Discuss

discuss@lists.centos.org

34758 discussions

Increased memory usage between 4.8 and 5.5
by Bryan Stillwell 20 Oct '10

20 Oct '10

I'm running into a memory problem when trying to switch some web servers that are running centos4.8/x86_64 to centos5.5/x86_64. The new servers running centos5.5 are using a decent amount more memory than the centos4.8 servers. Here's an example from top: --- centos 5.5 --- $ uname -a Linux ws51 2.6.18-194.17.1.el5 #1 SMP Wed Sep 29 12:50:31 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 7799 nobody 16 0 348m 101m 43m S 0.0 2.6 1:10.91 httpd 20285 nobody 15 0 340m 94m 43m S 0.0 2.4 1:11.36 httpd 31734 nobody 15 0 340m 91m 41m S 0.0 2.3 1:13.52 httpd 8904 nobody 15 0 341m 89m 39m S 0.0 2.3 0:35.28 httpd 7353 nobody 15 0 336m 87m 42m S 0.0 2.2 1:21.17 httpd 26097 nobody 15 0 333m 87m 43m S 0.0 2.2 1:28.84 httpd 20765 nobody 15 0 335m 86m 42m S 0.0 2.2 0:48.50 httpd 23299 nobody 15 0 334m 86m 42m S 0.0 2.2 1:13.35 httpd --- centos 4.8 --- $ uname -a Linux ws89 2.6.9-89.0.28.ELsmp #1 SMP Fri Aug 20 16:11:39 EDT 2010 x86_64 x86_64 x86_64 GNU/Linux PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 25117 nobody 16 0 244m 57m 41m S 0.0 1.5 0:58.23 httpd 21318 nobody 15 0 240m 53m 41m S 0.0 1.3 0:53.25 httpd 18517 nobody 16 0 239m 51m 41m S 0.0 1.3 0:41.97 httpd 10383 nobody 15 0 238m 50m 40m S 0.0 1.3 0:31.07 httpd 29560 nobody 16 0 239m 49m 39m S 0.0 1.3 0:40.39 httpd 32459 nobody 16 0 238m 49m 40m S 0.0 1.3 0:23.07 httpd 8441 nobody 15 0 238m 48m 39m S 0.0 1.2 0:22.87 httpd 1350 nobody 15 0 238m 48m 39m S 0.0 1.2 0:29.83 httpd The versions of both apache and php I have installed are the same between the two releases, so I can't imagine that being the problem. I've also tested newer versions and it doesn't seem to make a difference. I've looked into this quite a bit and below is what I've figured out so far. Looking at the output of running 'pmap -x <pid>' shows most of the libraries in 5.5 are using 2044K or 2048K of memory, but in 4.8 they're all using 1024K or less. Example: --- centos 5.5 --- 00002b37c3248000 16 16 0 r-x-- libnss_dns-2.5.so 00002b37c324c000 2044 0 0 ----- libnss_dns-2.5.so 00002b37c344b000 4 4 4 r---- libnss_dns-2.5.so 00002b37c344c000 4 4 4 rw--- libnss_dns-2.5.so --- centos 4.8 --- 0000002aa4a5e000 16 - - - r-x-- libnss_dns-2.3.4.so 0000002aa4a62000 1020 - - - ----- libnss_dns-2.3.4.so 0000002aa4b61000 4 - - - r---- libnss_dns-2.3.4.so 0000002aa4b62000 4 - - - rw--- libnss_dns-2.3.4.so This seems to be explained by an increase in ELF_MAXPAGESIZE between the two releases according to this page: http://www.greenend.org.uk/rjk/2009/dataseg.html Another oddity I found that was only in centos 5.5 was a lot of heap memory being marked as Private_Dirty according to /proc/<pid>/smaps: 2b37c9826000-2b37cc4ca000 rw-p 2b37c9826000 00:00 0 [heap] Size: 45712 kB Rss: 45424 kB Shared_Clean: 0 kB Shared_Dirty: 1580 kB Private_Clean: 0 kB Private_Dirty: 43844 kB Swap: 0 kB Pss: 43913 kB The highest amount of Private_Dirty showing up on 4.8 is just 1628 kB. Does anyone have any ideas on why 5.5 is using so much memory per httpd process than it does in 4.8? I have 100+ machines I want to upgrade, but that'll have to wait until I figure out why apache uses so much more memory in 5.5... Thanks in advance, Bryan

1 0

Who maintains php-pgsql package? I want to ask about using PostgreSQL 8.4 library instead of PostgreSQL 8.1.
by Aleksey Tsalolikhin 19 Oct '10

19 Oct '10

How do I find out who is the maintainer of the php-pgsql package, please? I want to request upgrade from underlying postgresql-libs-8.1.21 (/usr/lib64/libpq.so.4) to postgresql84-libs-8.4.4 (/usr/lib64/libpq.so.5.2). Background on this request: Apache httpd's php's php-pgsql uses PostgreSQL 8.1 library (/usr/lib64/libpq.so.4), which leaks memory. PostgreSQL 8.4 library does not leak. Apache HTTP Server: httpd-2.2.3-43.el5.centos.3 mod_php: php-5.1.6-27.el5 PHP PostgreSQL interface is provided by: php-pgsql-5.1.6-27.el5, which uses postgresql-libs-8.1.21-1.el5_5.1 which provides /usr/lib64/libpq.so.4 which we've observed has a memory leak (and this memory leak is NOT present in libpq.so.5.2) I am trying to figure out how to get our httpd/mod_php/php-pgsql to use libpq.so.5.2 instead of libpq.so.4, and I thought I'd start by asking the php-pgsql maintainer, so this problem is fixed for everybody, not just for me. Please let me know if I can help in any way. Kind regards, Aleksey

