#11959: build spkgs in parallel by default
---------------------------+------------------------------------------------
Reporter: jhpalmieri | Owner: GeorgSWeber
Type: enhancement | Status: needs_review
Priority: minor | Milestone: sage-4.7.3
Component: build | Keywords: SAGE_PARALLEL_SPKG_BUILD MAKE -j
--jobs
Work_issues: | Upstream: N/A
Reviewer: | Author: John Palmieri
Merged: | Dependencies:
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Comment(by leif):
W.r.t. the Sage Installation Guide:
`export MAKE='make -jNUM'` is not ''"a common setting of `MAKE`"'', but a
shell command to set `MAKE`; `'make -jNUM'` is the setting. (This has
been in before.)
`s/`''won't need to use''`/`''won't need to set''`/` (dito)
`s/`''can speed up the process''`/`''can significantly speed up the
process''`/`
I'd omit ''"(Not all packages support this, but the ones for which this
could be problematic should automatically disable it.)"'' since this is
pretty irrelevant (or confusing); or rephrase it to say that a few
packages do not support building them with multiple jobs and hence are
built sequentially, although in parallel ''with other packages''.
In the warning, substitute ''one-processor'' by ''single-core CPU'' or
''single-core machine''. I'd also mention the platform (or operating
system) to which this apparently applies; in my experience it is a non-
issue on Linux. Attempting to build Sage with probably too many jobs
should in general not hurt; one can simply reduce the number of jobs upon
build errors and restart, or more precisely continue, the build afterwards
by again typing `make`.
Similar what I've said w.r.t. `README.txt` applies to the Installation
Guide.
Also we should somehow mention potential problems with ATLAS there, and
perhaps what I said about self-tuning packages in general (on sage-devel).
(Again, if ATLAS failed to build -- often just due to too high system load
-- one can simply type `make` again, perhaps multiple times, since there
are usually less packages left to build when `make` finally exits. If we
haven't already, we should also mention that CPU throttling aka power-
saving mode should be turned off; "on-demand" in contrast should be ok,
i.e., provided it works properly. [I don't know whether that's in the
`README.txt`; I think it is important enough that it should be there,
too.])
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/11959#comment:6>
Sage <http://www.sagemath.org>
Sage: Creating a Viable Open Source Alternative to Magma, Maple, Mathematica,
and MATLAB
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