Upgrade to Pro — share decks privately, control downloads, hide ads and more …

Beyond top: Command-Line Monitoring on the JVM ...

Avatar for Colin Jones Colin Jones
February 11, 2016
Programming
160
0

Beyond top: Command-Line Monitoring on the JVM (ClojureRemote)

Avatar for Colin Jones

Colin Jones

February 11, 2016

More Decks by Colin Jones

See All by Colin Jones
A Bug's Life: What if `select` is Broken After All?
Avatar for Colin Jones trptcolin
0
180
Underestimated costs of microservice architectures
Avatar for Colin Jones trptcolin
3
1.6k
FP vs. OOP: Beyond the Bikeshed
Avatar for Colin Jones trptcolin
0
450
Diving into the Details with DTrace! (RubyConf 2016 edition)
Avatar for Colin Jones trptcolin
2
530
Diving into the Details with DTrace
Avatar for Colin Jones trptcolin
3
540
Adopting FP: the good, the familiar, and the unknown
Avatar for Colin Jones trptcolin
0
280
Finding out what's *really* going on, with DTrace!
Avatar for Colin Jones trptcolin
1
400
Beyond top: Command-Line Monitoring on the JVM (JavaOne 2015)
Avatar for Colin Jones trptcolin
1
700
ZooKeeper: Wait-free coordination for Internet-scale systems
Avatar for Colin Jones trptcolin
2
220

Other Decks in Programming

See All in Programming
レガシーPHP転生 〜父がドメインエキスパートだったのでDDD+Claude Codeでチート開発します〜
Avatar for panda_program panda_program
0
250
AI Assistants for Your Angular Solutions @Angular Graz, March 2026
Avatar for Manfred Steyer manfredsteyer
PRO
0
150
「速くなった気がする」をデータで疑う
Avatar for Leaf senleaf24
0
140
PHPのバージョンアップ時にも役立ったAST（2026年版）
Avatar for Atsushi Matsuo matsuo_atsushi
0
290
PHPで TLSのプロトコルを実装してみる
Avatar for higaki higaki_program
0
730
存在論的プログラミング： 時間と存在を記述する
Avatar for Akihito Koriyama koriym
5
770
10年分の技術的負債、完済へ ― Claude Code主導のAI駆動開発でスポーツブルを丸ごとリプレイスした話
Avatar for nero15 takuya_houshima
0
970
Linux Kernelの1文字のミスで 権限昇格ができた話
Avatar for rona rqda
0
2.3k
Everything Claude Code OSS詳細 — 5層構造の中身と導入方法
Avatar for techs-targe targe
0
160
生成 AI 時代のスナップショットテストってやつを見せてあげますよ（α版）
Avatar for ojun ojun9
0
340
iOS機能開発のAI環境と起きた変化
Avatar for Ryu-nakayama ryunakayama
0
150
おれのAgentic Coding 2026/03
Avatar for TsukasaSekiguchi tsukasagr
1
130

Featured

See All Featured
Bootstrapping a Software Product
Avatar for Garrett Dimon garrettdimon
PRO
307
120k
sira's awesome portfolio website redesign presentation
Avatar for ElsiraPls elsirapls
0
210
B2B Lead Gen: Tactics, Traps & Triumph
Avatar for Sophie Logan marketingsoph
0
97
XXLCSS - How to scale CSS and keep your sanity
Avatar for Zaharenia Atzitzikaki sugarenia
249
1.3M
The Art of Delivering Value - GDevCon NA Keynote
Avatar for David Neal reverentgeek
16
1.9k
Pawsitive SEO: Lessons from My Dog (and Many Mistakes) on Thriving as a Consultant in the Age of AI
Avatar for David Carrasco davidcarrasco
0
110
The Language of Interfaces
Avatar for Des Traynor destraynor
162
26k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
Avatar for Joe Casabona jcasabona
34
2.7k
Practical Orchestrator
Avatar for Shlomi Noach shlominoach
191
11k
Building Flexible Design Systems
Avatar for Yesenia Perez-Cruz yeseniaperezcruz
330
40k
Information Architects: The Missing Link in Design Systems
Avatar for Michelle Chin soysaucechin
0
870
Navigating Weather and Climate Data
Avatar for Ryan Abernathey rabernat
0
160

Transcript

  1. Beyond top(1) Command-Line Monitoring on the JVM Colin Jones @trptcolin

    8th Light

  2. command-line tooling

  3. introspection & serviceability on the JVM

  4. war stories

  5. A long time ago in a startup far, far away…

  6. Things are going pretty well

  7. But strange things are afoot

  8. the server sometimes gets really slow

  9. the team has to manually restart the application server

  10. Pain, frustration, anger

  11. Just the facts

  12. sometimes, things get slow

  13. all requests seem to be affected

  14. the JVM stays up

  15. restart the JVM and everything is fine

  16. What could it be?

  17. Demo

  18. More facts!

  19. what application code was running

  20. constant full GCs

  21. what’s in the heap

  22. What could it be?

  23. None
  24. None

  25. Mystery solved!

  26. Now “just” fix it

  27. idea 1: eliminate the leak

  28. idea 2: eliminate the cache altogether?

  29. idea 3: delete the feature

  30. idea 4: re-think the problem

  31. So we’re good, for now…

  32. Lessons

  33. “it’s slow” could mean lots of things

  34. “high CPU” could mean lots of things

  35. collecting data is crucial in a crisis

  36. reproducing the issue helps me sleep at night

  37. The right tools for the job

  38. Other “right tools for the job”

  39. Learning more

  40. Books Books!

  41. operators are standing by!

  42. Thank you! Colin Jones @trptcolin