The developer docs: ; The output of go tool pprof –help (I pasted the output on my. Step #5: run go tool pprof. Pass your binary location, and the location of the cpu. pprof file as returned when running your program. You can. To build and install it, use the go get tool. go get -u Remember to set GOPATH to the directory where you want pprof to be installed.

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There is also a standard HTTP interface to profiling data. Request func Profile w http. Package pprof writes runtime profiling data in the format expected by the pprof visualization tool. Now the samples we are examining are memory allocations, not clock ticks. Cmdline responds with the running program’s command line, with arguments separated by NUL bytes. Profiling a Go toil The first step to profiling a Go program is to enable profiling.

pprof – The Go Programming Language

It is preserved for backwards compatibility. What kinds of profiles can I get? Such a global variable is bad engineering practice, of course: This puts us into an interactive mode where we run top. If there has been no garbage collection at all, the heap profile reports all known allocations.


Profiling Go programs with pprof

Add stores value in an internal map, so value must be suitable for use as a map key and will not be garbage collected until the corresponding call to Remove.

Click a node to visit that function’s source code.

It was generating these heap profiles named like pprof. For compatibility with various tools that read pprof data, profile names should not contain spaces.

Instead of using a map, we can use a simple slice to list the elements.

To find out why the garbage collector is running so much, we have to find out what is allocating memory. Context with the given labels added.

The stylistic changes have only a minor effect on the run time: Functions may be omitted if they were determined to be unreachable in the particular programs or tests that were analyzed.

An edge from box X to box Y indicates that X calls Y; the number along the gool is the number of times that call appears in a sample. FindLoops function was rool in DFS no longer appears in the profile, and the rest of the program runtime has dropped too. Let’s look at main. If a write to w returns an error, WriteTo returns that error.


In the call graph viewer below, each node is a function belonging to this package and its children are the functions it calls—perhaps dynamically. SetBlockProfileRate in your program:. Terms of Service Privacy Policy. Context, labels LabelSet, f func context. This contains 1 sample.

Println “hello world” pprf wg sync. I can also do the same thing outside interactive mode with go tool pprof -top http: A small fragment of the full graph looks like:. I think the Samples are the most important part of the profile. For example, the following command runs benchmarks in the current directory and writes the CPU and memory profiles to cpu.

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