OutputModel performance

[Kevin Funk]

On Wednesday 06 February 2013, 17:32, Alexander Shaduri wrote:
> Hello,
> 
> On Wed, 06 Feb 2013 13:25:17 +0100
> 
> Kevin Funk wrote:
> > I recently noticed that I get serious UI lockups when running a 'make
> > install' job inside KDevelop for larger projects such as kdelibs. 'make
> > install' here may produce roughly ~4500 lines of output in just a few
> > seconds.
> > ...
> > So, the question here:
> > - Did anyone of you guys experience similar issues just to begin with?
> 
> Just from the user's point of view:
> KDevelop is essentially unusable when I'm compiling my project (9 parallel
> make jobs). It seems that the outputview just cannot handle it quickly
> enough.
> 
> It's a typical cmake/Qt project compiled with make -j9, the full compilation
> takes about 30 seconds and produces ~500KB output (~2300 lines).
> CMAKE_VERBOSE_MAKEFILE is on.
> 
> If I set make jobs to 1 or CMAKE_VERBOSE_MAKEFILE to off, it's all fine.
> 
> I'd be grateful if you added this as a test case. Compiling, say, KDevelop
> with the same settings should give you the same drop in performance.
> 
> Thanks,
> Alexander

Just for the record -- I just measured the time it takes to complete 
addLineBatch():

(...)
KDevelop::OutputModel::addLineBatch: elapsed time:  20 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  10 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  22 ms, processed lines: 2
KDevelop::OutputModel::addLineBatch: elapsed time:  8 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  8 ms, processed lines: 2
KDevelop::OutputModel::addLineBatch: elapsed time:  7 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  7 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  12 ms, processed lines: 3
KDevelop::OutputModel::addLineBatch: elapsed time:  9 ms, processed lines: 2
KDevelop::OutputModel::addLineBatch: elapsed time:  7 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  8 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  11 ms, processed lines: 4
KDevelop::OutputModel::addLineBatch: elapsed time:  7 ms, processed lines: 1
KDevelop::OutputModel::addLineBatch: elapsed time:  7 ms, processed lines: 1
(...)

IMO that clearly shows that this takes way too much processing time / line.

Maybe Morten has an idea how to improve this? I won't have time before next 
week to work on this.

Greets

-- 
Kevin Funk