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41 lines
1.6 KiB
Plaintext
41 lines
1.6 KiB
Plaintext
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This directory contains the evaluation of the multi-core implementation
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in the decoder. The baseline is the performance before the addition of
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the DecodeManager class.
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Tests were performed on the following systems:
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- eLux RP Atom N270 1.6 GHz
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- Lubuntu 13.10 i.MX6 Quad 1.2 GHz
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- Fedora 22 i7-3770 3.4 GHz
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- Windows Vista Core 2 Duo E7400 2.8 GHz
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- Windows 10 i3-4170 3.7 GHz
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- OS X 10.6 Core 2 Duo 2.53 GHz
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- OS X 10.11 i5 2.3 GHz
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The systems were tested with:
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a) The old, baseline code
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b) The new code with all CPUs enabled
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c) The new code with only one CPU enabled
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The test itself consists of running decperf on the test files from the
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TurboVNC project. Rate of decoding is then compared to the baseline.
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Note that the CPU time is divided by core usage in the multi CPU cases
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in order to derive total decoding time. This method is sensitive to
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other load on the system.
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On average, there is no regression in performance for single CPU
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systems. This however relies on the addition of the single CPU shortcut
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in DecodeManager. Without that the performance sees a 10% lower rate.
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Dual CPU systems see between 20% and 50% increase, and the quad core
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systems between 75% and 125% on average. OS X is an outlier though in
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that it gets a mere 32% increase on average. It is unknown why at this
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point and tracing doesn't reveal anything obvious. It may be because it
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is not a true quad core system, but rather uses HyperThreading.
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So in summary, the new code can do a noticeable improvement on decoding
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time. However it does so at a cost of efficiency. Four times the CPUs
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only gives you about twice the performance. More improvements may be
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possible.
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