07-12-2010
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
How do i check/get the total amount of RAM, on a machine running UNIX? (4 Replies)
Discussion started by: samudimu
4 Replies
2. Solaris
Hi All,
I am trying to find the physical memory usage by each process/users.
Can you please let me know how to get the memory usage?.
Thanks,
bsraj. (12 Replies)
Discussion started by: bsrajirs
12 Replies
3. UNIX for Dummies Questions & Answers
I'm writing a shell script to display as much useful information on physical and virtual memory availability and usage as possible. I need a CLI tool to print these numbers for me.
The utilities that I know to give out some statistics are the following:
free
top
vmstat
sysctl
In Linux... (1 Reply)
Discussion started by: fiori_musicali
1 Replies
4. 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
5. Filesystems, Disks and Memory
A bit of background
I'm running a Nexenta (OpenSolaris kernel + a number of Debian tools) server running a ZRAID of 3x 1TB SATA2 drives (essentially a RAID5 formatted in ZFS, for those who aren't familiar with zpools).
When running the ZFS scrub command (ZFS's equivelent of fsck) I get a number... (0 Replies)
Discussion started by: laumars
0 Replies
6. Shell Programming and Scripting
Hi,
I am trying to get the system RAM size from "top" command's output by the following but it is not working.
top | sed "s/^Mem.**\(*\), *//" (10 Replies)
Discussion started by: royalibrahim
10 Replies
7. Solaris
Hi All,
Ram memory always fails,i did not find the reason...........any one can help i this.:wall: (2 Replies)
Discussion started by: Rajesh_Apple
2 Replies
8. Ubuntu
How do I find if I have defective ram in my computer.
I don't have a cd-rom, so I can't use a bootable cd. (1 Reply)
Discussion started by: locoroco
1 Replies
9. Red Hat
Hi Experts,
I have a linux system , which triggers a alarm if RAM memory goes above 70%... When i see top command i cant find any process utilizing much of memory .. Can anyone tell me what could be the reason for high memory utilization.. Bellow is the free command o/p:
free ... (14 Replies)
Discussion started by: shaliniyadav
14 Replies
10. Filesystems, Disks and Memory
Hi,
i have just installed 4 gb RAM ddr3 on OS Windows 7 32 bit.
In "manage peripherals" i see this section:
Memory installed (ram) : 4,00 gb (2,30gb usable)
Why only 2,30 gb usable ?
In Windows 7 32bit the maximum size is not 3,00gb ?
see file attached, please (4 Replies)
Discussion started by: nash83
4 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)