## COSMO

swMATH ID: | 40080 |

Software Authors: | Michael Garstka, Mark Cannon, Paul Goulart |

Description: | COSMO: A conic operator splitting method for convex conic problems. This paper describes the Conic Operator Splitting Method (COSMO) solver, an operator splitting algorithm for convex optimisation problems with quadratic objective function and conic constraints. At each step the algorithm alternates between solving a quasi-definite linear system with a constant coefficient matrix and a projection onto convex sets. The low per-iteration computational cost makes the method particularly efficient for large problems, e.g. semidefinite programs that arise in portfolio optimisation, graph theory, and robust control. Moreover, the solver uses chordal decomposition techniques and a new clique merging algorithm to effectively exploit sparsity in large, structured semidefinite programs. A number of benchmarks against other state-of-the-art solvers for a variety of problems show the effectiveness of our approach. Our Julia implementation is open-source, designed to be extended and customised by the user, and is integrated into the Julia optimisation ecosystem. |

Homepage: | https://arxiv.org/abs/1901.10887 |

Source Code: | https://github.com/oxfordcontrol/COSMO.jl |

Dependencies: | Julia |

Keywords: | Optimization and Control; arXiv:math.OC |

Related Software: | OSQP; SCS; Mosek; ARPACK; SDPT3; JuMP; Julia; NETLIB LP Test Set; SDPLIB; QPALM; GitHub; HSL-VF05; MINRES; CUTEst; MINRES-QLP; qpOASES; Ipopt; Gurobi; ProxSDP; lobpcg.m |

Cited in: | 7 Publications |

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### Cited by 10 Authors

4 | Goulart, Paul J. |

3 | Rontsis, Nikitas |

2 | Nakatsukasa, Yuji |

1 | Banjac, Goran |

1 | Cannon, Mark |

1 | Garstka, Michael |

1 | Huang, Aiqun |

1 | Lygeros, John |

1 | O’Donoghue, Brendan |

1 | Osborne, Michael A. |

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### Cited in 6 Serials

### Cited in 3 Fields

6 | Operations research, mathematical programming (90-XX) |

4 | Numerical analysis (65-XX) |

1 | Computer science (68-XX) |