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* Source listing handles missing binaries and addresses.

Some profiles can contain locations without an address, or reference
binaries/libraries that are not available. Treat these better when
producing source listings by using any source information present
directly in the profile.Location.

Details:

If a location does not have an address, create a synthetic address
that does not fall in a known mapping.

If a location references an object file that is not found, use any
file/line information baked directly in the location.

Tweaked generated html to clicking for source lines that have no
inlining/assembly to display.

* Panic on attempt to synthesize address for Loc with non-zero addr.
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Introduction

pprof is a tool for visualization and analysis of profiling data.

pprof reads a collection of profiling samples in profile.proto format and generates reports to visualize and help analyze the data. It can generate both text and graphical reports (through the use of the dot visualization package).

profile.proto is a protocol buffer that describes a set of callstacks and symbolization information. A common usage is to represent a set of sampled callstacks from statistical profiling. The format is described on the proto/profile.proto file. For details on protocol buffers, see https://developers.google.com/protocol-buffers

Profiles can be read from a local file, or over http. Multiple profiles of the same type can be aggregated or compared.

If the profile samples contain machine addresses, pprof can symbolize them through the use of the native binutils tools (addr2line and nm).

This is not an official Google product.

Building pprof

Prerequisites:

To build and install it, use the go get tool.

go get -u github.com/google/pprof

Remember to set GOPATH to the directory where you want pprof to be installed. The binary will be in $GOPATH/bin and the sources under $GOPATH/src/github.com/google/pprof.

Basic usage

pprof can read a profile from a file or directly from a server via http. Specify the profile input(s) in the command line, and use options to indicate how to format the report.

Generate a text report of the profile, sorted by hotness:

% pprof -top [main_binary] profile.pb.gz
Where
    main_binary:  Local path to the main program binary, to enable symbolization
    profile.pb.gz: Local path to the profile in a compressed protobuf, or
                   URL to the http service that serves a profile.

Generate a graph in an SVG file, and open it with a web browser:

pprof -web [main_binary] profile.pb.gz

Run pprof on interactive mode:

If no output formatting option is specified, pprof runs on interactive mode, where reads the profile and accepts interactive commands for visualization and refinement of the profile.

pprof [main_binary] profile.pb.gz

This will open a simple shell that takes pprof commands to generate reports.
Type 'help' for available commands/options.

Run pprof via a web interface

If the -http flag is specified, pprof starts a web server at the specified host:port that provides an interactive web-based interface to pprof. Host is optional, and is "localhost" by default. Port is optional, and is a random available port by default. -http=":" starts a server locally at a random port.

pprof -http=[host]:[port] [main_binary] profile.pb.gz

The preceding command should automatically open your web browser at the right page; if not, you can manually visit the specified port in your web browser.

Using pprof with Linux Perf

pprof can read perf.data files generated by the Linux perf tool by using the perf_to_profile program from the perf_data_converter package.

Viewing disassembly on Windows

To view disassembly of profiles collected from Go programs compiled as Windows executables, the executable must be built with go build -buildmode=exe. LLVM or GCC must be installed, so required tools like addr2line and nm are available to pprof.

Further documentation

See doc/README.md for more detailed end-user documentation.

See CONTRIBUTING.md for contribution documentation.

See proto/README.md for a description of the profile.proto format.

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