Known Bugs and Problems

• Twiss output contains entries for the higher-order dispersion, tune shifts with amplitude, higher-order chromaticity, and tune spreads due to chromaticity and amplitude even when these are not calculated, which is potentially misleading. The values are zero when the calculation is not requested.
• Parallel efficiency can depend strongly on the particular problem and the amount of outupt. For example, a simulation without collective effects and with minimal output will show excellent scaling up to 500 or 1000 processors, while a simulation dominated by collective effects with frequent output may roll off with only 30 processors. Work continues to improve the scaling.