[Openmp-dev] Segmentation fault libomptarget.so
Talita Perciano via Openmp-dev
openmp-dev at lists.llvm.org
Wed Feb 13 14:09:41 PST 2019
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*
> <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*
> <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*
> <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*
> <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* <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*
> <openmp-dev at lists.llvm.org>>
> To: Alexey Bataev <*a.bataev at outlook.com* <a.bataev at outlook.com>>
> Cc: "*openmp-dev at lists.llvm.org* <openmp-dev at lists.llvm.org>" <
> *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*
> <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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>
>
> --
> 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
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> *https://lists.llvm.org/cgi-bin/mailman/listinfo/openmp-dev*
> <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* <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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