Support pprof profiling in BadWolf #155
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rogerlucena
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thiagovas
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Nov 3, 2020
Tati1701
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Nov 3, 2020
| @@ -175,6 +220,59 @@ func REPL(od storage.Store, input *os.File, rl ReadLiner, chanSize, bulkSize, bu | |||
| done <- false | |||
| continue | |||
| } | |||
| if strings.HasPrefix(l, "start profiling") { | |||
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For a separate PR/Unralated to your changes:
Consider updating the loop to have a switch instead of several if strings.HasPrefix checks.
Remember: in Go, switch statements are more general than in other languages, so you can have cases checking for HasPrefix.
https://golang.org/doc/effective_go.html#switch
Besides being more readable, it can probably simplify the done <- false/continue repetitions. You might want to look at labels to control the flow here, rather than using the channel :)
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Thank you Tati! It is cool that switch can be this general in Go, we will keep this in mind for a future PR as well. =]
rbkloss
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Nov 3, 2020
… appended to the same files
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This PR comes to allow the user to have more visibility on latency and memory metrics when using BadWolf, adding support for pprof profiling through BadWolf's CLI.
When in the terminal, after already entering the BadWolf's CLI with the command
bw bql, the user can now write:To start
pprofprofiling. The user can also specify the CPU profiling rate with the-cpurateflag below:Similarly, to stop it they can just write:
With profiling enabled, the metrics for latency and memory consumption for the BQLs executed will be printed into two files,
cpuprofileandmemprofile, that can then be consumed and visualized through thego pprofCLI tool.Commands such as
go tool pprof -http=":8081" bw cpuprofileopen in the browser an interface to visualize the CPU metrics: the user can see the graph of function calls made and the latencies involved, useful to identify bottlenecks; they can visualize the correspondent Flame Graph as well, and also an ordered list of the heaviest function calls made. Another useful command isgo tool pprof -pdf bw cpuprofile > cpuprofile.pdfto generate pdfs from the profiling files. Withmemprofilethe previouspprofcommands work similarly.