On Tue, Jan 22, 2019 at 11:21 AM Patrik Iselind <patrik....@gmail.com> wrote: > > I'm looking at memory profiles and have a hard time interpreting what I see. > I'm trying to better understand what I am looking at in `go tools pprof` why > looking at the raw data. All 'groups' at the end of output from > /debug/pprof/heap have lines that begin with "0: 0 [0: 0] @0x.......". It's > these zeros I cannot wrap my head around. > > As I read the source code for pprof, I interpret the zeros as; there are zero > inuse object and there has never been any allocations for the following call > stack. This seem like a really strange interpretation, why save a call stack > from which there has never been made any allocations? How am I supposed to > interpret it? > > That line format follows the format of "n: m [N: M] @0x...." where, as I > interpret the source code, we have > n = number of objects that are in use and allocated using the call stack just > below > m = how many bytes these n objects occupy > N = number of object ever allocated using the call stack just below > M = how many bytes these m objects occupy > > n and m has to do with what is called the inuse_object and inuse_space > respectively. > N and M has to do with what is called the alloc_object and alloc_space > respectively. > > It might just be my interpretation of inuse and alloc. I see inuse as > something that still has a reference to it while alloc show the total count > of objects allocated at a certain call stack. Given this interpretation, I > cannot see how zeros make sense. > > Please help me understand.
I'm not sure but I think you will get entries like that for cases for which an allocation occurred but the memory was then freed by the GC before the profile record was requested. Ian -- 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. For more options, visit https://groups.google.com/d/optout.
