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
Tracing for Granularity
Search
JBD
June 02, 2018
Programming
2
1.8k
Tracing for Granularity
JBD
June 02, 2018
Tweet
Share
More Decks by JBD
See All by JBD
eBPF in Microservices Observability at eBPF Day
rakyll
1
2.1k
eBPF in Microservices Observability
rakyll
1
1.7k
OpenTelemetry at AWS
rakyll
1
1.9k
Debugging Code Generation in Go
rakyll
5
1.6k
Are you ready for production?
rakyll
8
2.8k
Servers are doomed to fail
rakyll
3
1.5k
Serverless Containers
rakyll
1
260
Critical Path Analysis
rakyll
0
630
Monitoring and Debugging Containers
rakyll
2
1.1k
Other Decks in Programming
See All in Programming
登壇は dynamic! な営みである / speech is dynamic
da1chi
0
350
Writing Better Go: Lessons from 10 Code Reviews
konradreiche
0
1.8k
理論と実務のギャップを超える
eycjur
0
140
デミカツ切り抜きで面倒くさいことはPythonにやらせよう
aokswork3
0
250
Flutterで分数(Fraction)を表示する方法
koukimiura
0
130
いま中途半端なSwift 6対応をするより、Default ActorやApproachable Concurrencyを有効にしてからでいいんじゃない?
yimajo
2
440
スキーマ駆動で、Zod OpenAPI Honoによる、API開発するために、Hono Takibiというライブラリを作っている
nakita628
0
180
(Extension DC 2025) Actor境界を越える技術
teamhimeh
1
260
Devvox Belgium - Agentic AI Patterns
kdubois
1
130
Range on Rails ―「多重範囲型」という新たな選択肢が、複雑ロジックを劇的にシンプルにしたワケ
rizap_tech
0
6.7k
EMこそClaude Codeでコード調査しよう
shibayu36
0
130
Swift Concurrency - 状態監視の罠
objectiveaudio
2
550
Featured
See All Featured
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Building a Modern Day E-commerce SEO Strategy
aleyda
44
7.8k
Designing for Performance
lara
610
69k
Rebuilding a faster, lazier Slack
samanthasiow
84
9.2k
GitHub's CSS Performance
jonrohan
1032
470k
Navigating Team Friction
lara
190
15k
No one is an island. Learnings from fostering a developers community.
thoeni
21
3.5k
Visualization
eitanlees
149
16k
A Modern Web Designer's Workflow
chriscoyier
697
190k
Scaling GitHub
holman
463
140k
Cheating the UX When There Is Nothing More to Optimize - PixelPioneers
stephaniewalter
285
14k
The MySQL Ecosystem @ GitHub 2015
samlambert
251
13k
Transcript
tracing for granularity JBD, Google (@rakyll)
@rakyll
@rakyll tracing? What is tracing and why do we trace?
@rakyll
@rakyll clogged?
@rakyll leaking?
@rakyll path and direction?
@rakyll 100% availability (is a lie)
“ @rakyll A service is available if users cannot tell
there was an outage.
@rakyll Without an SLO, your team has no principled way
of saying what level of downtime is acceptable. • Error rate • Latency or throughput expectations Service Level Objectives (SLOs)
@rakyll 28 ms 100 ms 172 ms 56 ms 356
ms what user sees what else we can see sec.Check auth.AccessToken cache.Lookup spanner.Query GET /messages
@rakyll 182 ms 56 ms 245 ms what user sees
what else we can see sec.Check auth.AccessToken GET /messages 7 ms cache.Lookup
@rakyll latency...
@rakyll Go is the language to write servers. Many runtime
activities occur during the program execution: • scheduling • memory allocation • garbage collection Hard to associate a request with its impact on the runtime.
@rakyll clogged?
“ @rakyll There is no easy way to tell why
latency is high for certain requests. Is it due to GC, scheduler or syscalls? Can you review the code and tell us why? -SRE
@rakyll Execution tracer $ go tool trace • Reports fine-grained
runtime events in the lifetime of a goroutine. • Reports utilization of CPU cores. But cannot easily tell how handling a request impacts the runtime.
@rakyll 28 ms 100 ms 172 ms 56 ms 356
ms GET /messages auth.AccessToken cache.Lookup spanner.Query GET /messages
@rakyll 5 68µs 8 123µs networking serialization + deserialization garbage
collection blocking syscall what actually happens 172 ms auth.AccessToken
@rakyll 5 68µs 8 123µs epoll executing sys gc netwrite
@rakyll How? • Mark sections in code using runtime/trace. •
Enable execution tracer temporarily and record data. • Examine the recorded data.
@rakyll Go 1.11 introduces... • User regions, tasks and annotations.
• Association between user code and runtime. • Association with distributed traces.
@rakyll Go 1.11 runtime/trace import “runtime/trace” ctx, task := trace.NewTask(ctx,
“myHandler”) defer task.End() // Handler code here....
@rakyll region #1 task #1 Go 1.11 runtime/trace region #2
region #3 region #4 region #5 goroutine #1 goroutine #4 goroutine #5
@rakyll import _ "net/http/pprof" go func() { log.Println(http.ListenAndServe("localhost:6060", nil)) }()
@rakyll $ curl http://server:6060/debug/pprof/trace?seconds=5 -o trace.out $ go tool trace
trace.out 2018/05/04 10:39:59 Parsing trace... 2018/05/04 10:39:59 Splitting trace... 2018/05/04 10:39:59 Opening browser. Trace viewer is listening on http://127.0.0.1:51803
Execution tracer tasks for RPCs (/usertasks)
Execution tracer tasks for RPCs (/usertasks)
RPCs overlapping with garbage collection
Execution tracer regions (/userregions)
Region summary for conn.ready
@rakyll Record in production $ curl http://server/debug/pprof/trace?seconds=5 -o trace.out $
go tool trace trace.out
@rakyll Try It! Install the Go 1.11 beta1! golang.org/dl
@rakyll $ go get go.opencensus.io/trace import rt “runtime/trace” ctx, span
:= trace.StartSpan(ctx, “/messages”) defer span.End() rt.WithRegion(ctx, “foo”, func(ctx) { // Do something... })
@rakyll Limitations • Execution tracer cannot do accounting for cross-goroutine
operations automatically. • Exposition format is hard to parse if `go trace tool` is not used.
thank you! JBD, Google
[email protected]
@rakyll