golang 性能分析工具使用参考
主要包含了golang 自带的几个工具的使用说明
pprof
- 参考命令
go tool pprof
- 包含的命令
go tool pprof --help
支持的参数
usage:
Produce output in the specified format.
pprof <format> [options] [binary] <source>
Omit the format to get an interactive shell whose commands can be used
to generate various views of a profile
pprof [options] [binary] <source>
Omit the format and provide the "-http" flag to get an interactive web
interface at the specified host:port that can be used to navigate through
various views of a profile.
pprof -http [host]:[port] [options] [binary] <source>
Details:
Output formats (select at most one):
-callgrind Outputs a graph in callgrind format
-comments Output all profile comments
-disasm Output assembly listings annotated with samples
-dot Outputs a graph in DOT format
-eog Visualize graph through eog
-evince Visualize graph through evince
-gif Outputs a graph image in GIF format
-gv Visualize graph through gv
-kcachegrind Visualize report in KCachegrind
-list Output annotated source for functions matching regexp
-pdf Outputs a graph in PDF format
-peek Output callers/callees of functions matching regexp
-png Outputs a graph image in PNG format
-proto Outputs the profile in compressed protobuf format
-ps Outputs a graph in PS format
-raw Outputs a text representation of the raw profile
-svg Outputs a graph in SVG format
-tags Outputs all tags in the profile
-text Outputs top entries in text form
-top Outputs top entries in text form
-topproto Outputs top entries in compressed protobuf format
-traces Outputs all profile samples in text form
-tree Outputs a text rendering of call graph
-web Visualize graph through web browser
-weblist Display annotated source in a web browser
Options:
-call_tree Create a context-sensitive call tree
-compact_labels Show minimal headers
-divide_by Ratio to divide all samples before visualization
-drop_negative Ignore negative differences
-edgefraction Hide edges below <f>*total
-focus Restricts to samples going through a node matching regexp
-hide Skips nodes matching regexp
-ignore Skips paths going through any nodes matching regexp
-mean Average sample value over first value (count)
-nodecount Max number of nodes to show
-nodefraction Hide nodes below <f>*total
-noinlines Ignore inlines.
-normalize Scales profile based on the base profile.
-output Output filename for file-based outputs
-prune_from Drops any functions below the matched frame.
-relative_percentages Show percentages relative to focused subgraph
-sample_index Sample value to report (0-based index or name)
-show Only show nodes matching regexp
-show_from Drops functions above the highest matched frame.
-source_path Search path for source files
-tagfocus Restricts to samples with tags in range or matched by regexp
-taghide Skip tags matching this regexp
-tagignore Discard samples with tags in range or matched by regexp
-tagshow Only consider tags matching this regexp
-trim Honor nodefraction/edgefraction/nodecount defaults
-trim_path Path to trim from source paths before search
-unit Measurement units to display
Option groups (only set one per group):
cumulative
-cum Sort entries based on cumulative weight
-flat Sort entries based on own weight
granularity
-addresses Aggregate at the address level.
-filefunctions Aggregate at the function level.
-files Aggregate at the file level.
-functions Aggregate at the function level.
-lines Aggregate at the source code line level.
Source options:
-seconds Duration for time-based profile collection
-timeout Timeout in seconds for profile collection
-buildid Override build id for main binary
-add_comment Free-form annotation to add to the profile
Displayed on some reports or with pprof -comments
-diff_base source Source of base profile for comparison
-base source Source of base profile for profile subtraction
profile.pb.gz Profile in compressed protobuf format
legacy_profile Profile in legacy pprof format
http://host/profile URL for profile handler to retrieve
-symbolize= Controls source of symbol information
none Do not attempt symbolization
local Examine only local binaries
fastlocal Only get function names from local binaries
remote Do not examine local binaries
force Force re-symbolization
Binary Local path or build id of binary for symbolization
-tls_cert TLS client certificate file for fetching profile and symbols
-tls_key TLS private key file for fetching profile and symbols
-tls_ca TLS CA certs file for fetching profile and symbols
Misc options:
-http Provide web interface at host:port.
Host is optional and 'localhost' by default.
Port is optional and a randomly available port by default.
-no_browser Skip opening a browser for the interactive web UI.
-tools Search path for object tools
Legacy convenience options:
-inuse_space Same as -sample_index=inuse_space
-inuse_objects Same as -sample_index=inuse_objects
-alloc_space Same as -sample_index=alloc_space
-alloc_objects Same as -sample_index=alloc_objects
-total_delay Same as -sample_index=delay
-contentions Same as -sample_index=contentions
-mean_delay Same as -mean -sample_index=delay
Environment Variables:
PPROF_TMPDIR Location for saved profiles (default $HOME/pprof)
PPROF_TOOLS Search path for object-level tools
PPROF_BINARY_PATH Search path for local binary files
default: $HOME/pprof/binaries
searches $name, $path, $buildid/$name, $path/$buildid
* On Windows, %USERPROFILE% is used instead of $HOME
- 常用命令参考
交互模式
go tool pprof -seconds 20 http://127.0.0.1:8000/debug/pprof/profile
一般的命令
top10 -cum list funname tree 。。。 可以通过help 查看
web 模式
go tool pprof -http :8090 -seconds 20 http://127.0.0.1:8000/debug/pprof/profile
trace
- 参考命令
go tool trace
- 支持的命令
Usage of 'go tool trace':
Given a trace file produced by 'go test':
go test -trace=trace.out pkg
Open a web browser displaying trace:
go tool trace [flags] [pkg.test] trace.out
Generate a pprof-like profile from the trace:
go tool trace -pprof=TYPE [pkg.test] trace.out
[pkg.test] argument is required for traces produced by Go 1.6 and below.
Go 1.7 does not require the binary argument.
Supported profile types are:
- net: network blocking profile
- sync: synchronization blocking profile
- syscall: syscall blocking profile
- sched: scheduler latency profile
Flags:
-http=addr: HTTP service address (e.g., ':6060')
-pprof=type: print a pprof-like profile instead
-d: print debug info such as parsed events
Note that while the various profiles available when launching
'go tool trace' work on every browser, the trace viewer itself
(the 'view trace' page) comes from the Chrome/Chromium project
and is only actively tested on that browser.
- 参考使用
注意trace的文件需要先下载
比如：
wget -O mytrace.out http://127.0.0.1:8000/debug/pprof/trace
go tool trace -http :8090 mytrace.out
说明go 的trace 是一个很强大的工具，对于性能分析是很不错的，支持goroutines,network.syscall, 同步阻塞，调度延迟
vet&&race锁以及竟态条件处理
参考命令
go vet
go run -race *.go
