goroutine-inspect
An interactive tool to analyze Golang goroutine dump.
Build and Run
go get github.com/linuxerwang/goroutine-inspect
$GOPATH/bin/goroutine-inspect
Workspace
Workspace is the place to hold imported goroutine dumps. Instructions are
provided to maintain these dumps.
In the interactive shell, two kinds of instructions can be issued: commands
and statements.
Commands
At present, the following commands are supported., command, function, -------, ---------------------------------, cd, Change current working directory., clear, Clear the workspace., exit, Exit the interactive shell., help, Show help., ls, Show files in current directory., pwd, Show present working directory., quit, Quit the interactive shell., whos, Show all varaibles in workspace., ## Statements
Load Goroutine Dump From Files
Load the dump and assign to a variable:
>> original = load("pprof-goroutines-20170510-170245.dump")
>> whos
original
Show the Summary of a Dump Var
Simply type the variable name:
>> original
# of goroutines: 2217
running: 1
IO wait: 533
syscall: 2
chan receive: 50
select: 1504
runnable: 38
semacquire: 85
chan send: 4
Copy a Dump Var
To copy the whole dump, simply assign it to a different var:
>> copy1 = original
>> whos
copy original
It's equivalent to using a copy() function:
>> copy2 = original.copy()
>> whos
copy copy1 copy2 original
The copy() function allows passing a conditional so that only those meeting
the cariteria will be copied:
>> copy3 = original.copy("id>900 && id<2000")
Modify the Dump Goroutine Items
Function delete() accepts a conditional to delete goroutine items in a dump
var. Function keep() do the reversed conditional.
>> copy
# of goroutines: 2217
running: 1
IO wait: 533
syscall: 2
chan receive: 50
select: 1504
runnable: 38
semacquire: 85
chan send: 4
>> copy.delete("id>100 && id<1000")
Deleted 118 goroutines, kept 2099.
>> copy.keep("id>200")
Deleted 12 goroutines, kept 2087.
>> copy
# of goroutines: 2087
running: 1
select: 1411
IO wait: 500
semacquire: 85
runnable: 37
chan receive: 49
chan send: 4
Display Goroutine Dump Items
Function show() displays goroutine dump items with optional offset and limit.
The default offset is 0, and default limit is 10.
>> original.show() # offset 0, limit 10
goroutine 1803 [select, 10 minutes]:
google.golang.org/grpc/transport.(*http2Server).keepalive(0xc420e59ce0)
google.golang.org/grpc/transport/http2_server.go:919 +0x488
created by google.golang.org/grpc/transport.newHTTP2Server
google.golang.org/grpc/transport/http2_server.go:226 +0x97c
...
...
>> original.show(15) # offset 15, limit 10
goroutine 6455709 [running]:
runtime/pprof.writeGoroutineStacks(0xe9a080, 0xc4216f0088, 0x1d, 0x40)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:603 +0x79
runtime/pprof.writeGoroutine(0xe9a080, 0xc4216f0088, 0x2, 0x1d, 0xc4217cede0)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:592 +0x44
runtime/pprof.(*Profile).WriteTo(0xed3780, 0xe9a080, 0xc4216f0088, 0x2, 0xc4217cef80, 0x1)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:302 +0x3b5
www.test.com/bagel/runtime.dumpToFile(0xed0f0ba5e, 0xae05027, 0xee1780, 0xc425bd2060, 0x5, 0x5)
www.test.com/bagel/runtime/dump.go:58 +0x3f3
created by www.test.com/bagel/runtime.EnableGoroutineDump.func1
www.test.com/bagel/runtime/dump.go:30 +0x2d6
...
...
