performance
So I am using C# (This question is also valid for similar languages like C++) and I am trying to figure out the fastest and most efficient way to increment. It isn't just one or two increments, in my game , its like 300 increments per second. Like the Frames of every sprite on the screen are incrementing , the speed and positions of my rpg character , the offset of the camera etc. so i am thinking, what way is the most efficient? e.g for incrementing 5 y_pos on every movement I can
I'm evaluating hosted production environments and currently have interest in Google App Engine.
Currently I'm enjoying the free quotas. I'm concerned if it is efficient to scale up using
Google App Engine. Portability is being analyzed as well.
Please advise if Google App Engine is good for scalability and portability.
Thank you in advance.
Portability is guaranteed by the fact that Google has open-sourced all the parts of App Engine that live "in front of" the RPC layer,
I have a fairly simple query:
SELECT
col1,
col2…
FROM
dbo.My_Table
WHERE
col1 = @col1 AND
col2 = @col2 AND
col3 <= @col3
It was performing horribly, so I added an index on col1, col2, col3 (int, bit, and datetime). When I checked the query plan it was ignoring my index. I tried reordering the columns in the index in every possible configuration and it always ignored the index. When I run the query it does a clustered index scan (table size is
Have you ever had to justify the choice over using .Net instead of Java based on performance?
For a typical high volume transaction processing system that can perform the following operations,
Concurrent Database transactions
Mathematical computations
Interaction with other web services (SOAP/XML, XML-RPC)
My approach would be to code benchmark tests in both Java for the JVM and C# for .Net CLR that benchmark the above operations under various levels of load and compare the
It seems to be fairly accepted that including the schema owner in the query increases db performance, e.g.:
SELECT x FROM [dbo].Foo vs SELECT x FROM Foo
This is supposed to save a lookup, because SQL Server will otherwise look for a Foo table belonging to the user in the connection context.
Today I was told that always including the database name improves the performance the same way, even if you are querying the database you selected in your connection string:
SELECT x FROM
I'm developping an XNA game and I usually start my application in windowed mode for debug purposes. For strange reasons, my application is 50% slower in windowed mode than in fullscreen mode.
Can someone tell me why and how the windowed mode affects the framerate ?
Check this similar question. The guy explains clearly why this behavior happens.
I recently wrote a Vector 3 class, and I submitted my normalize() function for reviewal to a friend. He said it was good, but that I should multiply by the reciprocal where possible because "multiplying is cheaper than dividing" in CPU time.
My question simply is, why is that?
Think about it in terms of elementary operations that hardware can more easily implement -- add, subtract, shift, compare. Multiplication even in a trivial setup requires fewer such elementary steps --
I'm seeing consistently high CPU usage for my ASP.NET web application (on the live production box only, naturally....!) and I'm trying to narrow down the cause - it's basically maxing out a quad core Xeon box and there's no way it should be able to do that!
The CPU usage of the web process is generally higher than that of the DB process - which rings alarm bells to me on its own (?).
However, using the standard profiling tools (dotTrace, Red Gate etc) only show you the time spent in
I'm relatively inexperienced when it comes to Unit Testing/Automated Testing, so pardon the question if it doesn't make any sense.
The current code base I'm working on is so tightly coupled that I'll need to refactor most of the code before ever being able to run unit tests on it, so I read some posts and discovered Selenium, which I think is a really cool program.
My client would like specific automated tests to run every ten minutes on our production server to ensure that our site
I've been working on a legacy ASP.NET Web Site (versus a Web Application) project at a client for some time now, and its slow compile time has me wondering:
Are web site projects known to be slow(er) at compiling (than Web Application projects)?
It's a pretty small website, but the entire solution has tons of functionality -- 19 projects worth of it, 18 of which compile really quickly (the non-web projects). The website project itself has ~100 pages and ~15 user controls (these
I need to do some performance/load testing on this website - Information Queensland Atlas
In the past I have used Jmeter and WAPT 5 with reasonable success however in those cases the websites being testing did not make use of AJAX. For the website above I need to simulate a number of users and determine the capacity of the current server infrastructure so that the maximum response time is less than 10 seconds.
The response time needs to be measured when the final image tile is
Given a long string L and a shorter string S (the constraint is that L.length must be >= S.length), I want to find the minimum Hamming distance between S and any substring of L with length equal to S.length. Let's call the function for this minHamming(). For example,
minHamming(ABCDEFGHIJ, CDEFGG) == 1.
minHamming(ABCDEFGHIJ, BCDGHI) == 3.
Doing this the obvious way (enumerating every substring of L) requires O(S.length * L.length) time. Is there any clever way to do this in