X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/83c8f1685d812c31d8bd568f3c2ac1edcd120aed..f44a15adce692614ecb816dbe2d0205704d9a4ab:/services/crunch-dispatch-slurm/squeue.go

diff --git a/services/crunch-dispatch-slurm/squeue.go b/services/crunch-dispatch-slurm/squeue.go
index 0c90679d3f..819c2d2510 100644
--- a/services/crunch-dispatch-slurm/squeue.go
+++ b/services/crunch-dispatch-slurm/squeue.go
@@ -1,7 +1,12 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
 	"bytes"
+	"fmt"
 	"log"
 	"os/exec"
 	"strings"
@@ -9,18 +14,23 @@ import (
 	"time"
 )
 
+type jobPriority struct {
+	niceness        int
+	currentPriority int
+}
+
 // Squeue implements asynchronous polling monitor of the SLURM queue using the
 // command 'squeue'.
 type SqueueChecker struct {
 	Period    time.Duration
-	uuids     map[string]bool
+	uuids     map[string]jobPriority
 	startOnce sync.Once
 	done      chan struct{}
 	sync.Cond
 }
 
 func squeueFunc() *exec.Cmd {
-	return exec.Command("squeue", "--all", "--format=%j")
+	return exec.Command("squeue", "--all", "--format=%j %y %Q")
 }
 
 var squeueCmd = squeueFunc
@@ -36,7 +46,23 @@ func (sqc *SqueueChecker) HasUUID(uuid string) bool {
 
 	// block until next squeue broadcast signaling an update.
 	sqc.Wait()
-	return sqc.uuids[uuid]
+	_, exists := sqc.uuids[uuid]
+	return exists
+}
+
+// GetNiceness returns the niceness of a given uuid, or -1 if it doesn't exist.
+func (sqc *SqueueChecker) GetNiceness(uuid string) int {
+	sqc.startOnce.Do(sqc.start)
+
+	sqc.L.Lock()
+	defer sqc.L.Unlock()
+
+	n, exists := sqc.uuids[uuid]
+	if exists {
+		return n.niceness
+	} else {
+		return -1
+	}
 }
 
 // Stop stops the squeue monitoring goroutine. Do not call HasUUID
@@ -49,7 +75,7 @@ func (sqc *SqueueChecker) Stop() {
 
 // check gets the names of jobs in the SLURM queue (running and
 // queued). If it succeeds, it updates squeue.uuids and wakes up any
-// goroutines that are waiting in HasUUID().
+// goroutines that are waiting in HasUUID() or All().
 func (sqc *SqueueChecker) check() {
 	// Mutex between squeue sync and running sbatch or scancel.  This
 	// establishes a sequence so that squeue doesn't run concurrently with
@@ -66,10 +92,16 @@ func (sqc *SqueueChecker) check() {
 		return
 	}
 
-	uuids := strings.Split(stdout.String(), "\n")
-	sqc.uuids = make(map[string]bool, len(uuids))
-	for _, uuid := range uuids {
-		sqc.uuids[uuid] = true
+	lines := strings.Split(stdout.String(), "\n")
+	sqc.uuids = make(map[string]jobPriority, len(lines))
+	for _, line := range lines {
+		var uuid string
+		var nice int
+		var prio int
+		fmt.Sscan(line, &uuid, &nice, &prio)
+		if uuid != "" {
+			sqc.uuids[uuid] = jobPriority{nice, prio}
+		}
 	}
 	sqc.Broadcast()
 }
@@ -93,7 +125,16 @@ func (sqc *SqueueChecker) start() {
 	}()
 }
 
-// All Uuids in squeue
-func (sqc *SqueueChecker) AllUuids() map[string]bool {
-	return sqc.uuids
+// All waits for the next squeue invocation, and returns all job
+// names reported by squeue.
+func (sqc *SqueueChecker) All() []string {
+	sqc.startOnce.Do(sqc.start)
+	sqc.L.Lock()
+	defer sqc.L.Unlock()
+	sqc.Wait()
+	var uuids []string
+	for uuid := range sqc.uuids {
+		uuids = append(uuids, uuid)
+	}
+	return uuids
 }