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The method of discrete ordinates is commonly used to solve the Boltzmann radiation transport equation for applications ranging from simulations of fires to weapons effects. The equations are most efficiently solved by sweeping the radiation flux across the computational grid. For unstructured grids this poses several interesting challenges, particularly when implemented on distributed-memory parallel machines where the grid geometry is spread across processors. We describe an asynchronous,doi:10.1109/sc.2000.10030 dblp:conf/sc/PlimptonHBM00 fatcat:4ll4pyyygffwxlibvrxoxlrc4y