4 6

Automated Reply from Dieter Thiel <centos-announce@centos.org>=
by Dieter Thiel = 19 Oct '10

19 Oct '10

Abwesenheitsnotiz: Vielen Dank für Ihre Nachricht. Ich bin ab dem 22.10. wieder im Büro erreichbar. In dringenden Fällen wenden Sie sich bitte an Herrn Ostermann, Email <ostermann(a)dimast.de>. Vielen Dank!

1 0

dhcpd rpm
by m.roth＠5-cent.us 19 Oct '10

19 Oct '10

Folks, We've been having occasional issues with failover dhcpd. I went looking for "peer holds all free leases", and happened to run across <https://bugzilla.redhat.com/show_bug.cgi?format=multiple&id=610219>, which is rated important, and is supposed to be fixed in 3.0.5-24. Looking at the repo at kernel.org, all I see is what we have, dhclient-3.0.5-23.el5.x86_64.rpm. Any idea when this update will be released? mark "we won't mention 3.1 or 4.x"

6 7

FYI: Red Hat Enterprise Linux 6 Release Candidate Available to Partners
by Timo Schoeler 19 Oct '10

19 Oct '10

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 There's progress... http://press.redhat.com/2010/10/18/red-hat-enterprise-linux-6-release-candi… Cheers, Timo -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.5 (GNU/Linux) iD8DBQFMvEWlfg746kcGBOwRAtHpAJ9/ylHRb8hAIBp4mvaNSPN36qrkzACfafrY 628MfhiRdSkK+9FWRuE8wJQ= =NtpF -----END PGP SIGNATURE-----

13 21

wireless
by David 19 Oct '10

19 Oct '10

Hi folks I have a CentOS box with 2 network cards. One is eth0 and the other is wlan0 (Linksys WUSB54GC USB wifi card) I use wlan0 to stay linked with other workstations in an small network and eth0 just in case I need to get wired to solve some problem. eth0 is always unpluged while things are going ok. Te problem is everytime my AP is turned off for whatever reason or the link is down, no matter the AP is working again, my wlan0 stays without link. Then I have to reboot to get wireless linked again. I'm not running Network Manager, For some reason, everytime I tried to start it, it just mess my network, trying to make wlan0 to get an IP from a DHCP server, no matter wlan0 have it's own IP address specified in ifcfg-wlan0. The Centos Box is unattended and everytime it happens I have to go to the other room and press the on/off button to restart it. (no display, keyboard or mouse in it) Any advices? How could I make NetworkManager to just link it again and not start messing with my network configuration? Cheers David

1 0

best practices in using shared storage for XEN Virtual Machines and auto-failover?
by Rudi Ahlers 19 Oct '10

19 Oct '10

Hi all, Can anyone pleas tell me what would be best practice to use shared storage with virtual machines, especially when it involved high availability / automated failover between 2 XEN servers? i.e. if I setup 2x identical XEN servers, each with say 16GB RAM, 4x 1GB NIC's, etc. Then I need the xen domU's to auto failover between the 2 servers if either goes down (hardware failure / overload / kernel updates / etc). What is the best way to connect a NAS / SAN to these 2 servers for this kind of setup to work flawlessly? The NAS can export iSCSI, NFS, SMB, etc. I'm sure I could even use ATAOE if needed -- Kind Regards Rudi Ahlers SoftDux Website: http://www.SoftDux.com Technical Blog: http://Blog.SoftDux.com Office: 087 805 9573 Cell: 082 554 7532

4 4

exim quota
by Helmut Drodofsky 19 Oct '10

19 Oct '10

exim quota uses 32 bit integer: maximum mail store quota must be less than 2GB. Is there an repository with exim compiled with Size of off_t: 8 instead Size of off_t: 4 Comments in discussion groups say, the version compiled with "Size of off_t: 8" accepts lager quota. Helmut

1 0

Not receiving mail
by Dotan Cohen 18 Oct '10

18 Oct '10

I have installed Postfix, Dovecot, and Squirrelmail on a CentOS 5.5 machine. In Squirrelmail a user can send mail, but he is not receiving replies. There is nothing relevant in the maillog other than the user's (successful) login attempts. I am at loss, I have been following tutorials such as the Perfect Server [1] series and other Google results, but I cannot get this thing to receive mail. What should I be checking? Thanks! [1] http://www.howtoforge.com/perfect-server-centos-5.5-x86_64-ispconfig-2 -- Dotan Cohen http://gibberish.co.il http://what-is-what.com

5 7

Password Expiry
by Manish Kathuria 18 Oct '10

18 Oct '10

Hello, Is there any command / option available on CentOS to expire a user's password immediately ? I remember using "passwd -e" on some other distribution but the -e option does not seem to be present on CentOS 5.x. Thanks, Manish

3 3

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

Discuss