1、性能分析类型
http://localhost:8083/debug/pprof/
/debug/pprof/
Types of profiles available:
Count Profile
31 allocs 【跟heap类似，不过关注于分配】
0 block 【查看导致阻塞同步的堆栈跟踪】
0 cmdline 【http://localhost:8083/debug/pprof/cmdline?debug=1】
19 goroutine 【调用链要从下往上看，由下面生成最后都到gopark】
31 heap 【查看活动对象的内存分配情况】
0 mutex 【查看导致互斥锁的竞争持有者的堆栈跟踪】
0 profile 【获取cpu执行的情况，必含有seconds=x，不填默认30s】
12 threadcreate
0 trace
full goroutine stack dump
Profile Descriptions:
allocs: A sampling of all past memory allocations
block: Stack traces that led to blocking on synchronization primitives
cmdline: The command line invocation of the current program
goroutine: Stack traces of all current goroutines
heap: A sampling of memory allocations of live objects. You can specify the gc GET parameter to run GC before taking the heap sample.
mutex: Stack traces of holders of contended mutexes
profile: CPU profile. You can specify the duration in the seconds GET parameter. After you get the profile file, use the go tool pprof command to investigate the profile.
threadcreate: Stack traces that led to the creation of new OS threads
trace: A trace of execution of the current program. You can specify the duration in the seconds GET parameter. After you get the trace file, use the go tool trace command to investigate the trace.
darjun.github.io/2021/06/09/… segmentfault.com/a/119000001… zhuanlan.zhihu.com/p/371713134
2、命令行使用
go tool pprof http://localhost:8083/debug/pprof/heap?seconds=2
Fetching profile over HTTP from http://localhost:8083/debug/pprof/heap?seconds=2
Saved profile in /Users/admin/pprof/pprof.alloc_objects.alloc_space.inuse_objects.inuse_space.014.pb.gz
Type: inuse_space
Time: Oct 21, 2022 at 1:48am (CST)
Duration: 2.01s, Total samples = 0
No samples were found with the default sample value type.
Try "sample_index" command to analyze different sample values.
Entering interactive mode (type "help" for commands, "o" for options)
(pprof) top
Showing nodes accounting for 0, 0% of 0 total
flat flat% sum% cum cum%
(pprof) help
Commands:
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
o/options List options and their current values
q/quit/exit/^D Exit pprof
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
intel_syntax Show assembly in Intel syntax
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):
granularity
functions Aggregate at the function level.
filefunctions Aggregate at the function level.
files Aggregate at the file level.
lines Aggregate at the source code line level.
addresses Aggregate at the address level.
sort
cum Sort entries based on cumulative weight
flat Sort entries based on own weight
: Clear focus/ignore/hide/tagfocus/tagignore
type "help <cmd|option>" for more information
3、web端详解
web端几种比较常见的查看方式
go tool pprof -http :8090 http://localhost:8083/debug/pprof/heap\?seconds\=5
go tool pprof -http :8090 /Users/admin/pprof/pprof.alloc_objects.alloc_space.inuse_objects.inuse_space.012.pb.gz
上面两个【top和graph】可以结合下面的focus，分析方法的具体调用链。
4、pprof实现分析 jishuin.proginn.com/p/763bfbd58…
