pprof broken in 1.2?

[Baron Schwartz]

I've been digging into pprof a bit and as it's pretty complex, I'm asking here first.

Our binaries built with 1.2 seem to give profiles that are mostly nonsense. For example, please see the attached image generated with "--web" from a busy binary. There is almost nothing mentioning the code we wrote; it's all standard libraries. And when I generate a list of symbols, almost everything seems to get lumped into some "etext" symbol, which I think explains why this image credits "etext" as the biggest user of CPU.

Are there problems with pprof in Go 1.2? Are there workarounds to get usable profiles from 1.2 binaries?

Thanks,

Baron

[Martin Angers]

Are you profiling on OSX with pprof data coming from a Linux server? I've seen the same behaviour (etext) in this situation. You should profile on Linux if this is the case.

[efredr...@gmail.com]

I've got the same problem, approximately. "etext" is profiled as using 30% of CPU time, but only one arrow comes into it from "System". This is on OSX with data from OSX.

[Dave Cheney]

The OSX kernel has a bug that prevents it from profiling accurately, please read http://research.swtch.com/macpprof

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[Niket Patel]

The OSX kernel has a bug that prevents it from profiling accurately, please read http://research.swtch.com/macpprof

Dave, 

Thanks a lot!  Awesome work by Russ. 

Did anyone tried it on latest Mavericks?

[Carlos Castillo]

I've used it since shortly after the release of Mavericks. Personally, I've experienced no problems as a result of the patch, and the profiles do work.

[Niket Patel]

Thanks, will try.

[Alejandro Martínez]

This is still going on in 1.2.1

So right now i'm forced to use pprof with 1.1.1.

Any ideas?

[Alejandro Martínez]

oh, by the way. This is on Ubuntu

Linux alebuntu64 3.5.0-21-generic #32-Ubuntu SMP Tue Dec 11 18:51:59 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

​

[Dave Cheney]

HI,

Can you please post some details. As far as this thread is concerned, the problem was resolved on 6/1/2014.