[lc-devel] [STATS] 0.23pre8: Kernel Compilation + MUMmer

[Rodrigo S. de C. <rc...@im...>]

I performed some tests with the Linux Kernel compilation (2.4.18) and
an scientific named MUMmer to check the performance of our latest
version, 0.23pre8. The latter test is very interesting because it has
a very intensive use of CPU and memory to do its computations.

Both set of tests were run with the aid of an script which automates
the process. Every run is preceded by a cold reboot. This script links
itself to the rcS.d directory in order to be performed before main
services come up in the boot process.

The compressed cache configuration used for each test:

- Compressed Cache version 0.23pre8
- Support for Page Cache compression
- Resize Compressed Cache on Demand
- WKdm compression algorithm

Linux Kernel Compilation
------------------------
http://linuxcompressed.sourceforge.net/statistics/0.23pre8_kernel/

Very nice results for -j2 and -j4 concurrency levels, but not yet good
results for -j1 test. Anyway, for the first time there is a gain for
this case (j1), even if tiny, as you will be able to check in the
complete data available on the page.

For the higher concurrency leves (-j2 and -j4), the compressed cache
completion time for the compilation is up to 36% smaller than
vanilla's time.

MUMmer
------
http://linuxcompressed.sourceforge.net/statistics/0.23pre8_mummer/

This program runs very well on a system with compressed cache, running
up to 45% faster than on a system with vanilla kernel. There are gains
only for small caches, since larger compressed cache end up having so
many page faults between uncompressed and compressed caches that make
it unusable.

-- 
Rodrigo S. de Castro <rc...@im...>