[Openmp-dev] Segmentation fault libomptarget.so
Talita Perciano via Openmp-dev
openmp-dev at lists.llvm.org
Wed Feb 13 13:50:02 PST 2019
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*
>> <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*
>> <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*
>> <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
>>
>>
>> _______________________________________________
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>> *Openmp-dev at lists.llvm.org* <Openmp-dev at lists.llvm.org>
>> *https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev*
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>>
>>
>>
>> --
>> 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* <tperciano at lbl.gov>
>> *http://tperciano.wixsite.com/home* <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* <tperciano at lbl.gov>
>> *http://tperciano.wixsite.com/home* <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
>
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