#12220: Updated CBC spkg
----------------------------------+-----------------------------------------
Reporter: ncohen | Owner: ncohen
Type: enhancement | Status: needs_work
Priority: major | Milestone: sage-4.8
Component: linear programming | Keywords:
Work_issues: | Upstream: N/A
Reviewer: | Author: Nathann Cohen
Merged: | Dependencies:
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Comment(by john_perry):
I think I've found threads.
In class `OsiClpSolverInterface`, there's a method,
{{{
ClpSimplex * getModelPtr();
}}}
It turns out that `ClpSimplex` inherits from `ClpModel`, wherein we find
{{{
void setNumberThreads(int value)
}}}
I am not sure it actually does anything with the threads, since the method
is commented with
{{{
/// Number of threads (not very operational)
}}}
but perhaps its descendant `ClpSimplex` does something with it.
To activate this, I am adding the following lines to
`OsiSolverInterface.pxd`:
{{{
cdef extern from "../../local/include/coin/ClpModel.hpp":
cdef cppclass ClpModel:
void setNumberThreads(int value)
int numberThreads()
cdef extern from "../../local/include/coin/ClpSimplex.hpp":
cdef cppclass ClpSimplex(ClpModel):
pass
cdef extern from "../../local/include/coin/OsiClpSolverInterface.hpp":
cdef cppclass OsiClpSolverInterface(OsiSolverInterface):
...
ClpSimplex * getModelPtr()
...
}}}
and in `__cinit__()` for `OsiClpSolverInterface.pyx` now sets it up as:
{{{
#self.si = new CoinModel(NULL)
cdef OsiClpSolverInterface * si_model = self.si
cdef ClpSimplex * model = si_model.getModelPtr()
import multiprocessing
model.setNumberThreads(multiprocessing.cpu_count())
}}}
As far as I can tell, this seems to work: it compiles & links, and Coin
seems to be working properly; that is, I'm not encountering any errors. I
don't know how to test it, though; any advice?
Also, does this look sensible? If so, I'll upload a new patch containing
all the changes I've made so far.
--
Ticket URL: <http://trac.sagemath.org/sage_trac/ticket/12220#comment:15>
Sage <http://www.sagemath.org>
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and MATLAB
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