I'd be very grateful if you could compare the winning O’Rourke's Perl solution to Lundh's Python solution, as I don't know Perl good enough to understand what's going on there. More specifically I'd like to know what gave Perl version 3x advantage: algorithmic superiority, quality of C extensions, other factors? Wide Finder: Results ...
I am wondering what is the key thing that helps you in GPGPU development and of course what is the constraints that you find unacceptable. Comes to mind for me: Key advantage: the raw power of these things Key constraint: the memory model What's your view? ...
This question is related to another: http://stackoverflow.com/questions/108445/will-having-multiple-filegroups-help-speed-up-my-database The software we're developing is an analytical tool that uses MS SQL Server 2005 to store relational data. Initial analysis can be slow (since we're processing millions or billions of rows of data), b...
I have a need to find the best library to compress in memory data. I am currently using zlib but I am wondering if there is a better compression library; better in terms of performance and memory footprint. It should be able to handle multiple files in the same archive. I am looking for a C/C++ library. Performance is the key factor. ...
I've recently began using dTrace and have noticed just how awesome it is. Its the perfect tool for profiling without placing the burden on programmers to set up hundreds of probes in their applications. I've found some nice one liner and sample scripts here and there, but I was wondering about what scripts, tools and links others might ...
UI Virtualization is an awkward terminology that describes WPF UI controls that load and and dispose child elements on demand (based on their visibility) to reduce memory footprint. ListBox and ListView use a class called VirtualizingStackPanel by default to achieve higher performance. I found this control, which is really helpful, a v...
In our application (a game), in some cases it can't run fast enough. Obviously we'd like to speed it up, but in the mean-time when this happens it causes many problems (or if it's not causing them, the two are related). The one which is least related to our own functionality is that the built in Alert.show() method stops working. Typical...
In our game project we did have a timer loop set to fire about 20 times a second (the same as the application framerate). We use this to move some sprites around. I'm wondering if this could cause problems and we should instead do our updates using an EnterFrame event handler? I get the impression that having a timer loop run faster than...
Our application takes significantly more time to launch after a reboot (cold start) than if it was already opened once (warm start). Most (if not all) the difference seems to come from loading DLLs, when the DLLs' are in cached memory pages they load much faster. We tried using ClearMem to simulate rebooting (since its much less time c...
Are there any up-to-date performance comparisons of current PDAs available online? Or comparisons of the different available CPUs? I want to buy the right PDA for developing CPU-intensive C# graphics apps (in my spare time). So far I've found: Futuremark's handheld benchmarks don't aggregate results online SpbBenchmark only has result...
My project is currently using a svn repository which gains several hundred new revisions per day. The repository resides on a Win2k3-server and is served through Apache/mod_dav_svn. I now fear that over time the performance will degrade due to too many revisions. Is this fear reasonable? We are already planning to upgrade to 1.5, so h...
Is there any way to launch a program with a shortcut, that sets the process-priority of that program? iTunes is dragging my system to it's knees, but when I set the process-priority to "low", somehow, like magic, Windows gets back to it's normal responsive self :) ...
I have a real-time embedded app with the major cycle running at 10KHz. It runs on a TI TMS320C configured to boot from flash. I recently added an initialized array to a source file, and all of a sudden the timing is screwed up (in a way too complex to explain well - essentially a serial port write is no longer completing on time.) T...
At work, we are trying to combat the monstrosity that our application servers have become - we are now running out of server resources after many months of resource-creep. I would like to begin the process of finding out what to investigate by seeing what people think the best server monitoring tools are. Specifically, I'm interested...
Does a hash shrink in Perl as you delete elements. More specifically I had a perl program that I inherited that would parse a huge file ( 1 GB ) and load up a hash of hashes. it would do that same for another file and then do a comparison of different elements. The memory consumption was huge during this process and even though I added...
We use oracle as the back-end database for our product. I have been running series of stress tests on our system and I have started noticing that oracle is much faster right after the database was restarted. Over time (a couple hours or so) the database seems to get slower and slower and I will see the database machine under more stress....
What's the performance penalty on defining classes in an aspx/ascx codebehind rather than compiling them into a dll beforehand? I know that this isn't a best practice and that there are numerous problems with this (e.g. difficult to unit test, code is not reusable, etc.), but it does come in very handy when you're dealing with classes t...
What are the technologies and programming decisions that make Google able to serve a query so fast? Every time I search something (one of the several times per day) it always amazes me how they serve the results in near or less than 1 second time. What sort of configuration and algorithms could they have in place that accomplishes this...
I usually use C++ STL map whenever I need to store some data associated with a specific type of value (a key value - e.g. a string or other object). The STL map implementation is based on trees which provides better performance (O(log n)) than the standard array or STL vector. My questions is, do you know of any C++ "standard" hashtable...
I'd like to find a way to determine how long each function in PHP, and each file in PHP is taking to run. I've got an old legacy PHP application that I'm trying to find the "rough spots" in and so I'd like to locate which routines and pages are taking a very long time to load, objectively. Are there any pre-made tools that allow for t...