Re: Parallel Compression 1.0 ...


Alex Fraser wrote:
L2 cache between the Q6600 (8MB) and Q9550 (12MB).

Of course, it's not the same cache size.

And as you have noticed - look again http://compression.ca/pbzip2 -
it's not 3x for 3 nor 4x for 4 ...

Also - look inside the zip- i am using ParallelStructuredStorage.pas -
- a portable compound file system -


http://pages.videotron.com/aminer/


Sincerely,
Amine Moulay Ramdane.



Alex Fraser wrote:

How does this compare in terms of speed-up withhttp://compression.ca/pbzip2/?

The closest processor benchmarked there, a Core2 Q9550, shows almost
linear speed-up from one to four threads. However, from your benchmarks
(2.7x for 3 threads and 3.3x for 4) and what I know of bzip2 this could
well be due to the difference in L2 cache between the Q6600 (8MB) and
Q9550 (12MB).

Alex


On Apr 1, 7:55 am, Alex Fraser <m...@xxxxxxxxxxx> wrote:
On 01/04/2010 00:21, aminer wrote:

Parallel Compression 1.0

Author: Amine Moulay Ramdane

Description:

Parallel Zlib and Parallel Bzip algorithms that use my Thread Pool
Engine.

Please look at pzlib.pas and pbzip.pas inside the zip file - compile
and execute them...

And please see the benchmarks here:

http://pages.videotron.com/aminer/ParallelCompression/parallelbzip.htm

How does this compare in terms of speed-up withhttp://compression.ca/pbzip2/?

The closest processor benchmarked there, a Core2 Q9550, shows almost
linear speed-up from one to four threads. However, from your benchmarks
(2.7x for 3 threads and 3.3x for 4) and what I know of bzip2 this could
well be due to the difference in L2 cache between the Q6600 (8MB) and
Q9550 (12MB).

Alex

.