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The code calculates different checksums of the same data, and this is an embarrassingly parallel problem: the data is only read and the checksums are independent of one another. By offloading one checksum calculation to an auxiliary thread the total calculation time is reduced from the sum of two calculations' times to the duration of the calculation which takes longer. The performance was measured by changing the extension code to perform the CPU-bound checksum calculation 100 times in a row, loading the data from the disk just once. CRC and AR columns show the times it takes to calculate respective checksums, seq and par columns show the times it takes to calculate both checksum types sequentially and in parallel. The measured times are accurate to about 0.1 second: length CRC [s] AR [s] AR/CRC seq [s] par [s] par/seq 5:47.27 3.9 1.5 0.38 5.4 3.9 0.72 15:52.70 10.6 4.1 0.39 14.7 10.7 0.73 30:45.36 20.6 8.1 0.39 28.7 20.7 0.72 45:45.05 30.7 12.0 0.39 42.7 30.8 0.72 62:00.37 41.5 16.3 0.39 57.5 41.8 0.73 It appears that the theoretical performance improvement is about 28%, but the benchmark is artificial, and the real-life performance will be limited mainly by I/O: the CPU-bound part constitutes a small fraction of the total runtime. In any case, the threading code is not as complex as I was afraid it would be, so in the end I think it's worth keeping. |
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| .. | ||
| audio | ||
| disc | ||
| rip | ||
| __init__.py | ||
| arver_bin_parser.py | ||
| arver_discinfo.py | ||
| arver_main.py | ||
| arver_ripinfo.py | ||
| version.py | ||