time tests; sort -nr times.out | sed 10q is illuminating.
cut the slowest tests  down from a few seconds
to under half a second.

R=r
DELTA=21  (6 added, 1 deleted, 14 changed)
OCL=35509
CL=35519
diff --git a/test/mallocrep.go b/test/mallocrep.go
index 6306e59..5367787 100644
--- a/test/mallocrep.go
+++ b/test/mallocrep.go
@@ -31,7 +31,7 @@
 func main() {
 	flag.Parse();
 	malloc.GetStats().Alloc = 0;	// ignore stacks
-	for i := 0; i < 1<<8; i++ {
+	for i := 0; i < 1<<7; i++ {
 		for j := 1; j <= 1<<22; j<<=1 {
 			if i == 0 && *chatty {
 				println("First alloc:", j);