Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
JVM入門 -メモリ管理編-
Search
Kinoko
July 18, 2019
Programming
15
4.4k
JVM入門 -メモリ管理編-
関ジャバ'19 7月度 - connpass
https://kanjava.connpass.com/event/134133/
登壇資料
Kinoko
July 18, 2019
Tweet
Share
More Decks by Kinoko
See All by Kinoko
自作キーボードにチャレンジしてみた。 ver 2.0
sammy7th
0
2k
私が考える理想の開発チーム
sammy7th
0
660
ビジネスルールを軸とした ソフトウェア開発手法 「CCSR」
sammy7th
7
2.5k
お家に居れなくなって 3週間ゲストハウス暮らしをしていた話
sammy7th
2
510
家で仕事中にインターフォンに気づかず困っているのでIoTでなんとかしたい
sammy7th
1
190
ホットサンドメーカーで作るスイーツ
sammy7th
0
280
JVM入門 -Javaプログラムが動く仕組み-
sammy7th
35
14k
Udemyでプログラミング の動画講座を販売してみた
sammy7th
1
880
Git運用基礎
sammy7th
1
280
Other Decks in Programming
See All in Programming
Six and a half ridiculous things to do with Quarkus
hollycummins
0
210
contribution to astral-sh/uv
shunsock
0
440
その面倒な作業、「Dart」にやらせませんか? Flutter開発者のための業務効率化
yordgenome03
1
140
AIと人間の共創開発!OSSで試行錯誤した開発スタイル
mae616
2
770
Things You Thought You Didn’t Need To Care About That Have a Big Impact On Your Job
hollycummins
0
250
Developer Joy - The New Paradigm
hollycummins
1
330
CSC305 Lecture 06
javiergs
PRO
0
270
他言語経験者が Golangci-lint を最初のコーディングメンターにした話 / How Golangci-lint Became My First Coding Mentor: A Story from a Polyglot Programmer
uma31
0
330
実践Claude Code:20の失敗から学ぶAIペアプログラミング
takedatakashi
16
6.4k
モテるデスク環境
mozumasu
3
640
What Spring Developers Should Know About Jakarta EE
ivargrimstad
0
370
Devvox Belgium - Agentic AI Patterns
kdubois
1
130
Featured
See All Featured
Learning to Love Humans: Emotional Interface Design
aarron
274
41k
Art, The Web, and Tiny UX
lynnandtonic
303
21k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
31
2.7k
Facilitating Awesome Meetings
lara
56
6.6k
Let's Do A Bunch of Simple Stuff to Make Websites Faster
chriscoyier
508
140k
