Centre Blaise Pascal » Bench4GPU

#!/usr/bin/env python

#

# Ising2D model in serial mode

#

# CC BY-NC-SA 2011 : <emmanuel.quemener@ens-lyon.fr> 

import sys

import numpy

import math

from PIL import Image

from math import exp

from random import random

import time

import getopt

import matplotlib.pyplot as plt

from numpy.random import randint as nprnd

KERNEL_CODE_OPENCL="""

// Marsaglia RNG very simple implementation

#define znew  ((z=36969*(z&65535)+(z>>16))<<16)

#define wnew  ((w=18000*(w&65535)+(w>>16))&65535)

#define MWC   (znew+wnew)

#define SHR3  (jsr=(jsr=(jsr=jsr^(jsr<<17))^(jsr>>13))^(jsr<<5))

#define CONG  (jcong=69069*jcong+1234567)

#define KISS  ((MWC^CONG)+SHR3)

#define MWCfp MWC * 2.328306435454494e-10f

#define KISSfp KISS * 2.328306435454494e-10f

__kernel void MainLoopOne(__global char *s,float T,float J,float B,

                          uint sizex,uint sizey,

                          uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z;

   uint w=seed_w;

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*y];

      int d=s[x+sizex*((y+1)%sizey)];

      int u=s[x+sizex*((y-1)%sizey)];

      int l=s[((x-1)%sizex)+sizex*y];

      int r=s[((x+1)%sizex)+sizex*y];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/T))) ? -1:1;

      s[x%sizex+sizex*(y%sizey)] = (char)factor*p;

   }

   barrier(CLK_GLOBAL_MEM_FENCE);      

}

__kernel void MainLoopGlobal(__global char *s,__global float *T,float J,float B,

                             uint sizex,uint sizey,

                             uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(get_global_id(0)+1);

   uint w=seed_w/(get_global_id(0)+1);

   float t=T[get_global_id(0)];

   uint ind=get_global_id(0);

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   barrier(CLK_GLOBAL_MEM_FENCE);

}

__kernel void MainLoopHybrid(__global char *s,__global float *T,float J,float B,

                             uint sizex,uint sizey,

                             uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(get_group_id(0)*get_num_groups(0)+get_local_id(0)+1);

   uint w=seed_w/(get_group_id(0)*get_num_groups(0)+get_local_id(0)+1);

   float t=T[get_group_id(0)*get_num_groups(0)+get_local_id(0)];

   uint ind=get_group_id(0)*get_num_groups(0)+get_local_id(0);

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   barrier(CLK_GLOBAL_MEM_FENCE);

}

__kernel void MainLoopLocal(__global char *s,__global float *T,float J,float B,

                            uint sizex,uint sizey,

                            uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(get_local_id(0)+1);

   uint w=seed_w/(get_local_id(0)+1);

   float t=T[get_local_id(0)];

   uint ind=get_local_id(0);

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   barrier(CLK_LOCAL_MEM_FENCE);

   barrier(CLK_GLOBAL_MEM_FENCE);

}

"""

KERNEL_CODE_CUDA="""

// Marsaglia RNG very simple implementation

#define znew  ((z=36969*(z&65535)+(z>>16))<<16)

#define wnew  ((w=18000*(w&65535)+(w>>16))&65535)

#define MWC   (znew+wnew)

#define SHR3  (jsr=(jsr=(jsr=jsr^(jsr<<17))^(jsr>>13))^(jsr<<5))

#define CONG  (jcong=69069*jcong+1234567)

#define KISS  ((MWC^CONG)+SHR3)

#define MWCfp MWC * 2.328306435454494e-10f

#define KISSfp KISS * 2.328306435454494e-10f

__global__ void MainLoopOne(char *s,float T,float J,float B,

                            uint sizex,uint sizey,

                            uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z;

   uint w=seed_w;

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*y];

      int d=s[x+sizex*((y+1)%sizey)];

      int u=s[x+sizex*((y-1)%sizey)];

      int l=s[((x-1)%sizex)+sizex*y];

      int r=s[((x+1)%sizex)+sizex*y];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/T))) ? -1:1;

      s[x%sizex+sizex*(y%sizey)] = (char)factor*p;

   }

   __syncthreads();

}

__global__ void MainLoopGlobal(char *s,float *T,float J,float B,

                               uint sizex,uint sizey,

                               uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(blockIdx.x+1);

   uint w=seed_w/(blockIdx.x+1);

   float t=T[blockIdx.x];

   uint ind=blockIdx.x;

