Linux How To Create A RamDisk
size = the amount of RAM (m for megabytes)
/mnt/ram = the mount location of the ram disk (change to the path you want it mounted to)
mount -t tmpfs -o size=4096m tmpfs /mnt/ram/
Example test in an old server:
You can see that when reading if you don't specify bs1=M the read speeds are several times slower (eg. 450MB/s vs 2.1GB/s)
mount -t tmpfs -o size=4096m tmpfs /mnt/ram/^C
root@testserver:~# dd........
lvm resize and use the remaining extra space
df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/vg_12-lv_root
50G 1.2G 46G 3% /
tmpfs 7.8G 0&nb........
Apache High CPU Usage Enable Mod_Status Guide Solution - Find Cause of High CPU Usage Script/Domain
mod_status is a great way to track down the source of high CPU usage and to find what vhost/script is the cause of it.
It gives you a live view of bandwith usage, CPU usage, and memory usage broken down by domain/vhost and script/URI.
Enable mod_status
vi /etc/httpd/conf/httpd.conf
ExtendedStatus On
SetHandler server-status
Order Deny,Allow
Deny from all
All........