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memory taken by ramdisk not included in the output of top command

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linux-howto

https://www.centos.org – Strictly speaking tmpfs is not a RAM disk, it's a virtual storage backed file system that uses RAM and swap as its backing store. It's allocated on demand so the space would only be used ... [by TrevorH] (HowTos)

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Submitted by nicelinux on 01/07/2013 – Made popular on 01/07/2013

Stories similar to memory taken by ramdisk not included in the output of top command

On Solaris, the /tmp filesystem is a filesystem of type "tmpfs". It's implemented in the kernel by allocated space from the virtual memory pool.

tmpfs questions 10 weeks 6 days ago

I'm going to be putting Fedora 18 on a desktop w/ 32GB of memory.

One of many things it will be used for is building packages.

What I'm kind of thinking of doing is setting up a tmpfs filesystem with 10GB of capacity for mock so that very little disk IO is needed for building packages.

My understanding is that the way tmpfs works is different than a traditional ram disk.

swap puzzle 1 year 8 weeks ago

I'm getting confused by swap

# swap -l swapfile dev swaplo blocks free /dev/zvol/dsk/rpool/swap 256,2 16 16777200 16777200 /dev/zvol/dsk/swappool/swap2 256,1 16 50331632 50331632

# swap -s total: 6710256k bytes allocated + 3402944k reserved = 10113200k used, 25553936k available

From the -l command, I see swap space is totally free, not allocated.

Determing size of swap space 37 weeks 5 days ago

Hi Experts,

Need your advise in determining the size of swap space in of the new HP-Ux server.

Server is having 32G of physical memory.

Ideally what amout of physical memory should be allocated as a swap space?

Following document from HP suggests to have minimum swap space equivalent to physical memory on the system.

http://bizsupport1.austin.hp.com/bc/.../c02281492.pdf

I am confused i

I have a process that is reporting in 'top' that it has 6GB of resident memory and 70GB of virtual memory allocated. The strange thing is that this particular server only has 8GB physical and 35GB of swap space available.

From the 'top' manual:

o: VIRT -- Virtual Image (kb) The total amount of virtual memory used by the task.

I run a small linux embedded system (2.6.29.6). Kernel loads from Flash into ramdisk (tmpfs). I need to find more ram.

From /proc/meminfo I see I have a 'Cached:' using a lot of memory. My understanding is this is the disk cache. However, I don't have a traditional hard disk. I have a ram disk.

Yesterday, I had a ESXi server working. Total memory required by the deployed virtual machines is higher than the physical RAM. The disk also has a few Gigabytes of free capacity.

Today my server stopped normal operation!

i've made a ramdisk this way:

mkdir -p /media/ramdisk mount -t tmpfs -o size=512M tmpfs /media/ramdisk/

The reason for this is because i run a lot of node.js scripts and their execution time is very small, but i suspect that the time overhead is because it reloads the node.js executable from disk and destroys it on each subsecuent run. So i think this might be the solution to gain a bit, if not

i want to create a tmpfs file system for one of my vm to run on,using XEN Server.

On the host machine i tried this but is not working,.

xe sr-create device-config:device=/dev/shm name-label="RAM" type=tmpfs

Is it possible to make a tmpfs file system using xe command and make the vm run on it rather on HDD.This VM should not be slowed down by waiting for disks(This is what required).Can