Dear all; i benchchmark the dup() system call on 32 cores machine in FreeBSD-current8.0. The results are bad. The phenomenon is easy to come out. Each process(not thread) on the core dup() its private file, and close() in a tight loop. The time completing the parallel workload is considered as performance. At first, i think there are some locks. However, lock profiling in FreeBSD is strange and interesting. I attach the graph and lock profiling. Any ideas? Best Wishes! Yan
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