coin-or/SYMPHONY

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SYMPHONY is an open-source solver, callable library, and development framework for mixed-integer linear programs (MILPs) written in C with a number of unique features

Stars: 77
Forks: 19
Open beginner issues: 0
Indexed issues: 69

Dominant language: C
License: No license data
Last GitHub push: Apr 25, 2026
Latest indexed: Sep 15, 2026
Contributing guide: No contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Open All

69 open issues indexed

manual does not list all possible status codes Open

R package

coin-or/SYMPHONY#158 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Unable to solve mspp16 Open

coin-or/SYMPHONY#157 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
symphony ignores OMP_NUM_THREADS Open

OMP

coin-or/SYMPHONY#156 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Implement adaptive cut generation in parallel Open

enhancement LP module

coin-or/SYMPHONY#15 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Save reduced cost fixing information Open

build enhancement

coin-or/SYMPHONY#16 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Document statistics Open

documentation enhancement

coin-or/SYMPHONY#18 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Update the applications to use the switch '-T' for testing purpose only Open

bug VRP application

coin-or/SYMPHONY#29 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Generated cuts in user_is_feasible() Open

enhancement LP module

coin-or/SYMPHONY#30 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Bad formatting in manual Open

bug documentation

coin-or/SYMPHONY#31 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add "deletable" field to cg_add_explicit_cut() Open

CutGenerator module enhancement

coin-or/SYMPHONY#33 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Change implementation of user_is_feasible() Open

enhancement LP module

coin-or/SYMPHONY#34 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Port drawgraph application to C++ Open

DrawGraph module enhancement

coin-or/SYMPHONY#36 · 6 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Interrupted nodes and warm starting Open

enhancement TreeManager module

coin-or/SYMPHONY#40 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
seg fault when solving empty problem in OsiSym Open

bug Master module

coin-or/SYMPHONY#47 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
problems with infeasible problems Open

bug Master module

coin-or/SYMPHONY#48 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
When program exits, print reason, rather than return code Open

enhancement Master module

coin-or/SYMPHONY#51 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Incorrect cast for 64 bit? Open

bug VRP application

coin-or/SYMPHONY#55 · 5 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Change configuration to use deection of header files Open

build enhancement

coin-or/SYMPHONY#58 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Get AMPL interface working Open

enhancement OSI

coin-or/SYMPHONY#59 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
MIP 2003 benchmarks Open

bug SPP+CUTS application

coin-or/SYMPHONY#64 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
stops prematurely on setting upperbound using -u flag. Open

bug

coin-or/SYMPHONY#67 · 8 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
adding multiple columns Open

enhancement OSI

coin-or/SYMPHONY#82 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
add a callback to print the symphony messages. Open

enhancement

coin-or/SYMPHONY#91 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
add a C function to get all the solutions of a bicriteria problem Open

enhancement

coin-or/SYMPHONY#92 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Add a function in the C interface which returns the version number of Symphony Open

enhancement

coin-or/SYMPHONY#93 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
add a new function in the C API to allow a premature stop of the solver. Open

bug

coin-or/SYMPHONY#94 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
add a new function in the C API to allow a premature stop of the solver. Open

enhancement

coin-or/SYMPHONY#95 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
convert from int to size_t the variable 'size' used in several data structures. Open

enhancement

coin-or/SYMPHONY#96 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
divide be zero possible at some places while calculating gap Open

bug

coin-or/SYMPHONY#98 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
shall_we_dive() calls find_tree_lb() Open

bug TreeManager module

coin-or/SYMPHONY#99 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
CglKnapsackCover possibly cuts off optimal solution Open

bug

coin-or/SYMPHONY#100 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
can not build vrp on 64 bit machine Open

bug VRP application

coin-or/SYMPHONY#104 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
abort on MIP Open

bug

coin-or/SYMPHONY#105 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Preprocessor doesn't work with multicriteria Open

bug Master module

coin-or/SYMPHONY#106 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Matlab Interface Open

documentation enhancement

coin-or/SYMPHONY#113 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
SYMPHONY does not find all non-dominated solutions Open

bug

coin-or/SYMPHONY#114 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
wrong optimum with bdver1 or bdver2 options Open

bug

coin-or/SYMPHONY#121 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
SYMPHONY unable to solve a problem that can be solved by COIN CLP/CBC and other solvers. Results with all these attached. SYMPHONY solves the LP relaxation and then quits with no additional information. Open

bug

coin-or/SYMPHONY#122 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Column names restricted to 30 chars Open

enhancement

coin-or/SYMPHONY#123 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
OsiSym doesn't seem to respect OsiNameDiscipline Open

bug LP module

coin-or/SYMPHONY#124 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
The default preprocessing level is too high Open

bug

coin-or/SYMPHONY#125 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Symphony hangs when loading a big problem which exhaust the available memory Open

bug

coin-or/SYMPHONY#126 · 0 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Error (lower bound decrease) Open

bug TreeManager module

coin-or/SYMPHONY#131 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Performance issue: lp solve CPLEX vs Clp Open

bug

coin-or/SYMPHONY#133 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
"sym_get_col_solution(): There is no solution!" error despite outputting the optimal solution Open

bug

coin-or/SYMPHONY#135 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026
"sym_add_col" works incorrectly (see details) [Okay with 5.5 but not 5.6 or trunk] Open

bug Master module

coin-or/SYMPHONY#136 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Trunk version with Cplex not solving the attached problem within 5 minutes- Clp seems to be fine Open

bug

coin-or/SYMPHONY#137 · 2 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Segmentation fault when using openmp Open

bug

coin-or/SYMPHONY#138 · 4 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
SYMPHONY Reports No solution Found Open

bug

coin-or/SYMPHONY#140 · 3 comments · 0 reactions · 1 assignee · Indexed Sep 15, 2026
Possible Bug - Failure to terminate Open

bug

coin-or/SYMPHONY#148 · 1 comment · 0 reactions · 1 assignee · Indexed Sep 15, 2026

coin-or/SYMPHONY

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