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. AIX
Hi all,
I use AIX operation version 5.3.0.0. and installation Oracle Database 10g.
When swap space use above 80%, server often hang.
my question:
How can i check that which process and path of particular file is using highest Swap space ?
Please help. thanks. (4 Replies)
Discussion started by: hiendv
4 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. UNIX for Dummies Questions & Answers
I need to find what users are currently logged onto the system that is easy just a simple who | awk '{ print $1 }' (thats all I need for the part), but I also need to find how long they have been logged on and the total amount of file space they are using.
Thanks in advance, I have been looking... (3 Replies)
Discussion started by: mauler123
3 Replies
7. 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
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
swap(1M) System Administration Commands swap(1M)
NAME
swap - swap administrative interface
SYNOPSIS
/usr/sbin/swap -a swapname [swaplow] [swaplen]
/usr/sbin/swap -d swapname [swaplow]
/usr/sbin/swap -l
/usr/sbin/swap -s
DESCRIPTION
The swap utility provides a method of adding, deleting, and monitoring the system swap areas used by the memory manager.
OPTIONS
The following options are supported:
-a swapname Add the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for
example, /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the file where the swap area
should begin. swaplen is the desired length of the swap area in 512-byte blocks. The value of swaplen can not be less than
16. For example, if n blocks are specified, then (n-1) blocks would be the actual swap length. swaplen must be at least one
page in length. The size of a page of memory can be determined by using the pagesize command. See pagesize(1). Since the
first page of a swap file is automatically skipped, and a swap file needs to be at least one page in length, the minimum
size should be a multiple of 2 pagesize bytes. The size of a page of memory is machine dependent.
swaplow + swaplen must be less than or equal to the size of the swap file. If swaplen is not specified, an area will be
added starting at swaplow and extending to the end of the designated file. If neither swaplow nor swaplen are specified,
the whole file will be used except for the first page. Swap areas are normally added automatically during system startup by
the /sbin/swapadd script. This script adds all swap areas which have been specified in the /etc/vfstab file; for the syntax
of these specifications, see vfstab(4).
To use an NFS or local file-system swapname, you should first create a file using mkfile(1M). A local file-system swap file
can now be added to the running system by just running the swap -a command. For NFS mounted swap files, the server needs to
export the file. Do this by performing the following steps:
1. Add the following line to /etc/dfs/dfstab:
share -F nfs -o rw=clientname,root=clientname path-to-swap-file
2. Run shareall(1M).
3. Have the client add the following line to /etc/vfstab:
server:path-to-swap-file - local-path-to-swap-filenfs
--- local-path-to-swap-file -- swap ---
4. Have the client run mount:
# mount local-path-to-swap-file
5. The client can then run swap -a to add the swap space:
# swap -a local-path-to-swap-file
-d swapname Delete the specified swap area. This option can only be used by the super-user. swapname is the name of the swap file: for
example, /dev/dsk/c0t0d0s1 or a regular file. swaplow is the offset in 512-byte blocks into the swap area to be deleted. If
swaplow is not specified, the area will be deleted starting at the second page. When the command completes, swap blocks can
no longer be allocated from this area and all swap blocks previously in use in this swap area have been moved to other swap
areas.
-l List the status of all the swap areas. The output has five columns:
path The path name for the swap area.
dev The major/minor device number in decimal if it is a block special device; zeroes otherwise.
swaplo The swaplow value for the area in 512-byte blocks.
blocks The swaplen value for the area in 512-byte blocks.
free The number of 512-byte blocks in this area that are not currently allocated.
The list does not include swap space in the form of physical memory because this space is not associated with a particular
swap area.
If swap -l is run while swapname is in the process of being deleted (by swap -d), the string INDEL will appear in a sixth
column of the swap stats.
-s Print summary information about total swap space usage and availability:
allocated The total amount of swap space in bytes currently allocated for use as backing store.
reserved The total amount of swap space in bytes not currently allocated, but claimed by memory mappings for possi-
ble future use.
used The total amount of swap space in bytes that is either allocated or reserved.
available The total swap space in bytes that is currently available for future reservation and allocation.
These numbers include swap space from all configured swap areas as listed by the -l option, as well swap space in the form
of physical memory.
USAGE
On the 32-bit operating system, only the first 2 Gbytes -1 are used for swap devices greater than or equal to 2 Gbytes in size. On the
64-bit operating system, a block device larger than 2 Gbytes can be fully utilized for swap up to 2**63 -1 bytes.
ENVIRONMENT VARIABLES
See environ(5) for descriptions of the following environment variables that affect the execution of swap: LC_CTYPE and LC_MESSAGE.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
pagesize(1), mkfile(1M), shareall(1M), getpagesize(3C), vfstab(4), attributes(5), largefile(5)
WARNINGS
No check is done to determine if a swap area being added overlaps with an existing file system.
SunOS 5.10 20 Jan 2004 swap(1M)