The Straight Up "How To Draw Better" Workshop
denniskardys
238
140k
Performance Is Good for Brains [We Love Speed 2024]
tammyeverts
12
1.2k
Building Flexible Design Systems
yeseniaperezcruz
329
39k
The Art of Programming - Codeland 2020
erikaheidi
56
14k
RailsConf & Balkan Ruby 2019: The Past, Present, and Future of Rails at GitHub
eileencodes
140
34k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
249
1.3M
Context Engineering - Making Every Token Count
addyosmani
7
280
Transcript
JVMೖ -ϝϞϦཧฤ- Abe Asami
ࣗݾհ "CF"TBNJl͖ͷࢠz େࡕͷϑϦʔϥϯεϓϩάϥϚ IUUQOPDPOPOFU !BBUI +BWB,PUMJO4DBMBͳͲͳͲ
࠷͍ۙͬͯΔ͜ͱ https://www.geekhub.jp/ ΤϯδχΞಛԽ߹ಉઆ໌ձΠϕϯτɻ࣍ճ 9/14() ։࠵༧ఆ ʮJava11ʹΑΔ WebΞϓϦέʔγϣϯ։ൃͰֶͿ Javaϓϩάϥϛϯάೖʯൢചத https://www.udemy.com/java11-springbootweb-java/
͜ͷςʔϚΛબΜͩཧ༝ • ਖ਼JVMͷ͜ͱงғؾͰ͔͠ཧղ͍ͯ͠ͳ ͍ͨΊɺษڧ͔͔ͨͬͨ͠Β • ӡ༻ϑΣʔζʹܞΘΔػձ͕গͳ͘ɺύ ϑΥʔϚϯεϝϞϦपΓͷτϥϒϧૺ۰ ܦݧ͕͋·Γͳ͍ɾɾɾ • ࠓϝϞϦཧͷ͚ͩͰ͢
ͦͦJVMͱ
Java VM (JavaԾϚγϯ) • JavaόΠτίʔυΛ࣮ߦ͢ΔͨΊͷԾڥ • OSґଘΛٵऩͯ͘͠Ε͍ͯΔ
JVMʹछྨ͕͋Δ • HotSpot VM, IBM JVM, JRockit, ͳͲͳͲ
ࠓճHotSpot VMͷ • Oracle͕ఏڙ͍ͯ͠ΔJVM
͋ͱࠓճJava8ͷͰ͢ • ͜ͷ͋ͱͷݕূͰͬͨͷ͕Java8
JVMͷΈ (ΊͬͪΌͬ͘͟Γ)
ϝϞϦߏ
None
None
None
None
None
None
None
None
None
None
None
࣮ࡍͷϓϩάϥϜͰ GCͷঢ়گΛղੳͯ͠ΈΔ
GCϩά • GCͷॲཧ࣌ؒલޙͷϝϞϦ༻ྔͳͲͷϩ ά
GCViewer • GCϩάͷϏϡʔΞʔ • https://github.com/chewiebug/GCViewer • 2019/07/18 ݱࡏɺJDK11ະରԠ
ͱΓ͋͑ͣɺ ͳΜ͔͠Βಈ͔ͯ͠ GCϩάΛग़ͯ͠ΈΔ
ࢀর͕Βͳ͍ΠϯελϯεΛ ͻͨ͢Βੜ
࣮ߦ java -Xloggc:gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps Main GCϩάग़ྗͷͨΊͷΦϓγϣϯ (※ඪ४ग़ྗʹग़͚ͩ͢Ͱ͋Ε -verbose:gc
͚͚ͩͭΕOK)
ग़ྗ͞Εͨϩά
GCViewerͰ։͍ͯΈΔ
ΦϒδΣΫτ·ͣYoungྖҬʹ࡞ΒΕɺ ੜ͔Β͕࣌ؒܦͭͱOldྖҬʹҠಈ͢Δ
ࠓճOldྖҬͷҠಈ͕ൃੜ͠ͳ͍ͨΊ ώʔϓશମͷ༻ྔ ≒ YoungྖҬͷώʔϓ༻ྔ
GC࣌ʹͪΌΜͱϝϞϦ͕ղ์͞Ε͍ͯΔ
ϚΠφʔGCɾɾɾYoungྖҬͷΈ͕ର YoungྖҬ͕ ͍ͬͺ͍ʹͳͬͨ λΠϛϯάͰ ϚΠφʔGC͕ ࣮ߦ͞Ε͍ͯΔ
͏1ύλʔϯ ࢼͯ͠ΈΔ
ࢀর͕ΔΠϯελϯεΛ ͻͨ͢Βੜ
GCϩά
͜ΕGCViewerͰ։͍ͯΈΔ
None
Full GC (ϝδϟʔGC)ɾɾɾશώʔϓྖҬ͕ର
