I have a WCF net.tcp service hosted with the builtin ServiceHost, and when doing some stress tests I get a strange behavior. The first time i send a bunch of requests, 5 to 10 requests are answered quickly, and the rest are returning at about 2 second intervals. The second time i send the requests, 10 - 20 are returned quickly, and rest ...
Hi, I want to test the speed of an algorithm, what DateTime overload will give me the most precise time? (I still need day/month/year/seconds but then I want milliseconds also). ...
Since MySQL started supporting stored procedures, I've never really used them. Partly because I'm not a great query writer, partly because I often work with DBAs who make those choices for me, partly because I'm just comfy with What I Know. In terms of doing data selection, specifically when considering a select that is essentially a d...
I have a large collection of strings (up to 1M) alphabetically sorted. I have experimented with LINQ queries against this collection using HashSet, SortedDictionary, and Dictionary. I am static caching the collection, it's up to 50MB in size, and I'm always calling the LINQ query against the cached collection. My problem is as follows...
On my laptop with Intel Pentium dual-core processor T2370 (Acer Extensa) I ran a simple multithreading speedup test. I am using Linux. The code is pasted below. While I was expecting a speedup of 2-3 times, I was surprised to see a slowdown by a factor of 2. I tried the same with gcc optimization levels -O0 ... -O3, but everytime I got t...
C# .NET 2.0 if that turns out to be applicable. I'm going to start to get to the bottom of why a web service we have is acting slow - this web service jumps over a proxy, into another domain, queries a stored procedure for some data, and then returns a int/string/dataset, depending on what I asked for. I just wrote a console app that qu...
I'm trying to understand how CSS sprites improve performance on a site? Why is the downloading of several small images slower than the download of a single image holding the smaller images if the total size of the single image is the sum of the smaller images? ...
Where can i find information on the differences between compiling a swf in release or in debug? I would like to know about differences in terms of file size, memory consumption, and overall. ...
With a Javascript Array, I can reset it to an empty state with a single assignment: array.length = 0; This makes the Array "appear" empty and ready to reuse, and as far as I understand is a single "operation" - that is, constant time. Is there a similar way to clear a JS Object? I know I can iterate its fields deleting them: for (pr...
hey guys i wanted to know the best way to get this thing done: i have a huge table with +40k records (tv show titles) in sqlite and i want to do real time lookups to this table. for eg if user searches for a show, as and when user enters search terms i read sqlite and filter records after every keystroke (like google search suggestion) ...
I have a series of forms and navigate between them. Each form has a set of controls for which I load properties from SQLite database and this is the long (about 1s) operation that doesn't give users the best feeling because the form is gradually being drawn. I don't quite mind the delay but I'd like the form to be drawn when all data...
Hi I'm writing a WPF client app, using Linq to Sql with Sql Compact edition. The db is relatively small (3MB) and read-only. Bottom line is that The performance are not as good as I hoped them to be, and I'm looking for tips and practical ways to increase that. More facts: The schema contains around a dozen of entities with extensive r...
Polling servers seems to be a theme that comes up for certain types of enterprise applications, particularly social networking web applications. From what I have read, people on the Unix side use memcache that can give you a few thousand requests per second. What options do Windows developers have since we don't have a memcache alterna...
Suppose you have a very large database, and to simplify lets say it consists of one major table you will be doing your lookups on with one (and only one) primary key field - pk. Given the fact that all lookups are going to be basically SELECT * FROM table_name WHERE pk=someKeyValue, what is the best way to optimize this database for the...
Hello all, I am facing the problem to handle many xml-files that are all greater than 70 MB. Validating and accessing them cost a lot of time. Now I am wondering if the following steps could increase my applications performence. I can compress a 70MB xml-file in a gzip-file < 1MB. So I could hold only gzip files. Working with the data...
I have a program that requires fast performance. Within one of its inner loops, I need to test the type of an object to see whether it inherits from a certain interface. One way to do this would be with the CLR's built-in type-checking functionality. The most elegant method there probably being the 'is' keyword: if (obj is ISpecialTy...
I'm finding massive performance differences between similar code in C anc C#. The C code is: #include <stdio.h> #include <time.h> #include <math.h> main() { int i; double root; clock_t start = clock(); for (i = 0 ; i <= 100000000; i++){ root = sqrt(i); } printf("Time elapsed: %f\n", ((double)clock() - sta...
I would like to performance test a typical web application. The application offers some web2.0 functionalities, like writing blogs, wikis, search for contents and something like this. I've analysed the access log and got know an unterstanding what the users are doing really frequently. The gap in my brain is how to proceed? I thoght abo...
We have about 10K rows in a table. We want to have a form where we have a select drop down that contains distinct values of a given column in this table. We have an index on the column in question. To increase performance I created a little cache table that contains the distinct values so we didn't need to do a select distinct field...
How do I count the number of files in a directory using Java ? For simplicity, lets assume that the directory doesn't have any sub-directories. I know the standard method of : new File(<directory path>).listFiles().length But this will effectively go through all the files in the directory, which might take long if the number of files...