we all writing code for single processor. i wonder when we all are able to write code on multi processors? what do we need (software tools, logic, algorithms) for this switching? edit: in my view, as we do many task parallely, same way we need to convert those real life solutions(algorithms) to computer lang. just as OOPs coding did fo...
I have to implement MPI system in a cluster. If anyone here has any experience with MPI (MPICH/OpenMPI), I'd like to know which is better and how the performance can be boosted on a cluster of x86_64 boxes. ...
The HttpRequestPool class provides a solution. Many thanks to those who pointed this out. A brief tutorial can be found at: http://www.phptutorial.info/?HttpRequestPool-construct Problem I'd like to make concurrent/parallel/simultaneous HTTP requests in PHP. I'd like to avoid consecutive requests as: a set of requests will take...
There's a lot of interest these days in Erlang as a language for writing parallel programs on multicore. I've heard people argue that Erlang's message-passing model is easier to program than the dominant shared-memory models such as threads. Conversely, in the high-performance computing community the dominant parallel programming model...
I have a neural network written in Erlang, and I just bought a GeForce GTX 260 card with a 240 core GPU on it. Is it trivial to use CUDA as glue to run this on the graphics card? ...
I've been writing a lot recently about Parallel computing and programming and I do notice that there are a lot of patterns that come up when it comes to parallel computing. Noting that Microsoft already has released a library along with the Microsoft Visual C++ 2010 Community Technical Preview (named Parallel Patterns Library) I'm wonder...
I want to do something like: exec sproc1 and sproc2 at the same time when they are both finished exec sproc3 I can do this in dts. Is there a way to do it in transact sql? Or is there a way to do it with a batch script (eg vbs or powershell)? ...
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...
Hi, In a project that I'm working, there's a table with a "on update" trigger, that monitors if a boolean column has changed (ex.: false -> true = do some action). But this action can only be done once for a row. There will be multiple clients accessing the database, so I can suppose that eventually, multiple clients will try to update...
I am sharding my data into multiple mysql databases, but sometimes I will need to gather information from multiple shards. How can I query multiple mysql databases in parallel in php? I've seen some examples of asynchronous curl requests and shell_exec, but is there a more direct way? ...
Well I can't decide if I should take the "Parallel Programming and Architectures" course, or the "Algorithms for Classification and Prediction" course ... so I figured I'd ask my very first StackOverFlow question ;) Really, I'm curious about parallel programming vs machine learning ... they're both very interesting areas. How much par...
I have the following code that I need to run over a matrix with over 20000 rows. It takes several minutes to run and the datenum and str2double functions appear to be the bottlenecks. Since no calculation depends on previous ones is there a way to break the loop into multiple parts and have them execute in parallel? Any advice on optimis...
My webapp will need to use multiple database shards, and occasionally need to query these shards in parallel. Are there any web scripting languages that have mature, stable support for parallel non blocking database access? If so, can you point me in the right direction? Free open source is preferred, but I mostly want something that ...
Hi, I am doing direct I/O on a parallel port which is fine and necessary for speed. I would like to enumerate the available ports to offer the user a choice of ports at setup time rather than a tedious trawl through device manager to read the address manually. Does anyone know a means of doing this please? Many thanks, Brian ...
I'd like to hear some opinions as to what role, if any, parallel computing approaches, including the potential use of the parallel extensions (June CTP for example), have a in web applications. What scenarios does this approach fit and/or not fit for? My understanding of how exactly IIS and web browsers thread tasks is fairly limited...
We build using MSBuild2005 with a self-written Logger class that keeps track of which projects are currently building and assigns the incoming errors/warnings to the projects. This was a kind of tricky because MSBuild also calls ProjectStarted/FinishedEventArgs when it "somehow" accesses referenced projects. But I got it working. Now we...
I need to handle direct I/O to a parallel port in a better way that we are doing it at the moment - presently we use a kernel driver that 'opens up' useable addresses using the I/O protection map. This works ok but is getting more and more left behind. We still wish to continue using a parallel port and there are very satisfactory parall...
I have a method that uses a connection (e.g. a method that downloads a page). I have to execute this method multiple times (e.g. download 1000 pages). Doing it the synchronous and sequential way takes a long time. I have limited resources ( 8 max threads and/or 50 max simultaneous connections ) I want to use all resources to accelerate ...
For example if I add four (blank) script tasks A1, A2, B1, and B2, where A2 has a constraint to run after A1 and B2 has a constraint to run after B1, but neither A1 nor B1 have constraints, then what order will the tasks run? When I try this it seems to do A1, then B1, then A2, then B2. But why? This question out of curiosity. Edited...
Is there a way to do foreach style iteration over parallel enumerables in C#? For subscriptable lists, I know one could use a regular for loop iterating an int over the index range, but I really prefer foreach to for for a number of reasons. Bonus points if it works in C# 2.0 ...