Category: dev

iOS Icon/Image guide line

http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/mobilehig/IconsImages/IconsImages.html

Description Size for iPhone 5 and iPod touch (5th generation) Size for high-resolution iPhone and iPod touch Size for iPhone and iPod touch Size for high-resolution iPad Size for iPad Guidelines
App icon (required for all apps) 114 x 114 114 x 114 57 x 57 144 x 144 72 x 72 “App Icons”
App icon for the App Store (required for all apps) 1024 x 1024 (recommended) 1024 x 1024 (recommended) 512 x 512 1024 x 1024 (recommended) 512 x 512 “App Icons”
Launch image (required for all apps) 640 x 1136 640 x 960 320 x 480 1536 x 2008 (portrait)

2048 x 1496 (landscape)

 768 x 1004 (portrait)

1024 x 748 (landscape)

 “Launch Images”
Small icon for Spotlight search results and Settings (recommended) 58 x 58 58 x 58 29 x 29 100 x 100 (Spotlight search results)

58 x 58 (Settings)

 50 x 50 (Spotlight search results)

29 x 29 (Settings)

 “Small Icons”
Web clip icon (recommended for web apps and websites) 114 x 114 114 x 114 57 x 57 144 x 144 72 x 72 “Web Clip Icons”
Toolbar and navigation bar icon (optional) Approximately 40 x 40 Approximately 40 x 40 Approximately 20 x 20 Approximately 40 x 40 Approximately 20 x 20 “Icons for Navigation Bars, Toolbars, and Tab Bars”
Tab bar icon (optional) Approximately 60 x 60 Approximately 60 x 60 Approximately 30 x 30 Approximately 60 x 60 Approximately 30 x 30 “Icons for Navigation Bars, Toolbars, and Tab Bars”
Default Newsstand cover icon for the App Store (required for Newsstand apps) At least 1024 pixels on the longest edge At least 1024 pixels on the longest edge At least 512 pixels on the longest edge At least 1024 pixels on the longest edge At least 512 pixels on the longest edge “Newsstand Icons”

RabbitMQ performance chart

http://www.rabbitmq.com/blog/2012/04/25/rabbitmq-performance-measurements-part-2/

Some Simple Scenarios

auto-ack44824msg/s

This first scenario is the simplest – just one producer and one consumer. So we have a baseline.

no-consume53710msg/s

Of course we want to produce impressive figures. So we can go a bit faster than that – if we don’t consume anything then we can publish faster.

max publish149910msg/s
This uses a couple of the cores on our server – but not all of them. So for the best headline-grabbing rate, we start a number of parallel producers, all publishing into nothing.
max consume64315msg/s
 Of course, consuming is rather important! So for the headline consuming rate, we publish to a large number of consumers in parallel.

Of course to some extent this quest for large numbers is a bit silly, we’re more interested in relative performance. So let’s revert to one producer and one consumer.

mandatory22402msg/s
 Now let’s try publishing with the mandatory flag set. We drop to about 40% of the non-mandatory rate. The reason for this is that the channel we’re publishing to can’t just asynchronously stream messages at queues any more; it synchronously checks with the queues to make sure they’re still there. (Yes, we could probably make mandatory publishing faster, but it’s not very heavily used.)
immediate22035msg/s
 The immediate flag gives us almost exactly the same drop in performance. This isn’t hugely surprising – it has to make the same synchronous check with the queue.
ack32005msg/s
Scrapping the rarely-used mandatory and immediate flags, let’s try turning on acknowledgements for delivered messages. We still see a performance drop compared to delivering without acknowledgements (the server has to do more bookkeeping after all) but it’s less noticeable.
ack-confirm26103msg/s
Now we turn on publish confirms as well. Performance drops a little more but we’re still at over 60% the speed of neither acks nor confirms.
a-c-persist4725msg/s
Finally, we enable message persistence. The rate becomes much lower, since we’re throwing all those messages at the disk as well.

rabbit mq launchctl

###########################################################

# A startup item has been generated that will aid in
# starting rabbitmq-server with launchd. It is disabled
# by default. Execute the following command to start it,
# and to cause it to launch at startup:
#
# sudo port load rabbitmq-server
###########################################################

http://www.rabbitmq.com/install-generic-unix.html

Run RabbitMQ Server

Start the Server
Invoke the sbin/rabbitmq-server shell script. This displays a banner message, and reports on progress in the startup sequence, concluding with the message “broker running”, indicating that the RabbitMQ broker has been started successfully.

You can also start the server in “detached” mode with rabbitmq-server -detached, in which case the server process runs in the background.

Configure the Server
The configuration file $RABBITMQ_HOME/etc/rabbitmq/rabbitmq-env.conf is used to override environment variables. You can customise the RabbitMQ environment by altering this file. Components may be configured, too, in the rabbitmq.config file.