10 More Discussions You Might Find Interesting
1. Red Hat
CENT OS 5.8 server running with a huge java application which uses up all my ram (4GB) and requires excess of atleast 2GB.But the swap is not getting used up((8GB) of swap space left unused) leading a wierd error and stopping application to stop working.
Any one here dealt with the same kind of... (2 Replies)
Discussion started by: shiek.kaleem
2 Replies
2. Solaris
Dear All,
I have a swap space of 16G available in Sol 10. I have allocated it as a seperate file system. But when the RAM Is full used , the system gets rebooted and the swap is not being used,.
Any reasons for this.
Rgds
Rj (5 Replies)
Discussion started by: jegaraman
5 Replies
3. Linux
Hi,
i have done a blunder here, i increased the swap space on Xen5.6 server machine using below steps :-
1056 dd if=/dev/zero of=/root/myswapfile bs=1M count=1024
1057 ls -l /root/myswapfile
1058 chmod 600 /root/myswapfile
1059 mkswap /root/myswapfile
1060 swapon /root/myswapfile
... (1 Reply)
Discussion started by: apm
1 Replies
4. Solaris
We have a SPARC system which is running on Solaris-9 and Physical memory size is 16GB.We have allocated 32GB SWAP space(2 times of physical memory).But when we use df -h command it shows following output and SWAP space size shows more than our allocated space
# df -h
Filesystem size used... (2 Replies)
Discussion started by: cyberdemon
2 Replies
5. Solaris
Could someone please explain how you know how much swap space you have on your system. See below:
# swap -s
total: 8225048k bytes allocated + 4863488k reserved = 13088536k used, 4008032k available
# swap -l
swapfile dev swaplo blocks free
/dev/dsk/c3t0d0s1 32,25 16... (2 Replies)
Discussion started by: jamba1
2 Replies
6. Linux
Hi,
I want to know how can i free the swap space if it is completely full,
0 mb remaining, (1 Reply)
Discussion started by: manoj.solaris
1 Replies
7. UNIX for Dummies Questions & Answers
Plz I need to know how much swap mem free and used i have.
I'm using Compaq Tru64 UNIX V5.1A (rev 1885)
Thanx (1 Reply)
Discussion started by: Lestat
1 Replies
8. AIX
how do you get the paging space reduced without rebooting the machine ? the os is aix (2 Replies)
Discussion started by: aaronh
2 Replies
9. UNIX for Dummies Questions & Answers
Hello,
I would like to know if there is any difference between the pageing space and the swap space.
Thank you in advance. (1 Reply)
Discussion started by: VeroL
1 Replies
10. UNIX for Dummies Questions & Answers
All,
I am using SOLARIS 7. I have formated my hard drive to consist of only 150MB of swap space. This isn't enough considering I am running Oracle. How do I create additional swap space?
Please list sources or commands.
PS mkswap doesn't work on my machine. ( I have swap and... (5 Replies)
Discussion started by: SmartJuniorUnix
5 Replies
mem(7D) Devices mem(7D)
NAME
mem, kmem, allkmem - physical or virtual memory access
SYNOPSIS
/dev/mem
/dev/kmem
/dev/allkmem
DESCRIPTION
The file /dev/mem is a special file that provides access to the physical memory of the computer.
The file /dev/kmem is a special file that provides access to the virtual address space of the operating system kernel, excluding memory
that is associated with an I/O device.
The file /dev/allkmem is a special file that provides access to the virtual address space of the operating system kernel, including memory
that is associated with an I/O device. You can use any of these devices to examine and modify the system.
Byte addresses in /dev/mem are interpreted as physical memory addresses. Byte addresses in /dev/kmem and /dev/allkmem are interpreted as
kernel virtual memory addresses. A reference to a non-existent location returns an error. See ERRORS for more information.
The file /dev/mem accesses physical memory; the size of the file is equal to the amount of physical memory in the computer. This size may
be larger than 4GB on a system running the 32-bit operating environment. In this case, you can access memory beyond 4GB using a series of
read(2) and write(2) calls, a pread64() or pwrite64() call, or a combination of llseek(2) and read(2) or write(2).
ERRORS
EFAULT Occurs when trying to write(2) a read-only location (allkmem), read(2) a write-only location (allkmem), or read(2) or write(2) a
non-existent or unimplemented location (mem, kmem, allkmem).
EIO Occurs when trying to read(2) or write(2) a memory location that is associated with an I/O device using the /dev/kmem special
file.
ENXIO Results from attempting to mmap(2) a non-existent physical (mem) or virtual (kmem, allkmem) memory address.
FILES
/dev/mem Provides access to the computer's physical memory.
/dev/kmem Provides access to the virtual address space of the operating system kernel, excluding memory that is associated with an
I/O device.
/dev/allkmem Provides access to the virtual address space of the operating system kernel, including memory that is associated with an
I/O device.
SEE ALSO
llseek(2), mmap(2), read(2), write(2)
WARNINGS
Using these devices to modify (that is, write to) the address space of a live running operating system or to modify the state of a
hardware device is extremely dangerous and may result in a system panic if kernel data structures are damaged or if device state is
changed.
SunOS 5.11 18 Feb 2002 mem(7D)
