The parallel-programming tag has no usage guidance.
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Parallel Image Processing Best Practices
When doing (possibly heavy) pixel processing on a large image, multithreading becomes a must. The standard practice is to initiate a loop whose indices are partitioned into multiple threads within a ...
3
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0answers
54 views
Get service data of future iterations
I have a doubt with threading data service calls within a foreach loop. Here it goes:
Say you need to request data from a service and then process that data, for this example, let's say data request ...
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vote
1answer
57 views
parallel programming memory usage
I am starting to learn parallel programming in c++, and I have a program like this:
for i = 1:N
do something time and memory intensive
end
If I program this in parallel, and my processors have ...
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3answers
73 views
Excute Procedure in Parallel or Async
I have inherited an application which performs approximately 100,000 executions in a C# for-loop against SQL Server.
for (int i=0; i<100000; i++)
{
//Execution can take 0.250 to 5 seconds to ...
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4answers
422 views
Best algorithm to multi-thread this application?
I define an algorithm to be best if it minimizes the total run time over commodity hardware (e.g. normal desktop and server PCs).
I have sets A and B. I also have function f that works like f(a, b, n)...
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votes
2answers
113 views
Designing an application with safe paralleled tasking
The title may have been a little vague... I am working on a piece of software that is designed to perform one task. I would like this task to work in parallel, allowing for multiple asynchronous ...
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0answers
43 views
OpenMPI: Speeding up process
I have a scenario where suppose I have 10 files, each with lots of values(~100,000) of co-ordinates (x,y,z). Now I use open MPI to create 10 processes ,each of which read from its assigned file and ...
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0answers
61 views
One producer and one consumer vs inconsistent shared resource state
I was reading about implementation of producer-consumer problem with one producer and one consumer. Looking at this paragraph I see the implementation where shared resource access is not synchronized ...
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votes
1answer
44 views
Grand Central Dispatch efficiency
Running a ray tracing program as a single thread on an iMac quad-core processor the CPU utilisation is 12%. OK so one of the Intel hyper-threads has been 100% allocated to the process. When GCD is ...
5
votes
1answer
181 views
Partially parallel producer-consumer pattern with internal state
I need to implement a producer-consumer pattern for reading, processing and saving electrical values. I have to implement this in C# .NET 4.6.1.
I try to describe this in great detail, so that there ...
1
vote
2answers
279 views
Is python list comprehension using multi-threading or parallelized in any way by default?
When I write...
l2 = [my_computation(x) for x in l]
..., I wonder if python is applying my_computation to every x using all cores of my CPU.
If not, why ?
Is there a simple way to make python ...
0
votes
1answer
87 views
Raspberry pi computer cluster question?
I am wanting to have/ or make a program that runs on a (raspberry pi)computer cluster with one pi executing only video content while the other only handles music, etc under a main program like an AI. ...
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0answers
60 views
can a parallel queue empty itself?
Is there a way to accomplish this pseudo-code in C# in .NET4.5?
parallelQueue.attemptDequeueFirstItem(item)
success -> ( doAsyncTask(item).Success(UpdateDatabase) )
...
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0answers
162 views
Is the logic behind `Asyncio.wait()` and async/await, the same, just the code is written differently (syntax)?
I'm learning Python, more specially parallel programming using Python Parallel Programming Cookbook by Giancarlo Zaccone.
At the time the book was published async/await was still in the beta version ...
32
votes
5answers
4k views
What is it about functional programming that makes it inherently adapted to parallel execution? [duplicate]
I've been reading over and over that functional languages are ideal (or at least very often useful) for parallelism. Why is this? What core concepts and paradigms are typically employed and which ...
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3answers
293 views
Executing scripts in parallel based on dependency tree
We have an app that is using a fairly simple stack (Linux, PHP, Oracle, Shell Scripts, etc).
We have a series of scripts that need to be executed:
/scr/app1/start.sh
/scr/app2/start.php
/scr/app3/...
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votes
10answers
3k views
Do algorithms depend on computer architectures?
I read somewhere (forgot which book it is) that algorithms are independent of computer architectures. Some even say algorithms are themselves computation (machines?)?
On the other hand, books on ...
5
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2answers
373 views
Why is the Jacobi method a good candidate algorithm to implement on a GPU?
I understand that GPU's has hundreds of cores that can handle thousands of threads all at once and that with the Jacobi iteration you're essentially using the same numbers over and over again to ...
3
votes
1answer
147 views
Does parallel mergesort run differently on mesh vs linear array of processors?
I'm currently taking course on introduction to algorithm and I came across the parallel mergesort algorithm.
My question is: Is there any differences in the algorithm plan if it runs on a 2d mesh ...
2
votes
0answers
100 views
Does OpenMp have support for Real Time Multiprocessor Computing?
