sync: use mfence on windows-tcc (#6079)

vlib/sync/bench/channel_bench_go.go

@@ -0,0 +1,68 @@
+package main
+
+import "fmt"
+import "log"
+import "os"
+import "time"
+import "strconv"
+
+func assert_eq(a, b int64) {
+	if a != b {
+		log.Fatalf("assertion failed\nleft: %d, right: %d\n", a, b)
+	}
+}
+
+func do_rec(ch chan int32, resch chan int64, n int32) {
+	var sum int64
+	var i int32
+	for i = 0; i < n; i++ {
+		sum += int64(<- ch)
+	}
+	fmt.Println(sum)
+	resch <- sum
+}
+
+func do_send(ch chan int32, start, end int32) {
+	for i := start; i < end; i++ {
+		ch <- i
+	}
+}
+
+func main() {
+	if len(os.Args) != 5 {
+		log.Fatalf("usage:\n\t%s <nsend> <nrec> <buflen> <nobj>\n", os.Args[0])
+	}
+	nsend, _ := strconv.Atoi(os.Args[1])
+	nrec, _ := strconv.Atoi(os.Args[2])
+	buflen, _ := strconv.Atoi(os.Args[3])
+	nobj, _ := strconv.Atoi(os.Args[4])
+	stopwatch := time.Now()
+	ch := make(chan int32, buflen)
+	resch := make(chan int64, 0)
+	no := nobj
+	for i := 0; i < nrec; i++ {
+		n := no / (nrec - i)
+		go do_rec(ch, resch, int32(n))
+		no -= n
+	}
+	assert_eq(int64(no), 0)	
+	no = nobj
+	for i := 0; i < nsend; i++ {
+		n := no / (nsend - i)
+		end := no
+		no -= n
+		go do_send(ch, int32(no), int32(end))
+	}
+	assert_eq(int64(no), 0)	
+	var sum int64
+	for i := 0; i < nrec; i++ {
+		sum += <-resch
+	}
+	elapsed := time.Now().Sub(stopwatch)
+	rate := float64(nobj)/float64(elapsed.Nanoseconds())*1000.0
+	duration := 1.0e-09 * float64(elapsed.Nanoseconds())
+	fmt.Printf("%d objects in %g s (%.2f objs/µs)\n", nobj, duration, rate)
+	expected_sum := int64(nobj)*int64(nobj-1)/2
+	fmt.Printf("got: %d, expected: %d\n", sum, expected_sum)
+	assert_eq(sum, expected_sum)
+}

vlib/sync/bench/channel_bench_v.v

@@ -0,0 +1,70 @@
+// Channel Benchmark
+//
+// `nobj` integers are sent thru a channel with queue length`buflen`
+// using `nsend` sender threads and `nrec` receiver threads.
+//
+// The receive threads add all received numbers and send them to the
+// main thread where the total sum is compare to the expected value.
+
+import sync
+import time
+import os
+
+fn do_rec(mut ch sync.Channel, mut resch sync.Channel, n int) {
+	mut sum := i64(0)
+	for _ in 0 .. n {
+		mut a := 0
+		ch.pop(&a)
+		sum += a
+	}
+	println(sum)
+	resch.push(&sum)
+}
+
+fn do_send(mut ch sync.Channel, start, end int) {
+	for i in start .. end {
+		ch.push(&i)
+	}
+}
+
+fn main() {
+	if os.args.len != 5 {
+		eprintln('usage:\n\t${os.args[0]} <nsend> <nrec> <buflen> <nobj>')
+		exit(1)
+	}
+	nsend := os.args[1].int()
+	nrec := os.args[2].int()
+	buflen := os.args[3].int()
+	nobj := os.args[4].int()
+	stopwatch := time.new_stopwatch({})
+	mut ch := sync.new_channel<int>(buflen)
+	mut resch := sync.new_channel<i64>(0)
+	mut no := nobj
+	for i in 0 .. nrec {
+		n := no / (nrec - i)
+		go do_rec(mut ch, mut resch, n)
+		no -= n
+	}
+	assert no == 0
+	no = nobj
+	for i in 0 .. nsend {
+		n := no / (nsend - i)
+		end := no
+		no -= n
+		go do_send(mut ch, no, end)
+	}
+	assert no == 0
+	mut sum := i64(0)
+	for _ in 0 .. nrec {
+		mut r := i64(0)
+		resch.pop(&r)
+		sum += r
+	}
+	elapsed := stopwatch.elapsed()
+	rate := f64(nobj)/elapsed*time.microsecond
+	println('$nobj objects in ${f64(elapsed)/time.second} s (${rate:.2f} objs/µs)')
+	// use sum formula by Gauß to calculate the expected result
+	expected_sum := i64(nobj)*(nobj-1)/2
+	println('got: $sum, expected: $expected_sum')
+	assert sum == expected_sum
+}