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doc: add round-robin flag to io2010 balance example.

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R=r
CC=golang-dev
https://golang.org/cl/2050042
This commit is contained in:
Nigel Tao 2010-08-31 11:00:43 +10:00
parent 7a2daa7d3a
commit 724b66fb15
1 changed files with 6 additions and 2 deletions
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8
doc/talks/io2010/balance.go
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@ -6,6 +6,7 @@ package main
import ( import (
"container/heap" "container/heap"
"flag"
"fmt" "fmt"
"rand" "rand"
"time" "time"
@ -14,6 +15,8 @@ import (
const nRequester = 100 const nRequester = 100
const nWorker = 10 const nWorker = 10
var roundRobin = flag.Bool("r", false, "use round-robin scheduling")
// Simulation of some work: just sleep for a while and report how long. // Simulation of some work: just sleep for a while and report how long.
func op() int { func op() int {
n := rand.Int63n(1e9) n := rand.Int63n(1e9)
@ -125,7 +128,7 @@ func (b *Balancer) print() {
} }
func (b *Balancer) dispatch(req Request) { func (b *Balancer) dispatch(req Request) {
if false { if *roundRobin {
w := b.pool[b.i] w := b.pool[b.i]
w.requests <- req w.requests <- req
w.pending++ w.pending++
@ -144,7 +147,7 @@ func (b *Balancer) dispatch(req Request) {
} }
func (b *Balancer) completed(w *Worker) { func (b *Balancer) completed(w *Worker) {
if false { if *roundRobin {
w.pending-- w.pending--
return return
} }
@ -156,6 +159,7 @@ func (b *Balancer) completed(w *Worker) {
} }
func main() { func main() {
flag.Parse()
work := make(chan Request) work := make(chan Request)
for i := 0; i < nRequester; i++ { for i := 0; i < nRequester; i++ {
go requester(work) go requester(work)