Engineers at Meta, Facebook’s parent company, have revealed how they have been able to offer free memory using a software solution called Transparent Memory Offloading (TMO).

It is now part of the Linux kernel and, in a nutshell, automatically offloads data to other storage tiers (e.g. Samsung’s CX memory expander) that are less costly and more power efficient than memory.

The savings are significant; TMO has been running on millions of Facebook servers for more than a year, saving up to almost a third of memory per server. While that is likely to be insignificant across dozens or even hundreds of servers, Facebook’s immense scale presents a unique challenge. 

Analysis: Facebook’s gargantuan appetite for RAM

The world’s largest social network has nearly three billion monthly active users and millions of servers spread around 21 locations worldwide. Should each server carry  128GB of RAM on average, that would amount to 256 million GB (or 256PB) of RAM which, at an average cost of $4 per GB (DDR4 ECC RAM), is about $1 billion worth of memory. That’s on the assumption that Facebook has at least two million servers (Facebook’s blog quoted “millions of servers” as early as July 2018), with …read more

Source:: TechRadar – All the latest technology news


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