I am working on a real time multiprocessor scheduling algorithm. I found very few results via google research related to it. A few simulators are available but are not robust enough.
OpenMp is an ...
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0answers
149 views
Whats the best way to parallel my problem using Java API
I´m with trouble, because I want to make faster my code using threads, fork in join or any kind of parallel.
I did a code using fork in join but I saw my arraylist isn´t getting the correct values.
...
-1
votes
1answer
698 views
Extracting data from log files
I will be extracting certain bits from log files using regular expressions to filter out bit of data. Initially I was going to do this with Python. I later started to think about the fastest way I can ...
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0answers
125 views
Report generator windows service polling database for work
I'm building a new report generator for our in-house survey system. (No I can not use any off-the-shelf software. These are highly customized reports.)
I want to use Topshelf to host the generator as ...
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0answers
62 views
Help in finding the total time taken by the entire production?
I have a line object and each line object has an array of tasks associated with it.Each task has a start time and an end time.Each task also has a list of tasks which are its predecessors.
So if all ...
4
votes
1answer
328 views
Help/suggestions for Parallel assembly line scheduling (Dynamic programming)
I am working on a problem similar to the assembly line scheduling by dynamic programming.The issue is that unlike the classic problem where we have predefined stations now I only have information ...
2
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3answers
774 views
Parallel.For Inconsistency results
I am using VB.net to write a parallel based code. I use Parallel.For to generate pairs of 500 objects or in combination C(500,2) such as the following code; but I found that it didn't always generate ...
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2answers
1k views
Memory allocation of Classes that don't have any global data and locks
static void Main(string[] args)
{
var c2 = new Class2();
var c3 = new Class3();
var c1 = new Class1(c2, c3);
c1.Method1();
}
class Class1
{
...
2
votes
6answers
426 views
Is an atomic action supposed to be deterministic?
I was reading about the at most once property that defines what an atomic action is and I've been curios about this example:
x = 0, y = 0
x = y + 1 || y = y + 1
If we use the 'at most once' ...
1
vote
0answers
403 views
Parallel Programing in C#
I have a code where I have to read some Binary files in database. I wrote a For loop that iterate over my file path array, then it call a READ function that read that file into database.
I run this ...
6
votes
1answer
731 views
Which parallel pattern to use?
I need to write a server application that fetches mails from different mail servers/mailboxes and then needs to process/analyze these mails.
Traditionally, I would do this multi-threaded, launching a ...
5
votes
1answer
452 views
How can I benchmark concurrent key-value stores?
I have some concurrent key-value store implementations that are implemented with hash tables and search trees that I would like to compare. I would like to benchmark them with a real world application ...
1
vote
2answers
407 views
Relation of CPU Hz's and network speed in clusters
In cluster the Amdahl's law, Gustafson's law exists.
I though that there might be some law which states the relation between CPU Hz's and network speed: maximum network speed after which no ...
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vote
1answer
1k views
Parallel computing using xcode
I'm making mandelbrot fractals in C using Xcode and I want to use parallel computing but everything I've tried so far doesn't work. Such as This Question and other how to guides. Whats the easiest way ...
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votes
1answer
242 views
Asynchronously returning a hierarchal data using .NET TPL… what should my return object “look” like?
I want to use the .NET TPL to asynchronously do a DIR /S and search each subdirectory on a hard drive, and want to search for a word in each file... what should my API look like?
In this scenario I ...
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votes
1answer
3k views
How to select an appropriate Nvidia GPU for learning CUDA [closed]
What would be a good GPU to start learning CUDA on?
Are any GPUs unsuitable?
6
votes
3answers
1k views
Cloud computing platforms only have one CPU. Does this mean I shouldn't use Parallel Programming?
Almost every cloud instance I can find only offers one CPU. Why is this only one CPU now, and should I expect this to increase in the future?
Does this design impact my code design so that I exclude ...
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8answers
841 views
When should I use parallelism? [closed]
After asking this question, I got to realize that parallelism may not always be good.
So far I can see that parallelism (under c#) is
A little complicated code-wise
Will probably insert some ...
57
votes
12answers
22k views
What kind of problems does MapReduce solve?
I have been reading about MapReduce for a while -- but what I can't understand is how someone would make a decision to use (or not use) MapReduce.
I mean, what are the problem patterns that signal ...
3
votes
2answers
818 views
Parallel computing and mobile computing
I have been working as software developer for past 4 years on a variety of software products (Financial ERP system, Online Web development, Trading software and now a Supply Chain mgmt software). Most ...
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2answers
6k views
Debug multiprocessing in Python
What are some good practices in debugging multiprocessing programs in Python?
8
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1answer
4k views
Parallel programming library? (+ some features)
Note: this is a reposting as the question has been considered non-suitable for the Stack Overflow forum and should have been posted here. The original topic is there.
I'd like to talk of ...
