On Mon, Apr 20, 2020 at 8:35 PM asaxena via golang-nuts < golang-nuts@googlegroups.com> wrote:
> Hi, > > I am trying CPU profiling a program that runs for an hour. However when I > start pprof it says Total samples are only for 1.32 min. Why are the > samples not collected for the whole duration of the program ? Is there a > missing setting I need to enable ? > It sounds like it was collected fro the duration of the program (see below), no additional configuration needed. > > Duration: 1.14hrs, Total samples = 1.32mins ( 1.94%) > This generally means that your process only used (roughly) 1.32 minutes of CPU-time over the 1.14hrs of the profile. Equivalent to an average CPU-usage of the 1.94% it listed. My usual inference from this kind of profile is that this program is not CPU-bound and instead I/O or network-bound. CPU-profiling is only useful for debugging cpu-bound operations, it doesn't tell you where operations were blocked, contending, etc. Diego's suggestion of instrumenting your code with some sort of metrics library (I'm a fan of opencensus's stats <https://opencensus.io/quickstart/go/metrics/> + prometheus <https://prometheus.io/>) is rather useful for tracking aggregate stats. In general, though, if you have a specific request/process you want to find the bottleneck in, it's hard to get away from tracing. I've used opentracing with Zipkin <https://pkg.go.dev/github.com/openzipkin-contrib/zipkin-go-opentracing?tab=doc>, but most recently I use opencensus tracing <https://opencensus.io/quickstart/go/tracing/> with stackdriver <https://opencensus.io/exporters/supported-exporters/go/stackdriver/>. For a single process, though I just use opencensus's zpages <https://opencensus.io/zpages/go/> to get a view of the current trace-spans on that process. > > Thanks. > > -- > You received this message because you are subscribed to the Google Groups > "golang-nuts" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to golang-nuts+unsubscr...@googlegroups.com. > To view this discussion on the web visit > https://groups.google.com/d/msgid/golang-nuts/a13db751-0f65-4b0b-aaf3-f39bc29e21cf%40googlegroups.com > <https://groups.google.com/d/msgid/golang-nuts/a13db751-0f65-4b0b-aaf3-f39bc29e21cf%40googlegroups.com?utm_medium=email&utm_source=footer> > . > -- You received this message because you are subscribed to the Google Groups "golang-nuts" group. To unsubscribe from this group and stop receiving emails from it, send an email to golang-nuts+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/golang-nuts/CANrC0BizHrEy73JWJZHPrVx2Wb91z0vPj87HgLcg6nu1ydg0Mg%40mail.gmail.com.
