Re: [9fans] 8 cores

["ron minnich" <rminnich@gmail.com>]

On Thu, Jul 17, 2008 at 6:45 AM, erik quanstrom <quanstro@quanstro.net> wrote:

> i haven't found this to be the case.

it's not always the case.

>
> in a former life, one i'd rather forget, i did
> full text search.
>
> in order to return the full text, we had to go
> get the document.  due to the very crappy
> nature of ext2, it was not feasable to store
> the documents individually.  they had to
> be bundled up in chunks of about 1gb.
>
> being young and easily distracted by shiny
> bits, i decided to use mmap.

A very bad mistake for streaming data.


> as to using mmap for memory management,
> that confuses me.  it's like saying the os should
> provide linked lists, because developers can't do
> it.  isn't part of the argument here that applications
> know better how to manage buffers?
>

In certain cases, the OS memory management for pages can be exploited
and it can do a good job for you. Not in all cases of course.

ron