topic Re: Memory Missing in Operating System - Linux

Memory Missing

Marty Metras — Tue, 24 Jul 2001 13:03:23 GMT

On a HP 9000 using HP-UX 10.20 How do you tell how much memory is on the system?
I think we lost 1/2 of the memory.
Using "top" the free memory is very low.
If I remember right real Memory is the total that should be on the box?
It shows "Memory: 461996K (191360K) real, 518416K (234212K) virtual, 75288K free"
This means it thinks there is only 500MB. This box should have 1000MB.
Am I looking at this right?
Marty

Re: Memory Missing

Paul R. Dittrich — Tue, 24 Jul 2001 17:26:00 GMT

I don't believe any memory is missing.

I think the buffer cache (BCACHE) by default uses (the lower) half of physical RAM for its work. The kernel loads from the top of RAM space down, and the remainder between the kernel and BCACHE is the user space.

HTH,
Paul

Re: Memory Missing

Philip P. Hartl — Tue, 24 Jul 2001 18:08:00 GMT

Try running mstm. Scroll down to the memory line. It will show the memory found during the last information run. Highlight this line by pressing enter. Tab to the menu, select Tools -> Information -> Run. This will show you by memory board and summary how much memory is found.

Re: Memory Missing

Marty Metras — Tue, 24 Jul 2001 19:57:46 GMT

Thanks Paul,
After you responce I checked this out and I now understand.
Marty

Re: Memory Missing

Magdi KAMAL — Fri, 27 Jul 2001 12:47:16 GMT

Hi Marty,

If you ant to know the amount of physical memory on your system, just type the following command :

dmesg
The last line give you :

Physical : nnnnnn

nnnnnn : Express the amount of physical memory in KBytes.

Magdi

Re: Memory Missing

Nico van Royen — Wed, 01 Aug 2001 10:00:08 GMT

It might be possible that some of the memory has been disabled. Blocks of memory that are considered 'dead' are called tombstones by HPUX and logging of those (memory and cpu's) are stored in /var/tombstones/. The file you should check is the ts99 file (or have it debugged by your HP engineer).

Nico van Royen