X-Git-Url: https://git.arvados.org/arvados.git/blobdiff_plain/b7f4b12d8722609fbd607a75d317dd60b93497b7..92474d902612ad28b3f9e5b5c21de08162d23ffb:/services/crunch-dispatch-slurm/squeue.go

diff --git a/services/crunch-dispatch-slurm/squeue.go b/services/crunch-dispatch-slurm/squeue.go
index ee87a44fff..365b4e8570 100644
--- a/services/crunch-dispatch-slurm/squeue.go
+++ b/services/crunch-dispatch-slurm/squeue.go
@@ -1,30 +1,38 @@
+// Copyright (C) The Arvados Authors. All rights reserved.
+//
+// SPDX-License-Identifier: AGPL-3.0
+
 package main
 
 import (
 	"bytes"
+	"fmt"
 	"log"
-	"os/exec"
+	"sort"
 	"strings"
 	"sync"
 	"time"
 )
 
+type slurmJob struct {
+	uuid         string
+	wantPriority int64
+	priority     int64 // current slurm priority (incorporates nice value)
+	nice         int64 // current slurm nice value
+}
+
 // Squeue implements asynchronous polling monitor of the SLURM queue using the
 // command 'squeue'.
 type SqueueChecker struct {
-	Period    time.Duration
-	uuids     map[string]bool
-	startOnce sync.Once
-	done      chan struct{}
+	Period         time.Duration
+	PrioritySpread int64
+	Slurm          Slurm
+	queue          map[string]*slurmJob
+	startOnce      sync.Once
+	done           chan struct{}
 	sync.Cond
 }
 
-func squeueFunc() *exec.Cmd {
-	return exec.Command("squeue", "--all", "--format=%j")
-}
-
-var squeueCmd = squeueFunc
-
 // HasUUID checks if a given container UUID is in the slurm queue.
 // This does not run squeue directly, but instead blocks until woken
 // up by next successful update of squeue.
@@ -36,7 +44,62 @@ func (sqc *SqueueChecker) HasUUID(uuid string) bool {
 
 	// block until next squeue broadcast signaling an update.
 	sqc.Wait()
-	return sqc.uuids[uuid]
+	_, exists := sqc.queue[uuid]
+	return exists
+}
+
+// SetPriority sets or updates the desired (Arvados) priority for a
+// container.
+func (sqc *SqueueChecker) SetPriority(uuid string, want int64) {
+	sqc.startOnce.Do(sqc.start)
+	sqc.L.Lock()
+	defer sqc.L.Unlock()
+	job, ok := sqc.queue[uuid]
+	if !ok {
+		// Wait in case the slurm job was just submitted and
+		// will appear in the next squeue update.
+		sqc.Wait()
+		if job, ok = sqc.queue[uuid]; !ok {
+			return
+		}
+	}
+	job.wantPriority = want
+}
+
+// adjust slurm job nice values as needed to ensure slurm priority
+// order matches Arvados priority order.
+func (sqc *SqueueChecker) reniceAll() {
+	sqc.L.Lock()
+	defer sqc.L.Unlock()
+
+	jobs := make([]*slurmJob, 0, len(sqc.queue))
+	for _, j := range sqc.queue {
+		if j.wantPriority == 0 {
+			// SLURM job with unknown Arvados priority
+			// (perhaps it's not an Arvados job)
+			continue
+		}
+		if j.priority == 0 {
+			// SLURM <= 15.x implements "hold" by setting
+			// priority to 0. If we include held jobs
+			// here, we'll end up trying to push other
+			// jobs below them using negative priority,
+			// which won't help anything.
+			continue
+		}
+		jobs = append(jobs, j)
+	}
+
+	sort.Slice(jobs, func(i, j int) bool {
+		return jobs[i].wantPriority > jobs[j].wantPriority
+	})
+	renice := wantNice(jobs, sqc.PrioritySpread)
+	for i, job := range jobs {
+		if renice[i] == job.nice {
+			continue
+		}
+		sqc.Slurm.Renice(job.uuid, renice[i])
+	}
 }
 
 // Stop stops the squeue monitoring goroutine. Do not call HasUUID
@@ -48,7 +111,7 @@ 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
+// queued). If it succeeds, it updates sqc.queue and wakes up any
 // goroutines that are waiting in HasUUID() or All().
 func (sqc *SqueueChecker) check() {
 	// Mutex between squeue sync and running sbatch or scancel.  This
@@ -58,7 +121,7 @@ func (sqc *SqueueChecker) check() {
 	sqc.L.Lock()
 	defer sqc.L.Unlock()
 
-	cmd := squeueCmd()
+	cmd := sqc.Slurm.QueueCommand([]string{"--all", "--noheader", "--format=%j %y %Q %T %r"})
 	stdout, stderr := &bytes.Buffer{}, &bytes.Buffer{}
 	cmd.Stdout, cmd.Stderr = stdout, stderr
 	if err := cmd.Run(); err != nil {
@@ -66,11 +129,44 @@ 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")
+	newq := make(map[string]*slurmJob, len(lines))
+	for _, line := range lines {
+		if line == "" {
+			continue
+		}
+		var uuid, state, reason string
+		var n, p int64
+		if _, err := fmt.Sscan(line, &uuid, &n, &p, &state, &reason); err != nil {
+			log.Printf("warning: ignoring unparsed line in squeue output: %q", line)
+			continue
+		}
+		replacing, ok := sqc.queue[uuid]
+		if !ok {
+			replacing = &slurmJob{uuid: uuid}
+		}
+		replacing.priority = p
+		replacing.nice = n
+		newq[uuid] = replacing
+
+		if state == "PENDING" && reason == "BadConstraints" && p == 0 && replacing.wantPriority > 0 {
+			// When using SLURM 14.x or 15.x, our queued
+			// jobs land in this state when "scontrol
+			// reconfigure" invalidates their feature
+			// constraints by clearing all node features.
+			// They stay in this state even after the
+			// features reappear, until we run "scontrol
+			// release {jobid}".
+			//
+			// "scontrol release" is silent and successful
+			// regardless of whether the features have
+			// reappeared, so rather than second-guessing
+			// whether SLURM is ready, we just keep trying
+			// this until it works.
+			sqc.Slurm.Release(uuid)
+		}
 	}
+	sqc.queue = newq
 	sqc.Broadcast()
 }
 
@@ -88,6 +184,7 @@ func (sqc *SqueueChecker) start() {
 				return
 			case <-ticker.C:
 				sqc.check()
+				sqc.reniceAll()
 			}
 		}
 	}()
@@ -101,8 +198,8 @@ func (sqc *SqueueChecker) All() []string {
 	defer sqc.L.Unlock()
 	sqc.Wait()
 	var uuids []string
-	for uuid := range sqc.uuids {
-		uuids = append(uuids, uuid)
+	for u := range sqc.queue {
+		uuids = append(uuids, u)
 	}
 	return uuids
 }