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Options to use mersenne twister OR ranlux48 via --enable-rng flag at configure time.

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Can save and restore RNG state via new (serial) I/O routines in a NERSC header style file.
Store a Parallel (one per site) and a single serial RNG file.
This commit is contained in:
paboyle
2015-12-19 18:32:25 +00:00
parent e108e708a3
commit 5710966324
8 changed files with 331 additions and 22 deletions
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40
lib/lattice/Lattice_rng.h
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@@ -81,11 +81,39 @@ namespace Grid {
int _seeded;
// One generator per site.
// Uniform and Gaussian distributions from these generators.
std::vector<std::ranlux48> _generators;
#ifdef RNG_RANLUX
typedef uint64_t RngStateType;
typedef std::ranlux48 RngEngine;
static const int RngStateCount = 15;
#else
typedef std::mt19937 RngEngine;
typedef uint32_t RngStateType;
static const int RngStateCount = std::mt19937::state_size;
#endif
std::vector<RngEngine> _generators;
std::uniform_real_distribution<double> _uniform;
std::normal_distribution<double> _gaussian;
void GetState(std::vector<RngStateType> & saved,int gen) {
saved.resize(RngStateCount);
std::stringstream ss;
// std::cout << _generators[gen]<<std::endl;
ss<<_generators[gen];
ss.seekg(0,ss.beg);
for(int i=0;i<RngStateCount;i++){
ss>>saved[i];
}
}
void SetState(std::vector<RngStateType> & saved,int gen){
assert(saved.size()==RngStateCount);
std::stringstream ss;
for(int i=0;i<RngStateCount;i++){
ss<< saved[i]<<" ";
}
ss.seekg(0,ss.beg);
ss>>_generators[gen];
// std::cout << _generators[gen]<<std::endl;
}
};
class GridSerialRNG : public GridRNGbase {
@@ -98,7 +126,7 @@ namespace Grid {
{
typename source::result_type init = src();
CartesianCommunicator::BroadcastWorld(0,(void *)&init,sizeof(init));
_generators[0] = std::ranlux48(init);
_generators[0] = RngEngine(init);
_seeded=1;
}
@@ -185,8 +213,6 @@ namespace Grid {
class GridParallelRNG : public GridRNGbase {
public:
// One generator per site.
std::vector<std::ranlux48> _generators;
// Uniform and Gaussian distributions from these generators.
std::uniform_real_distribution<double> _uniform;
@@ -220,7 +246,7 @@ namespace Grid {
int gsites = _grid->_gsites;
typename source::result_type init = src();
std::ranlux48 pseeder(init);
RngEngine pseeder(init);
std::uniform_int_distribution<uint64_t> ui;
for(int gidx=0;gidx<gsites;gidx++){
@@ -241,7 +267,7 @@ namespace Grid {
if( rank == _grid->ThisRank() ){
fixedSeed ssrc(site_seeds);
typename source::result_type sinit = ssrc();
_generators[l_idx] = std::ranlux48(sinit);
_generators[l_idx] = RngEngine(sinit);
}
}
_seeded=1;