>> original.show(15, 1) # offset 15, limit 1
goroutine 6455709 [running]:
runtime/pprof.writeGoroutineStacks(0xe9a080, 0xc4216f0088, 0x1d, 0x40)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:603 +0x79
runtime/pprof.writeGoroutine(0xe9a080, 0xc4216f0088, 0x2, 0x1d, 0xc4217cede0)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:592 +0x44
runtime/pprof.(*Profile).WriteTo(0xed3780, 0xe9a080, 0xc4216f0088, 0x2, 0xc4217cef80, 0x1)
go1.8.1.linux-amd64/src/runtime/pprof/pprof.go:302 +0x3b5
www.test.com/bagel/runtime.dumpToFile(0xed0f0ba5e, 0xae05027, 0xee1780, 0xc425bd2060, 0x5, 0x5)
www.test.com/bagel/runtime/dump.go:58 +0x3f3
created by www.test.com/bagel/runtime.EnableGoroutineDump.func1
www.test.com/bagel/runtime/dump.go:30 +0x2d6
Search Goroutine Dump Items
Similar to show(), but with a conditional to only show items meeting certain
criteria:
>> original.search("id < 2000", 15, 1) # offset 15, limit 1
goroutine 6455896 [select]:
net.(*netFD).connect.func2(0xea1980, 0xc424bca540, 0xc422c1af50, 0xc424bca600, 0xc424bca5a0)
go1.8.1.linux-amd64/src/net/fd_unix.go:133 +0x1d5
created by net.(*netFD).connect
go1.8.1.linux-amd64/src/net/fd_unix.go:144 +0x239
One useful ability is to filter goroutines by running time:
>> original.search("duration > 10") # duration larger than 10 minutes
goroutine 72 [select, 25 minutes]: 119 times: [72, 54755, 76757, 299, 201, 286, 283, 296, 204, 302, 207, 305, 338, 356, 359, 362, 365, 372, 375, 368, 378, 328, 331, 387, 381
, 390, 384, 403, 393, 334, 406, 396, 399, 337, 418, 341, 436, 344, 439, 421, 424, 409, 427, 452, 430, 433, 442, 455, 445, 458, 448, 461, 464, 468, 483, 471, 499, 486, 502, 5
05, 489, 76462, 76773, 54530, 54572, 55194, 54824, 54481, 42719, 54691, 54859, 55023, 75593, 76750, 55202, 54885, 79006, 54468, 55212, 54473, 54462, 54931, 54864, 55133, 550
97, 54882, 54901, 55209, 54499, 55114, 54564, 76653, 54416, 54527, 75588, 55034, 54868, 54791, 54813, 54698, 54579, 55111, 54443, 54486, 76467, 54654, 54537, 54456, 55126, 5
5117, 54622, 55199, 54556, 54477, 54871, 79498, 76601, 76735, 76996]
google.golang.org/grpc/transport.(*http2Server).keepalive(0xc4202f0420)
google.golang.org/grpc/transport/http2_server.go:919 +0x488
created by google.golang.org/grpc/transport.newHTTP2Server
google.golang.org/grpc/transport/http2_server.go:226 +0x97c
Note that the above is after a dedup operation, so it shows the same stack trace
existing 119 times. See the "Dedup goroutines" section.
Diff Two Goroutine Dumps
>> l, c, r = x.diff(y)
>> l
# of goroutines: 574
IO wait: 147
chan receive: 1
runnable: 3
select: 421
syscall: 2
>> c
# of goroutines: 651
IO wait: 157
runnable: 4
select: 489
semacquire: 1
>> r
# of goroutines: 992
IO wait: 229
chan receive: 49
chan send: 4
runnable: 31
running: 1
select: 594
semacquire: 84
It returns three values: the dump var containing goroutines only appear in
x (the left side), the dump var containing goroutines appear in both x and y,
the dump var containing goroutines only appear in y (the right side).
Dedup goroutines
Normally goroutine dump files contain thousands of goroutine entries, but
there are many duplicated traces. Function dedup() helps to identify these
duplicated traces by comparing the trace lines, and only keep one copy of
them. It greatly reduces the information explosion and make developers much
easier to focus on their problems.
>> a
# of goroutines: 2217
IO wait: 533
chan receive: 50
chan send: 4
runnable: 38
running: 1
select: 1504
semacquire: 85
syscall: 2
>> a.dedup()
Dedupped 2217, kept 46
>>
>> a
# of goroutines: 46
IO wait: 6
chan receive: 2
chan send: 2
runnable: 18
running: 1
select: 12
semacquire: 3
syscall: 2
To show goroutines with 5+ duplicates:
>> a.search("dups >= 5")
...
Save the Modified Goroutine Dump to a File
After a dump var is modified, it can be saved to a file:
>> a.save("pprof-deduped.log")
Properties of a Goroutine Dump Item
Each dump item has 5 properties which can be used in conditionals:, property, type, meaning, --------, -------, ---------------------------------------------------, id, integer, The goroutine ID., dups, integer, The number of duplicate traces., duration, integer, The waiting duration (in minutes) of a goroutine., lines, integer, The number of lines of the goroutine's stack trace., state, string, The running state of the goroutine., trace, string, The concatenated text of the goroutine stack trace., ## Functions in Conditionals
The following functions can be used in defining conditionals:, function, args, return value, meaning, --------, --------------, ------------, -----------------------------------------------------, contains, string, string, bool, Returns true if the first arg contains the second arg, lower, string, string, Returns the lowercased string of the input., upper, string, string, Returns the uppercased string of the input., Example:
>> original.search("contains(lower(trace), 'handlestream')")