Tagged Questions
4
votes
1answer
41 views
can initramfs be paged out to swap disk?
I am using initramfs to boot Centos via PXE. The initramfs used memory is listed within the "cached" value in /proc/meminfo or via free.
Since I need to calculate performance data, I need to know ...
2
votes
0answers
74 views
Linux: Total swap used = swap used by processes +?
So, I'm trying to do some investigation on where does swap use come from in a system with high swap usage:
# free
total used free shared buffers cached
Mem: ...
2
votes
2answers
106 views
Where is the virtual memory stored on hard drive?
If a process wants to access a memory address that is not in physical memory, the OS outsources a page frame from physical memory to the hard drive for later use. Where on the hard drive is this data ...
0
votes
3answers
517 views
kswapd0 takes 99% to 100% CPU in RHEL 6.3
I have 5 systems on which I have just installed RHEL6.
System configuration is
CPU-i7
HDD-500 GB
RAM-2 GB
Swap- 4 GB
I have installed the same software's and all the configuration as per old ...
3
votes
2answers
197 views
Memory management, bias to swapping
I was having 768 MB RAM. In a general day MySQL was using 100-180 mb of RAM and MySQL was swapping 80-120 mb. I was having 50-60 mb free RAM.
So I thought I should upgrade. Then I upgraded my RAM ...
1
vote
1answer
106 views
Which processes swaps memory
I can see swap's total, used, free etc. sizes from top command.
But I can't figure out which process uses swap, is it possible to find out swap memory by process?
I'm running CentOS 6.3.
4
votes
3answers
1k views
Swap usage too high?
I have a debian sid box, freshly installed about a month ago, with no desktop apps running at the moment.
Any command I try to run (via ssh) makes the hard disk work very hard. The system worked ...
0
votes
0answers
211 views
Swap space not used
I recently installed Debian 6.0.6. Here are the machine's states:
CPU - AMD XP 3000+
RAM - 1 Gig
HDD - IDE 80 Gig
I primarily use this machine for developing toy personal projects. When I run ...
1
vote
2answers
2k views
free / top difference. Does free show virtual memory?
free -m shows me the following in my system:
total used free shared buffers cached
Mem: 3954 3842 111 0 248 2585
-/+ ...
2
votes
1answer
485 views
Is it possible to trigger OOM-killer on forced swapping?
Is it possible to have the system preemptively swap out inactive pages (vm.swappiness), but invoke the oom-killer when the system runs out of RAM (as opposed to running out of memory) and is forced to ...
5
votes
2answers
953 views
What is the appropriate value of vm.swappiness when using zram?
I'm using zram on my computer as a compressed RAM-backed swap. When the system needs to swap something out, swapping it to a zram-backed swap file is more or less equivalent to compressing that data ...
2
votes
1answer
406 views
tmpfs and vm.swappiness
I have started tuning a bit Linux VM performance on my system (yes. I know that vm.swappiness=0 will kill kittens but I found 30-40 as much better for me as it improved my latency - probably at cost ...
8
votes
1answer
1k views
What does the vm.swappiness parameter really contol?
Per the kernel documentation:
This control is used to define how aggressive the kernel will swap
memory pages. Higher values will increase agressiveness, lower values
decrease the amount of swap.
...
0
votes
1answer
338 views
Is there a way to kick kswapd and make it swap out pages?
Even though I have set swappiness to 100 and enabled swap, nothing is being swapped out. This is probably because I don't have high memory pressure at the moment. For testing purposes though, I want ...
8
votes
4answers
3k views
how to “unswap” my desktop
If my desktop run out of memory and swaps a lot then I free or kill the application wasting my RAM. But, after that, all my desktop/applications have been swapped and are horribly slow, do you know a ...
2
votes
1answer
191 views
How to reuse Physical memory in the absence of swapping?
How can I reuse physical memory in the absence of swapping?
