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machine.go
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machine.go
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package main
import (
"./vaas"
gouuid "github.com/google/uuid"
"bufio"
"fmt"
"log"
"io"
"net/http"
"os"
"os/exec"
"runtime"
"strings"
"sync"
)
func main() {
if len(os.Args) < 4 {
fmt.Println("usage: ./machine [external IP] [port] [coordinator URL] [CUDA GPU list]")
fmt.Println("example: ./machine localhost 8081 http://localhost:8080 0,1")
return
}
myIP := os.Args[1]
port := vaas.ParseInt(os.Args[2])
coordinatorURL := os.Args[3]
gpulist := strings.Split(os.Args[4], ",")
// set gpulist correctly if it's empty
if len(gpulist) == 1 && gpulist[0] == "" {
gpulist = nil
}
type Cmd struct {
cmd *exec.Cmd
stdin io.WriteCloser
gpuIndexes []int
}
containers := make(map[string]Cmd)
var mu sync.Mutex
// indexes in gpulist that are in use
gpusInUse := make(map[int]bool)
for i := range gpulist {
gpusInUse[i] = false
}
getGPUs := func(num int) ([]int, string, error) {
var gpuIndexes []int
for i := 0; i < num; i++ {
var freeGPUIdx int = -1
for idx, used := range gpusInUse {
if used {
continue
}
freeGPUIdx = idx
break
}
if freeGPUIdx == -1 {
return nil, "", fmt.Errorf("insufficient idle GPUs")
}
gpuIndexes = append(gpuIndexes, freeGPUIdx)
}
var gpus []string
for _, idx := range gpuIndexes {
gpusInUse[idx] = true
gpus = append(gpus, gpulist[idx])
}
cudaStr := "CUDA_VISIBLE_DEVICES=" + strings.Join(gpus, ",")
return gpuIndexes, cudaStr, nil
}
http.HandleFunc("/allocate", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(404)
return
}
var request vaas.Environment
if err := vaas.ParseJsonRequest(w, r, &request); err != nil {
return
}
uuid := gouuid.New().String()
cmd := exec.Command("./container", uuid, coordinatorURL)
// assign GPUs if needed
var gpuIndexes []int
if request.Requirements["gpu"] > 0 {
var cudaStr string
var err error
gpuIndexes, cudaStr, err = getGPUs(request.Requirements["gpu"])
if err != nil {
http.Error(w, err.Error(), 400)
return
}
for _, env := range os.Environ() {
if !strings.Contains(env, "CUDA_VISIBLE_DEVICES") {
cmd.Env = append(cmd.Env, env)
}
}
cmd.Env = append(cmd.Env, cudaStr)
}
stdin, err := cmd.StdinPipe()
if err != nil {
panic(err)
}
stdout, err := cmd.StdoutPipe()
if err != nil {
panic(err)
}
cmd.Stderr = os.Stderr
if err := cmd.Start(); err != nil {
panic(err)
}
log.Printf("[machine] container %s started (gpus=%v)", uuid, gpuIndexes)
mu.Lock()
containers[uuid] = Cmd{
cmd: cmd,
stdin: stdin,
gpuIndexes: gpuIndexes,
}
mu.Unlock()
rd := bufio.NewReader(stdout)
line, err := rd.ReadString('\n')
if err != nil {
panic(err)
}
port := vaas.ParseInt(strings.TrimSpace(line))
vaas.JsonResponse(w, vaas.Container{
UUID: uuid,
BaseURL: fmt.Sprintf("http://%s:%d", myIP, port),
})
})
http.HandleFunc("/deallocate", func(w http.ResponseWriter, r *http.Request) {
if r.Method != "POST" {
w.WriteHeader(404)
return
}
r.ParseForm()
uuid := r.Form.Get("uuid")
mu.Lock()
cmd, ok := containers[uuid]
if ok {
cmd.stdin.Close()
cmd.cmd.Wait()
delete(containers, uuid)
for _, gpuIdx := range cmd.gpuIndexes {
log.Printf("[machine] ... release GPU idx=%d gpu=%s", gpuIdx, gpulist[gpuIdx])
gpusInUse[gpuIdx] = false
}
}
mu.Unlock()
log.Printf("[machine] container %s stopped", uuid)
})
// register with the coordinator
machine := vaas.Machine{
BaseURL: fmt.Sprintf("http://%s:%d", myIP, port),
Resources: map[string]int{
"gpu": len(gpulist),
"container": runtime.NumCPU() / 4,
},
}
err := vaas.JsonPost(coordinatorURL, "/register-machine", machine, nil)
if err != nil {
panic(err)
}
log.Printf("starting on :%d", port)
if err := http.ListenAndServe(fmt.Sprintf(":%d", port), nil); err != nil {
panic(err)
}
}