similar to: How often is kernel "touching" swap partition?

I can't resist. Read the thread that was pointed to on lkml. ROTFLMAO. *Real* UNIX addressed these problems long ago. I guess the "Gurus" suffer from NIH (Not Invented Here) syndrome. Given a "general purpose" system, tunability is a must. UNIX, as delivered by USL in such examples as Sys V, had tunables that let admins tune to their needs. A single "swappiness"

Is there a way to tell linux "dont ever swap out my program"... Like perhaps a list of programs (some setup file) that if any program in my file listing is running dont consider the program when looking for something to swap out? Does anything like that exist? Thanks, Jerry

Dear CentOS people, This is just a general question related to memory management, and there may have been a thread or two about it before, but I'd like to post anyway. A user was looking at top, whereby he found out that his two processes were 10.2g and 4836m in VIRT. They were 6.4g and 4.6g in RES respectively. 3445964k was free still. He was wondering why the system didn't use

Hi all, I used to use centos 4.5 on an AMD 4800+ with 2GIG ram. Now I use centos 5.1 on AMD 6400+ with 4GIG RAM. The system responsiveness is different between the two. I noticed that centos 5.1 seems to be swapping programs out of memory at times resulting in slowness (perceived by me). I played with swappiness (/proc/sys/vm/) setting to 10, then 1 then 0. Still resulted in the same perceived

Mem: 2075040k total, 1331452k used, 743588k free, 50896k buffers Swap: 2031608k total, 144k used, 2031464k free, 1191532k cached SunFire X2100 running Centos 4.3. Linux maytag1.texoma.net 2.6.9-34.0.2.EL #1 Fri Jul 7 19:24:57 CDT 2006 i686 athlon i386 GNU/Linux rgds/ldv

hi all, I use rsync to copy/backup ALL my stuff to another disk. When I run this seems like my machine (4 GIG ram centos 5.1) now begins to swap out more programs. Is there a way to reduce that swapping? I am running with echo 1 > /proc/sys/vm/swappiness I simply mount /dev/sdc1 /mnt/backup; mkdir /mnt/backup/month.day.year then rsync -a /home /mnt/backup/mon.day.year This is approximately

Has anyone actually used a SSD in a Centos setup? My little experiment with a s/h WD drive for /tmp and SWAP partitions kicked the bucket on Wednesday, when the poor WD drive caught the click-of-death. It was a s/h drive to start with and lasted about 4 months. But that was without the /var/log/ partition being written to it, as I mounted that back onto /var/log from the original drive. So

Hello, I am setting up ProFTPd daemon (from EPEL repository) under CentOS 5.2 and I need encrypted connection. Daemon is configured perfectly, there is no problem - if iptables is off connection is smoothly established, but when iptables is on, connection in FTP client ends on command LIST without response. Last command with response (positive) is PASV. Thank you for your replies Martin ??astn?

We have just discovered that a large buffer cache generated from traversing a lustre file system will cause a significant system overhead for applications with high memory demands. We have seen a 50% slowdown or worse for applications. Even High Performance Linpack, that have no file IO whatsoever is affected. The only remedy seems to be to empty the buffer cache from memory by running

Hi all, This might not be CentOS related at all. Sorry about that. I have lots of C6 & C7 machines in use and all of them have the default swappiness of 60. The problem now is that a lot of those machines do swap although there is no memory pressure. I'm now thinking about lowering swappiness to 1. But I'd still like to find out why this happens. The only common thing between all

Hi all, I order to reach maximum performance on my centos kvm hosts I have use these params: - On /etc/grub.conf: kernel /vmlinuz-2.6.18-164.11.1.el5 ro root=LABEL=/ elevator=deadline quiet - On sysctl.conf # Special network params net.core.rmem_default = 8388608 net.core.wmem_default = 8388608 net.core.rmem_max = 16777216 net.core.wmem_max = 16777216

Am 05.06.2015 um 18:33 schrieb Gordon Messmer: > On 06/05/2015 03:29 AM, Markus "Shorty" Uckelmann wrote: >> some (probably unused) parts are swapped out. But, some of >> those parts are the salt-minion, php-fpm or mysqld. All services which >> are important for us and which suffer badly from being swapped out. > > Those two things can't really both be

Hi All, I have a server that has its swappiness set to 0. It is running a little tight on memory and so there have been a couple of events where the OOM_killer has been invoked and killed off MySQL, which you would expect. Now if you have your swappiness at 0 then "A value of 0 instructs the kernel not to initiate swap until the amount of free and file-backed pages is less than the high

also in /etc/sysctl.d/ On Thu, Dec 24, 2015 at 8:58 AM, Gordon Messmer <gordon.messmer at gmail.com> wrote: > On 12/23/2015 05:08 AM, Ofer Hasson wrote: > >> By running "systemctl status systemd-sysctl" I also receive the same >> output, but a simple "cat /proc/sys/vm/swappiness" returns the default >> value, and not the one set by my conf file.

Hello, I want mount directory of one server to another over internet. I was looking to NFS4, but there are no security mechanisms. I need encrypted connection using private key (something like SFTP). Or - if there is in CentOS repo (or EPEL) package, that can mount directory over internet using private key and make differential backup (like rdiff-backup). Thank you very much for links or other

Am 05.06.2015 um 00:23 schrieb Dennis Jacobfeuerborn: > If I'd have to venture a guess then I'd say there are memory pages that > are never touched by any processes and as a result the algorithm has > decided that it's more effective to swap out these pages to disk and use > the freed ram for the page-cache. That's my guess too. [...] > impact. If however these

Hi people, I got Centos 4.3 on a 1GB Pentium IV machine. The output of free ------------------- $ free total used free shared buffers cached Mem: 1026896 573848 453048 0 2988 131712 -/+ buffers/cache: 439148 587748 Swap: 1052248 137568 914680 ------------------ There is plenty of free ram, but the kernel

Hello, I've recently saw a discussion on this list, about a standardised way of emptying POP3 mailboxes on the server - but no solution came up. Please provide a suggestion for the following situation: - I am running a stock POP3 dovecot server, on Fedora 12 (dovecot version 1.2.9) - passwd-file authentication via /etc/imap.passwd - users are virtual, sharing the same UID/GID; -

I have a 2 node cluster of HP DL380G4s. These machines are attached via scsi to an external HP disk enclosure. They run 32bit RH AS 4.0 and OCFS 1.2.4, the latest release. They were upgraded from 1.2.3 only a few days after 1.2.4 was released. I had reported on the mailing list that my developers were happy, and things seemed faster. However, twice in that time, the cluster has gone down due

Hi All I have xeon server with 16 Gb Ram and no Swap memory.I am running cassandra server on two node in cluster.When there is high load on server kswapd0 kicks inn and take 100% cpu and make machine very slow and we need to restart out cassandra server.I have latest kernel 2.6.18-238.9.1.el5.Please let me know how can i fix this issue .Its hurting us badly this our production server any