Full GC͕͔͔࣌ؒΔ 2019-07-18T07:28:35.759-0900: 53.145: [GC (Allocation Failure) [PSYoungGen: 1153507K->190965K(1768960K)] 1400776K->506242K(2118656K),
0.3026525 secs] [Times: user=2.55 sys=0.14, real=0.31 secs] 2019-07-18T07:28:36.064-0900: 53.450: [Full GC (Ergonomics) [PSYoungGen: 190965K->190932K(1768960K)] [ParOldGe 315276K->290297K(610816K)] 506242K->481229K(2379776K), [Metaspace: 2676K->2676K(1056768K)], 4.7517463 secs] [Times: user=29.92 sys=0.06, real=4.75 secs] ্ͷϚΠφʔGC ɾɾɾ 0.31 secs ԼͷFull GC ɾɾɾ 4.75 secs
GCதΞϓϦέʔγϣϯ εϨου͕ࢭ·Δ Stop the World (STW) ͱݺΕΔ
OutOfMemoryError(OOME) Λൃੜͤͯ͞ΈΔ
ώʔϓͷ࠷େαΠζΛมߋ ͯ͠ΈΔ % java -Xms600m -Xmx800m -Xloggc:gc.log -XX:+PrintGCDetails -XX: +PrintGCDateStamps
Main -Xms ɾɾɾώʔϓͷॳظαΠζ -Xmx ɾɾɾώʔϓͷ࠷େαΠζ
ແࣄ(?) OOMEൃੜ
GCϩά
͏ͪΐͬͱৄ͘͠ղੳΛ ͯ͠ΈΔ
ώʔϓμϯϓ • ಛఆͷ࣌ࠁʹώʔϓʹؚ·ΕΔͯ͢ͷΦϒ δΣΫτͷεφοϓγϣοτ
OOMEൃੜ࣌ʹώʔϓμϯϓΛ ग़ྗͤͯ͞ΈΔ java -Xms600m -Xmx800m -Xloggc:gc.log -XX:+PrintGCDetails -XX: +PrintGCDateStamps -XX:+HeapDumpOnOutOfMemoryError
Main -XX:+HeapDumpOnOutOfMemoryError ɾɾɾ OOMEൃੜ࣌ʹώʔϓμϯϓΛग़ྗ
The Eclipse Memory Analyzer • Eclipse Memory Analyzer Open Source
Project | The Eclipse Foundation https://www.eclipse.org/mat/ • ώʔϓμϯϓΛ͍͍ײ͡ʹදࣔͯ͘͠ΕΔGUI πʔϧ
ώʔϓμϯϓΛ։͍ͯΈͨ
None
None
·ͱΊ • ͜͏͍ͬͨJVMͷجຊൃੜ࣌ͷղੳํ ๏Λ͓ͬͯ͘ͱɺ͍͟ͱ͍͏ͱ͖ʹ߄ͯͳ ͯ͘ศར(ଟ)
ͪͳΈʹJava11ͷσʔλੳʹ Java Mission ControlΛ͏ͱ͍͍ͦ͏Ͱ͢ • Java Mission Control https://www.oracle.com/technetwork/jp/
java/javaseproducts/mission-control/ index.html • ༗ঈػೳ͕ͩͬͨɺJava11͔ΒOpenJDKʹ دଃ͞Εͯແঈఏڙͱͳͬͨ
ࢀߟʹͨ͠ϖʔδ • OutOfMemoryError ͷௐํ - Qiita https://qiita.com/opengl-8080/items/ 64152ee9965441f7667b • JavaͲͷΑ͏ʹಈ͘ͷ͔ʙਤղͰΘ͔ΔJVMͷΈɿ࿈ࡌʛgihyo.jp
… ٕज़ධࣾ http://gihyo.jp/dev/serial/01/jvm-arc • ʮϝϞϦʔΛҙࣝͯ͠ΈΑ͏ʯୈ2ճɹGCͷΈΛཧղ͢Δ | ܦ xTECH ʢΫϩεςοΫʣ https://tech.nikkeibp.co.jp/it/article/COLUMN/ 20060612/240657/?rt=nocnt • ·͡ΊʹJVMνϡʔχϯά: ୈ1ճ ·ͣݱঢ়֬ೝ https://x1.inkenkun.com/ archives/367
͝ਗ਼ௌ ͋Γ͕ͱ͏͍͟͝·ͨ͠