02-14-2008
Thanks for the reply.One thing i am wondering.Sometime back the server was having 4GB ram and recently upgraded to 8 GB.Before upgrading from 4 to 8 GB RAM it was showing 99% memory usage & after upgradation also the same case..
Can anybody throw light on this. ?
10 More Discussions You Might Find Interesting
1. UNIX for Advanced & Expert Users
Hi All,
I have a question, can you guys please help me by giving your valuable suggestons:
I am using AIX 5L, running oracle 7 version. I need to increase the oracle memory to 40 MB more. Currently Oracle occupies 260M. I wanted to know whether I can increase the memory without any problem.... (1 Reply)
Discussion started by: kollam68
1 Replies
2. AIX
Hi All,
I have a question, can you guys please help me by giving your valuable suggestons:
I am using AIX 5L, running oracle 7 version. I need to increase the oracle memory to 40 MB more. Currently Oracle occupies 260M. I wanted to know whether I can increase the memory without any problem.... (3 Replies)
Discussion started by: kollam68
3 Replies
3. AIX
How to check the memory usage on AIX by various processes? (1 Reply)
Discussion started by: aajmani
1 Replies
4. AIX
How to monitor the IBM AIX server for I/O usage, memory usage, CPU usage, network usage, storage usage? (3 Replies)
Discussion started by: laknar
3 Replies
5. UNIX for Advanced & Expert Users
Hello all,
I am facing a memory related issue on my linux that is CentOS 4.0. What I see as an output of top command, free command is that memory usage is almost 90% which is quite high without much load on the system. This is continuously showing 90% or so of memory usage with top or free... (2 Replies)
Discussion started by: radiatejava
2 Replies
6. AIX
hi,
I want to ask , my AIX 6.1 is always used about 97% memory.
Is this normal ?
or any command can free up memory like Linux ?
thanks. (1 Reply)
Discussion started by: virusxx
1 Replies
7. Shell Programming and Scripting
can any one please help me to shell script
high memory usage alert (6 Replies)
Discussion started by: robo
6 Replies
8. AIX
I am new to AIX, I have few AIX 5.3 servers and I could see there are significant difference in paging space utilization on servers even though they are running same applications
below server is working fine which shows 2-5 % paging usage throuh out the day
cpu_scale_memp = 8... (12 Replies)
Discussion started by: bibish
12 Replies
9. Red Hat
Hi ,
There is one following alert .
Message : cdm:Average (2 samples) swap memory usage is now 91%, which is above the warning threshold (90%)
Here is my findings.
Output of TOP command in Linux server.
top - 14:21:44 up 6 days, 4:48, 1 user, load average: 2.55, 2.06,... (3 Replies)
Discussion started by: Maddy123
3 Replies
10. UNIX for Advanced & Expert Users
Hi,
This morning there was an app that caused a sudden spike in I/O and memory usage in the server. We found the reason for the I/O, however the memory spike was something new, as it had never happened before.
I figured out what caused the memory spike, however, how do I investigate why... (6 Replies)
Discussion started by: anaigini45
6 Replies
RAM(4) Kernel Interfaces Manual RAM(4)
NAME
ram - ram disk driver
SYNOPSIS
/sys/conf/SYSTEM:
NRAM ram_size # RAM disk size (512-byte blocks)
major device number(s):
block: 3
minor device encoding:
must be zero (0)
DESCRIPTION
The ram pseudo-device provides a very fast extended memory store. It's use is intended for file systems like /tmp and applications which
need to access a reasonably large amount of data quickly.
The amount of memory dedicated to the ram device is controlled by the NRAM definition in units of 512-byte blocks. This is also patchable
in the system binary through the variable ram_size (though a patched system would have to be rebooted before any change took effect; see
adb(1)). This makes it easy to test the effects of different ram disk sizes on system performance. It's important to note that any space
given to the ram device is permanently allocated at system boot time. Dedicating too much memory can adversely affect system performance
by forcing the system to swap heavily as in a memory poor environment.
The block file accesses the ram disk via the system's buffering mechanism through a buffer sharing arrangement with the buffer cache. It
may be read and written without regard to physical disk records. There is no `raw' interface since no speed advantage is gained by such an
interface with the ram disk.
DISK SUPPORT
The ram driver does not support pseudo-disks (partitions). The special files refer to the entire `drive' as a single sequentially
addressed file.
A typical use for the ram disk would be to mount /tmp on it. Note that if this arrangement is recorded in /etc/fstab then /etc/rc will
have to be modified slightly to do a mkfs(8) on the ram disk before the standard file system checks are done.
FILES
/dev/ram block file
/dev/MAKEDEV script to create special files
/dev/MAKEDEV.local script to localize special files
SEE ALSO
hk(4), ra(4), rl(4), rk(4), rp(4), rx(4), si(4), xp(4) dtab(5), autoconfig(8)
DIAGNOSTICS
ram: no space. There is not enough memory to allocate the space needed by the ram disk. The ram disk is disabled. Any attempts to access
it will return an error.
ram: not allocated. No memory was allocated to the ram disk and an attempt was made to open it. Either not enough memory was available at
boot time or the kernel variable ram_size was set to zero.
BUGS
The ram driver is only available under 2.11BSD.
3rd Berkeley Distribution Januray 27, 1996 RAM(4)