Giovanni De Luca
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Question
When does it happens the data-copy, when executing a parallel job?
Hello, when I call a function that I want to run in parallel (for example, inside a _parfor_ statement), and this function re...
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
Parfor and data copy to workers
Hello, I read this brief explanation about when MATLAB does a copy of data when working with the PCT in http://www.mathwor...
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
When working with, e.g., two parallel processes, with the PCT, is the RAM memory partitioned in two?
Hi. Assuming I have a function _my_fnc_ with input parameters two very-large size matrices _A_ and _B_ , and a (column) vector _...
plus de 11 ans il y a | 1 réponse | 0
0
réponseQuestion
When calling the matlabpool to work in parallel, does each worker work in single-thread mode?
Hi, when I call a matlabpool of workers, and each worker has to compute a routine which is optimized by the BLAS subroutines (e....
plus de 11 ans il y a | 1 réponse | 0
1
réponseQuestion
Is there a command for the PCT which allows to know the communication time spent by the client to send data to the workers?
Hi, I would know if there is a command or a way to know exactly the time spent in communication, for an embarrassangly parall...
presque 12 ans il y a | 1 réponse | 0
0
réponseQuestion
How does the client send data to the workes, when calling parfor?
Hi, let assume I want to use the parfor with my function (in this case, it just computes the routine without retrieving data fro...
presque 12 ans il y a | 1 réponse | 0
1
réponseIf I call matlabpool open 4 and I have 4 cores, will I work in parallel with 4 or with 3 workers?
Thank you Thomas. Then, according to the first answer, if a call 4 workers the theoretical linear speedup I can obtain is 4, sin...
presque 12 ans il y a | 0
Question
If I call matlabpool open 4 and I have 4 cores, will I work in parallel with 4 or with 3 workers?
Hi, I have a desktop machine with 4 cores available. 1) I wonder whether, calling a pool of 4 workers with the PCT, there wil...
presque 12 ans il y a | 2 réponses | 0
2
réponsesQuestion
How to run a sequential code in a cluster workstation?
Hi, I have the opportunity to work with a cluster of computers in order to analyze the speed up, if any, of my parallelizable co...
environ 12 ans il y a | 1 réponse | 0
0
réponseQuestion
Why with running an intensive time-simulation routine in a local multi-core, with the parallel toolboxes, there is a slowdown respect to the sequential code, whilst with running the same code in a cluster workstation there is a speed up?
Hi, I implemented a code with a subroutine that is quite expensive in time simulation, the backslash operator in solving very l...
environ 12 ans il y a | 1 réponse | 0
0
réponse1) Why for dense matrices it's not useful to split B? 2) What are the factors that determine the speed up for the sparse case?
Thank you. The answer has been useful to understand the expensive cost of the factorization. Then, I've corrected my code: ...
plus de 12 ans il y a | 0
Question
1) Why for dense matrices it's not useful to split B? 2) What are the factors that determine the speed up for the sparse case?
I want to solve the linear system Ax=B for x, computing x=A\B, with B having m column-vector. This is one of the operations in m...
plus de 12 ans il y a | 2 réponses | 0
