Script to calculate installed memory.

pobrika · 04-04-2011, 05:23 AM

Hello,

I am trying to write a script to calculate the total amount of installed memory to use during an anaconda kickscript, so the swap file is created at 2 x the installed memory.

I so far have the amount of installed RAM DIMMS but need a way to total them up and produce a varible I can use in the pre section of the install.

Code:

dmidecode -t 17 | grep Size | awk ' { print $2 }'
Output:
2048
2048

Note: on some servers there could be from 1 DIMM up to 16 DIMMS installed so the script needs to be able to handle this. I also can not use bc as it does not exist during the install stage.

I am guessing I need a while loop to do this and use expr but do not know where to start for this logic.

Cheers

Guttorm · 04-04-2011, 06:02 AM

Hi

Why not read /proc/meminfo?

Code:

grep MemTotal /proc/meminfo

pobrika · 04-04-2011, 06:32 AM

Quote:

Originally Posted by Guttorm

Hi

Why not read /proc/meminfo?

Code:

grep MemTotal /proc/meminfo

Unfortunately during the boot stage the kernel can only address maximum of 4GB so dmidecode is the only way to tell how much is really in the server.

Guttorm · 04-04-2011, 06:59 AM

Hmm. If you just want the sum, awk can calculate it.

Code:

dmidecode -t 17 | grep Size | awk '{ SUM += $2} END { print SUM }'