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

Acknowledgements: special thanks to Livio Baldini Soares for running these tests on his machine.

486 DX 50 MHz
24 Mb RAM
48 Mb Swap
Kernels tested:
- 2.4.6 Linux Kernel + 0.17 Compressed Cache
- 2.4.6 Linux Kernel
Compression Algorithm: WKdm

Test Run

mmap001

1 time

command:
```
time ./mmap001 60
```

2.4.6 + 0.17 comp cache 500 pages

real    0m59.894s
user    0m12.590s
sys     0m13.140s

-- algorithm --
WKdm
-- pages --
895
-- size --
min        | max        | mean
       276 |       3780 |        1546

compression ratio:       37%
discarded pages:         54
discarded ratio:          6%

2.4.6 vanilla

real    0m57.354s
user    0m11.480s
sys     0m13.970s

mmap001

26 times

command:

time for i in `seq 0 25`; do echo $i; ./mmap001 60; done

2.4.6 + 0.17 comp cache 500 pages

real    25m20.588s
user    5m15.060s
sys     5m27.080s

-- algorithm --
WKdm
-- pages --
2264
-- size --
min        | max        | mean
       276 |       3780 |        1288

compression ratio:       31%
discarded pages:         54
discarded ratio:          2%

2.4.6 vanilla

real    25m57.790s
user    4m53.120s
sys     5m27.650s

fillmem001

1 time

command:
```
time ./fillmem 60
```

2.4.6 + 0.17 comp cache 500 pages

real    2m35.466s
user    0m11.380s
sys     0m30.980s

-- algorithm --
WKdm
-- pages --
23761
-- size --
min        | max        | mean
       272 |       3780 |         799

compression ratio:       19%
discarded pages:          4
discarded ratio:          0%

2.4.6 vanilla

real    1m33.770s
user    0m19.250s
sys     0m20.290s

fillmem001

26 times

command:

time for i in `seq 0 25`; do echo $i; ./fillmem 60; done

2.4.6 + 0.17 comp cache 500 pages

real    67m21.808s
user    4m56.990s
sys     12m42.370s

-- algorithm --
WKdm
-- pages --
614010
-- size --
min        | max        | mean
       272 |       3672 |         792

compression ratio:       19%
discarded pages:         26
discarded ratio:          0%

2.4.6 vanilla

real    29m57.146s
user    5m55.220s
sys     7m18.740s

Page last updated on "Tue Jun 4 06:58:10 2002"
Send feedback to Rodrigo S. de Castro <rcastro@lists.sourceforge.net>