Tag: devshm

About

/dev/shm is nothing but implementation of traditional shared memory concept. It is an efficient means of passing data between programs. One program will create a memory portion, which other processes (if permitted) can access. This will result into speeding up things on Linux.

If you type mount command you will see /dev/shm as a tempfs file system. Therefore, it is a file system, which keeps all files in virtual memory. Everything in tmpfs is temporary in the sense that no files will be created on your hard drive. If you unmount a tmpfs instance, everything stored therein is lost. By default almost all distro configured to use /dev/shm.

 

Revisiting Faster PHP Sessions

"Simplicity is prerequisite for reliability." - Edsger W. Dijkstra. As our experience grows, we learn from past mistakes and discover what's truely important in reliable systems. When designing systems, simplicity is an often heard mantra, but it isn't getting applied nearly as much as spoken off. I'm guilty of this too. I think it's mainly because engineers love to, well, engineer : ) and will naturally try to outsmart problems by throwing more tech at it.

Create turbocharged storage using tmpfs

Everyone knows that RAM is so much faster than a hard disk. To illustrate, while a current SATA disk has peak transfer rates of 375 MB/s, current RAM can do a mind blowing 12,500 MB/s! Normally only the system itself makes use of this ultra fast storage, but we can also access this space directly. And that opens a great window of opportunity.