Question: My build is slow because of disk I/O. How do I use RAM as a filesystem?
Try:sudo mount -t tmpfs -o size=4G,mode=1777 tmpfs /mnt/ramdisk
Info:tmpfs creates an ultra-fast temporary RAM filesystem (~7x faster than SSD), ideal for build caches, temp files, and test databases. Data vanishes on reboot.
Examples:
$ sudo mkdir /mnt/ramdisk && sudo mount -t tmpfs -o size=2G tmpfs /mnt/ramdisk # Create & mount 2G RAM disk
$ echo 'tmpfs /mnt/ramdisk tmpfs defaults,size=4G 0 0' | sudo tee -a /etc/fstab # Persist mount config across reboots
Note:mode=1777 sets world-writable access with the sticky bit (like /tmp). RAM is only consumed as files are written and freed when deleted or unmounted.
LinuxTeck.com
linuxteck:~$ sudo mount -t tmpfs -o size=4G,mode=1777 tmpfs /mnt/ramdisk
linuxteck:~$ df -h /mnt/ramdisk
Filesystem Size Used Avail Use% Mounted on
tmpfs 4.0G 0 4.0G 0% /mnt/ramdisk
linuxteck:~$ dd if=/dev/zero of=/mnt/ramdisk/test bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 0.345 s, 3.1 GB/s
linuxteck:~$ dd if=/dev/zero of=/tmp/test bs=1M count=1024
1024+0 records in
1024+0 records out
1073741824 bytes (1.1 GB, 1.0 GiB) copied, 2.34 s, 459 MB/s
linuxteck:~$
John Britto Founder & Chief-Editor @LinuxTeck. A Computer Geek and Linux Intellectual having more than 20+ years of experience in Linux and Open Source technologies.
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