Tagged Questions

a form of data processing in which multiple calculations are carried out simultaneously

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3 views

Does PETSc really give speedup?

I searched linear solver library and found out PETSc library which considered to be powerful and useful library. PETSc consists implementations of various iterative methods with preconditioners and ...
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1answer
12 views

Running same script with different input variables using batch command

I would like to run a script called 'myscript' using the batch command: j = batch('myscript') My script has a function in the beginning so: function myscript(input) ... end Is it somehow ...
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2answers
29 views

Calculating sum in parallel

This is an interview question. N nodes, each node consists of a couple fields and methods. These are: // Every node has an ID. All of these IDs are sequential, and begin with 0. // i.e. all ids ...
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1answer
11 views

How to estimate parallel potential of a sequential algorithm?

Given a sequential algorithm, Is there any tools to help me find what I could parallelize and what I could not (Data-flow analysis could be starting point maybe)? My main goal is to target OpenCL at ...
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0answers
16 views

How to use MPI with QT?

Im trying to create an image processing program where I only have one window with buttons and what not. I need to use MPI on the heavy processing functions, like Fourier Transform and High/Low pass. ...
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0answers
22 views

CUDA: tridiagonalization algorithm giving wrong results after a few iterations; see anything wrong? [closed]

I am trying to parallelize the tridiagonalization of a matrix from Numerical Recipes in C and comparing the answers (and eventually the computation speed) of different matrix sizes. I have run into a ...
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1answer
20 views

Multiple While loops working togther at once - MATLAB GUI

I developed a MATLAB GUI with multiple push buttons exist. Each push button begins an execution of an infinite loop. When I press a push button the while loop executes fine, but when I press the next ...
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0answers
5 views

At what rate almost the percentage of number of cores increases every year? Any good reference? [closed]

I need some good references to discuss perfectly about the prediction of increase in the number of cores within a chip? either CPU or GPU?
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15 views

Can't use more than 3 CPUs in IPython for parallel computing

I have a 8 cpu server running a iPython Notebook server in Linux Ubuntu 12.04.1. I'm trying to run a function in parallel asynchronously, using load balanced view, in a very similar way to the ...
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31 views

CUDA: sum-reduction — data lost in call to device function

I am writing a CUDA sum reduction code taking the sum of the absolute values of an array starting on element begin_index through end_index (I am using one block with a variable number of threads). ...
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0answers
14 views

Python quit unexpectedly running parallel processes with scipy.linalg.inv()

I try to run some tasks with multiprocessings Pool by Python. All seems to work as it should, but one line lets Python quit unexpectedly, it is the line, which computes the inverse of a matrix. ...
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1answer
113 views

Parallelizable Shell sort [closed]

How can I parallelize the following algorithm? private static void ShellSort(List<int> list) { int step = list.Count / 2; while (step > 0) { int i, j; ...
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28 views

Use MPI with parallel HDF5

Hi I am beginner in HDF5 and MPI and I tried during several days before to run parallel hdf5 with MPI .So I run it with GFS2 and PVFS2 but I faced different problems that I can not overcome. So can ...
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0answers
9 views

how can I parallelize a neuron network (ex: BP or Elman Network)? [closed]

I am trying to find a way to parallelize the training of a neuron network(BP or Elman Network), my goal is to distribute the training epochs to many processors and reduce the training time. But i ...
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2answers
40 views

Concurrent CPLEX processes a lot slower than single process

I am modelling and solving a linear program (LP) using single-threaded CPLEX with Java (under Linux). My aim is to solve multiple small LPs in parallel threads, ideally with each core independently ...

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