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https://github.com/valyala/fasthttp.git
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René
fde83f8e3d
- OnChildRecover: signature changed to func(oldPid, newPid int) so callers can track which process was replaced - OnChildSpawn: also called for recovered children (a recovered child is still a spawned child) - watchMaster: call OnMasterDeath when FindProcess fails (process is most likely gone) - CommandProducer: document that FASTHTTP_PREFORK_CHILD=1 must be set in the child env, and what the default does when nil Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Prefork
Server prefork implementation.
Preforks master process between several child processes increases performance, because Go doesn't have to share and manage memory between cores.
WARNING: using prefork prevents the use of any global state!. Things like in-memory caches won't work.
- How it works:
import (
"github.com/valyala/fasthttp"
"github.com/valyala/fasthttp/prefork"
)
server := &fasthttp.Server{
// Your configuration
}
// Wraps the server with prefork
preforkServer := prefork.New(server)
if err := preforkServer.ListenAndServe(":8080"); err != nil {
panic(err)
}
Benchmarks
Environment:
- Machine: MacBook Pro 13-inch, 2017
- OS: MacOS 10.15.3
- Go: go1.13.6 darwin/amd64
Handler code:
func requestHandler(ctx *fasthttp.RequestCtx) {
// Simulates some hard work
time.Sleep(100 * time.Millisecond)
}
Test command:
$ wrk -H 'Host: localhost' -H 'Accept: text/plain,text/html;q=0.9,application/xhtml+xml;q=0.9,application/xml;q=0.8,*/*;q=0.7' -H 'Connection: keep-alive' --latency -d 15 -c 512 --timeout 8 -t 4 http://localhost:8080
Results:
- prefork
Running 15s test @ http://localhost:8080
4 threads and 512 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 4.75ms 4.27ms 126.24ms 97.45%
Req/Sec 26.46k 4.16k 71.18k 88.72%
Latency Distribution
50% 4.55ms
75% 4.82ms
90% 5.46ms
99% 15.49ms
1581916 requests in 15.09s, 140.30MB read
Socket errors: connect 0, read 318, write 0, timeout 0
Requests/sec: 104861.58
Transfer/sec: 9.30MB
- non-prefork
Running 15s test @ http://localhost:8080
4 threads and 512 connections
Thread Stats Avg Stdev Max +/- Stdev
Latency 6.42ms 11.83ms 177.19ms 96.42%
Req/Sec 24.96k 5.83k 56.83k 82.93%
Latency Distribution
50% 4.53ms
75% 4.93ms
90% 6.94ms
99% 74.54ms
1472441 requests in 15.09s, 130.59MB read
Socket errors: connect 0, read 265, write 0, timeout 0
Requests/sec: 97553.34
Transfer/sec: 8.65MB