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simplify threadring slightly; slight speed improvement

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R=rsc
DELTA=7  (3 added, 3 deleted, 1 changed)
OCL=32885
CL=32889
This commit is contained in:
Rob Pike 2009-08-07 13:30:20 -07:00
parent aa7bd48389
commit 5005fb46a2
2 changed files with 7 additions and 7 deletions
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11
test/bench/threadring.go
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@ -39,7 +39,6 @@ import (
"flag"; "flag";
"fmt"; "fmt";
"os"; "os";
"time";
) )
var n = flag.Int("n", 1000, "how many passes") var n = flag.Int("n", 1000, "how many passes")
@ -58,17 +57,15 @@ func f(i int, in <-chan int, out chan<- int) {
} }
func main() { func main() {
flag.Parse(); flag.Parse();
one := make(chan int); // will be input to thread 1 one := make(chan int); // will be input to thread 1
var in, out chan int = nil, one; var in, out chan int = nil, one;
for i := 1; i <= Nthread-1; i++ { for i := 1; i <= Nthread-1; i++ {
in, out = out, make(chan int); in, out = out, make(chan int);
go f(i, in, out); go f(i, in, out);
} }
go f(Nthread, out, one); go f(Nthread, out, one);
one <- *n; one <- *n;
for { <-make(chan int); // hang until ring completes
time.Sleep(100*1e9); // wait for ring to run
}
} }

3
test/bench/timing.log
View file

@ -120,3 +120,6 @@ threadring 50000000
gccgo -O2 threadring.go 90.33u 459.95s 448.03r gccgo -O2 threadring.go 90.33u 459.95s 448.03r
gc threadring 33.11u 0.00s 33.14r gc threadring 33.11u 0.00s 33.14r
GOMAXPROCS=4 gc threadring 114.48u 226.65s 371.59r GOMAXPROCS=4 gc threadring 114.48u 226.65s 371.59r
# change wait code to do <-make(chan int) instead of time.Sleep
gc threadring 28.41u 0.01s 29.35r
GOMAXPROCS=4 gc threadring 112.59u 232.83s 384.72r