## 5 Experimental Results
### Comparison with Standard Compressors.
\begin{table}
\begin{tabular}{l c c c c c c c} \hline \hline
**Source** & & **online:I** & **LZW** & **gzip -9** & **bzip2 -9** & **Re-Pair** & **LZMA** \\ \hline
**Repetitive Text** & Size (bytes) & & & & & & \\ _Escherichia\_Coli_ & \(112,689,515\) & \(12.43\) & \(25.46\) & \(37.64\) & \(26.98\) & \(9.60\) & \(4.43\) \\ _Para_ & \(429,265,758\) & \(4.48\) & \(23.56\) & \(27.04\) & \(26.15\) & \(2.74\) & \(1.24\) \\ _Cere_ & \(461,286,644\) & \(3.25\) & \(22.59\) & \(26.20\) & \(25.22\) & \(1.86\) & \(1.05\) \\ _influenza_ & \(154,808,555\) & \(4.57\) & \(11.55\) & \(6.87\) & \(6.59\) & \(3.26\) & \(1.55\) \\ _coreutils_ & \(205,281,778\) & \(5.23\) & \(22.24\) & \(24.32\) & \(16.02\) & \(2.54\) & \(1.99\) \\ _kernel_ & \(257,961,616\) & \(2.18\) & \(24.13\) & \(26.90\) & \(21.74\) & \(1.10\) & \(0.82\) \\ _einstein.de.txt_ & \(92,758,441\) & \(0.30\) & \(10.61\) & \(31.04\) & \(4.32\) & \(0.16\) & \(0.11\) \\ _einstein.en.txt_ & \(467,626,544\) & \(0.17\) & \(6.68\) & \(35.00\) & \(5.17\) & \(0.10\) & \(0.07\) \\ _world\_leaders_ & \(46,968,181\) & \(3.40\) & \(12.48\) & \(17.65\) & \(6.94\) & \(1.79\) & \(1.39\) \\ \hline
**General Text** & Size (bytes) & & & & & \\ _ENGLISH_ & \(209,715,200\) & \(40.86\) & \(33.06\) & \(37.64\) & \(28.07\) & \(31.79\) & \(21.12\) \\ _XML_ & \(209,715,200\) & \(23.64\) & \(17.84\) & \(17.12\) & \(11.35\) & \(16.67\) & \(12.07\) \\ \hline \hline \multicolumn{8}{c}{**(a)**} \\ \hline
**Source** & & **online:I** & **LZW** & **gzip -9** & **bzip2 -9** & **Re-Pair** & **LZMA** \\ \hline
**Repetitive Text** & Size (bytes) & & & & & \\ _Escherichia\_Coli_ & \(112,689,515\) & \(0.81\) & \(1.59\) & \(0.0065\) & \(0.062\) & \(26.98\) & \(10.24\) \\ _Para_ & \(429,265,758\) & \(0.26\) & \(1.24\) & \(0.0017\) & \(0.016\) & \(24.43\) & \(10.02\) \\ _Cere_ & \(461,286,644\) & \(0.21\) & \(1.46\) & \(0.0016\) & \(0.015\) & \(25.00\) & \(10.00\) \\ _influenza_ & \(154,808,555\) & \(0.41\) & \(0.72\) & \(0.0047\) & \(0.045\) & \(25.06\) & \(10.16\) \\ _coreutils_ & \(205,281,778\) & \(0.38\) & \(1.23\) & \(0.0036\) & \(0.034\) & \(25.03\) & \(10.22\) \\ _kernel_ & \(257,961,616\) & \(0.23\) & \(1.48\) & \(0.0028\) & \(0.027\) & \(24.39\) & \(9.76\) \\ _einstein.de.txt_ & \(92,758,441\) & \(0.15\) & \(0.61\) & \(0.0079\) & \(0.076\) & \(23.74\) & \(9.54\) \\ _einstein.en.txt_ & \(467,626,544\) & \(0.033\) & \(0.42\) & \(0.0016\) & \(0.017\) & \(22.42\) & \(9.87\) \\ _world\_leaders_ & \(46,968,181\) & \(0.38\) & \(0.96\) & \(0.016\) & \(0.15\) & \(26.79\) & \(9.73\) \\ \hline
**General Text** & Size (bytes) & & & & & \\ _ENGLISH_ & \(209,715,200\) & \(2.17\) & \(1.95\) & \(0.0035\) & \(0.034\) & \(27.00\) & \(10.00\) \\ _XML_ & \(209,715,200\) & \(1.53\) & \(1.05\) & \(0.0035\) & \(0.034\) & \(25.00\) & \(10.00\) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Experimental results for LCA-online _versus_ standard compressors. (**a**) Compression ratio (percentage of the compressed size over the text size); (**b**) Main memory consumption (fraction of the text size); (**c**) Compression time (seconds per 1 MiB). By these results, we can say **LCA-online:(I)** has practical properties for compressing huge highly repetitive texts with economical space, fast compression, and powerful compressive performance.