 
+        $ttot = 0.01 if $ttot < 0.01;
 	my $r = $tmax / $ttot - 1; # Linear approximation.
 	$n = int( $r * $ntot );
 	$n = $nmin if $n < $nmin;