performance

Bookmarks for 31 lug 2012 through 2 ago 2012

These are my links for 31 lug 2012 through 2 ago 2012:

  • Magento optimization Howto – Welcome to this Magento hardcore performance howto, I hope it will be useful.
  • Nginx+PHP(FPM)+MySQL+Memcache+eAccelerator on Debian6 | Qi Yang – I recently rebuild my linux image on Linode, so I have to reinstall the LEMP stack again from ground. Last time was probably more than a year ago, with the help of many tutorials from google. So this time I decide to write what I did step by step for my reference in the future […]
  • Magento caching, APC, eAccelerator Memcached, files, sqlite, Vanish, what’s the … happen? | Alex Paradise – Magento is slow! It’s how start most of the article about Magento cache optimization. Yes, Magento is slow and this because of the way the code is written, extreme object oriented. Stackoverflow say “It is written in an Enterprise Java idiom” and there are right. Anyway, we can’t change anything about it and in one side that let us lot of flexibility.
    So, Magento IS SLOW! And what’s can we do? There is many thing to do, many, many. But the most important one is to work around the cache. I am searching for a cache solution and found so much different stuff like APC, eAccelerator, memcached, tmpfs, varnich, lighthttpd, nginx and so on… I will try to explain the different possibilities if found while my research and finished by the one I will implement[…]
  • Do you have any tips for making WorldClient run faster? – Question:

    Do you have any tips for making WorldClient run faster?

  • MySQL-Galera cluster with HAproxy – Sébastien han – When I started working on Open Stack, I had to investigate about the HA of the nova component. Unfortunatly the nova configuration needed a single entry point to connect to the MySQL database. The solution that came to me was to use HAProxy on top of my existing Galera cluster…

Bookmarks for 25 lug 2012 from 14:52 to 15:47

These are my links for 25 lug 2012 from 14:52 to 15:47:

  • Disaster: LVM Performance in Snapshot Mode – MySQL Performance Blog – In many cases I speculate how things should work based on what they do and in number of cases this lead me forming too good impression about technology and when running in completely unanticipated bug or performance bottleneck. This is exactly the case with LVM
    Number of customers have reported the LVM gives very high penalty when snapshots are enabled (leave along if you try to run backup at this time) and so I decided to look into it.
  • Netexpertise » Mysql Ultra-Fast Backup with LVM – It is generally good practice to respect the two following points when backing up databases. The backup has to be:
    consistent
    fast
    Consistency is easily achieved putting a read lock on all tables beforehands. However, this isn’t always applied, and WILL definately lead to a database integrity problem at some stage.
    Once a lock has been set on the database, the backup has to be as quick as possible, all write instructions being held in the queue.
  • MIME and HTML in Email – How to encapsulate HTML in an email message and send via sendmail

Bookmarks for 18 lug 2012 through 19 lug 2012

These are my links for 18 lug 2012 through 19 lug 2012:

  • Generate large amount of test data « my two cents – I’m using the dictionary on linux systems to generate test data. The shell script below generates test data for MySQL, but similar concepts can be used for other database systems as well.
  • JQueryin | Switching Apache from Prefork to Worker MPM in RHEL / CentOS 5.x / Fedora 13 – I’m going to outline the process of switching from Apache’s default installation of MPM Prefork to that of MPM Worker. I will also be covering the proper installation of FastCGI (mod_fcgid) to further improve your server performance. This guide is ideally intended for individuals running on low-memory VPS servers as memory consumption will likely be far lower with the Worker MPM because it spawns threads as opposed to forking child processes. If you’re intentionally reading this article, you’re probably aware of the performance benefits gained.
  • Free PDF Reader – Sumatra PDF – Sumatra PDF is a free PDF, eBook (ePub, Mobi), XPS, DjVu, CHM, Comic Book (CBZ and CBR) reader for Windows.

    Sumatra PDF is small, portable and starts up very fast.

    Simplicity of the user interface has a high priority.

Bookmarks for 4 giu 2012 through 6 giu 2012

These are my links for 4 giu 2012 through 6 giu 2012:

  • http://www.wormnet.nl/cprules – CPRules.html contains the description of the main program, how to create the html output from the Check Point files and how to influence the output.

    The program uses two supporting libraries and one supporting program. The first is specifically developed for this program to read and manipulate the Check Point databases in memory, called CheckPoint.pm. I hope to use this library for other projects involving Check Point FW-1 databases …

    The other library, Template.pm, is used for creating the html pages from a template, giving more freedom in designing the web pages. The author of this module is Sam Tregar ([email protected]).

