Department of Computer Science
University of São Paulo
São Paulo, Brazil

Compression and Performance Statistics

On this page you can find some of our compression tests on swapped out pages in Linux 2.4. This page was created to help us out visualize and make some analysis on these data. WARNING: this material is still very raw and some numbers may not be correct due to unpredictable situations. If you have any suggestions or opinion, please send an e-mail to us at linuxcompressed-devel@lists.sourceforge.net.

Configuration

Pentium 120 MHz
32 Mb RAM
64 Mb Swap
Kernels tested:
- 2.4.6 Linux Kernel + 0.18pre1 Compressed Cache
- 2.4.6 Linux Kernel
Compression Algorithm: WKdm

Test Run

Kernel Compilation (2.4.6 vanilla + 2.4.6-4um UML patch)

command:
```
time make linux ARCH=um
```

2.4.6 + 0.18pre1 comp cache 500 pages

real    26m45.172s
user    22m15.550s
sys     1m42.590s

pswpin 7541
pswpout 7803

compressed cache - statistics
-- algorithm --
WKdm
-- compressed pages --
8448
-- compressed pages faulted in --
1215
-- size --
min        | max        | mean     
       272 |       4092 |        2988
-- compression cycles --
min        | max        | mean
     32805 |     358760 |       62247
-- decompression cycles --
min        | max        | mean
      9964 |     332060 |       39033

compression ratio:       72%
discarded pages:       5040
discarded ratio:         59%

2.4.6 vanilla

real    26m34.631s
user    22m13.190s
sys     1m43.330s

pswpin 9306 
pswpout 9288

Page last updated on "Tue Jun 4 06:58:27 2002"
Send feedback to Rodrigo S. de Castro <rcastro@lists.sourceforge.net>