[Openmp-dev] Segmentation fault libomptarget.so
Kelvin Li via Openmp-dev
openmp-dev at lists.llvm.org
Wed Feb 13 14:18:09 PST 2019
Oops, sorry. It should be
$ gcc --version
gcc (GCC) 4.8.5 20150623 (Red Hat 4.8.5-11)
Kelvin
From: Kelvin Li/Toronto/IBM
To: Talita Perciano <TPerciano at lbl.gov>
Cc: Alexey Bataev <a.bataev at outlook.com>, "openmp-dev at lists.llvm.org"
<openmp-dev at lists.llvm.org>, Openmp-dev
<openmp-dev-bounces at lists.llvm.org>
Date: 2019/02/13 05:12 PM
Subject: Re: [Openmp-dev] Segmentation fault libomptarget.so
It is GCC 5.4.
$ gcc --version
gcc (Ubuntu/IBM 5.4.0-6ubuntu1~16.04.11) 5.4.0 20160609
Kelvin
From: Talita Perciano <TPerciano at lbl.gov>
To: Kelvin Li <kli at ca.ibm.com>
Cc: Alexey Bataev <a.bataev at outlook.com>, "openmp-dev at lists.llvm.org"
<openmp-dev at lists.llvm.org>, Openmp-dev
<openmp-dev-bounces at lists.llvm.org>
Date: 2019/02/13 05:10 PM
Subject: Re: [Openmp-dev] Segmentation fault libomptarget.so
Hi Kelvin,
I see... in my case I used the clang 7 I compiled to build the openmp
runtime. OS info:
Ubuntu
VERSION="16.04.5 LTS (Xenial Xerus)"
Kernel: 4.4.0-141-generic
I could try rebuilding the openmp runtime with gcc instead. Which gcc
version did you use?
Thanks,
Talita
On Wed, Feb 13, 2019 at 2:02 PM Kelvin Li <kli at ca.ibm.com> wrote:
I tried it with the 7.0 source as your described in the attachment. I did
not encounter the problem. The only difference in my openmp runtime build
is to use gcc on the system instead of clang. Which version of clang did
you use to build openmp runtime? Which OS is the build on?
I assume that you updated the example program based on Alexey's suggestion
and still get the seg fault.
Kelvin
From: Talita Perciano via Openmp-dev <openmp-dev at lists.llvm.org>
To: Alexey Bataev <a.bataev at outlook.com>
Cc: Openmp-dev <openmp-dev-bounces at lists.llvm.org>, "
openmp-dev at lists.llvm.org" <openmp-dev at lists.llvm.org>
Date: 2019/02/13 04:53 PM
Subject: Re: [Openmp-dev] Segmentation fault libomptarget.so
Sent by: "Openmp-dev" <openmp-dev-bounces at lists.llvm.org>
No worries! Thanks so much!
Talita
On Wed, Feb 13, 2019 at 1:51 PM Alexey Bataev <a.bataev at outlook.com>
wrote:
Hi Talita, had no time today, will look at it tomorrow, sorry.
Best regards,
Alexey Bataev
13 февр. 2019 г., в 16:50, Talita Perciano <TPerciano at lbl.gov> написал(а):
Hi,
Did any of you guys have the chance to take a look at this?
Thanks!
Talita
On Tue, Feb 12, 2019 at 2:18 PM Talita Perciano <TPerciano at lbl.gov> wrote:
Hi,
I'm attaching the cmake logs for both llvm and openmp.
Thanks,
Talita
On Tue, Feb 12, 2019 at 2:00 PM Alexey Bataev <a.bataev at outlook.com>
wrote:
Yes, seems to me something wrong either with the compiler, or the way it
is used. Need the compilation line, logs, error report.
Best regards,
Alexey Bataev
12 февр. 2019 г., в 16:58, Gheorghe-Teod Bercea <
Gheorghe-Teod.Bercea at ibm.com> написал(а):
This fixed it for me:
#pragma omp target map(tofrom: y[:n]) map(to:x[:n])
#pragma omp parallel for
for (int i = 0; i < n; i++)
y[i] += a * x[i];
--Doru
From: Talita Perciano via Openmp-dev <openmp-dev at lists.llvm.org>
To: Alexey Bataev <a.bataev at outlook.com>
Cc: "openmp-dev at lists.llvm.org" <openmp-dev at lists.llvm.org>
Date: 02/12/2019 04:45 PM
Subject: Re: [Openmp-dev] Segmentation fault libomptarget.so
Sent by: "Openmp-dev" <openmp-dev-bounces at lists.llvm.org>
Tried all the above... still segfault on my end. BTW, I don't know if
that's relevant but I'm using cuda 9.2.