    The supporting program CPUsers.pl is to convert the exported userfiles to a CheckPoint database format to be used by CPRules. CPUsers.html describes how it works.

  • How To Calculate Bandwidth Utilization Using SNMP  [IP Application Services] – Cisco Systems – This document describes how to calculate bandwidth use with Simple Network Management Protocol (SNMP).
  • Long range WiFi antenna from Illy coffee can | John Graham-Cumming – I have a stack of half finished projects that I'm trying to complete. Happily, the first one was finished late last night: a long range WiFi antenna made using an empty coffee can. Working from the ideas here I made an antenna from the following:

    1. An empty 250g Illy Espresso ground coffee can

    2. A Type N bulkhead socket and a Type N plug

    3. A piece of WiFi antenna extension cable with a reverse SMA connector on the end.

    4. A short piece of coat hanger for the active element of the antenna

Bookmarks for 16 feb 2012 through 21 feb 2012

These are my links for 16 feb 2012 through 21 feb 2012:

  • QuickPHP Lightweight Standalone Bloat-free Portable (USB stick CD drive Windows Embedded Kiosks) PHP Web Server – Weighing in at just over 500KB in size and using around 9MB of memory with PHP DLL running, QuickPHP is one of the most lightweight fully functional standalone PHP web server in the world today!
  • virtuallyGhetto: Ruby vSphere Console (RVC) 1.6 Released – Rich Lane the creator of Ruby vSphere Console just recently released RVC 1.6 which includes some new features and bug fixes. If you are a current RVC user, you can update to the latest version by using the "gem" utility. For those of you who are not familiar with RVC, it is console UI for vCenter Server and ESX(i) host and it provides a way to interact with your vSphere infrastructure like the vSphere Client but using a console shell. RVC can be installed on a Windows, Linux or Mac OSX system and it's built on RbVmomi which is an open source Ruby library/bindings to the vSphere API.
  • NSClient Error – Could not get data for | Web Paths – I started receiving an error in Nagios that stated:  NSClient – Error: Could not get data for 10 perhaps we don’t collect data this far back?  I started researching the issue, and the obvious solutions weren’t working.

Bookmarks for 30 dic 2011 through 2 gen 2012

These are my links for 30 dic 2011 through 2 gen 2012:

  • fahd.blog: Find Blocking Processes Using sp_who [Sybase] – If a user has executed an insert/update on a table, but not committed the transaction, other users will find that their queries on the same table hang. This is because the table has been locked and the first user's process is blocking everyone else's.
  • Pocket Survival Guide – NetApp –
  • 30 Best Sources For Linux / *BSD / Unix Documentation On the Web – Here are thirty best documentation sites on the web for learning Linux and Unix like operating systems.
  • OpenShift by Red Hat – What is OpenShift?
    OpenShift, is a portfolio of free, portable cloud services for deploying and managing applications in the cloud. Currently there are two application deployment services offered as part of OpenShift; Express & Flex.

    What is OpenShift Express and when should I use it?
    Express is a free, cloud-based application platform for Java, Perl, PHP, Python, and Ruby applications delivered in a shared-hosting model. With just a few commands you’ll be able to deploy your application to the cloud.

    What is OpenShift Flex and why should I use it?
    Flex is a cloud-based application platform for Java EE and PHP. Applications can be deployed on middleware components such as JBoss and Tomcat. Flex is an ideal platform for those who require a greater degree of control and choice over their middleware components with valuable features including versioning, monitoring and auto-scaling.

  • saidar – saidar is a curses-based tool for viewing the system statistics available through libstatgrab. Statistics include CPU, processes, load, memory, swap, network I/O, disk I/O, and file system information.

    "like a small nmon"
    [ via http://www.spippolazione.net/index.php/2011/12/30/saidar ]

Bookmarks for 6 dic 2011 through 7 dic 2011

These are my links for 6 dic 2011 through 7 dic 2011:

  • Monitor Your Website in Real-Time with Apachetop – How-To Geek – As a webmaster, I’ve often wanted to be able to see real-time hits as they arrive. Sure, Google Analytics is a wonderful package for looking at trends over time, but there’s a delay of a few hours there, and you really can’t see data like requests per second or total bytes.

    This is where the apachetop utility comes in. It’s a very simple command line utility that you can use to monitor traffic real-time. It accomplishes this by parsing the apache logfiles and displaying meaningful output to the screen.