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   __syncthreads();

}

__global__ void MainLoopHybrid(char *s,float *T,float J,float B,

                               uint sizex,uint sizey,

                               uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(blockDim.x*blockIdx.x+threadIdx.x+1);

   uint w=seed_w/(blockDim.x*blockIdx.x+threadIdx.x+1);

   float t=T[blockDim.x*blockIdx.x+threadIdx.x];

   uint ind=blockDim.x*blockIdx.x+threadIdx.x;

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   __syncthreads();

}

__global__ void MainLoopLocal(char *s,float *T,float J,float B,

                              uint sizex,uint sizey,

                              uint iterations,uint seed_w,uint seed_z)

{

   uint z=seed_z/(threadIdx.x+1);

   uint w=seed_w/(threadIdx.x+1);

   float t=T[threadIdx.x];

   uint ind=threadIdx.x;

   for (uint i=0;i<iterations;i++) {

      uint x=(uint)(MWC%sizex) ;

      uint y=(uint)(MWC%sizey) ;

      int p=s[x+sizex*(y+sizey*ind)];

      int d=s[x+sizex*((y+1)%sizey+sizey*ind)];

      int u=s[x+sizex*((y-1)%sizey+sizey*ind)];

      int l=s[((x-1)%sizex)+sizex*(y+sizey*ind)];

      int r=s[((x+1)%sizex)+sizex*(y+sizey*ind)];

      float DeltaE=2.0f*p*(J*(u+d+l+r)+B);

      int factor=((DeltaE < 0.0f) || (MWCfp < exp(-DeltaE/t))) ? -1:1;

      s[x%sizex+sizex*(y%sizey+sizey*ind)] = (char)factor*p;

   }

   __syncthreads();

}

"""

# find prime factors of a number

# Get for WWW :

# http://pythonism.wordpress.com/2008/05/17/looking-at-factorisation-in-python/

def PrimeFactors(x):

    factorlist=numpy.array([]).astype('uint32')

    loop=2

    while loop<=x:

        if x%loop==0:

            x/=loop

            factorlist=numpy.append(factorlist,[loop])

        else:

            loop+=1

    return factorlist

# Try to find the best thread number in Hybrid approach (Blocks&Threads)

# output is thread number

def BestThreadsNumber(jobs):

    factors=PrimeFactors(jobs)

    matrix=numpy.append([factors],[factors[::-1]],axis=0)

    threads=1

    for factor in matrix.transpose().ravel():

        threads=threads*factor

        if threads*threads>jobs:

            break

    return(long(threads))

def ImageOutput(sigma,prefix):

    Max=sigma.max()

    Min=sigma.min()

    # Normalize value as 8bits Integer

    SigmaInt=(255*(sigma-Min)/(Max-Min)).astype('uint8')

    image = Image.fromarray(SigmaInt)

    image.save("%s.jpg" % prefix)

def Metropolis(sigma,T,J,B,iterations): 

    start=time.time()

    SizeX,SizeY=sigma.shape

    for p in xrange(0,iterations):

        # Random access coordonate

        X,Y=numpy.random.randint(SizeX),numpy.random.randint(SizeY)

        DeltaE=J*sigma[X,Y]*(2*(sigma[X,(Y+1)%SizeY]+

                                sigma[X,(Y-1)%SizeY]+

                                sigma[(X-1)%SizeX,Y]+

                                sigma[(X+1)%SizeX,Y])+B)

        if DeltaE < 0. or random() < exp(-DeltaE/T):

            sigma[X,Y]=-sigma[X,Y]

    duration=time.time()-start

    return(duration)

def MetropolisAllOpenCL(sigmaDict,TList,J,B,iterations,jobs,ParaStyle,Alu,Device):

    # sigmaDict & Tlist are NOT respectively array & float

    # sigmaDict : dict of array for each temperatoire

    # TList : list of temperatures

    # Initialisation des variables en les CASTant correctement

    # Je detecte un peripherique GPU dans la liste des peripheriques

    HasGPU=False

    Id=1

    # Primary Device selection based on Device Id

    for platform in cl.get_platforms():

        for device in platform.get_devices():

            #deviceType=cl.device_type.to_string(device.type)

            deviceType="xPU"

            if Id==Device and not HasGPU:

                GPU=device

                print "CPU/GPU selected: ",device.name

                HasGPU=True

            Id=Id+1

    # Je cree le contexte et la queue pour son execution

    # ctx = cl.create_some_context()

    ctx = cl.Context([GPU])

    queue = cl.CommandQueue(ctx,

                            properties=cl.command_queue_properties.PROFILING_ENABLE)

