G1: To Infinity and Beyond

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G1 has been around for quite some time now and since JDK 9 it is the default garbage collector in OpenJDK. The community working on G1 is big and the contributions over the last few years have made a significant impact on the overall performance. This talk will focus on some of these features and how they have improved G1 in various ways, including smaller memory footprint and shorter P99 pause times. We will also take a brief look at what features we have lined up for the future.

Technology

Brought to you by
G1: To Inﬁnity and Beyond
Stefan Johansson
OpenJDK GC Engineer, Oracle

Copyright © 2021 Oracle and/or its affiliates.
Agenda
■ GC in OpenJDK
■ Short intro to G1
■ Progress since JDK 8
■ The future

Copyright © 2021 Oracle and/or its affiliates.
GC in OpenJDK

Copyright © 2021 Oracle and/or its affiliates.
Introduction
GC in OpenJDK
● Fast allocation
● Eﬃcient reclamation
● Serving different use cases

Copyright © 2021 Oracle and/or its affiliates.
Strategies
GC in OpenJDK
● Tracing the object graph
● Stop-the-world or concurrent
● Generational collections

Copyright © 2021 Oracle and/or its affiliates.
Focus and tradeoffs
GC in OpenJDK
● Throughput
● Latency
● Footprint

Copyright © 2021 Oracle and/or its affiliates.
Current Collectors
GC in OpenJDK
Collector name Focus area Concepts
Serial Memory footprint Generational, single threaded STW collections
Parallel Throughput Generational, multi-threaded STW collections
G1 Balanced performance Generational, STW collections, concurrent marking
ZGC Low latency Concurrent collections
Shenandoah Low latency Concurrent collections

Copyright © 2021 Oracle and/or its affiliates.
Short intro to G1

Copyright © 2021 Oracle and/or its affiliates.
Basic idea
Short intro to G1
● Balance between throughput and latency
● Region based
● Concurrent marking
● Mixed collections
● Main tuning knob: pause-time goal

Copyright © 2021 Oracle and/or its affiliates.
Current status
Short intro to G1
● Supported since JDK 7u4
● Stable and mature
● Default collector since JDK 9
● Actively maintained and improved

Copyright © 2021 Oracle and/or its affiliates.
Progress since JDK 8

Copyright © 2021 Oracle and/or its affiliates.
Overview
Progress since JDK 8
● 1000+ enhancements since JDK 8
● Signiﬁcant improvements
● Across all areas
● Cut away old tradeoffs

Copyright © 2021 Oracle and/or its affiliates.
Throughput
Progress since JDK 8
● Improved NUMA awareness
● More eﬃcient concurrent work
● Parallel Full Collection

Copyright © 2021 Oracle and/or its affiliates.
Throughput
Progress since JDK 8
● SPECjbb® 2015 results
● 16 GB heap
● Not only GC improvements
● More time spent running Java
SPEC® and the benchmark name SPECjbb® are registered
trademarks of the Standard Performance Evaluation Corporation.
For more information about SPECjbb, see www.spec.org/jbb2015/.

Copyright © 2021 Oracle and/or its affiliates.
Latency
Progress since JDK 8
● Improved parallelism
● More eﬃcient processing
● Better pause time predictions
● Abortable mixed collections

Copyright © 2021 Oracle and/or its affiliates.
Latency
Progress since JDK 8
● SPECjbb® 2015 results
● 16 GB heap
● Mostly GC improvements
● Trade throughput for latency
SPEC® and the benchmark name SPECjbb® are registered
trademarks of the Standard Performance Evaluation Corporation.
For more information about SPECjbb, see www.spec.org/jbb2015/.

Copyright © 2021 Oracle and/or its affiliates.
Latency
Progress since JDK 8
● SPECjbb® 2015 ﬁxed load
● 16 GB heap
● Pause times
JDK 8 JDK 11 JDK 17
Average (ms) 154 98 84
P99 (ms) 186 126 111

Copyright © 2021 Oracle and/or its affiliates.
Latency
Progress since JDK 8
● SPECjbb® 2015 ﬁxed load
● 16 GB heap
● Pause times
JDK 8 JDK 11 JDK 17 JDK 17 50ms
Average (ms) 154 98 84 47
P99 (ms) 186 126 111 60

Copyright © 2021 Oracle and/or its affiliates.
Latency
Progress since JDK 8
● Bonus slide: ZGC
● Sub-millisecond pause goal
● All heavy work done concurrently
JDK 8 JDK 11 JDK 17 JDK 17 ZGC
Average (ms) 154 98 84 0.029
P99 (ms) 186 126 111 0.186

Copyright © 2021 Oracle and/or its affiliates.
Footprint
Progress since JDK 8
● Rebuilding remembered sets concurrently
● Improved remembered set ergonomics
● Return heap memory to the OS

Copyright © 2021 Oracle and/or its affiliates.
Footprint
Progress since JDK 8
● BigRamTester
● 16GB heap

Copyright © 2021 Oracle and/or its affiliates.
The future

Copyright © 2021 Oracle and/or its affiliates.
Keep improving
The future
● Usability improvements
● Improved write barriers
● Footprint reductions

Copyright © 2021 Oracle and/or its affiliates.
Key takeaways
To Inﬁnity and Beyond
● Massive improvements since JDK 8
● Exciting features in the pipe

Copyright © 2021 Oracle and/or its affiliates.
Brought to you by
Stefan Johansson
Twitter: @kstefanj
Blog: kstefanj.github.io

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1. Brought to you by G1: To Inﬁnity and Beyond Stefan Johansson OpenJDK GC Engineer, Oracle

7. Copyright © 2021 Oracle and/or its affiliates. Current Collectors GC in OpenJDK Collector name Focus area Concepts Serial Memory footprint Generational, single threaded STW collections Parallel Throughput Generational, multi-threaded STW collections G1 Balanced performance Generational, STW collections, concurrent marking ZGC Low latency Concurrent collections Shenandoah Low latency Concurrent collections

9. Copyright © 2021 Oracle and/or its affiliates. Basic idea Short intro to G1 ● Balance between throughput and latency ● Region based ● Concurrent marking ● Mixed collections ● Main tuning knob: pause-time goal

14. Copyright © 2021 Oracle and/or its affiliates. Throughput Progress since JDK 8 ● SPECjbb® 2015 results ● 16 GB heap ● Not only GC improvements ● More time spent running Java SPEC® and the benchmark name SPECjbb® are registered trademarks of the Standard Performance Evaluation Corporation. For more information about SPECjbb, see www.spec.org/jbb2015/.

16. Copyright © 2021 Oracle and/or its affiliates. Latency Progress since JDK 8 ● SPECjbb® 2015 results ● 16 GB heap ● Mostly GC improvements ● Trade throughput for latency SPEC® and the benchmark name SPECjbb® are registered trademarks of the Standard Performance Evaluation Corporation. For more information about SPECjbb, see www.spec.org/jbb2015/.

18. Copyright © 2021 Oracle and/or its affiliates. Latency Progress since JDK 8 ● SPECjbb® 2015 ﬁxed load ● 16 GB heap ● Pause times JDK 8 JDK 11 JDK 17 JDK 17 50ms Average (ms) 154 98 84 47 P99 (ms) 186 126 111 60

19. Copyright © 2021 Oracle and/or its affiliates. Latency Progress since JDK 8 ● Bonus slide: ZGC ● Sub-millisecond pause goal ● All heavy work done concurrently JDK 8 JDK 11 JDK 17 JDK 17 ZGC Average (ms) 154 98 84 0.029 P99 (ms) 186 126 111 0.186

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