Go to file
Carl Mastrangelo 1dff107de1 Don't re-arm timerfd each epoll_wait (#7816)
Motivation:
The Epoll transport checks to see if there are any scheduled tasks
before entering epoll_wait, and resets the timerfd just before.
This causes an extra syscall to timerfd_settime before doing any
actual work.   When scheduled tasks aren't added frequently, or
tasks are added with later deadlines, this is unnecessary.

Modification:
Check the *deadline* of the peeked task in EpollEventLoop, rather
than the *delay*.  If it hasn't changed since last time, don't
re-arm the timer

Result:
About 2us faster on gRPC RTT 50pct latency benchmarks.

Before (2 runs for 5 minutes, 1 minute of warmup):

```
50.0%ile Latency (in nanos):		64267
90.0%ile Latency (in nanos):		72851
95.0%ile Latency (in nanos):		78903
99.0%ile Latency (in nanos):		92327
99.9%ile Latency (in nanos):		119691
100.0%ile Latency (in nanos):		13347327
QPS:                           14933

50.0%ile Latency (in nanos):		63907
90.0%ile Latency (in nanos):		73055
95.0%ile Latency (in nanos):		79443
99.0%ile Latency (in nanos):		93739
99.9%ile Latency (in nanos):		123583
100.0%ile Latency (in nanos):		14028287
QPS:                           14936
```

After:
```
50.0%ile Latency (in nanos):		62123
90.0%ile Latency (in nanos):		70795
95.0%ile Latency (in nanos):		76895
99.0%ile Latency (in nanos):		90887
99.9%ile Latency (in nanos):		117819
100.0%ile Latency (in nanos):		14126591
QPS:                           15387

50.0%ile Latency (in nanos):		61021
90.0%ile Latency (in nanos):		70311
95.0%ile Latency (in nanos):		76687
99.0%ile Latency (in nanos):		90887
99.9%ile Latency (in nanos):		119527
100.0%ile Latency (in nanos):		6351615
QPS:                           15571
```
2018-09-11 13:38:38 +02:00
.github Use GitHub Issue/PR Template Feature 2016-12-07 11:40:26 -08:00
.mvn/wrapper Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
all [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
bom [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
buffer Directly init refCnt to 1 (#8274) 2018-09-07 19:04:19 +02:00
codec Correctly reset offset when fail lazy because of too long frame. (#8257) 2018-09-04 19:13:56 +02:00
codec-dns [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-haproxy [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-http [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-http2 [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-memcache [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-mqtt Add headers to MqttMessage returned by MqttDecoder in case of DecoderException (#8219) 2018-08-31 15:06:09 +02:00
codec-redis [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-smtp [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-socks [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-stomp [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
codec-xml [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
common Don't re-arm timerfd each epoll_wait (#7816) 2018-09-11 13:38:38 +02:00
dev-tools [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
docker Use Java11+ea28 during build. (#8113) 2018-08-25 07:26:56 +02:00
example [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
handler PemPrivateKey.toPem(...) should throw IllegalArgumentException when P… (#8253) 2018-09-05 20:33:40 +02:00
handler-proxy [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
license Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
microbench Use a non-volatile read for ensureAccessible() whenever possible to reduce overhead and allow better inlining. (#8266) 2018-09-07 07:47:02 +02:00
resolver Allow to parse hosts file which is stored in a different encoding then the default system encoding. (#8211) 2018-08-24 19:48:27 +02:00
resolver-dns [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
tarball [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
testsuite [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
testsuite-autobahn [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
testsuite-http2 [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
testsuite-osgi [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
testsuite-shading [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
transport NioEventLoop should also use our special SelectionKeySet on Java9 and later. (#8260) 2018-09-05 07:23:03 +02:00
transport-native-epoll Don't re-arm timerfd each epoll_wait (#7816) 2018-09-11 13:38:38 +02:00
transport-native-kqueue We should call the UnLoad methods when we detect an error during calling OnLoad (#8237) 2018-08-30 06:56:42 +02:00
transport-native-unix-common Allow to use native transports when sun.misc.Unsafe is not present on… (#8231) 2018-08-29 19:36:33 +02:00
transport-native-unix-common-tests [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
transport-rxtx [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
transport-sctp [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
transport-udt [maven-release-plugin] prepare for next development iteration 2018-08-24 06:36:33 +00:00
.fbprefs Updated Find Bugs configuration 2009-03-04 10:33:09 +00:00
.gitattributes Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
.gitignore Add docker-sync files to .gitignore 2018-05-15 10:39:14 +02:00
CONTRIBUTING.md Move the pull request guide to the developer guide 2014-03-12 13:13:58 +09:00
LICENSE.txt Relicensed to Apache License v2 2009-08-28 07:15:49 +00:00
mvnw Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
mvnw.cmd Include mvn wrapper to make setup of development env easier 2018-01-26 08:13:17 +01:00
NOTICE.txt Add the NOTICE of the forked portion of Apache Harmony 2018-01-30 11:22:51 +01:00
pom.xml Update to latest netty-tcnative (#8246) 2018-08-31 17:08:14 +02:00
README.md Provide an Automatic-Module-Name for the netty-all artifact fixes #7644 2018-01-27 20:31:16 +01:00
run-example.sh Add UptimeServer and adjust UptimeClient's code style. 2017-04-28 07:41:07 +02:00

Netty Project

Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.

How to build

For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.

You require the following to build Netty:

Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+) is enough to run your Netty-based application.

Branches to look

Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.0 resides in the branch '3.9' and the branch '4.0' respectively.

Usage with JDK 9

Netty can be used in modular JDK9 applications as a collection of automatic modules. The module names follow the reverse-DNS style, and are derived from subproject names rather than root packages due to historical reasons. They are listed below:

  • io.netty.all
  • io.netty.buffer
  • io.netty.codec
  • io.netty.codec.dns
  • io.netty.codec.haproxy
  • io.netty.codec.http
  • io.netty.codec.http2
  • io.netty.codec.memcache
  • io.netty.codec.mqtt
  • io.netty.codec.redis
  • io.netty.codec.smtp
  • io.netty.codec.socks
  • io.netty.codec.stomp
  • io.netty.codec.xml
  • io.netty.common
  • io.netty.handler
  • io.netty.handler.proxy
  • io.netty.resolver
  • io.netty.resolver.dns
  • io.netty.transport
  • io.netty.transport.epoll (native omitted - reserved keyword in Java)
  • io.netty.transport.kqueue (native omitted - reserved keyword in Java)
  • io.netty.transport.unix.common (native omitted - reserved keyword in Java)
  • io.netty.transport.rxtx
  • io.netty.transport.sctp
  • io.netty.transport.udt

Automatic modules do not provide any means to declare dependencies, so you need to list each used module separately in your module-info file.