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Google Data Centers virtual visit
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- Details
- Parent Category: Internet www
- Category: Google
- Created on Monday, 29 October 2012 23:45
- Last Updated on Monday, 29 October 2012 23:45
- Published on Monday, 29 October 2012 23:45
- Hits: 1335
2 weeks ago, a post on Google's official blog announced a project that allows users to step inside the private world of its data centers. For the first time, the company's impressive efficiency records and green ethos have been given a face in the form of the stunning photographs by Connie Zhou and the Street View-able hallways of the Lenoir facility in North Carolina...
Apache POI Speed Optimizations
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The Apache POI Project's mission is to create and maintain Java APIs for manipulating various file formats based upon the Office Open XML standards (OOXML) and Microsoft's OLE 2 Compound Document format (OLE2). In short, you can read and write MS Excel files using Java. In addition, you can read and write MS Word and MS PowerPoint files using Java. Apache POI is your Java Excel solution (for Excel 97-2008). We have a complete API for porting other OOXML and OLE2 formats and welcome others to participate.
Switch Off logging
From the documentation at http://poi.apache.org/utils/logging.html
Logging in POI is used only as a debugging mechanism, not a normal runtime logging system. Logging is ONLY for autopsie type debugging, and should NEVER be enabled on a production system. Enabling logging will reduce performance by at least a factor of 100. If you are not developing POI or trying to debug why POI isn't reading a file correctly, then DO NOT enable logging. You've been warned.
In order to effectively disable the logging functionality in Apache POI you must use an alternative logger. This is accomplished by providing a property to the POILogFactory to override the default logger. You can add one of these –D to your JVM settings
-Dorg.apache.poi.util.POILogger=org.apache.poi.util.NullLogger
-Dorg.apache.poi.util.POILogger=org.apache.commons.logging.impl.NoOpLog
I found Apache POI to slightly better perform with the NoOpLog of apache common!
Recompile poi with more adapted settings
You can create a custom build of Apache POI 3.8 and alter the following properties to better match the size of the excel files you are generating or reading:
http://poi.apache.org/apidocs/org/apache/poi/hssf/usermodel/HSSFWorkbook.html#INITIAL_CAPACITY
Don’t use xlsx, prefer xls!
This will only work if you do not reach xls limitations which may avoid you to go to that extreme solution. XLS is not compressed (XLSX is xml based and compressed) and your workbook may double size in memory as a result!
For example, data beyond 256 (IV) columns by 65,536 rows will not be saved in xls! In Excel 2010 and Excel 2007, the worksheet size is 16,384 columns by 1,048,576 rows, but the worksheet size of Excel 97-2003 is only 256 columns by 65,536 rows. Data in cells outside of this column and row limit is lost in Excel 97-2003. But there is a lot more limitations listed at office.com…
The biggest side effect was that my excel file went from 354kb to 967kb, but the speed increase was quite interesting: more than 44% less evaluation time.
Small localized optimization
I don’t think these bring a lot of speed, JIT should optimize this bad piece of code for us but it is always worth trying Speeding up org.apache.poi.hssf.usermodel.HSSFRow.compareTo() and http://affy.blogspot.ch/2004/04/poi-optimization-speeding-_108265938673224937.html
Samsung wins patent battle against apple
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- Details
- Parent Category: Gadget
- Category: Cellphone
- Created on Monday, 29 October 2012 23:33
- Last Updated on Monday, 29 October 2012 23:33
- Published on Monday, 29 October 2012 23:33
- Hits: 1127
Samsung / Apple UK judgment from http://www.apple.com/uk/legal-judgement/
Apple is a kid with way too much power at the moment.
On 9th July 2012 the High Court of Justice of England and Wales ruled that Samsung Electronic(UK) Limited’s Galaxy Tablet Computer, namely the Galaxy Tab 10.1, Tab 8.9 and Tab 7.7 do notinfringe Apple’s registered design No. 0000181607-0001. A copy of the full judgment of the Highcourt is available on the following link www.bailii.org/ew/cases/EWHC/Patents/2012/1882.html.
