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// Copyright 2019 Google Inc. All rights reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package status
import (
"android/soong/ui/metrics"
soong_metrics_proto "android/soong/ui/metrics/metrics_proto"
"time"
"google.golang.org/protobuf/proto"
)
func NewCriticalPath() *CriticalPath {
return &CriticalPath{
running: make(map[*Action]time.Time),
nodes: make(map[string]*node),
clock: osClock{},
}
}
type CriticalPath struct {
nodes map[string]*node
running map[*Action]time.Time
start, end time.Time
clock clock
}
type clock interface {
Now() time.Time
}
type osClock struct{}
func (osClock) Now() time.Time { return time.Now() }
// A critical path node stores the critical path (the minimum time to build the node and all of its dependencies given
// perfect parallelism) for an node.
type node struct {
action *Action
cumulativeDuration time.Duration
duration time.Duration
input *node
}
func (cp *CriticalPath) StartAction(action *Action) {
start := cp.clock.Now()
if cp.start.IsZero() {
cp.start = start
}
cp.running[action] = start
}
func (cp *CriticalPath) FinishAction(action *Action) {
if start, ok := cp.running[action]; ok {
delete(cp.running, action)
// Determine the input to this edge with the longest cumulative duration
var criticalPathInput *node
for _, input := range action.Inputs {
if x := cp.nodes[input]; x != nil {
if criticalPathInput == nil || x.cumulativeDuration > criticalPathInput.cumulativeDuration {
criticalPathInput = x
}
}
}
end := cp.clock.Now()
duration := end.Sub(start)
cumulativeDuration := duration
if criticalPathInput != nil {
cumulativeDuration += criticalPathInput.cumulativeDuration
}
node := &node{
action: action,
cumulativeDuration: cumulativeDuration,
duration: duration,
input: criticalPathInput,
}
for _, output := range action.Outputs {
cp.nodes[output] = node
}
cp.end = end
}
}
func (cp *CriticalPath) criticalPath() (path []*node, elapsedTime time.Duration, criticalTime time.Duration) {
var max *node
// Find the node with the longest critical path
for _, node := range cp.nodes {
if max == nil || node.cumulativeDuration > max.cumulativeDuration {
max = node
}
}
node := max
for node != nil {
path = append(path, node)
node = node.input
}
if len(path) > 0 {
// Log the critical path to the verbose log
criticalTime = path[0].cumulativeDuration
if !cp.start.IsZero() {
elapsedTime = cp.end.Sub(cp.start)
}
}
return
}
func (cp *CriticalPath) longRunningJobs() (nodes []*node) {
threshold := time.Second * 30
for _, node := range cp.nodes {
if node != nil && node.duration > threshold {
nodes = append(nodes, node)
}
}
return
}
func addJobInfos(jobInfos *[]*soong_metrics_proto.JobInfo, sources []*node) {
for _, job := range sources {
jobInfo := soong_metrics_proto.JobInfo{}
jobInfo.ElapsedTimeMicros = proto.Uint64(uint64(job.duration.Microseconds()))
jobInfo.JobDescription = &job.action.Description
*jobInfos = append(*jobInfos, &jobInfo)
}
}
func (cp *CriticalPath) WriteToMetrics(met *metrics.Metrics) {
criticalPathInfo := soong_metrics_proto.CriticalPathInfo{}
path, elapsedTime, criticalTime := cp.criticalPath()
criticalPathInfo.ElapsedTimeMicros = proto.Uint64(uint64(elapsedTime.Microseconds()))
criticalPathInfo.CriticalPathTimeMicros = proto.Uint64(uint64(criticalTime.Microseconds()))
addJobInfos(&criticalPathInfo.LongRunningJobs, cp.longRunningJobs())
addJobInfos(&criticalPathInfo.CriticalPath, path)
met.SetCriticalPathInfo(criticalPathInfo)
}
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