Page Menu
Home
c4science
Search
Configure Global Search
Log In
Files
F77855726
Kokkos_ClockTic.hpp
No One
Temporary
Actions
Download File
Edit File
Delete File
View Transforms
Subscribe
Mute Notifications
Award Token
Subscribers
None
File Metadata
Details
File Info
Storage
Attached
Created
Fri, Aug 16, 20:01
Size
3 KB
Mime Type
text/x-c
Expires
Sun, Aug 18, 20:01 (1 d, 21 h)
Engine
blob
Format
Raw Data
Handle
19934014
Attached To
rLAMMPS lammps
Kokkos_ClockTic.hpp
View Options
/*
//@HEADER
// ************************************************************************
//
// Kokkos v. 2.0
// Copyright (2014) Sandia Corporation
//
// Under the terms of Contract DE-AC04-94AL85000 with Sandia Corporation,
// the U.S. Government retains certain rights in this software.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// 1. Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
//
// 2. Redistributions in binary form must reproduce the above copyright
// notice, this list of conditions and the following disclaimer in the
// documentation and/or other materials provided with the distribution.
//
// 3. Neither the name of the Corporation nor the names of the
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY SANDIA CORPORATION "AS IS" AND ANY
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
// PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL SANDIA CORPORATION OR THE
// CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
// EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
// PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
// NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
// SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
//
// Questions? Contact H. Carter Edwards (hcedwar@sandia.gov)
//
// ************************************************************************
//@HEADER
*/
#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
Event Timeline
Log In to Comment