Re: [Boost-users] [interprocess] Reading huge files

Subject: Re: [Boost-users] [interprocess] Reading huge files
From: Oodini (svdbg____at_[hidden])
Date: 2013-10-16 05:11:38

> I need to read huge amounts of data (for instance, a 20GB file), and
> since memory mapping is quite fast, I was going to use it.

Illusion.

The first time you'll use your data elements, you'll face a "soft" page defaults.
If your code has an initialization process to map the shared memory, I advise you to read some elements of the data (use a lopp to read one element on ? elements).
So when you'll use your data when you'll really need it, it will be faster.