Charm++ parallel programming system

[Sam White <white67 AT illinois.edu>]

The [reductiontarget] entry method still needs to take a C-style array of N doubles as its argument or separate doubles, despite now being able to contribute a std::vector directly to the reduction. So it should like this:

    entry [reductiontarget] void minstat(int n, double min[n]);

or this:

    entry [reductiontarget] void minstat(double min1, double min2);


We'll update our documentation to make this clear.

-Sam

On Thu, May 3, 2018 at 2:31 PM, Jozsef Bakosi <jbakosi AT lanl.gov> wrote:

Hi folks,

I'm trying do a reduction on a std::vector:

std::vector< double > min{ 1.0, 1.0 };

contribute( min, CkReduction::min_double,
  CkCallback(CkReductionTarget(Target,minstat), target) );

with

chare Target {
  entry [reductiontarget] void minstat( std::vector< double > d );
}

class Target : public CBase_Target {
  public:
    void minstat( std::vector< double > d ) {
       ...
    }
}

However, I get:

161: ------------- Processor 0 Exiting: Called CmiAbort ------------
161: Reason: Unhandled C++ exception in user code.
161:
161: [0] Stack Traceback:
161:   [0:0] CmiAbortHelper+0xc1  [0x7fffe75ccfc1]
161:   [0:1] +0x7148  [0x7fffe75ca148]
161:   [0:2] +0x17cb88  [0x7fffe7d59b88]
161:   [0:3] +0x17cb69  [0x7fffe7d59b69]
161:   [0:4] +0x22763  [0x7fffe5536763]
161:   [0:5] +0x25516  [0x7fffe5539516]
161:   [0:6] +0x254af  [0x7fffe55394af]
161:   [0:7] std::__1::__vector_base_common<true>::__throw_length_error() const+0x44  [0x7fffe57e00a4]
161:   [0:8] std::__1::vector<double, std::__1::allocator<double> >::__append(unsigned long)+0x139  [0x5aaf59]
161:   [0:9] std::__1::vector<double, std::__1::allocator<double> >::resize(unsigned long)+0x7b  [0x5aa9db]
161:   [0:10] void PUP::operator|<double>(PUP::er&, std::__1::vector<double, std::__1::allocator<double> >&)+0x44  [0x5aa884]
161:   [0:11] _ZN3PUP6detailorINSt3__16vectorIdNS2_9allocatorIdEEEEEEvRNS_2erERNS0_21TemporaryObjectHolderIT_Xsr3std16is_constructibleINS_11reconstructESA_EE5valueEEE+0x1d  [0x5b204d]
161:   [0:12] inciter::CkIndex_Transporter::_call_redn_wrapper_minstat_marshall11(void*, void*)+0x80  [0x7ffff649d6f0]
161:   [0:13] CkDeliverMessageFree+0x41  [0x7fffe7d73b21]
161:   [0:14] +0x19763b  [0x7fffe7d7463b]
161:   [0:15] +0x19ecfb  [0x7fffe7d7bcfb]
161:   [0:16] +0x199496  [0x7fffe7d76496]
161:   [0:17] _processHandler(void*, CkCoreState*)+0x245  [0x7fffe7d75a85]
161:   [0:18] CmiHandleMessage+0x97  [0x7fffe735faa7]
161:   [0:19] CsdScheduleForever+0xc4  [0x7fffe735fdd4]
161:   [0:20] CsdScheduler+0x1a  [0x7fffe735fafa]
161:   [0:21] +0x9c91  [0x7fffe75ccc91]
161:   [0:22] ConverseInit+0x6c3  [0x7fffe75cc543]
161:   [0:23] main+0x45  [0x7fffe825e755]
161:   [0:24] __libc_start_main+0xe7  [0x7fffe4d45a87]
161:   [0:25]   [0x4bd00a]

I also tried with
  entry [reductiontarget] void minstat( const std::vector< double >& d );
and
    void minstat( const std::vector< double >& d ) {

yielding the same problem. Can someone enlighten me on how to reduce a
std::vector?

Thanks,
Jozsef