3f205ec3e9
This PR adds support for importing from Google's pprof format, which is a gzipped, protobuf encoded file format (that's incredibly well documented!) The [pprof http library](https://golang.org/pkg/net/http/pprof/) also offers an output of the trace file format, which continues to not be supported in speedscope to date (See #77). This will allow importing of profiles generated by the standard library go profiler for analysis of profiles containing heap allocation information, CPU profile information, and a few other things like coroutine creation information. In order to add support for that a number of dependent bits of functionality were added, which should each provide an easier path for future binary input sources - A protobuf decoding library was included ([protobufjs](https://www.npmjs.com/package/protobufjs)) which includes both a protobuf parser generator based on a .proto file & TypeScript definition generation from the resulting generated JavaScript file - More generic binary file import. Before this PR, all supported sources were plaintext, with the exception of Instruments 10 support, which takes a totally different codepath. Now binary file import should work when files are dropped, opened via file browsing, or opened via invocation of the speedscope CLI. - Transparent gzip decoding of imported files (this means that if you were to gzip compress another JSON file, then importing it should still work fine) Fixes #60. -- This is a [donation motivated](https://github.com/jlfwong/speedscope/issues/60#issuecomment-419660710) PR motivated by donations by @davecheney & @jmoiron to [/dev/color](https://www.devcolor.org/welcome) 🎉
54 lines
654 B
Go
54 lines
654 B
Go
package main
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import "flag"
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import "runtime/pprof"
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import "os"
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var cpuprofile = flag.String("cpuprofile", "", "write cpu profile to file")
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func alpha() {
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z := 3
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for i := 0; i < 100000; i++ {
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z *= 3
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}
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}
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func beta() {
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z := 3
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for i := 0; i < 100000; i++ {
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z *= 3
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}
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}
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func delta() {
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z := 3
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for i := 0; i < 100000; i++ {
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z *= 3
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}
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alpha()
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beta()
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}
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func gamma() {
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z := 3
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for i := 0; i < 100000; i++ {
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z *= 3
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}
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}
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func main() {
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flag.Parse()
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if *cpuprofile != "" {
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f, _ := os.Create(*cpuprofile)
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pprof.StartCPUProfile(f)
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defer pprof.StopCPUProfile()
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}
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for i := 0; i < 10000; i++ {
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alpha()
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beta()
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delta()
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gamma()
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}
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}
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