Speed » History » Version 4
Chris Cannam, 2014-05-07 01:38 PM
1 | 1 | Chris Cannam | h1. Speed |
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2 | 1 | Chris Cannam | |
3 | 1 | Chris Cannam | We want to make the plugin as fast as possible, but I think there's a case to be made for providing fast and slow modes (see [[Possibilities for Plugin Parameters]]). |
4 | 1 | Chris Cannam | |
5 | 1 | Chris Cannam | In "fast" mode we should have the aim of producing a reasonable transcription in faster than real-time on any computer from the past 5 years or so. "Slow" mode has no particular speed constraint, simply as fast as possible an implementation of the best results we can easily do. |
6 | 1 | Chris Cannam | |
7 | 1 | Chris Cannam | See the "timing":/projects/silvet/repository/show/testdata/timing directory in the repo for timing tests. These are all carried out on a Thinkpad T540p with Intel i5-4330M under 64-bit Linux. |
8 | 1 | Chris Cannam | |
9 | 1 | Chris Cannam | Work so far: |
10 | 1 | Chris Cannam | |
11 | 2 | Chris Cannam | * Pre-optimisation, commit:ce64d11ef336 (release build) takes 104 seconds to process a 43.5-second file. (For reference, a debug build takes over 850 seconds.) |
12 | 2 | Chris Cannam | |
13 | 2 | Chris Cannam | * Testing where the time is spent: |
14 | 4 | Chris Cannam | ** Removing the unused Vamp plugin outputs: no more than 1 second difference |
15 | 4 | Chris Cannam | ** Removing debug printouts: no more than 1 second difference |
16 | 4 | Chris Cannam | ** Adjusting the CQ resampler parameters to allow a lower SNR: no more than 1 second difference |
17 | 4 | Chris Cannam | ** Halving the number of EM iterations: reduces runtime dramatically, to 59 sec. If this is linear, then EM (rather than CQ etc) must be taking around 86% of the total time. |