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Update PROFILING.md

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Neil Alexander 2020-12-03 13:48:02 +00:00
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@ -4,7 +4,7 @@ If you are running into problems with Dendrite using excessive resources (e.g. C
Dendrite contains an embedded profiler called `pprof`, which is a part of the standard Go toolchain. Dendrite contains an embedded profiler called `pprof`, which is a part of the standard Go toolchain.
### Enable the profiler ## Enable the profiler
To enable the profiler, start Dendrite with the `PPROFLISTEN` environment variable. This variable specifies which address and port to listen on, e.g. To enable the profiler, start Dendrite with the `PPROFLISTEN` environment variable. This variable specifies which address and port to listen on, e.g.
@ -19,7 +19,9 @@ WARN[2020-12-03T13:32:33.669405000Z] [/Users/neilalexander/Desktop/dendrite/inte
Starting pprof on localhost:65432 Starting pprof on localhost:65432
``` ```
### Profiling CPU usage All examples from this point forward assume `PPROFLISTEN=localhost:65432` but you may need to adjust as necessary for your setup.
## Profiling CPU usage
To examine where CPU time is going, you can call the `profile` endpoint: To examine where CPU time is going, you can call the `profile` endpoint:
@ -45,7 +47,7 @@ curl -O http://localhost:65432/debug/pprof/profile?seconds=30
This will block for the specified number of seconds, capturing information about what Dendrite is doing, and then produces a `profile` file, which you can send onward. This will block for the specified number of seconds, capturing information about what Dendrite is doing, and then produces a `profile` file, which you can send onward.
### Profiling memory usage ## Profiling memory usage
To examine where memory usage is going, you can call the `heap` endpoint: To examine where memory usage is going, you can call the `heap` endpoint:
@ -74,6 +76,6 @@ If you don't have the Go tools installed but just want to capture the profile to
``` ```
curl -O http://localhost:65432/debug/pprof/heap curl -O http://localhost:65432/debug/pprof/heap
`` ```
This will almost instantly produce a `heap` file, which you can send onward. This will almost instantly produce a `heap` file, which you can send onward.