tester

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Index

• Constants
• Variables

Constants

const BenchmarkSize = 128 * 1024 * 1024

Variables

var Tests = map[string]func([]string){
	"TestDelay": func(args []string) {
		mem, err := syscall.Mmap(0, 0, 256*4096, syscall.PROT_READ, syscall.MAP_PRIVATE)
		if err != nil {
			log.Fatal(err)
		}
		defer func() {
			if err := syscall.Munmap(mem); err != nil {
				log.Print(err)
			}
		}()

		for i := 0; i < 256; i++ {
			offset := i * 4096
			value := mem[offset]
			t := time.Now()

			fmt.Printf("%s: mem[0x%x] = %d\n", t, offset, value)

			if value != byte(i) {
				os.Exit(1)
			}
		}
	},

	"TestWrite": func(args []string) {
		flags, err := strconv.Atoi(args[0])
		if err != nil {
			log.Fatal(err)
		}

		mem, err := syscall.Mmap(0, 0, 256*4096, syscall.PROT_READ|syscall.PROT_WRITE, flags)
		if err != nil {
			log.Fatal(err)
		}
		defer func() {
			if err := syscall.Munmap(mem); err != nil {
				log.Print(err)
			}
		}()

		for i := 0; i < 256*4096; i++ {
			mem[i]++
		}
	},

	"TestHTTPGet": func(args []string) {
		length, err := strconv.Atoi(args[0])
		if err != nil {
			log.Fatal(err)
		}

		mem, err := syscall.Mmap(0, 0, length, syscall.PROT_READ, syscall.MAP_PRIVATE)
		if err != nil {
			log.Fatal(err)
		}
		defer syscall.Munmap(mem)

		image, err := jpeg.Decode(bytes.NewReader(mem))
		if err != nil {
			log.Fatal(err)
		}

		if filename := os.Getenv("TEST_HTTP_GET_OUTPUT"); filename != "" {
			f, err := os.Create(filename)
			if err != nil {
				log.Fatal(err)
			}
			defer f.Close()

			if err := png.Encode(f, image); err != nil {
				log.Fatal(err)
			}
		}
	},

	"BenchmarkSharedRead": func(args []string) {
		mem, err := syscall.Mmap(0, 0, BenchmarkSize, syscall.PROT_READ, syscall.MAP_SHARED)
		if err != nil {
			log.Fatal(err)
		}

		for i := 0; i < BenchmarkSize; i += 16 {
			runtime.KeepAlive(mem[i])
		}
	},

	"BenchmarkSharedWrite": func(args []string) {
		mem, err := syscall.Mmap(0, 0, BenchmarkSize, syscall.PROT_READ|syscall.PROT_WRITE, syscall.MAP_SHARED)
		if err != nil {
			log.Fatal(err)
		}

		for i := 0; i < BenchmarkSize; i += 16 {
			mem[i] = 1
		}
	},
}