In the ruling, the judge made several important points comparing the designs of the Apple and Samsung products:
"The extreme simplicity of the Apple design is striking. Overall it has undecorated flat surfaces with a plate of glass on the front all the way out to a very thin rim and a blank back. There is a crisp edge around the rim and a combination of curves, both at the corners and the sides. The design looks like an object the informed user would want to pick up and hold. It is an understated, smooth and simple product. It is a cool design."
"The informed user's overall impression of each of the Samsung Galaxy Tablets is the following. From the front they belong to the family which includes the Apple design; but the Samsung products are very thin, almost insubstantial members of that family with unusual details on the back. They do not have the same understated and extreme simplicity which is possessed by the Apple design. They are not as cool."
That Judgment has effect throughout the European Union and was upheld by the Court of Appeal on 18 October 2012. A copy of the Court of Appeal’s judgment is available on the following link www.bailii.org/ew/cases/EWCA/Civ/2012/1339.html. There is no injunction in respect of the registered design in force anywhere in Europe.
However, in a case tried in Germany regarding the same patent, the court found that Samsung engaged in unfair competition by copying the iPad design. A U.S. jury also found Samsung guilty of infringing on Apple's design and utility patents, awarding over one billion U.S. dollars in damages to Apple Inc. So while the U.K. court did not find Samsung guilty of infringement, other courts have recognized that in the course of creating its Galaxy tablet, Samsung willfully copied Apple's far more popular iPad.
The extreme simplicity of the following design is also striking, Can I enforce a patent?
Neo Geo X Gold Limited Edition pre order available
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- Details
- Parent Category: vintage gaming
- Category: SNK Neo Geo
- Created on Tuesday, 23 October 2012 20:05
- Last Updated on Tuesday, 23 October 2012 20:05
- Published on Tuesday, 23 October 2012 20:05
- Hits: 1468
The NEOGEO X Gold entertainment system comes complete with the NEOGEO X Station, the NEOGEO X Handheld with 20 pre-loaded NEOGEO classic titles, and the NEOGEO X Joystick. In addition to coming pre-loaded with 20 NEOGEO classic titles, the NEOGEO X Handheld device features a crisp 4.3-inch LCD display, an expandable game card slot, internal stereo speakers, and a 3.5mm headphone jack for a personal gaming experience you can take anywhere. The NEOGEO X Handheld device works with the NEOGEO X Joystick and NEOGEO X Station to charge the handheld device and transfer the action directly to a television set or monitor, via HDMI or A/V out, for a true arcade experience right at home! The NEOGEO X Gold Limited Edition is only available for pre-orders made before 12/6. The NEOGEO X Gold Limited Edition comes with the Ninja Master's NEOGEO X Game Card.
As a NeoGeo fans since 1991, I will pre order at least 2 of them if not more 
- Limited Edition - Includes the NEOGEO X Ninja Master's game card.
- Play anywhere - At home or on the go.
- 20 pre-loaded classic Neogeo games.
- Home arcade experience with the NEOGEO X Station when the NEOGEO X Handheld is docked inside and the NEOGEO X Arcade Stick is plugged in. Outputs to TV via HDMI or A/V out.
- Contents include: NEOGEO X Station, NEOGEO X Handheld, One NEOGEO X Arcade Stick, and Ninja Master's NEOGEO X game card
- 4.3 inch LCD screen,
- Expandable game card slot, stereo speakers and a headphone port.
Read more: Neo Geo X Gold Limited Edition pre order available
Linux server Monitoring mind map
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I did create this mind map a while ago, and found it while going through my dropbox folders. Linux server Monitoring “You can't correct something you can't measure” is in version v 1.0.0
You’ll find in this mind map
What to monitor, how and the most useful commands to detect what happening on your Linux server.
Why a mind map?
A mind map is a diagram used to visually outline information. mind map help you take notes, brainstorm complex problems, and think creatively.
- Information are summarized efficiently to be usable and accessible,
- Inter-relationships are clear between the different concepts,
- It is the most flexible for organizing associative, divergent and convergent thinking (Convergent thinking involves aiming for a single, correct solution to a problem, whereas divergent thinking involves creative generation of multiple answers to a set problem),
