57 lines
1.2 KiB
V
57 lines
1.2 KiB
V
// Channel Benchmark
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//
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// `nobj` integers are sent thru a channel with queue length`buflen`
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// using `nsend` sender threads and `nrec` receiver threads.
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//
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// The receive threads add all received numbers and send them to the
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// main thread where the total sum is compare to the expected value.
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const (
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nsend = 2
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nrec = 2
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buflen = 100
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nobj = 10000
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objs_per_thread = 5000
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)
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fn do_rec(ch chan int, resch chan i64, n int) {
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mut sum := i64(0)
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for _ in 0 .. n {
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mut r := 0
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for ch.try_pop(mut r) != .success {
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}
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sum += r
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}
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println(sum)
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resch <- sum
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}
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fn do_send(ch chan int, start int, end int) {
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for i in start .. end {
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for ch.try_push(i) != .success {
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}
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}
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}
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fn test_channel_polling() {
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ch := chan int{cap: buflen}
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resch := chan i64{}
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for _ in 0 .. nrec {
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go do_rec(ch, resch, objs_per_thread)
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}
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mut n := nobj
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for _ in 0 .. nsend {
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end := n
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n -= objs_per_thread
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go do_send(ch, n, end)
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}
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mut sum := i64(0)
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for _ in 0 .. nrec {
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sum += <-resch
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println('> running sum: $sum')
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}
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// use sum formula by Gauß to calculate the expected result
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expected_sum := i64(nobj) * (nobj - 1) / 2
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println('expected sum: $expected_sum | sum: $sum')
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assert sum == expected_sum
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}
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