[sldev] Complete viewer compilation benchmarks

[Dale Glass]

В сообщении от 1 апреля 2007 06:28 James Cook написал(a):
> This is a great analysis.  Thanks for sharing.
>
> My own internal tests with building Second Life on Windows, Mac and
> Linux show that build time is almost completely CPU bound.  The
> best way to get faster builds is to find more workstations for
> Incredibuild, distcc, or your distributed build system of choice. 
> :-)
Definitely. But not all of us can afford such things :-)

An unexpected result was finding that Gentoo compiles 15% faster 
(although versions weren't identical), but runs scons two times 
slower.

Perhaps somebody here with Python knowledge could take a look at scons 
and optimize it a bit? I still have all the required data here, and 
will volunteer to run tests for anybody who has any ideas of what 
makes the difference between Gentoo and Ubuntu happen.


> Where a RAM disk or faster hard drive might matter is for linking. 
> Link times are primarily I/O bound.  A 10K RPM disk will speed
> linking by 30% or more.  See below.
Interestingly, my tests disagree with that. With enough RAM present, a 
full compile time is improved only by 1.5% if you have a perfect disk 
(RAM disk)

Link time improves by 46%, but only if there's no data cached. If it 
is, the difference isn't measurable. So long you have enough RAM to 
keep the data cached, a faster disk isn't needed. 

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