When I was learning Java coming from a background of some 20 years of procedural programming with basic, Pascal, COBOL and C, I thought at the time that the hardest thing about it was wrapping my head around the OOP jargon and concepts. Now with about 8 years of solid Java under my belt, I have come to the conclusion that the single har...
I am currently working on an MFC application that needs to be CPU-utilization aware. It may have multiple threads at different points in time, but the bulk of the work is accomplished by the main thread. I am trying to find a way to calculate how much percentage of the CPU this main thread utilizes. However, I am running into some prob...
I'm working on a program that processes many requests, none of them reaching more than 50% of CPU (currently I'm working on a dual core). So I created a thread for each request, the whole process is faster. Processing 9 requests, a single thread lasts 02min08s, while with 3 threads working simultaneously the time decreased to 01min37s, b...
I just watched the last Channel 9 vid on the upcoming parallel extensions to .NET. How would you use this in a web app? I'm specifically thinking of using the parallel Linq extensions against a SQL db. Would this makes sense to use as a way to speed up your data access layer in a multi-user server app? What are the issues (aside from the...
The question proper Has anyone experienced this exception on a single core machine? The I/O operation has been aborted because of either a thread exit or an application request. Some context On a single CPU system, only one MSIL instruction is executed at a time, threads notwithstanding. Between operations, the runtime gets to do...
I recently started diving into low level OS programming. I am (very slowly) currently working through two older books, XINU and Build Your Own 32 Bit OS, as well as some resources suggested by the fine SO folks in my previous question, How to get started in operating system development. It could just be that I haven't encountered it in ...
I have this application installed on my Macbook Pro that allows me to disable a core on my CPU. It got me wondering: How does disabling a core affect the running processes? I am also interested if disabling a core has an affect on the following Battery Life Heat generation Increased performance when the processor would normally be usi...
From the .net 4.0 previews I have read until now there has been lots of talk on how the next .net version will handle and use cpus with multiple cores. We will have additions like plinq that will help us make use of multiple cores. My question is why should I have to bother my mind with handling multiple cores when all I want is to make ...
Is there a benchmark that compares the different BLAS (Basic Linear Algebra Subprograms) libraries? I am especially interested in sparse matrix multiplication for single- and multi-core systems? ...
I understand how Map is easily parallelizable - each computer/CPU can just operate on a small portion of the array. Is Reduce/foldl parallelizable? It seems like each computation depends on the previous one. Is it just parallelizable for certain types of functions? ...
I was reading a review of the new Intel Atom 330, where they noted that Task Manager shows 4 cores - two physical cores, plus two more simulated by Hyperthreading. Suppose you have a program with two threads. Suppose also that these are the only threads doing any work on the PC, everything else is idle. What is the probability that the ...
I want to get into multi core programming (not language specific) and wondered what hardware could be recommended for exploring this field. My aim is to upgrade my existing desktop. ...
I'm trying to build about 600 projects some are .net 2.0, some are 3.5. I'm using Windows 2003 Enterprise Edition 32 bit with all the latest windows updates. Builds fine when maxcpucount is 1. If I bump it up to try and improve performance it get reference errors. When I look at the project references from where the error occurred it...
As someone in the world of HPC who came from the world of enterprise web development, I'm always curious to see how developers back in the "real world" are taking advantage of parallel computing. This is much more relevant now that all chips are going multicore, and it'll be even more relevant when there are thousands of cores on a chip...
Taking CPU affinity into account, will such an environment be useful with threading? Or will there be a performance degradation in such a system, if multiple users login and spawn multiple kernel and user threads? ...
So, I'm toying around with Stackless Python and a question popped up in my head, maybe this is "assumed" or "common" knowledge, but I couldn't find it actually written anywhere on the stackless site. Does Stackless Python take advantage of multicore CPUs? In normal Python you have the GIL being constantly present and to make (true) use ...
I have some questions about multi-threaded programming and multi-core usage. In particular I'm wondering how the operating system and/or framework (this is .NET) deals with cores that are heavily used. Here's my questions regarding threads: When a new thread is spawned, what is the algorithm for assigning the thread to a particular c...
Quick question: what is the compiler flag to allow g++ to spawn multiple instances of itself in order to compile large projects quicker (for example 4 source files at a time for a multi-core CPU)? Many thanks. ...
Hello, Is there anyone here with experience in the linux thread scheduler running multithreading applications in the new Quad core processors?. If there is someone like that can you please write here your experience about how is the performance of the kernel managing the different threads, Have you experienced any thread starving or the...
I'm doing some work on the input buffers for my kernel, and I had some questions. On Dual Core machines, I know that more than one "process" can be running simultaneously. What I don't know is how the OS and the individual programs work to protect collisions in data. There are two things I'd like to know on this topic: (1) Where do int...