linux mysql vmstat Post Source: mysqlha.blogspot.com Posted: Nov 29 2008 18:38:00
i wrote this to remember what vmstat output means. i am running a benchmark with mysql and linux on a server with 16gb. i used innodb buf fer pool s ize12g. the process size is 13.6gb. what else uses all of the memory domas investigated the problem and one of the causes is that the per buffer pool page overhead in innodb is high. but a 13.6gb process shouldnt be a problem on a 16gb box...... [Show More]
when fedora 9 shipped just over six months ago bryan and i were not exactly blown away byaa what we saw in fact while we had some positive things to say over all we were not overly impressed. fedora 8 faired even worse in our review for the most part.
one of the major things we complained quite about was the lackluster theme in fedora 8 9 which generated quite a strong r...... [Show More]
stop the presses redhat and amd just announced the end of neverland. .
the big news seems to be that redhat and amd managed to do live migration of a virtual machine between 2 different cpu vendors.
now given my age and my starting alzheimer linuxkongress 2005 in hamburg seems like ages ago
as a speaker giving my automating xen deployments talk early on the first conference day ...... [Show More]
tip 1
is ntp working
step 1 test the current server
try issuing the following command
ntpq pn
remote refid st t when poll reach delay offset jitter
tock.usno.navy 0.0.0.0 16 u 64 0 0.000 0.000 4000.00
the above is an exa...... [Show More]
...rs to it as raid45 thus causing the failure because dmraid or fakeraid cannot find raid45.
during my research for a solution to this problem i have found that there exist a patch httppeo ple.redhat .comheinz m that theoretically solves this problem but you have to create a custom build kernel in order to implement it. this is beyond my skill. i have search the web looking for a fed... [Show More]
why do i care
threading models are often very confusing there are many different models with different tradeoffs and dissecting the details can be tough the first time around. it is important for any large scale project to consider what threading models a programming language supports and what implications the models will have on the system design so that the software syste...... [Show More]
...posix specifies pthread mu tex timedl ock 41 a sibling of pthread mu tex lock 40 which allows a user to specify a timeout interval but its support is only optional see httppeo ple.redhat .comdrepp erposixo ptiongrou ps.html httplis ts.apple.c omarchive sunixpor ting2008 janmsg000 14.html a then we found that even the c standardization committee at the 2007 kona meeting failed to unanimou... [Show More]
...of this to start with but it only went 2 levels deep. then i remembered that james had written something similar but for checking what things any given package depend on.
his is right here httppeo ple.redhat .comjanti llyumcom mandspkg depstree view.py
his went down the dependency tree from a package. i took it and swapped it around to work on provides instead of deps. mine is here
ht... [Show More]
thin lock vs. futex Post Source: bartoszmilewski.wordpress.com Posted: Sep 01 2008 22:36:09
after my post on thin locks several people asked me why not use a futex fast userspace mutex instead. they referred to a linux implementation described in fuss futexes and furwocks fast userlevel locking in linux by franke and russel from ibm. the questions prompted me to do some research and heres what ive found.
futex is not mutex
futex doesn821...... [Show More]
hola
una resea rpida para otra aplicacin de auditoria linux llamada linux audit . este aplicativo es similar a lynis de la que ya hablamos en el blog pero focalizada en red hat enterprise linux rhel y no en unix en general.
linux audit es un desarrollo orientado a rhel y se basa principalmente en un una libreria de captura de eventos de auditoria y en un interfaz ...... [Show More]
eina linux audit Post Source: caballe.cat Posted: Aug 28 2008 21:10:20
el paquet audit inclou una sarie deines per a la definicia de regles dauditoria dels sistemes linux aixa com eines per a lemm agatzematg e i cerca dels registres dauditoria generats pel subsistema dauditoria del nucli 2.6. inclou tamba un sistema basic de deteccia dintrusions a partir dels esdeveniments enregistrats amb la capacitat demetre alertes...... [Show More]
lvm snapshot merging Post Source: feeds.feedburner.com Posted: Aug 10 2008 10:22:22
a red hatos mikulas patocka bejelentette a napokban az lvm snapshot merging munkajanak beta verziajat. a patchek a 2.6.26os kernel logikai katetkezeljahez logical volume manager lvm a devicemapper 1.02.27hez as az lvm 2.2.02.39hez kaszaltek. a fejleszt elmondasa szerint az lvm snapshot merging lehetva teszi szamodra a snapshot tartalmak viss...... [Show More]
volviendo al tono un poco menos noticioso de esta bitacora me gustaraa referenciar la propuesta de ian lance taylor de permitir determinadas caracterasticas de c en el cadigo de gcc sobre todo aquellas que permiten hacer el cadigo mas compacto y mantenible. nombra explacitamente stl polimorfismo y punteros inteligentes en contraposician a la recoleccian de basura que se usa e...... [Show More]
drbd 8.x
dbrd a a acranimo para o nome inglas distributed replicated block device. o drbd consiste num madulo para o kernel de linux que juntamente com alguns scripts oferece um dispositivo de bloco projetado para disponibilizar dispositivos de armazenamento distribuados geralmente utilizado em clusters de alta disponibilidade. isto a feito espelhando conjuntos de blocos via rede ...... [Show More]
por fabio silva em seu blog
recentemente precisei configurar um ambiente com rhel 5.1 cluster suite.
