El 22/08/14 21:31, Saliya Ekanayake escribió:
My apologies, I think I wasn't clear on my question. My question was,
given that copying of data is necessary in both approaches (either by
the system with arrays or by programmer with buffers), is there a
foreseeable performance difference in term
Please find inline comments.
On Fri, Aug 22, 2014 at 3:45 PM, Rob Latham wrote:
>
>
> On 08/22/2014 02:40 PM, Saliya Ekanayake wrote:
>
>> Yes, these are all MPI_DOUBLE
>>
>
> well, yeah, but since you are talking about copying into a "direct buffer"
> there must be something tricker about the
On 08/22/2014 02:40 PM, Saliya Ekanayake wrote:
Yes, these are all MPI_DOUBLE
well, yeah, but since you are talking about copying into a "direct
buffer" there must be something tricker about the layout than just N*M
doubles.
sometimes people allocate 2d arrays by allocating one array of N
Yes, these are all MPI_DOUBLE
On Fri, Aug 22, 2014 at 3:38 PM, Rob Latham wrote:
>
>
> On 08/22/2014 10:10 AM, Saliya Ekanayake wrote:
>
>> Hi,
>>
>> I've a quick question about the usage of Java binding.
>>
>> Say there's a 2 dimensional double array (size m x n) that needs to be
>> sent to an
On 08/22/2014 10:10 AM, Saliya Ekanayake wrote:
Hi,
I've a quick question about the usage of Java binding.
Say there's a 2 dimensional double array (size m x n) that needs to be
sent to another rank. I see two options to get this done,
1. Copy values to a direct buffer of size m*n and send i
My apologies, I think I wasn't clear on my question. My question was, given
that copying of data is necessary in both approaches (either by the system
with arrays or by programmer with buffers), is there a foreseeable
performance difference in terms of performance considering the time it
takes for
El 22/08/14 20:44, Saliya Ekanayake escribió:
Thank you Oscar for the detailed information, but I'm still wondering
how would the copying in 2 would be different than what's done here
with copying to a buffer.
If you have a buffer array like this:
double buffer[] = new double[m * n];
Cop
Thank you Oscar for the detailed information, but I'm still wondering how
would the copying in 2 would be different than what's done here with
copying to a buffer.
On Fri, Aug 22, 2014 at 2:17 PM, Oscar Vega-Gisbert
wrote:
> El 22/08/14 17:10, Saliya Ekanayake escribió:
>
> Hi,
>>
>> I've a qu
El 22/08/14 17:10, Saliya Ekanayake escribió:
Hi,
I've a quick question about the usage of Java binding.
Say there's a 2 dimensional double array (size m x n) that needs to be
sent to another rank. I see two options to get this done,
1. Copy values to a direct buffer of size m*n and send it
Hi,
I've a quick question about the usage of Java binding.
Say there's a 2 dimensional double array (size m x n) that needs to be sent
to another rank. I see two options to get this done,
1. Copy values to a direct buffer of size m*n and send it
2. Copy values to a 1D array of size m*n and send
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