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processor.go
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processor.go
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//
// Copyright © 2017-2019 Solus Project
//
// 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 jobs
import (
"runtime"
"sync"
log "github.com/sirupsen/logrus"
"github.com/getsolus/ferryd/src/ferryd/core"
)
// A Processor is responsible for the main dispatch and bulking of jobs
// to ensure they're handled in the most optimal fashion.
type Processor struct {
manager *core.Manager
store *JobStore
wg *sync.WaitGroup
closed bool
njobs int
workers []*Worker
}
// NewProcessor will return a new Processor with the specified number
// of jobs. Note that "njobs" only refers to the number of *background jobs*,
// the majority of operations will run sequentially
func NewProcessor(m *core.Manager, store *JobStore, njobs int) *Processor {
// If we set to -1, we'll automatically set to half of the system core count
// because we use xz -T 2 (so twice the number of threads ..)
if njobs < 0 {
njobs = runtime.NumCPU() / 2
}
if njobs < 2 {
njobs = runtime.NumCPU()
}
oldJobs := runtime.GOMAXPROCS(njobs + 5)
// Don't intentionally break things.
if oldJobs < njobs+5 {
oldJobs = runtime.GOMAXPROCS(oldJobs)
}
log.WithFields(log.Fields{
"jobs": njobs,
"oldMaxProcs": oldJobs,
"maxProcs": njobs + 5,
}).Info("Set runtime job limits")
ret := &Processor{
manager: m,
store: store,
wg: &sync.WaitGroup{},
closed: false,
njobs: njobs,
}
// Construct worker pool
ret.workers = append(ret.workers, NewWorkerSequential(ret))
for i := 0; i < njobs; i++ {
ret.workers = append(ret.workers, NewWorkerAsync(ret))
}
return ret
}
// Close an existing Processor, waiting for all jobs to complete
func (j *Processor) Close() {
if j.closed {
return
}
j.closed = true
// Close all of our workers
for _, j := range j.workers {
j.Stop()
}
j.wg.Wait()
}
// Begin will start the main job processor in parallel
func (j *Processor) Begin() {
if j.closed {
return
}
j.wg.Add(j.njobs + 1)
for _, j := range j.workers {
go j.Start()
}
}
// PushJob will automatically determine which queue to push a job to and place
// it there for immediate execution
func (j *Processor) PushJob(job *JobEntry) {
if job.sequential {
j.store.PushSequentialJob(job)
} else {
j.store.PushAsyncJob(job)
}
}