em contato com o pessoal do canal linuxcluster no irc.freenode.net eles me esclareceram algumas davidas e entao consegui montar o ambiente.
assim resolvi criar um howto em portuguas para que fosse disponibilizado na pagina do projeto de cluster da redhat e aqui esta o lin...... [Show More]
quiero cepillarme dentro de poco las particiones de mac y windows que guardo para esas aplicaciones que no van bien en linux. asa que echando mano del tutorial virtualization in linux a review of four software choices me he puesto a probar.
para que quede constancia el sistema mama es ubuntu edgy en un imac el sistema hijito es un windows xp home original que venaa con el portati...... [Show More]
a few new systemtap features that have been eagerly awaited were vetted in fedora and are likely set to start appearing in upcoming redhat releases
a revamped security model that allows for probing by non rootusers without compromising security. an example of why this is useful is detailed in the linked readme.
basic support for userspace probing . a probe can be placed at a location...... [Show More]
my fosdem talk was on icedtea and liveconnect. ive been working on a gcjwebplugin rewrite called icedteaplugin onandoff for the past five months. whereas gcjwebplugin is a netscape 4.x plugin icedteaplugin is an xpcom plugin that implements oji the open jvm interface for liveconnect support. i showed two demos at fosdem one demo for each of the two test applets i821...... [Show More]
... problem.i am heard of memtestbut dont know how to run that in linux.... .please help me...to find out some easy linux package or tool to test ram.
i also tried a script in this link httppeo ple.redhat .comdledf ordmemtes t.html.it took long time for me and also it make my server load to exceed threshold limit.so i gave off this script.is there anyone get positive result using this script p... [Show More]
saludos pido disculpas si hace mucho tiempo no escribaa nada. no lo hacaa por 2 razones principalmente la primera no he tenido mucho tiempo por razones acadamicas y segundo porque estaba esperando que saliera la versian 8 de fedora para ponerme en forma con los tutoriales sobre los mismos. hoy 8 de noviembre acaba de salir la versian 8 de fedora denominada werewolf la cual cuenta con las s...... [Show More]
after upgrading my server from debian sarge to debian etch i decided to enabled selinux. after reading some documentation besides debians basic setup documentation i can recommend fedoras selinux wiki and especially this presentation i got the basic setup working. getting subversion to fully work required a few extra steps. for your convenience and my memory...... [Show More]
if youve been following linux kernel news then youve probably heard about the new completely fair scheduler that has been merged into the upcoming 2.6.23 kernel release . its been a while since ive done much linux kernel hacking so the initial announcement was mostly over my head. after reading about the new scheduler in several places i decided to do a bit of ...... [Show More]
...ed is a kernel that supports ipsec labeling. the easiest way if you are using red hat is to use the current fedora rawhide kernel or the lspp kernel. the lspp kernel is available at httppeo ple.redhat .comsgrub bfilesls pp . for the nonred hat users in the audience labeled ipsec is also available in the released version of linux2.6.22.
youll also need an ipsectools that is capable of labeli... [Show More]
......vic eversa.htm l the secrets of udev and how it works on fedora httpfed ora.redhat .comdocs udev fedora artwork fc6 httpfed oraproject .orgwiki artwork fedora artwork fc7 httppeo ple.redhat .comdfong fc7graphi cs cddvd labels envelopes jackets jewel cases etc. httpfed oraproject .orgwiki artworkcd art networking fundamentals httpfed orasolved. orgnetwor ksolutio... [Show More]
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