1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
|
/* Ergo, version 3.8.2, a program for linear scaling electronic structure
* calculations.
* Copyright (C) 2023 Elias Rudberg, Emanuel H. Rubensson, Pawel Salek,
* and Anastasia Kruchinina.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Primary academic reference:
* Ergo: An open-source program for linear-scaling electronic structure
* calculations,
* Elias Rudberg, Emanuel H. Rubensson, Pawel Salek, and Anastasia
* Kruchinina,
* SoftwareX 7, 107 (2018),
* <http://dx.doi.org/10.1016/j.softx.2018.03.005>
*
* For further information about Ergo, see <http://www.ergoscf.org>.
*/
/** @file Memory_buffer_thread.cc
\brief Code for managing aligned memory buffers, used if SSE
intrinsics enabled.
*/
#include "Memory_buffer_thread.h"
/* This file is only used if USE_SSE_INTRINSICS is defined. */
#ifdef USE_SSE_INTRINSICS
namespace mat{
// Initialization of static members
Memory_buffer_thread* Memory_buffer_thread::ptr_to_instance = 0;
volatile char Memory_buffer_thread::ptr_to_instance_is_valid = 0;
unsigned int Memory_buffer_thread::bufSize = 1000000;
void Memory_buffer_thread::create() {
static Memory_buffer_thread theInstance;
ptr_to_instance = &theInstance;
theInstance.init_buffers(1); // Default number of threads is 1.
}
Memory_buffer_thread& Memory_buffer_thread::instance() {
if (!ptr_to_instance_is_valid) {
#ifdef _OPENMP
#pragma omp critical (mem_buf_thr_instance)
#endif
{
if (!ptr_to_instance_is_valid) {
create();
ptr_to_instance_is_valid = 1;
}
}
}
return *ptr_to_instance;
}
void Memory_buffer_thread::init_buffers(unsigned int const nThreads) {
#ifdef _OPENMP
#pragma omp critical (mem_buf_thr_init_buffers)
#endif
{
// First delete buffers if they were allocated before
for (unsigned int ind = 0; ind < buffers.size(); ind++)
delete[] buffers[ind];
// Then resize
buffers.resize(nThreads);
for (unsigned int ind = 0; ind < buffers.size(); ind++)
buffers[ind] = new char[bufSize];
}
}
Memory_buffer_thread::~Memory_buffer_thread() {
for (unsigned int ind = 0; ind < buffers.size(); ind++)
delete[] buffers[ind];
}
} // end namespace mat
#endif
|
