[Llvm-bgq-discuss] Node implementation of std::chrono::system_clock?
Hal Finkel
hfinkel at anl.gov
Wed May 18 12:45:40 CDT 2016
Hi Antonin,
Thanks for reporting. I'll look into this soon.
-Hal
----- Original Message -----
> From: "Antonin Portelli" <antonin.portelli at ed.ac.uk>
> To: llvm-bgq-discuss at lists.alcf.anl.gov
> Sent: Wednesday, May 18, 2016 10:54:07 AM
> Subject: [Llvm-bgq-discuss] Node implementation of std::chrono::system_clock?
>
> Dear bgclang maintainers,
>
> First let me thank you for making clang so easily available for BG/Q.
> I am struggling to run a code doing some timings using the C++11
> function std::chrono::system_clock::now(). If I run the code on a
> BG/Q node it throws a std::system_error exception with an empty
> message. I just wanted to if by any chance you were aware of this
> issue?
>
> I wrote the following minimal example to isolate the problem:
>
> #include <chrono>
> #include <iostream>
> #include <numeric>
> #include <vector>
>
> using namespace std;
>
> int main(void)
> {
> auto start = chrono::system_clock::now();
> std::vector<int> v(100000, 42);
> auto sink = std::accumulate(v.begin(), v.end(), 0u);
> auto end = chrono::system_clock::now();
> std::chrono::duration<double> diff = end-start;
> cout << diff.count() << endl;
>
> return 0;
> }
>
> It runs well when compiled for the frontend but crashes throwing
> std::system_error when compiled & run on a node, the backtrace is
> the following:
>
> 0 :Node (25)
> 1 : <traceback not fetched> (1)
> 1 : 0000000000000000 (24)
> 2 : .__libc_start_main (24)
> 3 : .generic_start_main (24)
> 4 : .main (24)
> 5 : .std::__1::chrono::system_clock::now() (24)
> 6 : .std::__1::__throw_system_error(int, char
> const*) (24)
> 7 : .__cxa_throw (24)
> 8 : .std::terminate() (24)
> 9 : .__cxxabiv1::__terminate(void
> (*)()) (24)
> 10:
> .__gnu_cxx::__verbose_terminate_handler()
> (24)
> 11: .abort (24)
>
> Best regards,
>
> Antonin Portelli
> --
> The University of Edinburgh is a charitable body, registered in
> Scotland, with registration number SC005336.
>
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>
--
Hal Finkel
Assistant Computational Scientist
Leadership Computing Facility
Argonne National Laboratory
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