In kinematics, the speed of an object is the magnitude of its velocity (the rate of change of its position); it is thus a scalar quantity. [http://en.wikipedia.org/wiki/Speed]
|< Ã 20 km/h|
|20km/h > vitesse < 30 km/h|
|30km/h > vitesse < 40 km/h|
|40km/h > vitesse < 50 km/h|
|> 50 km/h|
petit rappel aussi, il y a 170 000 morts/ans par accident cardiovasculaires en france...
Oui la route tue, c'est un fait mais ne soyons pas hypocrite ou démagogique non plus, mais sachons rester critique. (bien que pas sur un forum, il y a des énervés des 2 cotés de la barrière, j'espère que les propos suivants ne vous choqueront pas, si tel est néanmoins le cas, contacter moi ici, je les retirerai)
C'est sur a 50km/h (voire 30km/h !!!!) et sans le droit de doubler mÃªme sur des superbe lignes droite Ã la visibilité parfaite (sur des km et des km) les accidents vont baisser.....Noter que quand je roule sur un de mes vieux scooter (manurhin 45km/h en pointe sur du plat) TOUS les automobilistes franchissent les lignes continues alors qu moi mÃªme en moto je ne le fait pas (eh oui)
|At SD Forum 2006, Randy Shoup and Dan Pritchett, both with eBay, gave a presentation on eBay's architecture. Pritchett subsequently posted his presentation slides in his blog, The eBay Architecture.
Predictably, the presentation contained a few inspiring statistics, such as:
Other stats in the presentation related to development process and features, such as:
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.
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
I found Apache POI to slightly better perform with the NoOpLog of apache common!
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:
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.
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
Here is an useful tool for improving performance of your website: The CSS sprite generator takes a number of source images and combines them into a single "sprite" image and supplies CSS to map to each image within the sprite. The technique this tool employs is often used to improve the performance of a web site by reducing the number of HTTP requests that the client's browser needs to make.
CSS sprites are a way to reduce the number of HTTP requests made for image resources referenced by your site. Images are combined into one larger image at defined X and Y coordinates. Having assigned this generated image to relevant page elements the
background-position CSS property can then be used to shift the visible area to the required component image.
This technique can be very effective for improving site performance, particularly in situations where many small images, such as menu icons, are used. The Yahoo! home page, for example, employs the technique for exactly this.
I’ve installed a copy of this tool at:
And took time to:
I really like this small Firefox extension Smushit as it allow to quickly check if all my images are optimized for the best size and thus speed of rendering. But wait IE/Opera/Chrome can still use this bookmarlet :-) to optimize the images found on any web page!
Image optimization is an art that not many people master. There are many good image editing tools that allow us to get the best visual result for a certain file size but "under the hood" a lot more optimization can be done.
Smushit.com is a service that goes beyond the limitations of Photoshop, Fireworks & Co. It uses image format specific non-lossy image optimization tools to squeeze the last bytes out of your images - without changing their look or visual quality. You'll get a report of how many bytes you can save by optimizing your images and all the changed images as a single zip for download.
Saving bytes has never been so easy - you point us in the right direction, and we'll do the rest for you. A ZIP archive with optimized images will be generated for you.
After the huge success and feedback of my first tips on how to speed eclipse, here are more performances tips, some are obvious some not:
Disabled/Exclude the virus scanner for the eclipse directory: while obvious It will or may be difficult to achieve if you're not administrator on your machine (while not impossible) and that may not make some people happy especially security officers ;-) It is obvious that scanning on the fly every resources in a workspace, is detrimental for speed. You'll get at least 15 to 20% more raw input output speed and gain 5 to 15% CPU cycles.
The acronym LAMP refers to a solution stack of software, usually free and open source software, used to run dynamic Web sites or servers. It stand for:
ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give you an impression of how your current Apache installation performs. This especially shows you how many requests per second your Apache installation is capable of serving.
Apache-utils package contains utility programs for webservers and some add-on programs useful for any webserver. These include:
This package Apache-Utils can be install through apt or YaST depending if you are using a Debian base distro or OpenSuse
This module controls the setting of the
HTTP header and the
max-age directive of the
Cache-Control HTTP header in server responses. The
expiration date can set to be relative to either the time the
source file was last modified, or to the time of the client
These HTTP headers are an instruction to the client about the document's validity and persistence. If cached, the document may be fetched from the cache rather than from the source until this time has passed. After that, the cache copy is considered "expired" and invalid, and a new copy must be obtained from the source.
How to activate mod_expires.so
# vi /etc/apache2/conf.d/mod_expires.conf
config is rough right now, but it is better than nothing,put the following in the file
LoadModule evasive20_module /usr/lib/apache2/mod_expires.so
ExpiresDefault "access plus 1 month"
#ExpiresByType text/html "access plus 1 month 15 days 2 hours"
#ExpiresByType image/gif "modification plus 1 month"
#ExpiresByType image/png "modification plus 1 month"
#ExpiresByType image/jpg "modification plus 1 month"
#ExpiresByType text/css "access plus 1 month 15 days 2 hours"
You can also set the expire header by type, but it wa snot working in my case, that is why I use the ExpiresDefault directive
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