gradle 3.0: unleash the daemon!
TRANSCRIPT
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Gradle SummitGradle 3.0: Unleash the Daemon!
Eric Wendelin
2016
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Eric Wendelin@eriwen
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Long-lived Background Process
Client/Server communicating over TCP locally
Listens for and executes Build Actions
Daemon in a nutshell
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Daemonstration
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2nd build typically 15-75% faster
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faster the more
you use it
Progressive runtime optimizations
Higher class cache hit rate
More effective task I/O caching
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"Discovered the beauty of the
@gradle daemon, and now reaping the
benefits of sub-second builds"
@tylerjharden
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"Enabling the #gradle daemon took
my build from 13s to 1.1s. This should
be the default."
@GDBolinger
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5th build typically 30-90% faster
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Smokin'
fast!
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Daemon in Gradle 3.0
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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--daemon
org.gradle.daemon=true
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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Resource Awareness
System Memory
Daemon JVM Memory
GC Activity
Other Daemons
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What we've built is a framework for making the Daemon more intelligent
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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GRADLE-3018*
GRADLE-3481*
GRADLE-2803
GRADLE-3265
GRADLE-3315
GRADLE-2828
GRADLE-2275*
GRADLE-2415
GRADLE-2629
GRADLE-2367
GRADLE-2273
GRADLE-2271
Reasons not to use the Daemon
* In Progress
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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Better UX
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Daemon in Gradle 3.0
Enabled by default
Resource-aware
More robust, especially on Windows
Better UX
Integrated with Gradle Build Scans
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Gradle Build Scans
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Everyday Daemon Use
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When should I use the Daemon?
All projects, everywhereexcept possibly CI
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Daemon in IDEs
All IDEs always use the Daemon through the Gradle Tooling API
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Reusing Daemons across projects
Same Gradle version
Same $JAVA_HOME
Compatible JVM Args
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How do I score one of those sweet,
rare Gradlephant transfer stickers?
Bribery
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Maximizing
Performance
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Effective Daemon Reuse
gradle --status
gradle --info shows Daemon stopped reasons
org.gradle.daemon.idletimeout
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Daemon Performance Logging
org.gradle.daemon.performance.logging=true
~/.gradle/daemon/$VERSION/daemon-$PID.out.log
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Daemon Performance Tuning
org.gradle.daemon. performance.tenured-usage-expire-at=90
org.gradle.daemon. performance.tenured-rate-expire-at=1.2
org.gradle.daemon. performance.permgen-usage-expire-at=80
~/.gradle/daemon/$VERSION/daemon-$PID.out.log
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Build slow, even with Daemon?
Gradle Build Scans to the rescue
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gradle.github.io/performance-guide
Gradle Performance Guide
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None of these?
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News Flash: You're at the freakin' Gradle Summit
Tweet @gradle
discuss.gradle.org
None of these?
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Maximizing Performance
Reuse Daemon as much as possible
Use Build Scans
Gradle Performance Guide
discuss.gradle.org
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Beyond Gradle 3.0
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Beyond Gradle 3.0
Cross-version Daemon Registry
More intelligent caching
Better cache eviction for longer-running Daemons
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Beyond Gradle 3.0
Warms itself up while idle
Automatically adjusts for user behavior through machine learning
Speculative dependency resolution and execution
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The Daemon is the vehicle through which Gradle can
become proactive
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two more things...
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Try it today
gradle wrapper --gradle-version 3.0-milestone-2
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Give feedback
discuss.gradle.org
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gradle.org/jobs
Have ideas?
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@eriwen
Thank You
@mbarnath@ghhale @lhotariEric Wendelin and the Daemon Team
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Learn more at www.gradle.org