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scales Wiki Pages

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Content Tagged scales

Lookup the most popular guitar scales

Get the guitar scale finder that allows you to easily lookup any of the most popular guitar scales to find their fingerings in any position

User:smithsarah06: Lookup the most popular guitar scales

The Guitarists Network - Your Online Guitar Community

The Guitarists Network is THE online resource for guitar players of all ages, styles, and abilities. We have a large collection of guitar tablature, guitar lessons, a guitar chord and scale generator, online guitar resources, news, discussions, and more.

The state of Drupal in China

Jacob Redding, John Zhu, and I ran this session. The three of us talked about China, the Drupal project, and why the Open Source community makes so much sense in the Chinese environment.

opensource: del.icio.us tag/opensource

Notes on scaling heavy concurrent writes in real time

Here is the quick notes from the session scaling heavy concurrent writes in real time by Dathan Pattishall. Its bad that he left Flickr i.e. Yahoo. Hopefully they will find a replacement, if not contact me I have few people who are interested.

  • Who am I
    • since 1999 working on mysql
    • scaled many companies (FriendFinder, Friendster, Flickr, now RockYou)
    • Favorites federation, partitioning, shards, RAID-10
  • Requirements
    • scale better
    • store data forever
    • associate time with the data
    • allow for change
    • keep it cheap
    • and downtime is not an option
  • Spread the data around
    • federate
    • all referrers are owned by the page owner
    • spread data out by that
    • but federate in a different direction
    • add a new column to the global account lookup
  • Did not work
    • strings as PK was not good
    • inserts slowed when the table grew larger than memory
    • not enough I/O to handle double the load
  • Start over
    • converted URL into a 64-bit ID - conv(substr(md5(url),1,16),16,10) (Dathan had a typo in the function in his slides, thanks to Patrick who tried it when the session is running)
    • 64-bit number, its unique
    • reduced PK size to 8 bytes + owner, object, object-type
  • InnoDB and strings
    • index on string takes a lot of space
    • each index has its own 16K page
    • fragmentation across pages was hurting, chewing up I/O
  • InnoDB and High Concurrency of string writes
    • requirement: 200 ms for total db access for all apps
    • writes gets slowed down when you cross buffer_pool_size
    • 10 ms to 20 secs sometimes for full transaction
    • replication keeping up
  • Buffer the writes
    • java daemon that buffers up to 4000 messages grouped to a transaction and apply serially
    • does not use much memory or CPU
    • written by Zen Java master
  • Reduce the use of big strings
  • Keep smaller amounts of data
    • Use MyISAM for non-pro users and keep only X weeks of data
    • MyISAM keeps 1/6th the size of InnoDB
    • Migrate the data when they migrate
  • Distributed locks
    • GET_LOCK and RELEASE_LOCK on the same server for which a user operates on

MySQL: Planet MySQL

JSF Component Libraries : Ryan Lubke's Blog

JSF Component Libraries. See http://blogs.sun.com/theaquarium/entry/jsf_component_libraries_for_glassfish

GlassFish: del.icio.us/tag/glassfish

Be Productive - JSF Component Libraries for GlassFish

Poster for The Matrix Reloaded

The JSF Matrix keeps a table of JSF component libraries (although the comments suggest it needs updating) and Ryan just published a short note pointing to it. Pretty much all the component libraries work with GlassFish (we cheat a bit, most of the AppServers are using Mojarra, our JSF implementation).

Libraries explicitly mentioned by Ryan from those in the JSF Matrix include our own Woodstock, ICEfaces, Apache Trinidad, Apache Tomahawk, JBoss RichFaces and Blueprints. He also lists Mojarra Scales and Mannor'n Rock.

We would like to make it easier for you to run any of these libraries in your GlassFish application; let us know if you discover problems and we will collaborate with the library owners to fix them.

GlassFish: The Aquarium

Raincity Studios and Bryght on Drupal-tour China | Raincity Studios

Raincity Studios' international ambassador of open business (and also CEO) Robert Scales, along with Bryght's honcho (and fellow new web luminary) Kris Krug, are in China for their fourth foray in the past couple of years. This time, it's getting permanen

opensource: del.icio.us tag/opensource

Scala Home Page

Scala is a powerful software tool for experimentation with musical tunings, such as just intonation scales, equal and historical temperaments, microtonal and macrotonal scales, and non-Western scales.

scala: del.icio.us/tag/scala

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