Revision 2354889c8f9211eea120e48618a037986b4a5f45 authored by Clément Pernet on 17 March 2021, 10:40:10 UTC, committed by Clément Pernet on 17 March 2021, 10:40:10 UTC
fsytrf.C
/*
* Copyright (C) 2016 FFLAS-FFPACK group.
*
* Written by Clément Pernet <clement.pernet@imag.fr>
* Philippe LEDENT <philippe.ledent@etu.univ-grenoble-alpes.fr>
*
* ========LICENCE========
* This file is part of the library FFLAS-FFPACK.
*
* FFLAS-FFPACK is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* ========LICENCE========
*
*/
#include "fflas-ffpack/fflas-ffpack-config.h"
#include <iostream>
#include <givaro/modular-balanced.h>
#include "fflas-ffpack/utils/timer.h"
#include "fflas-ffpack/ffpack/ffpack.h"
#include "fflas-ffpack/utils/fflas_randommatrix.h"
#ifdef __GIVARO_USE_OPENMP
typedef Givaro::OMPTimer TTimer;
#else
typedef Givaro::Timer TTimer;
#endif
#include <ctime>
#define CUBE(x) ((x)*(x)*(x))
#define GFOPS(n,t) (CUBE(double(n)/1000.0)/(3.0*t))
int main () {
using namespace std;
typedef Givaro::ModularBalanced<double> Field;
Field F(131071);
size_t n=64, nmax=500, prec=64, nbest=0, count=0;
TTimer chrono,tim;
bool bound=false;
time_t result = std::time(NULL);
// Let A be a symmetric matrix
Field::Element_ptr A = FFLAS::fflas_new (F, nmax, nmax);
size_t lda = nmax;
typename Field::RandIter G(F);
FFPACK::RandomSymmetricMatrix (F, n, true,
A, lda,G);
// Let B be a copy of A
Field::Element_ptr B = FFLAS::fflas_new (F, nmax, nmax);
FFLAS::fassign (F, n, n, A, lda, B, lda);
cerr << std::endl
<< "---------------------------------------------------------------------"
<< std::endl << std::asctime(std::localtime(&result))
<< std::endl
<< "Threshold for fsytrf base case" ;
F.write(cerr << " (using ") << ')' << endl << endl;
cerr << "fsytrf: n Base case Recursive 1 level" << std::endl;
cerr << " seconds Gfops seconds Gfops" << std::endl;
double BCTime, RecTime;
int iter;
do{
iter=300;
//warm up computation
FFPACK::fsytrf(F,FFLAS::FflasUpper,n,B,lda,n);
FFLAS::fassign (F, n, n, A, lda, B, lda);
// base case
chrono.clear();tim.clear();
for (int i=0;i<iter;i++){
chrono.start();
FFPACK::fsytrf(F, FFLAS::FflasUpper, n, B, lda, n);
chrono.stop();
tim+=chrono;
FFLAS::fassign (F, n, n, A, lda, B, lda);
}
BCTime = tim.usertime()/iter;
tim.clear();chrono.clear();
for (int i=0;i<iter;i++){
chrono.start();
FFPACK::fsytrf(F, FFLAS::FflasUpper, n, B, lda, n-1);
chrono.stop();
tim+=chrono;
FFLAS::fassign (F, n, n, A, lda, B, lda);
}
RecTime = tim.realtime()/iter;
cerr << " ";
cerr.width(4);
cerr << n;
cerr << " ";
cerr.width(15);
cerr << BCTime;
cerr << " ";
cerr.width(15);
cerr << GFOPS(n, BCTime) << " ";
cerr.width(15);
cerr << RecTime;
cerr << " ";
cerr.width(15);
cerr << GFOPS(n, RecTime) << endl;
if (BCTime > RecTime){
count++;
if (count > 2){
nbest = n;
bound = true;
prec = prec >> 1;
n -= prec;
}
}
else{
count=0;
if (bound)
prec=prec>>1;
n+=prec;
}
} while ((prec > 1 ) && (n < nmax));
cerr<<endl;
if (nbest != 0 ) {
cout << "#ifndef __FFLASFFPACK_FSYTRF_THRESHOLD" << endl;
cout << "#define __FFLASFFPACK_FSYTRF_THRESHOLD" << ' ' << nbest << endl;
cerr << "defined __FFLASFFPACK_FSYTRF_THRESHOLD to " << nbest << "" << std::endl;
std::cout << "#endif" << endl << endl;
}
FFLAS::fflas_delete(A);
FFLAS::fflas_delete(B);
return 0;
}
/* -*- mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
// vim:sts=4:sw=4:ts=4:et:sr:cino=>s,f0,{0,g0,(0,\:0,t0,+0,=s
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