stiga-huang commented on pull request #1056: URL: https://github.com/apache/orc/pull/1056#issuecomment-1064683788
Tested with random unsigned numbers fitting into bitSize n with a given ratio of nulls. Reading 1B rows for each test. | bitSize | % nulls | baseline avg(s) | optimized avg(s) | Speedup | |---------|---------|-----------------|------------------|--------------| | 4 | 0% | 3.52 | 2.745 | 1.2823315118 | | 4 | 5% | 7.925 | 7.185 | 1.1029923452 | | 4 | 10% | 8.48 | 6.805 | 1.2461425422 | | 4 | 25% | 11.15 | 6.475 | 1.722007722 | | 4 | 50% | 11.135 | 6.47 | 1.7210200927 | | 8 | 0% | 3.51 | 2.73 | 1.2857142857 | | 8 | 5% | 7.89 | 7.13 | 1.1065918654 | | 8 | 10% | 8.47 | 6.795 | 1.2465047829 | | 8 | 25% | 9.93 | 6.44 | 1.5419254658 | | 8 | 50% | 11.145 | 6.465 | 1.7238979118 | | 16 | 0% | 3.53 | 2.745 | 1.2859744991 | | 16 | 5% | 7.925 | 7.155 | 1.107617051 | | 16 | 10% | 8.46 | 6.8 | 1.2441176471 | | 16 | 25% | 9.92 | 6.41 | 1.5475819033 | | 16 | 50% | 11.2 | 6.47 | 1.7310664606 | | 32 | 0% | 3.515 | 2.745 | 1.2805100182 | | 32 | 5% | 7.915 | 7.15 | 1.106993007 | | 32 | 10% | 8.475 | 6.815 | 1.2435803375 | | 32 | 25% | 9.935 | 6.48 | 1.5331790123 | | 32 | 50% | 11.175 | 6.485 | 1.7232074017 | | 32 | 100% | 2.19 | 2.145 | 1.020979021 | We can see speedup in all cases. Tested on Ubuntu16.04 with a 6 cores CPU (12 virtual cores) and 32GB RAM. CPU: Intel(R) Core(TM) i7-8700 CPU @ 3.20GHz -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: dev-unsubscr...@orc.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org
