1. command to view CPU load
Command 1: uptime
Command 2: cat / proc / loadavg
View CPU information: cat / proc / cpuinfo
load average: indicates that the process of running an average of 1 minute, indicates that the process is running within an average of five minutes, it indicates that the process is running within an average of 15 minutes
2. Check memory
Command 1: free -m
Command 2: cat / proc / meminfo
Men total amount of physical memory memory usage memory is used
Swap Swap
3. Release the memory, release buff / cache value does not affect system operation
echo 3 > /proc/sys/vm/drop_caches
4. Review Process
ps -ef // see the process takes time slice
ps -auxf // view the process with information on CPU, memory load, the process of parent-child relationship
5. The document written directly to physical memory, physical memory occupied
free -m // View free the remaining 1202
mount -t tmfps -o size = 500M tmpfs / mnt // use this command to mount a file of 500M to / mnt
You can view the memory is written 500M
6. The memory mount / mnt, then linked to the database / mnt, can read and write the database upgrade, as mounted on the physical memory, the data can not be guaranteed, a certain physical memory restrictions (in terms of money and plug ) on the slot.