<div dir="ltr">Thanks for your quick response Alexey. I've just tried what you suggested and I'm still getting the same error.<div><br></div><div>Best,</div><div>Talita</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Feb 12, 2019 at 1:36 PM Alexey Bataev <<a href="mailto:a.bataev@outlook.com">a.bataev@outlook.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div bgcolor="#FFFFFF">
<p>Try to modify target pragma this way</p>
<p>#pragma omp target map(from: x[:n]) map(tofrom:y[:n])<br>
</p>
<pre class="gmail-m_-6981945557511111666moz-signature" cols="72">-------------
Best regards,
Alexey Bataev</pre>
<div class="gmail-m_-6981945557511111666moz-cite-prefix">12.02.2019 16:33, Talita Perciano via
Openmp-dev пишет:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div dir="ltr">
<div dir="ltr">Hi,
<div><br>
</div>
<div>I'm trying openmp offloading to gpu and I'm getting a
segfault when trying to run a test code. I followed the
instructions explained here <a href="https://www.hahnjo.de/blog/2018/10/08/clang-7.0-openmp-offloading-nvidia.html" target="_blank">https://www.hahnjo.de/blog/2018/10/08/clang-7.0-openmp-offloading-nvidia.html</a>.</div>
<div><br>
</div>
<div>Here is the piece of code I'm trying to run:</div>
<div><br>
</div>
<div>
<div>#include <malloc.h></div>
<div>#include <stdio.h></div>
<div>#include <stdlib.h></div>
<div> </div>
<div>int main(int argc, char* argv[])</div>
<div>{</div>
<div> if (argc != 2)</div>
<div> {</div>
<div> printf("Usage: %s \n", argv[0]);</div>
<div> return 0;</div>
<div> }</div>
<div> </div>
<div> int n = atoi(argv[1]);</div>
<div> </div>
<div> double* x = (double*)malloc(sizeof(double) * n);</div>
<div> double* y = (double*)malloc(sizeof(double) * n);</div>
<div> </div>
<div> double idrandmax = 1.0 / RAND_MAX;</div>
<div> double a = idrandmax * rand();</div>
<div> for (int i = 0; i < n; i++)</div>
<div> {</div>
<div> x[i] = idrandmax * rand();</div>
<div> y[i] = idrandmax * rand();</div>
<div> }</div>
<div> printf("Here\n\n");</div>
<div> #pragma omp target</div>
<div> #pragma omp parallel for</div>
<div> {</div>
<div> for (int i = 0; i < n; i++)</div>
<div> y[i] += a * x[i];</div>
<div> }</div>
<div> </div>
<div> double avg = 0.0, min = y[0], max = y[0];</div>
<div> for (int i = 0; i < n; i++)</div>
<div> {</div>
<div> avg += y[i];</div>
<div> if (y[i] > max) max = y[i];</div>
<div> if (y[i] < min) min = y[i];</div>
<div> }</div>
<div> </div>
<div> printf("min = %f, max = %f, avg = %f\n", min,
max, avg / n);</div>
<div> </div>
<div> free(x);</div>
<div> free(y);</div>
<div> </div>
<div> return 0;</div>
<div>}</div>
</div>
<div><br>
</div>
<div>I'm compiling the code like this: <span style="color:rgb(0,0,0)">clang </span><span class="gmail-m_-6981945557511111666gmail-nt" style="color:rgb(0,0,0)">-fopenmp</span><span style="color:rgb(0,0,0)"> </span><span class="gmail-m_-6981945557511111666gmail-nt" style="color:rgb(0,0,0)">-fopenmp-targets</span><span class="gmail-m_-6981945557511111666gmail-o" style="color:rgb(0,0,0)">=</span><span style="color:rgb(0,0,0)">nvptx64 </span><span class="gmail-m_-6981945557511111666gmail-nt" style="color:rgb(0,0,0)">-O2</span><span style="color:rgb(0,0,0)"> example.c</span></div>
<div><span style="color:rgb(0,0,0)">When I run I get a
Segmentation fault immediately.</span></div>
<div><span style="color:rgb(0,0,0)"><br>
</span></div>
<div><span style="color:rgb(0,0,0)">Any thoughts?</span></div>
<div><span style="color:rgb(0,0,0)"><br>
</span></div>
<div><span style="color:rgb(0,0,0)">Thanks!</span></div>
<div><span style="color:rgb(0,0,0)">Talita</span></div>
<div><br>
</div>
</div>
</div>
</div>
<br>
<fieldset class="gmail-m_-6981945557511111666mimeAttachmentHeader"></fieldset>
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</pre>
</blockquote>
</div>
</blockquote></div><br clear="all"><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div dir="ltr">Dr. Talita Perciano</div><div dir="ltr">Research Scientist - CRD, Lawrence Berkeley National Laboratory<br>Data Analytics & Visualization Group<br><div><font size="2">Center for Advanced Mathematics for Energy Research Applications</font></div><div><span style="font-size:12.8px">One Cyclotron Road</span><br style="font-size:12.8px"><span style="font-size:12.8px">Berkeley, CA 94720</span><span style="font-size:small"><br></span></div><div><span style="font-size:small">059-3034B </span><span style="font-size:13px;color:rgb(30,30,30);font-family:"Open Sans",sans-serif">M/S 59R3103</span><font size="2"><br></font></div></div><div dir="ltr">Work: (510) 486-5060<br></div><div><a href="mailto:tperciano@lbl.gov" target="_blank">tperciano@lbl.gov</a></div><div><a href="http://tperciano.wixsite.com/home" target="_blank">http://tperciano.wixsite.com/home</a><br></div></div></div></div></div></div></div></div></div>