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Giovanni De Luca


Attivo dal 2013

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Professional Interests: Model Order Reduction

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Domanda


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...

quasi 11 anni fa | 1 risposta | 0

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Domanda


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...

quasi 11 anni fa | 0 risposte | 0

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Domanda


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 _...

quasi 11 anni fa | 0 risposte | 0

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Domanda


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....

circa 11 anni fa | 1 risposta | 0

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Domanda


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...

circa 11 anni fa | 0 risposte | 0

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Domanda


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...

oltre 11 anni fa | 1 risposta | 0

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Risposto
If 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...

oltre 11 anni fa | 0

Domanda


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...

oltre 11 anni fa | 2 risposte | 0

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Domanda


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...

oltre 11 anni fa | 0 risposte | 0

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Domanda


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...

oltre 11 anni fa | 0 risposte | 0

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Risposto
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?
Thank you. The answer has been useful to understand the expensive cost of the factorization. Then, I've corrected my code: ...

oltre 11 anni fa | 0

Domanda


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...

oltre 11 anni fa | 2 risposte | 0

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