[bind10-dev] discussion about the approach of gprof

[JINMEI Tatuya / 神明達哉]

At Wed, 8 Feb 2012 10:18:28 +0800,
zhanghaikuo <zhanghaikuo at cnnic.cn> wrote:

> If the GMON_OUT_PREFIX is defined as you said,the rule of profiling
> data file name is "GMON_OUT_PREFIX"+"PID" (PID is process ID).When
> you run bind10,all the sub-processes will get the same value of
> GMON_OUT_PREFIX and you don't know sub-processes's PID, so you don't
> know which profiling data file is for b10-auth,and which is for
> b10-resolver.

Ah, okay, understood.

I have a different, but possibly related question/comment.  I don't
think it a common operation to install executables built with -pg due
to its severe performance impact.  At least it would be very unlikely
that they are installed under production directory.  I suspect a
common practice would be to run it within the source tree, using the
run_bind10.sh script.

I suggest noting this (and how to do it) in the wiki page.

Now, the possibly related question to the original point: do we still
have the same-output-file problem if run it within the source tree?
If not, we'll not have to use GMON_OUT_PREFIX, much less modifying the
bind10 script.  We might still mention the tweak to the bind10 script
in case someone really wants to run it under an installed environment,
but I guess it would be a supplemental note.

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.