🔥 FlamegrapHs! 🔥
adam meghji
Co-Founder & CTO, Universe
Vice President, Ticketmaster
Entrepreneur & hacker.
Passionate about DevOps & APIs
Create an event and sell tickets within minutes
Mobile ticketing with at-the-door payments
flame-whats?!
🔥 flamegraphs! 🔥
Profiling by sampling at a fixed rate.
A stack trace is captured at each moment in time.
Originated in DTrace for kernel / systems profiling
SUPER EASY to add to Ruby / Rails apps!
FLAMEGRAPH ANATOMY 😷
Call stack
Time
flamegraph layers 🍰
Mouseover to reveal that layer's stack trace
🔩 installation 🔨
Happy flamegraph 😌
Reasonably bell-curved, LGTM
SAD FLAMEGRAPH #1 😅
What's that large flat-line?
SAD FLAMEGRAPH #1 😑
CLUE #1 ...
SAD FLAMEGRAPH #1 😢
CLUE #2 ...
SAD FLAMEGRAPH #1 😭
ANSWER: Slow microservice call :)
SAD FLAMEGRAPH #2 😅
What are those spikes?
SAD FLAMEGRAPH #2 😑
CLUE #1 ...
SAD FLAMEGRAPH #2 😢
CLUE #2 ...
SAD FLAMEGRAPH #2 😭
ANSWER: 1+N Query!
1 record has_many N records fetched individually.
REAL EXAMPLE ..
uncached admin request 😫
numerous problems 💀
PROBLEM #1 😰
47.41% time spent! 💩
We're spending a lot of time
counting something in a serializer.
AFTER WE OPTIMIZE .. 😂
Still bad, BUT 2x better! 🍻
QUESTIONS?
🙋🙋🙋
happy hacking! 👊
@AdamMeghji
adam@universe.com