  • Ashwin Jayaprakash’s Blog: The little gem that is BusyBox (for Windows) – As a Windows user (no shame) I have, for years searched for a simple GNU-like toolkit – grep, awk, tail and other such goodies enjoyed by Linux users. Yes, there's Cygwin but it's a beast – too big and a pain to install. Sometimes, I've even resorted to starting a Linux VMWare image just to run a simple awk script to munge some log files.
  • pclouds/busybox-w32 – GitHub – Win32 native port for Busybox (latest build can bw found in the below link)

Bookmarks for 17 nov 2011 from 23:06 to 23:56

These are my links for 17 nov 2011 from 23:06 to 23:56:

  • Optimizing WordPress with Nginx, Varnish, APC, W3 Total Cache, and Amazon S3 (With Benchmarks) | danielmiessler.com – So I’ve spent the last couple of weeks tweaking my web server stack. I like my site to pop, and I’ve finally achieved a configuration that I’m somewhat happy with.

    In sum, I’m running Varnish as a front-end to Nginx which is running WordPress loaded with the W3-Total-Cache plugin. The W3-Total-Cache plugin is configured to use both memcached as well as Amazon S3 as its CDN. All of this sits on Ubuntu Linux with Linode as my host.

  • A Varnish Primer | danielmiessler.com – Despite the title, this article has nothing to do with painting. Here I'm going to talk a bit about the Varnish Cache — a web application accelerator designed to dramatically improve how quickly your website loads. Varnish works by caching and serving as much content as possible as "static", including dynamic results, e.g. blog posts from a CMS like WordPress.
  • Varnish best practices « Kristian Lyngstol’s Blog – A while ago I wrote about common Varnish issues, and I think it’s time for an updated version. This time, I’ve decided to include a few somewhat uncommon issues that, if set, can be difficult to spot or track down. A sort of pitfall-avoidance, if you will. I’ll add a little summary with parameters and such at the end.
  • Cain Manor | Setup logging for Varnish – So far, we’ve got Var­nish installed and have a cor­rect default.vcl. Now let’s make sure AWStats/JAW­Stats can read them.

    [Or http://www.hping.org/visitors/ 😉 😉 ]

Bookmarks for 7 nov 2011 through 8 nov 2011

These are my links for 7 nov 2011 through 8 nov 2011:

  • Testing puppet with Jenkins before deploying | mig5.net – […] However, I had overlooked one element: I tend to make a lot of typos […]

    funny and very instructive

  • VMware Monitoring Appliance with Nagios, NagVis, PNP4Nagios, Smokeping, Cacti and OpenNMS – Monitoring in just a few minutes! This VMware appliance based on Ubuntu Server Edition 10.10 64-bit contains the most important monitoring software packages, installed and ready-to-run:

    Nagios 3.2.3
    NagVis 1.5.5
    PNP4Nagios 0.6.7
    MK Livestatus 1.1.8
    Cacti/Spine 0.8.7g
    Smokeping 2.3.6
    OpenNMS 1.8.5

    You can start immediately. It is especially suitable for comparing these different monitoring solutions. Note that OpenNMS is written in Java and produces a high load on the system. Starting and Stopping OpenNMS takes a long time (several minutes!).

  • Squid Block – DNSBL Redirector for the Squid Proxy – dnsbl_redir is a shamelessly derived redirector based on the asqredir redirector written by Thomas Zippo < thomas at zippo dot ch >. Thanks!
    Its been rewritten to use a DNSBL list (RHS type) to check for and block sites listed in the DNSBL. It will redirect your users to the page/site listed in the top of the dnsbl_redir.h file.

    dnsbl_redir is written in C. It consists of one small source file and a small(er) .h file. It has been tested and runs on the current Squid versions. It performs very well on Linux (RedHat/Fedora), BSD and technically should compile and run on any gnu/linux.

Bookmarks for 12 ott 2011 through 15 ott 2011

These are my links for 12 ott 2011 through 15 ott 2011:

  • [Rename Master] – JoeJoe’s freeware utilities – Rename Master is a FREE utility designed to rename multiple files with a just few clicks. Anyone that has worked with websites, file archives, or collections of music, videos, or pictures has probably spent way too much time renaming hundreds of files.

    This utility will add, remove, or replace parts of the filename with ease and also supports renaming via file properties, MP3 tags, JPEG JFIF and EXIF tags, and text files. Batch renaming that's simple to use, yet still very powerful.

  • Sending and Receiving SMS from your Linux Computer LG #164 –
  • collectl – Collectl is a light-weight performance monitoring tool capable of reporting interactively as well as logging to disk. It reports statistics on cpu, disk, infiniband, lustre, memory, network, nfs, process, quadrics, slabs and more in easy to read format.