Comments on: Pooled Allocators For The STL http://www.sjbrown.co.uk/2004/05/01/pooled-allocators-for-the-stl/ It works on my machine. Fri, 27 Aug 2010 08:48:11 +0000 hourly 1 http://wordpress.org/?v=3.0.1 By: Tombox http://www.sjbrown.co.uk/2004/05/01/pooled-allocators-for-the-stl/comment-page-1/#comment-647 Tombox Sun, 08 Feb 2009 13:21:14 +0000 http://sjbrown.co.uk/blog/?p=85#comment-647 Hi, how do you choose the granularity factor when creating a pool (for example, 32 above)? Is it the supposed node size of the container? So, for example, should I choose 20 for PooledSet (3 pointers + 1 int + 1 bool + padding) Tx Hi,
how do you choose the granularity factor when creating a pool (for example, 32 above)? Is it the supposed node size of the container? So, for example, should I choose 20 for PooledSet (3 pointers + 1 int + 1 bool + padding)
Tx

]]> By: Ippokratis http://www.sjbrown.co.uk/2004/05/01/pooled-allocators-for-the-stl/comment-page-1/#comment-356 Ippokratis Fri, 28 Nov 2008 19:04:29 +0000 http://sjbrown.co.uk/blog/?p=85#comment-356 Hey Simon, Thanks a bunch for this article. I am developing a multithreaded application on a Sun Niagara II box (64 OS "visible" cpus) and I was getting extremely bad performance with the default std::allocator. (note: your test code will assert on a 64-bit machine). I have adapted your test to compare the performance on a multi-threaded environment. Below are the results: $ uname -a SunOS local 5.10 Generic_127111-09 sun4v sparc SUNW,SPARC-Enterprise-T5220 $ CC -V CC: Sun C++ 5.9 SunOS_sparc 2007/05/03 $ ./simple 192:main: 1 threads 201:main: Avg. Factor: 1.07 192:main: 2 threads 201:main: Avg. Factor: 1.03 192:main: 4 threads 201:main: Avg. Factor: 0.92 192:main: 8 threads 201:main: Avg. Factor: 0.48 192:main: 16 threads 201:main: Avg. Factor: 0.17 192:main: 32 threads 201:main: Avg. Factor: 0.23 Contact me if you want the updated code. Cheers, -Ipporatis. Hey Simon,

Thanks a bunch for this article. I am developing a multithreaded application on a Sun Niagara II box (64 OS “visible” cpus) and I was getting extremely bad performance with the default std::allocator.
(note: your test code will assert on a 64-bit machine).

I have adapted your test to compare the performance on a multi-threaded environment.
Below are the results:

$ uname -a
SunOS local 5.10 Generic_127111-09 sun4v sparc SUNW,SPARC-Enterprise-T5220
$ CC -V
CC: Sun C++ 5.9 SunOS_sparc 2007/05/03
$ ./simple

192:main: 1 threads
201:main: Avg. Factor: 1.07
192:main: 2 threads
201:main: Avg. Factor: 1.03
192:main: 4 threads
201:main: Avg. Factor: 0.92
192:main: 8 threads
201:main: Avg. Factor: 0.48
192:main: 16 threads
201:main: Avg. Factor: 0.17
192:main: 32 threads
201:main: Avg. Factor: 0.23

Contact me if you want the updated code.

Cheers,
-Ipporatis.

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