    # Je recupere les flag possibles pour les buffers

    mf = cl.mem_flags

    # Concatenate all sigma in single array

    sigma=numpy.copy(sigmaDict[TList[0]])

    for T in TList[1:]:

        sigma=numpy.concatenate((sigma,sigmaDict[T]),axis=1)

    sigmaCL = cl.Buffer(ctx, mf.WRITE_ONLY|mf.COPY_HOST_PTR,hostbuf=sigma)

    TCL = cl.Buffer(ctx, mf.WRITE_ONLY|mf.COPY_HOST_PTR,hostbuf=TList)

    MetropolisCL = cl.Program(ctx,KERNEL_CODE_OPENCL).build( \

        options = "-cl-mad-enable -cl-fast-relaxed-math")

    SizeX,SizeY=sigmaDict[TList[0]].shape

    if ParaStyle=='Blocks':

        # Call OpenCL kernel

        # (1,) is Global work size (only 1 work size)

        # (1,) is local work size

        # SeedZCL is lattice translated in CL format

        # SeedWCL is lattice translated in CL format

        # step is number of iterations

        CLLaunch=MetropolisCL.MainLoopGlobal(queue,(jobs,),None,

                                             sigmaCL,

                                             TCL, 

                                             numpy.float32(J),

                                             numpy.float32(B),

                                             numpy.uint32(SizeX),

                                             numpy.uint32(SizeY),

                                             numpy.uint32(iterations),

                                             numpy.uint32(nprnd(2**31-1)),

                                             numpy.uint32(nprnd(2**31-1)))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,jobs,1,ParaStyle)

    elif ParaStyle=='Threads':

        # It's necessary to put a Local_ID equal to a Global_ID

        # Jobs are to be considerated as global number of jobs to do

        # And to be distributed to entities

        # For example :

        # G_ID=10 & L_ID=10 : 10 Threads on 1 UC

        # G_ID=10 & L_ID=1 : 10 Threads on 1 UC

        CLLaunch=MetropolisCL.MainLoopLocal(queue,(jobs,),(jobs,),

                                            sigmaCL,

                                            TCL,

                                            numpy.float32(J),

                                            numpy.float32(B),

                                            numpy.uint32(SizeX),

                                            numpy.uint32(SizeY),

                                            numpy.uint32(iterations),

                                            numpy.uint32(nprnd(2**31-1)),

                                            numpy.uint32(nprnd(2**31-1)))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,1,jobs,ParaStyle)

    else:

        threads=BestThreadsNumber(jobs)

        # en OpenCL, necessaire de mettre un Global_id identique au local_id

        CLLaunch=MetropolisCL.MainLoopHybrid(queue,(jobs,),(threads,),

                                             sigmaCL,

                                             TCL,

                                             numpy.float32(J),

                                             numpy.float32(B),

                                             numpy.uint32(SizeX),

                                             numpy.uint32(SizeY),

                                             numpy.uint32(iterations),

                                             numpy.uint32(nprnd(2**31-1)),

                                             numpy.uint32(nprnd(2**31-1)))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,jobs/threads,threads,ParaStyle)

    CLLaunch.wait()

    cl.enqueue_copy(queue, sigma, sigmaCL).wait()

    elapsed = 1e-9*(CLLaunch.profile.end - CLLaunch.profile.start)

    sigmaCL.release()

    results=numpy.split(sigma,len(TList),axis=1)

    for T in TList:

        sigmaDict[T]=numpy.copy(results[numpy.nonzero(TList == T)[0][0]])

    return(elapsed)

def MetropolisAllCuda(sigmaDict,TList,J,B,iterations,jobs,ParaStyle,Alu,Device):

    # sigmaDict & Tlist are NOT respectively array & float

    # sigmaDict : dict of array for each temperatoire

    # TList : list of temperatures

    # Avec PyCUDA autoinit, rien a faire !

    mod = SourceModule(KERNEL_CODE_CUDA)

    MetropolisBlocksCuda=mod.get_function("MainLoopGlobal")

    MetropolisThreadsCuda=mod.get_function("MainLoopLocal")

    MetropolisHybridCuda=mod.get_function("MainLoopHybrid")

    # Concatenate all sigma in single array

    sigma=numpy.copy(sigmaDict[TList[0]])

    for T in TList[1:]:

        sigma=numpy.concatenate((sigma,sigmaDict[T]),axis=1)

    sigmaCU=cuda.InOut(sigma)

