/usr/include/trilinos/impl/Kokkos_ClockTic.hpp is in libtrilinos-kokkos-dev 12.12.1-5.
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// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
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#ifndef KOKKOS_CLOCKTIC_HPP
#define KOKKOS_CLOCKTIC_HPP
#include <Kokkos_Macros.hpp>
#include <stdint.h>
#include <chrono>
namespace Kokkos {
namespace Impl {
/**\brief Quick query of clock register tics
*
* Primary use case is to, with low overhead,
* obtain a integral value that consistently varies
* across concurrent threads of execution within
* a parallel algorithm.
* This value is often used to "randomly" seed an
* attempt to acquire an indexed resource (e.g., bit)
* from an array of resources (e.g., bitset) such that
* concurrent threads will have high likelihood of
* having different index-seed values.
*/
KOKKOS_FORCEINLINE_FUNCTION
uint64_t clock_tic(void) noexcept
{
#if defined( __CUDA_ARCH__ )
// Return value of 64-bit hi-res clock register.
return clock64();
#elif defined( __i386__ ) || defined( __x86_64 )
// Return value of 64-bit hi-res clock register.
unsigned a = 0, d = 0;
__asm__ volatile( "rdtsc" : "=a" (a), "=d" (d) );
return ( (uint64_t) a ) | ( ( (uint64_t) d ) << 32 );
#elif defined( __powerpc ) || defined( __powerpc__ ) || \
defined( __powerpc64__ ) || defined( __POWERPC__ ) || \
defined( __ppc__ ) || defined( __ppc64__ )
unsigned int cycles = 0;
asm volatile( "mftb %0" : "=r" (cycles) );
return (uint64_t) cycles;
#else
return (uint64_t)
std::chrono::high_resolution_clock::now().time_since_epoch().count();
#endif
}
} // namespace Impl
} // namespace Kokkos
#endif // KOKKOS_CLOCKTIC_HPP
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