Sage Weil wrote: > Hey Mark, > > I just watched Brendan Gregg's talk at SCALE (which was extremely good) > and one of the things he mentioned is the importance of > -fno-omit-frame-pointer. I notice we are setting it via do_autogen.sh > (i.e., for developers) but not in the production builds. Should we be? > I think it's important to be able to get meaningful callgraph output from > production deployments and I suspect there is minimal performance impact. > > http://www.slideshare.net/brendangregg/scale2015-linux-perfprofiling
I personally favor DWARF-based unwinding - for one, on register-starved architectures such as 32-bit x86, the frame pointer itself can skew performance. With regard to it inflating instance size, that's something that can be mitigated - via split debuginfo (only pull in the ones you actually need), compressed debug info (zlib -9 shrinks it a good bit), and semantic deduplication/compression with dwz. -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
