> Ah! No Linux experience explains where your perspective is 
> coming from. Unlike proprietary systems like Windows and 
> Solaris, there is basically nothing you can't change on a 
> Linux system. You can literally, rewrite whole sections of 
> the kernel to tune your system if you like. 

No, YOU can rewrite whole sections of the kernel. I know my limitations.

> In fact, the case study that Allaire did on my Linux CF 4.5.1 
> installation at TeamToolz showed some pretty high numbers for 
> the time. These numbers were obtained by tuning the hell out 
> of the machines including changing the source code to parts 
> of the kernel.
> 
> I did talk with Jessie Knoller about writing a Linux performance 
> tuning white paper. I even sent him a draft of it. However, I 
> never saw anything come of it. I white paper is really needed 
> for Linux and I would be happy to work with anyone who would 
> like to have one written. Providing the data as a list here 
> most likely won't work as there is an enormous amount of 
> variables for tuning Linux. For example, I could give a list 
> of file system variables that are tunable, but that list would
> depend on which file system you use.

Well, that certainly sounds sensible. I can see why it hasn't been pursued,
though, since it sounds like a lot of work.

However, it raises some additional questions. Would much of that tuning be
CF-specific? That is, let's say I've got a CGI application - better yet, two
applications. Let's say I write two copies of the same application, with the
same functionality, in two languages: CF and Perl. How many of the above
(OS, network stack, web server) variables would have significant differences
between a CF 5 installation and Apache/mod_perl? This is a serious question
- most OS tuning on other platforms doesn't really get more specific than
"I'm going to use this machine to run CGI database applications, so I set
this and that and the other thing."

Second, other than experience, how would you figure out which variables
interact with other variables? I mean, you might know everything there is to
know about the OS, but you probably don't know everything there is to know
about the internals of CF, since it's a closed system, essentially.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/
voice: (202) 797-5496
fax: (202) 797-5444

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