URL:
<http://savannah.gnu.org/bugs/?40639>
Summary: GNU Make with profiling information
Project: make
Submitted by: eddyp
Submitted on: Tue 19 Nov 2013 21:31:16 GMT
Severity: 3 - Normal
Item Group: Enhancement
Status: None
Privacy: Public
Assigned to: None
Open/Closed: Open
Discussion Lock: Any
Component Version: SCM
Operating System: Any
Fixed Release: None
Triage Status: None
_______________________________________________________
Details:
Hello all,
For perfomance analysis of the build systems I maintain I have found the need
for GNU Make to provide profiling information so it can help the developer
with spotting the slow parts of the build system.
I have found others had the same need (see also the related patch #7447), but
nobody was motivated enough to refine the patch to something useful.
I have taken the crude work done by OpenShift guest <zlq...@daum.net> on
profiling for make 3.82, I reworked it and updated to on top of the master
version. I now I consider the profiling feature ready to be proposed for
review.
Here is how it looks when used:
0 eddy@heidi ~/usr/src/make/make-profiler $ ./make -P"target=%N start=%S
duration=%D" >/dev/null
target=all start=1384896401494 duration=0
target=all-am start=1384896401494 duration=0
target=all start=1384896401498 duration=0
target=all-am start=1384896401498 duration=0
target=all start=1384896401508 duration=0
target=all-yes start=1384896401508 duration=0
target=check-macro-version start=1384896401503 duration=5
target=all start=1384896401512 duration=0
target=all-am start=1384896401512 duration=0
target=all-am start=1384896401539 duration=0
target=config.h start=1384896401527 duration=5
target=all-recursive start=1384896401487 duration=53
target=all start=1384896401466 duration=75
target=config.h start=1384896401462 duration=4
The new profiling parameter is
-P[FMT]/--profile[=FMT]/--profile-format[=FMT].
The man page is also updated, so here is a quote:
-P[FMT], --profile[=FMT], --profile-format[=FMT]
Print to stderr profiling information for each run target, one
line per target, according to format string FMT. The FMT string
can contain plain text and the following formatting sequences:
%N target name
%L recursion level for the make instance processing the target
%P pid of the make instance processing the target
%S start target timestamp (in miliseconds since 1 ian 1970)
%E end target timestamp (in miliseconds since 1 ian 1970)
%D difference between the target start and end timestamps (in
miliseconds)
%% literal %
If the option is repeated, all the FMT parameters are concate‐
nated internally into a single formatting string.
Any unrecognized % sequence will generate an error. If the FMT
string ends with a single % character, then that character will
be ignored.
The default FMT string is [PROF:%N:lvl=%L:pid=%P] %S;%E;%D.
My git repo is at (work is rebased on top of official master):
https://github.com/eddyp/make-profiler
The first results I got based on Make's own build system can be visible in
this screenshot:
https://github.com/eddyp/make-profiler/blob/master-rebase/make-j_profile.png
Please tell me what you think, or tell me if you prefer a unified diff patch
attached to this report for a review. Or maybe you prefer me to squash the
profile related changes into a single commit.
Notes:
- My master-rebase branch, as the name suggests, will be rebased
- I am aware the code in my master-rebase contains the more mature profiling
feature code and the less polished graph code; I will separate the profiling
code from the graph code on different branches, but I have had the need to use
both features
_______________________________________________________
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<http://savannah.gnu.org/bugs/?40639>
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