I am running through a memory block of binary data byte-wise. Currently I am doing something like this: for (i = 0; i < data->Count; i++) { byte = &data->Data[i]; ((*byte & Masks[0]) == Masks[0]) ? Stats.FreqOf1++; // syntax incorrect but you get the point. ((*byte & Masks[1]) == Masks[1]) ? Stats.FreqOf1++; ((*byte ...
To interact with an external data feed I need to pass a rolling security key which has been MD5 hashed (every day we need to generate a new MD5 hashed key). I'm trading up whether or not to do it every time we call the external feed or not. I need to has a string of about 10 characters for the feed. It's for an ASP.NET (C#/ .NET 3.5) s...
Hi I am developing a Cocoa application which communicates constantly with a web service to get up-to-date data. This considerably reduces the performance of the application. The calls are made to the web service asynchronously but the number of calls is huge. In what ways can I improve the performance of the application? Is there a goo...
After a large SQL Query is run that is built through my ASPX Pages I see the following two items listed in sql profiler. Event Class TextData ApplicationName CPU Reads Writes SQL:BatchCompleted Select N'Testing Connection...' SQLAgent - Alert En...
hi, What are the aspects of style sheets (CSS) that can lead to poor performance of web sites? Anything that can really choke up the CPU? thanks in advance. Sesh ...
Any ideas? See also (dups or near-dups): What is the best way to do loops in JavaScript What’s the best way to loop through a set of elements in JavaScript? ...
Hi! Our app need instant notification, so obvious I should use some some WCF duplex, or socket communication. Problem is the the app is partial trust XBAP, and thus I'm not allowd to use anything but BasicHttpBinding. Therefore I need to poll for changes. No comes the question: My PM says the update interval should be araound 2 sec, an...
I have a fairly large PHP codebase (10k files) that I work with using Eclipse 3.4/PDT 2 on a windows machine, while the files are hosted on a Debian fileserver. I connect via a mapped drive on windows. Despite having a 1gbit ethernet connection, doing an eclipse project refresh is quite slow. Up to 5 mins. And I am blocked from working ...
Hi, I need to create a data transfer object, which I will use for storing the records retrieved from database. In this data transfer object, I need to declare a numeric field. For that which one is better - int or Integer If I am defining the field as Integer, will there be any performance impact because of 'Integer' type if I am going...
I am currently working for a client who are petrified of changing lousy un-testable and un-maintainable code because of "performance reasons". It is clear that there are many misconceptions running rife and reasons are not understood, but merely followed with blind faith. One such anti-pattern I have come across is the need to mark as...
Why would someone use a group by versus distinct when there are no aggregations done in the query? Also, does someone know the group by versus distinct performance considerations in MySQL and SQL Server. I'm guessing that SQL Server has a better optimizer and they might be close to equivalent there, but in MySQL, I expect a significant...
When it comes to writing custom MySQL database-driven PHP session management for a VERY dynamic website, what is the best (fastest read/write access) structure for your session table? Bad Example (Not Optimized): CREATE TABLE `session` ( `session_id` VARCHAR(32) NOT NULL, `session_data` TEXT NOT NULL, `t_created` DATETIME ...
Hi, Say that I have two tables like those: Employers (id, name, .... , deptId). Depts(id, deptName, ...). But Those data is not going to be modified so often and I want that a query like this SELECT name, deptName FROM Employers, Depts WHERE deptId = Depts.id AND Employers.id="ID" be as faster as it can. To my head comes t...
This is just a question to satisfy my curiosity. But to me it is interesting. I wrote this little simple benchmark. It calls 3 variants of Regexp execution in a random order a few thousand times: Basically, I use the same pattern but in different ways. Your ordinary way without any RegexOptions. Starting with .NET 2.0 these do not ge...
I'm currently using ReSharper's 30-day trial, and so far I've been impressed with the suggestions it makes. One suggestion puzzles me, however. When I explicitly define a variable, such as: List<String> lstString = new List<String>(); ReSharped adds a little squiggly green line and tells me to: Use implicitly type local variable ...
Is there a lightweight process execution timer like Unix's time included with Windows? Sometimes I just want a rough estimate, without having to get out a real profiler. While I could roll my own, I would prefer to use an existing solution. ...
After many years of hearing about Vertex Buffer Objects (VBOs), I finally decided to experiment with them (my stuff isn't normally performance critical, obviously...) I'll describe my experiment below, but to make a long story short, I'm seeing indistinguishable performance between "simple" direct mode (glBegin()/glEnd()), vertex array ...
In rails, is it recommended to use form helpers? Internally, everything boils down to plain html then why not write the html directly? Performance will obviously be better in writing direct html than using helpers. Is using form helpers like a convention or something that rails developers must follow? ...
Does anyone know how well F# measures with regards to performance, compared to C#. I have a C# raytracer with a lot of vector manipulations, ray-collission algorithms etc. and throught they might be more easily expressed in F#. I'm not asking for how well F# is at expressing math problems, something which has been answered here, but rath...
On a modern system can local harddisk write speeds be improved by compressing the output stream? This question derives from a case I'm working with where a program serially generates and dumps around 1-2GB of text logging data to a raw text file on the hard disk and I think it is IO bound. Would I expect to be able to decrease runtimes ...