September 2016
Intermediate to advanced
989 pages
24h 10m
English
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Swap
The idea of swapping is to reserve some storage where the kernel can place pages of memory that are not mapped to a file, so that it can free up the memory for other uses. It increases the effective size of physical memory by the size of the swap file. It is not a panacea: there is a cost to copying pages to and from a swap file which becomes apparent on a system that has too little real memory for the workload it is carrying and begins disk thrashing.
Swap is seldom used on embedded devices because it does not work well with flash storage where constant writing would wear it out quickly. However, you may want to consider swapping to compressed RAM (zram).
Swap to compressed memory (zram)
The zram driver creates RAM-based block devices named ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.