01-19-2007
reduce available ram
hello, we have a aix 5.2 server with 8GB of ram. is it possible, without actually removing the hardware, to have the O/S think it has only 4GB of ram? We would like to see how the handles and responds if it only had 4Gb instead of the 8GB. Any ideas or suggestions? Thanks
Looks like i found where this can be accomplished via smit by changing the 'amount of usable physical memory'. Does anyone have experience reducing this setting? Does it require reboot, etc? Thanks again
Last edited by zuessh; 01-19-2007 at 03:00 PM..
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi ,
how can i reduce the or conditions:
if ]; then
whatever
fi (8 Replies)
Discussion started by: hitmansilentass
8 Replies
2. UNIX for Dummies Questions & Answers
Hi,
I have a server which is running out of space on the rootvg. When trying to find some spare space I discovered there are 2 sysdump logical volumes, each of 5GB, yet if I get an estimate of the dump size it's only 0.5 GB.
$ lsvg -l rootvg|grep sysdump
hd71 sysdump 20 ... (1 Reply)
Discussion started by: m223464
1 Replies
3. Shell Programming and Scripting
Hi All,
The below script I run daily and it consumes 2 hours approx.
In this I am calling another script and executing the same twice.
Is the loop below the cause for the slow process?Is it possible to finetune the program so that it runs in a much faster way?
The first script:
#!/bin/ksh... (4 Replies)
Discussion started by: Sreejith_VK
4 Replies
4. Shell Programming and Scripting
hi
i have a string "hostname=lpdma520_dev_ipc_us_aexp_com"
now i need only "newHostname=lpdma520"
how to do this one
please help soon (2 Replies)
Discussion started by: satish@123
2 Replies
5. Shell Programming and Scripting
printf "\nClosing stats:\n" >> data.txt
echo >> data.txt
sed 's/^ \t*//;/^#/d;/^$/d' $stats | while read line
do
close=$(grep -w "^$line" $datafile | sed -e 's/\(.*\),\(.*\),\(.*\)/\2/')
if ; then
printf "%5d. %-s was not found in file\n"... (3 Replies)
Discussion started by: jafa401
3 Replies
6. Red Hat
Hi,
On server 64bit Hw Arch , Linux 5.0(32bit) is installed it is showing only 3gb of ram though physical is 16gb
can u give me idea why? (4 Replies)
Discussion started by: manoj.solaris
4 Replies
7. Shell Programming and Scripting
i want to reduce a length in the file called text
in the file im having 10 byte length.
want to reduce it to 9 byte length for all lines. (5 Replies)
Discussion started by: laknar
5 Replies
8. Shell Programming and Scripting
Hi All,
Could some one help me to reduce the code...
if
then
./plist -m "$queuename" |grep $2|awk '{print $3}' >unlock.log
elif
then
./plist -m "$queuename" |grep $2|awk '{print $4}' >unlock.log
else
./plist -m "$queuename" |grep $2|awk '{print $5}' >unlock.log
.
.
.
.
... (1 Reply)
Discussion started by: harshakusam
1 Replies
9. UNIX for Dummies Questions & Answers
recod,amount,noofaccount,count
98,+00000187865779787,00319,000000640/
99,+00000187865779787,00001,000000642/
thsi is my input file my question is
1) Reduce the count on the 98 record by 2 (6 Replies)
Discussion started by: sgoud
6 Replies
10. Shell Programming and Scripting
hi all,
i have written the following script that does this work:
1. copy large logs files from one server to another.
2. then unzip this files and extraxt from these large https logs only those fields that are neccesary.
3. then archive the extracted logs to new files.
BUT the problem is... (7 Replies)
Discussion started by: arrals_vl
7 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)