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grafana / alloy

OpenTelemetry Collector distribution with programmable pipelines
https://grafana.com/oss/alloy
Apache License 2.0
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Add `PPROF_MUTEX_PROFILING_PERCENT` env var details #1190

Closed clayton-cornell closed 3 months ago

clayton-cornell commented 4 months ago

PPROF_MUTEX_PROFILING_PERCENT enables the ability to retrieve data from the pprof mutex endpoint. It needs to be set to a whole number, for example 50 would profile 50% of the mutexes. 5 is likely a sufficient value. By default we sample 0.01 percent.

PPROF_BLOCK_PROFILING_RATE also allows tracking of mutexes for arcane reasons 1 tracks everything, 0 tracks nothing. Any value over 1 is treated as track anything over nanoseconds. By default we apply 10,000 for tracking.

Originally posted by @mattdurham in https://github.com/grafana/alloy/issues/1137#issuecomment-2206532926

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clayton-cornell commented 3 months ago

@mattdurham A question about the description provided for PPROF_MUTEX_PROFILING_PERCENT. The env var needs to be set to a while number (integer)? But... the default is 0.01 percent? Those two things don't add up for me. 0.01 isn't a whole number... should that have been 1 (meaning 1%)?