[Symphony-tickets] [SYMPHONY] #133: Performance issue: lp solve CPLEX vs Clp

[SYMPHONY]

#133: Performance issue: lp solve CPLEX vs Clp
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 Reporter:  anh509    |      Owner:  tkr
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  Not Sure  |    Version:  trunk (SVN)
 Keywords:            |
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 The attached problem is solved in a few seconds with Clp as the LP solver.
 The option file contains

 do_primal_heuristic 0
 prep_level 0

 and the build options are
 ../configure --enable-debug --enable-sensitivity-analysis --enable-tests

 When CPLEX is used, however, the variable branched on in the root node
 changes and we solve many more LPs in the root node and further
 iterations. We end up solving more nodes too. The violated cuts found are
 different with or without cgl cuts. SYM with CPLEX is built with

 ./configure --enable-debug --enable-sensitivity-analysis --with-cplex-
 lib=-L/usr/local/CPLEX_Studio_125/cplex/lib/x86-64_sles10_4.1/static_pic/
 -lcplex -lpthread -lm --with-cplex-
 incdir=/usr/local/CPLEX_Studio_125/cplex/include/ilcplex --with-lp-
 solver=cplex

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Ticket URL: <https://projects.coin-or.org/SYMPHONY/ticket/133>
SYMPHONY <http://projects.coin-or.org/SYMPHONY>
The SYMPHONY framework for parallel branch-and-cut algorithms.