--- In [email protected], "gurumeda_msselva" <gurumeda_msse...@...> wrote: > > what is /dev/shm & why it is required in linux >
/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. You can use /dev/shm to improve the performance of application software or overall Linux system performance. On heavily loaded system, it can make tons of difference. For example VMware workstation/server can be optimized to improve your Linux host's performance (i.e. improve the performance of your virtual machines). For example, if you have 8GB RAM then remount /dev/shm as follows: # mount -o remount,size=8G /dev/shm To be frank if you have more than 2GB RAM and if you running multiple Virtual machines this hack always improves performance. B.Sadhiq