    TCU=cuda.InOut(TList)

    SizeX,SizeY=sigmaDict[TList[0]].shape

    start = pycuda.driver.Event()

    stop = pycuda.driver.Event()

    start.record()

    start.synchronize()

    if ParaStyle=='Blocks':

        # Call CUDA kernel

        # (1,) is Global work size (only 1 work size)

        # (1,) is local work size

        # SeedZCL is lattice translated in CL format

        # SeedWCL is lattice translated in CL format

        # step is number of iterations

        MetropolisBlocksCuda(sigmaCU,

                             TCU, 

                             numpy.float32(J),

                             numpy.float32(B),

                             numpy.uint32(SizeX),

                             numpy.uint32(SizeY),

                             numpy.uint32(iterations),

                             numpy.uint32(nprnd(2**31-1)),

                             numpy.uint32(nprnd(2**31-1)),

                             grid=(jobs,1),block=(1,1,1))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,jobs,1,ParaStyle)

    elif ParaStyle=='Threads':

        MetropolisThreadsCuda(sigmaCU,

                              TCU,

                              numpy.float32(J),

                              numpy.float32(B),

                              numpy.uint32(SizeX),

                              numpy.uint32(SizeY),

                              numpy.uint32(iterations),

                              numpy.uint32(nprnd(2**31-1)),

                              numpy.uint32(nprnd(2**31-1)),

                              grid=(1,1),block=(jobs,1,1))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,1,jobs,ParaStyle)

    else:

        threads=BestThreadsNumber(jobs)        

        MetropolisHybridCuda(sigmaCU,

                              TCU,

                              numpy.float32(J),

                              numpy.float32(B),

                              numpy.uint32(SizeX),

                              numpy.uint32(SizeY),

                              numpy.uint32(iterations),

                              numpy.uint32(nprnd(2**31-1)),

                              numpy.uint32(nprnd(2**31-1)),

                              grid=(jobs/threads,1),block=(threads,1,1))

        print "%s with (WorkItems/Threads)=(%i,%i) %s method done" % \

              (Alu,jobs/threads,threads,ParaStyle)

    stop.record()

    stop.synchronize()

    elapsed = start.time_till(stop)*1e-3

    results=numpy.split(sigma,len(TList),axis=1)

    for T in TList:

        sigmaDict[T]=numpy.copy(results[numpy.nonzero(TList == T)[0][0]])

    return(elapsed)

def Magnetization(sigma,M):

    return(numpy.sum(sigma)/(sigma.shape[0]*sigma.shape[1]*1.0))

def Energy(sigma,J):

    # Copier et caster 

    E=numpy.copy(sigma).astype(numpy.float32)

    # Appel par slice

    E[1:-1,1:-1]=-J*E[1:-1,1:-1]*(E[:-2,1:-1]+E[2:,1:-1]+

                                  E[1:-1,:-2]+E[1:-1,2:])

    # Bien nettoyer la peripherie

    E[:,0]=0

    E[:,-1]=0

    E[0,:]=0

    E[-1,:]=0

    Energy=numpy.sum(E)

    return(Energy/(E.shape[0]*E.shape[1]*1.0))

def DisplayCurves(T,E,M,J,B):

    plt.xlabel("Temperature")

    plt.ylabel("Energy")

    Experience,=plt.plot(T,E,label="Energy") 

    plt.legend()

    plt.show()

if __name__=='__main__':

    # Set defaults values

    # Alu can be CPU or GPU

    Alu='CPU'

    # Id of GPU : 0 

    Device=0

    # GPU style can be Cuda (Nvidia implementation) or OpenCL

    GpuStyle='OpenCL'

    # Parallel distribution can be on Threads or Blocks

    ParaStyle='Blocks'

    # Coupling factor

    J=1.

    # Magnetic Field

    B=0.

    # Size of Lattice

    Size=256

    # Default Temperatures (start, end, step)

    Tmin=0.1

    Tmax=5

    Tstep=0.1

    # Default Number of Iterations

    Iterations=Size*Size

    # Curves is True to print the curves

    Curves=False

    try:

        opts, args = getopt.getopt(sys.argv[1:],"hcj:b:z:i:s:e:p:a:d:g:t:",["coupling=","magneticfield=","size=","iterations=","tempstart=","tempend=","tempstep=","alu=","gpustyle=","parastyle="])

    except getopt.GetoptError:

