MantisBT - CMake
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IDProjectCategoryView StatusDate SubmittedLast Update
0015877CMakeCMakepublic2015-12-11 00:502016-06-10 14:31
ReporterJim King 
Assigned ToKitware Robot 
PrioritynormalSeverityminorReproducibilityalways
StatusclosedResolutionmoved 
PlatformLinuxOSUbuntuOS Version14.04 LTS
Product VersionCMake 3.4 
Target VersionFixed in Version 
Summary0015877: Performance regression in file generation
DescriptionThere 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 ReproduceSee description.
Additional Information
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Issue History
Date ModifiedUsernameFieldChange
2015-12-11 00:50Jim KingNew Issue
2015-12-11 06:21BartoszNote Added: 0039968
2015-12-11 09:38Jim KingNote Added: 0039969
2016-06-10 14:29Kitware RobotNote Added: 0042899
2016-06-10 14:29Kitware RobotStatusnew => resolved
2016-06-10 14:29Kitware RobotResolutionopen => moved
2016-06-10 14:29Kitware RobotAssigned To => Kitware Robot
2016-06-10 14:31Kitware RobotStatusresolved => closed

Notes
(0039968)
Bartosz   
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   
2015-12-11 09:38   
Sure, I might be able to do this today - I will let you know the results.
(0042899)
Kitware Robot   
2016-06-10 14:29   
Resolving issue as `moved`.

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