On Tue, Feb 12, 2019 at 1:42 PM Alexey Bataev <a.bataev at outlook.com>
wrote:
Tried your example with my correction,
$./a.out 1000
Here
min = 0.000047, max = 0.999994, avg = 0.504811
$
-------------
Best regards,
Alexey Bataev
12.02.2019 16:38, Talita Perciano пишет:
Thanks for your quick response Alexey. I've just tried what you suggested
and I'm still getting the same error.
Best,
Talita
On Tue, Feb 12, 2019 at 1:36 PM Alexey Bataev <a.bataev at outlook.com>
wrote:
Try to modify target pragma this way
#pragma omp target map(from: x[:n]) map(tofrom:y[:n])
-------------
Best regards,
Alexey Bataev
12.02.2019 16:33, Talita Perciano via Openmp-dev пишет:
Hi,
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
https://www.hahnjo.de/blog/2018/10/08/clang-7.0-openmp-offloading-nvidia.html
.
Here is the piece of code I'm trying to run:
#include <malloc.h>
#include <stdio.h>
#include <stdlib.h>
int main(int argc, char* argv[])
{
if (argc != 2)
{
printf("Usage: %s \n", argv[0]);
return 0;
}
int n = atoi(argv[1]);
double* x = (double*)malloc(sizeof(double) * n);
double* y = (double*)malloc(sizeof(double) * n);
double idrandmax = 1.0 / RAND_MAX;
double a = idrandmax * rand();
for (int i = 0; i < n; i++)
{
x[i] = idrandmax * rand();
y[i] = idrandmax * rand();
}
printf("Here\n\n");
#pragma omp target
#pragma omp parallel for
{
for (int i = 0; i < n; i++)
y[i] += a * x[i];
}
double avg = 0.0, min = y[0], max = y[0];
for (int i = 0; i < n; i++)
{
avg += y[i];
if (y[i] > max) max = y[i];
if (y[i] < min) min = y[i];
}
printf("min = %f, max = %f, avg = %f\n", min, max, avg / n);
free(x);
free(y);
return 0;
}
I'm compiling the code like this: clang -fopenmp -fopenmp-targets=nvptx64
-O2 example.c
When I run I get a Segmentation fault immediately.
Any thoughts?
Thanks!
Talita
_______________________________________________
Openmp-dev mailing list
Openmp-dev at lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
--
Dr. Talita Perciano
Research Scientist - CRD, Lawrence Berkeley National Laboratory
Data Analytics & Visualization Group
Center for Advanced Mathematics for Energy Research Applications
One Cyclotron Road
Berkeley, CA 94720
059-3034B M/S 59R3103
Work: (510) 486-5060
tperciano at lbl.gov
http://tperciano.wixsite.com/home
--
Dr. Talita Perciano
Research Scientist - CRD, Lawrence Berkeley National Laboratory
Data Analytics & Visualization Group
Center for Advanced Mathematics for Energy Research Applications
One Cyclotron Road
Berkeley, CA 94720
059-3034B M/S 59R3103
Work: (510) 486-5060
tperciano at lbl.gov
http://tperciano.wixsite.com/home
_______________________________________________
Openmp-dev mailing list
Openmp-dev at lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
--
Dr. Talita Perciano
Research Scientist - CRD, Lawrence Berkeley National Laboratory
Data Analytics & Visualization Group
Center for Advanced Mathematics for Energy Research Applications
One Cyclotron Road
Berkeley, CA 94720
059-3034B M/S 59R3103
Work: (510) 486-5060
tperciano at lbl.gov
http://tperciano.wixsite.com/home
--
Dr. Talita Perciano
Research Scientist - CRD, Lawrence Berkeley National Laboratory
Data Analytics & Visualization Group
Center for Advanced Mathematics for Energy Research Applications
One Cyclotron Road
Berkeley, CA 94720
059-3034B M/S 59R3103
Work: (510) 486-5060
tperciano at lbl.gov
http://tperciano.wixsite.com/home
_______________________________________________
Openmp-dev mailing list
Openmp-dev at lists.llvm.org
https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev
--
Dr. Talita Perciano
Research Scientist - CRD, Lawrence Berkeley National Laboratory
Data Analytics & Visualization Group
Center for Advanced Mathematics for Energy Research Applications
One Cyclotron Road
Berkeley, CA 94720
059-3034B M/S 59R3103
Work: (510) 486-5060
tperciano at lbl.gov
http://tperciano.wixsite.com/home
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/openmp-dev/attachments/20190213/cb2b2d0b/attachment-0001.html>
More information about the Openmp-dev
mailing list