[Llvm-bgq-discuss] Node implementation of std::chrono::system_clock?

[Antonin Portelli]

Dear Hal,

I have run my minimal example with r270049-20160519 and I can confirm that now it outputs correctly the timings. Thank you very much for correcting that so quickly.

Best,

Antonin

> On 19 May 2016, at 14:44, Hal Finkel <hfinkel at anl.gov> wrote:
> 
> Hi Antonin,
> 
> This is fixed in the latest nightly build (r270049-20160519), and I'll pull the change into the next stable patch release 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.
>> 
>> _______________________________________________
>> llvm-bgq-discuss mailing list
>> llvm-bgq-discuss at lists.alcf.anl.gov
>> https://lists.alcf.anl.gov/mailman/listinfo/llvm-bgq-discuss
>> 
> 
> -- 
> Hal Finkel
> Assistant Computational Scientist
> Leadership Computing Facility
> Argonne National Laboratory
> 


-- 
The University of Edinburgh is a charitable body, registered in
Scotland, with registration number SC005336.