performance

Bookmarks for 8 feb 2010 from 14:31 to 17:26

These are my links for 8 feb 2010 from 14:31 to 17:26:

  • Performance Tuning with "nmon" – Use this WebWizard to start Performance Tuning your IBM pSeries running AIX. This WebWizard assues you are using a freely available and very useful tool called nmon – full detail on getting this are below. nmon – is strongly recommended as it provides all the AIX statistics constantly updated on a "dumb" screen.
  • IBM Performance Management for Power Systems : overview – Your IBM Power™ Systems model (including the IBM System i®, the IBM System p® and the new POWER6™ models) can be one of your company's most valued assets. But it is an absolute requirement you understand the utilization and growth of your system to help with making better plans for reducing cost, improving service and managing risk. Building a dynamic infrastructure that accommodates the changing demands of your business in a planet becoming smarter is critical.
  • Tuning and hardening Squid | Christian Schenk – Tuning and hardening Squid will be the topic of this post, where tuning means making it a little bit faster and hardening means less vulnerable to malicious use.

Bookmarks for 30 gen 2010 through 7 feb 2010

These are my links for 30 gen 2010 through 7 feb 2010:

  • flashrom – flashrom is a utility for identifying, reading, writing, verifying and erasing flash chips. It's often used to flash BIOS/EFI/coreboot/firmware images.
    via ossblog
  • glype proxy script – free anonymous proxies list – Glype proxy script is a free-to-use, web-based proxy script written in PHP. Similar to a typical proxy server, a web-proxy script downloads requested web pages and files and forwards them back to the user. The service is provided by a web page itself, which allows instant access to the proxy without editing your browser connection settings[…]

    via .mau.

  • Repairing and re-registering the WMI – If you experience behavior when using WMI, such as application errors or scripts that used to work are no longer working, you may have a corrupted WMI repository. To fix a corrupted WMI repository, use these step…
  • Tuning the AIX file caches – Wikistix – By default, AIX is tuned for a mixed workload, and will grow its VMM file cache up to 80% of physical RAM. While this may be great for an NFS server, SMTP relay or web server, it is very poor for running any application which does its own cache management. This includes most databases (Oracle, DB2, Sybase, PostgreSQL, MySQL using InnoDB tables, TSM) and some other software (eg. the Squid web cache).

    Common symptoms include high paging (high pgspin and pgspout in topas), high system CPU time, the lrud kernel thread using CPU, slow overall system throughput, slow backups and slow process startup.

    For most database systems, the ideal solution is to use raw logical volumes. If this is not acceptable, then direct I/O and concurrent I/O should be used. If for some reason this is not possible, then the last solution is to tune the AIX file caches to be less aggressive

Bookmarks for 26 gen 2010 through 30 gen 2010

These are my links for 26 gen 2010 through 30 gen 2010:

  • Network monitoring with Nagios and OpenBSD – Una guida in italiano all'installazione configurazione di nagios sotto BSD
  • UNIX Performance Management – The purpose of this paper is to introduce the performance analyst to some of the free tools available to monitor and manage performance on UNIX systems, and to provide a guideline on how to diagnose and fix performance problems in that environment. The paper is based on the author’s experiences with AIX and will cover many of the tools available on that and other UNIX platforms. It will also provide some Rules of Thumb for analyzing the performance of UNIX systems. The paper has been updated to include some of the things that can be done in order to make sure that the web server will perform well.
  • UNIX BASH scripting: Replace values in XML using sed and awk – […]Even though sed or awk is not suggested to work with XMLs (generally a programing language like Perl or Python is more preferred), there can be simple cases where we can make use of sed or awk to perform certain search and replace in simple XML s. Here is an simple example[…]

    che fico 🙂

Bookmarks for 28 dic 2009 from 00:30 to 23:21

These are my links for 28 dic 2009 from 00:30 to 23:21:

  • The Beginner’s Guide to The Geek Stuff – A Guided Tour – We’ve published quite a few high quality articles on UNIX/Linux and open source since this blog was started on May 2008. This post is a quick reference guide to all the popular posts in this blog.

    You might want to go through all these posts in detail by trying out the commands and software mentioned in these posts yourself. However, it is going to a take a while to read all these posts. Make sure to bookmark this article for future reference.

  • AIX – monitoring – IBM developerWorks: Wikis – Below is my reference card notes on the most useful monitoring tools available on AIX and the most useful parameters.
    If you see mistakes please correct them.
    If you have other favourites please add them.
    The Tips and techniques page is the place for discussions on tuning approach and ideas.
  • Flexamail – We make mail do more! – Flexamail allows you to control the web while never leaving the comfort of your inbox. You can post images, share files even surf the web! If you know how to use email, you already know how to use Flexamail. Easy to learn, easy to use, yet powerful.

    With Flexamail, you can:
    Access popular sites like Twitter and Facebook all from your email without needing a proxy
    Avoid pesky firewalls getting in your way, access websites and services regardless to your office or country's firewall settings
    Post, share and track any type of files and images online
    Password protect those files you don't want made public
    Securely backup your files online
    Save money on your cellphone plan with an email only data plan
    Publish a photo from your iPhone or Blackberry without needing to open an app
    Stay organized with sortable, sharable, drag and drop lists
    Best of all, it's free!

Bookmarks for 11 dic 2009 through 15 dic 2009

These are my links for 11 dic 2009 through 15 dic 2009:

  • ASCII Paint – Enjoy drawing and viewing some crazy ascii art. Output can be in C/C++/Java style comments Assembly comments, or the million other languages that support the # – sign comments.

    Use the buttons to change what your cursor does. Hit whatever key on the keyboard you want to be drawing with.

    If you make something cool, share it! It will be added to our database of ascii art, which will become much more accessible as time goes on. Right now you can only see random Ascii Art, but there will be a voting system shortly.

    via LevySoft

  • Scapy – Scapy is a powerful interactive packet manipulation program. It is able to forge or decode packets of a wide number of protocols, send them on the wire, capture them, match requests and replies, and much more. It can easily handle most classical tasks like scanning, tracerouting, probing, unit tests, attacks or network discovery (it can replace hping, 85% of nmap, arpspoof, arp-sk, arping, tcpdump, tethereal, p0f, etc.). It also performs very well at a lot of other specific tasks that most other tools can't handle, like sending invalid frames, injecting your own 802.11 frames, combining technics (VLAN hopping+ARP cache poisoning, VOIP decoding on WEP encrypted channel, …), etc.

    via downloadblog.it

  • Mac usati e iPod usati / MacExchange – annunci di Mac o iPod usati

    via http://www.bufferoverflow.it/

  • Top 20+ MySQL Best Practices – Nettuts+ – Database operations often tend to be the main bottleneck for most web applications today. It's not only the DBA's (database administrators) that have to worry about these performance issues. We as programmers need to do our part by structuring tables properly, writing optimized queries and better code. Here are some MySQL optimization techniques for programmers.
  • Stacklet | Create Virtual Images On The Fly – This site will be the home of all development of the stacklet engine, a new way of creating bootable images for virtualization software such as Xen. In addition to hosting the software for creating images, the site will have pre-built images spanning various operating systems, distributions and application niches. This is a large undertaking and hopefully by opening the software we can elicit multiple contributors and contributions.