Computación en paralelo

Dynamic Languages take over the internet

What would happen if you were hauling a trailer down the road, and suddenly you realized that the trailer you thought you were pulling passes you on the highway. (Which I guess can actually happen, I just saw a video capture of this exact disaster, happening to a trucker). You might not feel kind of blind-sided!

This is kind of the way I feel when a technology trend sneaks up on me and suddenly I feel like I'm way behind the curve.

How to set a 'rec' structuring element in ippiMorphCloseBorder_8u_C1R

Hello,

I am using IPP 9.0 Intel 64 to try to reducing processing time in a morphology closing operation on a 2048x2048 image.  I have used perfsys and am seeing a significant reduction in the processing time when Parm5 is 'rec'.  I'm assuming that this is a rectangular structure element, which is what I'm using. 

function
Parm1
Parm2
Parm3
Parm4
Parm5
Parm6
Parm7
Parm8
Comment
Clocks
per
Time (usec)

Accounting for CYCLE_ACTIVITY.CYCLES_NO_EXECUTE

Hi all,

I am using Vtunes' bandwidth profile to look at the fraction of time my software is waiting on any cache accesses on my HSW i7 processor. The CYCLE_ACTIVITY.CYCLES_NO_EXECUTE gives this time. When I try to break this down into fraction of time waiting on L1, L2, and L3+Mem, I am trying to use CYCLE_ACTIVITY.STALLS_L1D_PENDING, ...STALLS_L2_PENDING, and STALLS_LDM_PENDING. However, the sum of these three counts is > the CYCLES_NO_EXECUTE count always.

Odd dgesv results

Hello,

I'm trying to refactor a piece of code that solves a simple Ax=b linear problem using MKL. From the manual, I saw that dgesv is the function I should call.

A is an n-by-n Jacobian matrix (with just 5 non-zero diagonals), while b and x are arrays of size n.

To solve the problem I use this snippet of code

iconv issue

hi all,

 

I'm trying to build something for the Phi that depends on iconv; the library routines are present , but the following application fails when run on the Phi:

#include <stdlib.h>
#include <iconv.h>

int main () {
  iconv_t cd;
  cd = iconv_open("latin1","UTF-8");
  if(cd == (iconv_t)(-1)) exit(1);
  iconv_close(cd);

  exit(0);
}

if I build this using "icc -o iconv_test iconv_test.c" and run it on the host it return no error (exit code 0).

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