Comments on: A lean, mean, Wombat http://almaer.com/blog/a-lean-mean-wombat blogging about life, the universe, and everything tech Sat, 08 Sep 2012 07:06:53 -0700 http://wordpress.org/?v=2.8.4 hourly 1 By: replica handbags http://almaer.com/blog/a-lean-mean-wombat/comment-page-1#comment-38966 replica handbags Mon, 30 Jun 2008 06:44:56 +0000 http://almaer.com/blog/a-lean-mean-wombat#comment-38966 thanks thanks

]]> By: Graham Dumpleton http://almaer.com/blog/a-lean-mean-wombat/comment-page-1#comment-37620 Graham Dumpleton Thu, 15 Nov 2007 23:02:23 +0000 http://almaer.com/blog/a-lean-mean-wombat#comment-37620 Whoops, that should have been 'Further there is a lot going on in Apache which isn’t being done in Python code and so the GIL doesn’t even come into the equation.' Whoops, that should have been ‘Further there is a lot going on in Apache which isn’t being done in Python code and so the GIL doesn’t even come into the equation.’

]]> By: Graham Dumpleton http://almaer.com/blog/a-lean-mean-wombat/comment-page-1#comment-37619 Graham Dumpleton Thu, 15 Nov 2007 22:26:04 +0000 http://almaer.com/blog/a-lean-mean-wombat#comment-37619 The GIL being a problem in Python is not the big issue that people make out it is, at least in relation to solutions which embed Python into Apache. This is because Apache is a multi process web server, thus you aren't constrained by your application running in a single process and therefore only one of possibly multiple CPUs and/or cores. Further there is a lot going on in Apache which isn't being done in C code and so the GIL doesn't even come into the equation. For more details see 'http://blog.dscpl.com.au/2007/09/parallel-python-discussion-and-modwsgi.html'. In respect of memory bloat when using mod_python, part of this is because of mod_python importing extra Python modules it doesn't need to, but the main reason behind the high initial memory size is because of poorly installed Python installations. In particular, if your Python installation doesn't include a shared library, with it being linked into the correct location, the mod_python build procedure is forced to use the static Python library and incorporate it into mod_python module itself. Because the code isn't position independent, when loaded address relocations have to be done and instead of the module being shared it turns into process private memory. Thus you loose the benefit of the module being dynamically loaded and shareable. It is a bit disappointing that people continue to propagate these half truths. :-( The GIL being a problem in Python is not the big issue that people make out it is, at least in relation to solutions which embed Python into Apache. This is because Apache is a multi process web server, thus you aren’t constrained by your application running in a single process and therefore only one of possibly multiple CPUs and/or cores. Further there is a lot going on in Apache which isn’t being done in C code and so the GIL doesn’t even come into the equation. For more details see ‘http://blog.dscpl.com.au/2007/09/parallel-python-discussion-and-modwsgi.html’.

In respect of memory bloat when using mod_python, part of this is because of mod_python importing extra Python modules it doesn’t need to, but the main reason behind the high initial memory size is because of poorly installed Python installations. In particular, if your Python installation doesn’t include a shared library, with it being linked into the correct location, the mod_python build procedure is forced to use the static Python library and incorporate it into mod_python module itself. Because the code isn’t position independent, when loaded address relocations have to be done and instead of the module being shared it turns into process private memory. Thus you loose the benefit of the module being dynamically loaded and shareable.

It is a bit disappointing that people continue to propagate these half truths. :-(

]]> By: Brian McCallister http://almaer.com/blog/a-lean-mean-wombat/comment-page-1#comment-37618 Brian McCallister Thu, 15 Nov 2007 20:35:10 +0000 http://almaer.com/blog/a-lean-mean-wombat#comment-37618 Of course! Of course!

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