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Published byJacob Lloyd Modified over 2 years ago

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4TH MASTS MEETING Konstantinos Kyriakopoulos Loughborough University

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2 Research Done Implementation of the KS statistic algorithm for CoMo v0.2 Wavelet decomposition and reconstruction written in C Compression of Network Performance Measurements using Wavelets and DCT MRTG monitoring of test network

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3 Compression of Network Performance Measurements DCT and WT with 75% (L2) and 93% (L4) reduction Bursty and non bursty signals

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4 Constant 75% and 93% compression for Bursty signal SignalBursty TransformDCT WT Reduction75%93%75%93% Input (bytes)2592 Output (bytes)648164648164 Compression ratio1:41:15.81:41:15.8 Mean abs error5.398.054.357.44 Mean % error2.994.252.233.86

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5 Constant 75% and 93% compression for Non-Bursty signal SignalNon-Bursty with abrupt change TransformDCT WT Reduction75%93%75%93% Input (bytes)2688 Output (bytes)672168672168 Compression ratio1:41:161:41:16 Mean abs error0.802.130.441.55 Mean % error0.350.910.190.65

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6 Variable compression triggered by KS statistic KS statistic identifies general differences between 2 distributions Level of compression depends on the KS critical value: If KS value > Da then apply low compression else high

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7 Variable compression for Bursty signal SignalBursty TransformWavelet ReductionVariable reduction L2 and L4 Input file (bytes)2592 Output file (bytes)322 Compression ratio1:7.8 (similar to constant L3) Mean abs error6.46 Average % error3.34

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8 Variable compression for Non-bursty signal SignalNon-bursty TransformWavelet ReductionVariable reduction L2 and L4 Input file (bytes)2688 Output file (bytes)236 Compression ratio1:11.4 Mean abs error0.55 Average % error0.24

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9 Conclusions Wavelets adapt to sudden changes better than DCT For bursty signal, V.C. gives same results as a L3 WT For the non bursty signal V.C. gives a compression ratio close to that of a L4 WT while keeping the error close to an error of a L2 WT

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10 Future Work Wavelet module for CoMo Integration of KS and Wavelet modules Quantization of wavelet coefficients and application of Huffman coding SNMP query Cierna core switches??

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