Exact RAM size.

[Rohit khaladkar]

Thanks a lot! That helps!
Rohit Khaladkar

On Fri, Nov 14, 2008 at 4:10 PM, David Tonhofer <redhatter at m-plify.net>wrote:

> Rohit khaladkar wrote:
>
>> Hi!I have Red Hat linux 4.5 and 5.2 installed on my systems. There is a
>> application which tells me, how much exact RAM size is required to load
>> another application.For eg : it would be 20 GB or 2 GB.
>> Now when I run my script I need to find out the RAM size.But if the server
>> ordered is of 2GB RAM size , exactly 2GB is never shown by the system. It
>> is
>> a little less than 2GB.Is there any way I can have a criteria
>> to tell how much is the exact RAM size.
>>
>> Thanks!
>> Rohit Khaladkar
>>
>>
> Well, what the operating system tells you counts.
>
> For example, if you have 4 GiB installed (as given by the DIMM sizes), then
> the OS
> will announce less:
>
> -- because the hardware will not see part of the RAM as it will be hidden
> by memory-mapped devices
> -- because the kernel reserves a part for the crash handler
> -- because of the kernel image
>
> So you just do "cat /proc/meminfo" (or alternatively 'free', which reads
> /proc/meminfo) and read off "MemTotal".
> This is all the free memory you get.
>
> Kernel data structures, I/O caches and the User processes will all have to
> go in there.
>
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