#5350: [with patch, needs review] sage-clone should use hard links for the build
directory
-------------------------+--------------------------------------------------
Reporter: burcin | Owner: burcin
Type: enhancement | Status: new
Priority: major | Milestone: sage-3.4
Component: misc | Keywords:
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We copy the build directory when we're cloning the tree. This wastes disk
space, and makes switching between branches slow, since new files need to
be loaded from disk while the previous ones might already be in the cache.
Attached patch to the scripts repository changes the sage-clone script to
hard link the build directory. On my laptop this saves >450 MB per clone.
{{{
bur...@karr ~/sage/sage-3.3/devel $ du -sh sage-*
593M sage-hl
125M sage-hl1
557M sage-main
}}}
Also the time to clone on my laptop goes from:
{{{
real 0m14.709s
user 0m4.640s
sys 0m1.924s
}}}
to
{{{
real 0m6.100s
user 0m4.712s
sys 0m0.928s
}}}
about 2.8 seconds of which is spent in the sage -b step.
Unfortunately, hard linking the .c, .cpp, and .h files doesn't work. This
might be a problem with how cython handles its output when the output file
is already present. This would save another ~100MB if it works.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/5350>
Sage <http://sagemath.org/>
Sage - Open Source Mathematical Software: Building the Car Instead of
Reinventing the Wheel
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