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Date Submitted

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0015877

CMake

public

2015-12-11 00:50

2016-06-10 14:31

Reporter

Jim King

Assigned To

Kitware Robot

Priority

normal

Severity

minor

Reproducibility

always

Status

closed

Resolution

moved

Platform

Linux

Ubuntu

OS Version

14.04 LTS

Product Version

CMake 3.4

Target Version

Fixed in Version

Summary

0015877: Performance regression in file generation

Description

There was a significant performance regression between CMake 2.8 and 3.4
between "-- Configuring done" and "--Generating done" phases. We have a rather
large project with a number of files and here are the timing results:

CMake-3.4

39.27user 10.14system 0:50.62elapsed 97%CPU (0avgtext+0avgdata 119384maxresident)k
40inputs+167408outputs (0major+254266minor)pagefaults 0swaps

CMake-2.8

21.97user 8.09system 0:32.09elapsed 93%CPU (0avgtext+0avgdata 163040maxresident)k
8400inputs+172200outputs (30major+266779minor)pagefaults 0swaps

We're generating on Ubuntu 14.04 LTS with the command:
CC=clang CXX=clang++ time /usr/bin/cmake -G"Eclipse CDT4 - Unix Makefiles"

I could not find a defect for this so I decided to add one.

Steps To Reproduce

See description.

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Notes
(0039968) Bartosz (reporter) 2015-12-11 06:21	Could you please check in which exactly version this rergession was introduced? Is it CMake 3.0 itself?

(0039969) Jim King (reporter) 2015-12-11 09:38	Sure, I might be able to do this today - I will let you know the results.

(0042899) Kitware Robot (administrator) 2016-06-10 14:29	Resolving issue as `moved`. This issue tracker is no longer used. Further discussion of this issue may take place in the current CMake Issues page linked in the banner at the top of this page.

Issue History
Date Modified	Username	Field	Change
2015-12-11 00:50	Jim King	New Issue
2015-12-11 06:21	Bartosz	Note Added: 0039968
2015-12-11 09:38	Jim King	Note Added: 0039969
2016-06-10 14:29	Kitware Robot	Note Added: 0042899
2016-06-10 14:29	Kitware Robot	Status	new => resolved
2016-06-10 14:29	Kitware Robot	Resolution	open => moved
2016-06-10 14:29	Kitware Robot	Assigned To	=> Kitware Robot
2016-06-10 14:31	Kitware Robot	Status	resolved => closed