        print '%s -j <Coupling Factor> -b <Magnetic Field> -z <Size of Lattice> -i <Iterations> -s <Minimum Temperature> -e <Maximum Temperature> -p <steP Temperature> -c (Print Curves) -a <CPU/GPU> -d <DeviceId> -g <CUDA/OpenCL> -t <Threads/Blocks>' % sys.argv[0]

        sys.exit(2)

    for opt, arg in opts:

        if opt == '-h':

            print '%s -j <Coupling Factor> -b <Magnetic Field> -z <Size of Lattice> -i <Iterations> -s <Minimum Temperature> -e <Maximum Temperature> -p <steP Temperature> -c (Print Curves) -a <CPU/GPU> -d <DeviceId> -g <CUDA/OpenCL> -t <Threads/Blocks/Hybrid>' % sys.argv[0]

            sys.exit()

        elif opt == '-c':

            Curves=True

        elif opt in ("-j", "--coupling"):

            J = float(arg)

        elif opt in ("-b", "--magneticfield"):

            B = float(arg)

        elif opt in ("-s", "--tempmin"):

            Tmin = float(arg)

        elif opt in ("-e", "--tempmax"):

            Tmax = float(arg)

        elif opt in ("-p", "--tempstep"):

            Tstep = float(arg)

        elif opt in ("-i", "--iterations"):

            Iterations = int(arg)

        elif opt in ("-z", "--size"):

            Size = int(arg)

        elif opt in ("-a", "--alu"):

            Alu = arg

        elif opt in ("-d", "--device"):

            Device = int(arg)

        elif opt in ("-g", "--gpustyle"):

            GpuStyle = arg

        elif opt in ("-t", "--parastyle"):

            ParaStyle = arg

    if Alu=='CPU' and GpuStyle=='CUDA':

        print "Alu can't be CPU for CUDA, set Alu to GPU"

        Alu='GPU'

    if ParaStyle not in ('Blocks','Threads','Hybrid'):

        print "%s not exists, ParaStyle set as Threads !" % ParaStyle

        ParaStyle='Blocks'

    print "Compute unit : %s" % Alu

    print "Device Identification : %s" % Device

    print "GpuStyle used : %s" % GpuStyle

    print "Parallel Style used : %s" % ParaStyle

    print "Coupling Factor : %s" % J

    print "Magnetic Field :  %s" % B

    print "Size of lattice : %s" % Size

    print "Iterations : %s" % Iterations

    print "Temperature on start : %s" % Tmin

    print "Temperature on end : %s" % Tmax

    print "Temperature step : %s" % Tstep

    if GpuStyle=='CUDA':

        # For PyCUDA import

        import pycuda.driver as cuda

        import pycuda.gpuarray as gpuarray

        import pycuda.autoinit

        from pycuda.compiler import SourceModule

    if GpuStyle=='OpenCL':

        # For PyOpenCL import

        import pyopencl as cl

        Id=1

        for platform in cl.get_platforms():

            for device in platform.get_devices():

                #deviceType=cl.device_type.to_string(device.type)

                deviceType="xPU"

                print "Device #%i of type %s : %s" % (Id,deviceType,device.name)

                Id=Id+1

    LAPIMAGE=False

    sigmaIn=numpy.where(numpy.random.randn(Size,Size)>0,1,-1).astype(numpy.int8)

    ImageOutput(sigmaIn,"Ising2D_Serial_%i_Initial" % (Size))

    # La temperature est passee comme parametre, attention au CAST !

    Trange=numpy.arange(Tmin,Tmax+Tstep,Tstep).astype(numpy.float32)

    E=[]

    M=[]

    sigma={}

    for T in Trange:

        sigma[T]=numpy.copy(sigmaIn)

    jobs=len(Trange)

    # For GPU, all process are launched

    if GpuStyle=='CUDA':

        duration=MetropolisAllCuda(sigma,Trange,J,B,Iterations,jobs,ParaStyle,Alu,Device)

    else:

        duration=MetropolisAllOpenCL(sigma,Trange,J,B,Iterations,jobs,ParaStyle,Alu,Device)

    print BestThreadsNumber(len(Trange))

    for T in Trange:

        E=numpy.append(E,Energy(sigma[T],J))

        M=numpy.append(M,Magnetization(sigma[T],B))

        print "CPU Time for each : %f" % (duration/len(Trange))

        print "Total Energy at Temperature %f : %f" % (T,E[-1])

        print "Total Magnetization at Temperature %f : %f" % (T,M[-1])        

        ImageOutput(sigma[T],"Ising2D_Serial_%i_%1.1f_Final" % (Size,T))

    if Curves:

        DisplayCurves(Trange,E,M,J,B)