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Toa_gpu_2dtti_fd_1orderfunction.cu
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Toa_gpu_2dtti_fd_1orderfunction.cu
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//a#########################################################
//a## 2D Acoustic TTI Medium Forward
//a## Ps : P + sv wave and get rid of sv
//a## GPU(CUDA)
//a##
//a##/*a***************************
//a##Function for VTI medium modeling,2017.2.13
//a##
//a## Ps: the function of modeling following:
//a##
//a## du/dt=1/rho*dp/dx ,
//a## dw/dt=1/rho*dq/dz ,
//a## dp/dt=rho*vpx^2*du/dx+rho*vp*vpn*dw/dz ,
//a## dq/dt=rho*vp*vpn*du/dx+rho*vp^2*dw/dz ,
//a## vpx^2=vp^2*(1+2*epsilon);
//a## vpn^2=vp^2*(1+2*delta);
//a##*********a*******************/
//a##
//a## code by Rong Tao
//a## 2017.2.21
//a#########################################################
#include <stdio.h>
#include <malloc.h>
#include <math.h>
#include <stdlib.h>
#include <string.h>
#include <cuda_runtime.h>
#define pi 3.141592653
#define mm 4
__device__ float d0;
__constant__ float c[mm]={1.196289,-0.0797526,0.009570313,-0.0006975447};
//a################################################################################
void check_gpu_error (const char *msg)
/*< check GPU errors >*/
{
cudaError_t err = cudaGetLastError ();
if (cudaSuccess != err) {
printf("Cuda error: %s: %s\n", msg, cudaGetErrorString (err));
exit(0);
}
}
//a################################################################################
__global__ void add_source(float pfac,float xsn,float zsn,int nx,int nz,int nnx,int nnz,float dt,float t,
float favg,int wtype,int npml,int is,int ds,float *P,float *Q)
/*< generate ricker wavelet with time deley >*/
{
int ixs,izs;
float x_,xx_,tdelay,ts,source=0.0,fs;
tdelay=1.0/favg;
ts=t-tdelay;
fs=xsn+(is-1)*ds;
if(wtype==1)//ricker wavelet
{
x_=favg*ts;
xx_=x_*x_;
source=(1-2*pi*pi*(xx_))*exp(-(pi*pi*xx_));
}else if(wtype==2){//derivative of gaussian
x_=(-4)*favg*favg*pi*pi/log(0.1);
source=(-2)*pi*pi*ts*exp(-x_*ts*ts);
}else if(wtype==3){//derivative of gaussian
x_=(-1)*favg*favg*pi*pi/log(0.1);
source=exp(-x_*ts*ts);
}
if(t<=2*tdelay)
{
ixs = (int)(fs+0.5)+npml-1;
izs = (int)(zsn+0.5)+npml-1;
P[ixs*nnz+izs]+=pfac*source;
Q[ixs*nnz+izs]+=pfac*source;
}
}
/*******************func*********************/
__global__ void update_vel(int nx,int nz,int nnx,int nnz,int npml,float dt,float dx,float dz,
float *u0,float *w0,float *u1,float *w1,float *P,float *Q,
float *coffx1,float *coffx2,float *coffz1,float *coffz2,float *theta)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
int ix,iz,im;
float dtx,dtz,Px,Pz,Qz,Qx;
ix=id/nnz;
iz=id%nnz;
dtx=dt/dx;
dtz=dt/dz;
if(id>=mm&&id<nnx*nnz-mm)
{
if(ix>=mm&&ix<(nnx-mm)&&iz>=mm&&iz<(nnz-mm))
{
Px=0.0;
Pz=0.0;
Qz=0.0;
Qx=0.0;
for(im=0;im<mm;im++)
{
Px+=c[im]*(P[id+(im+1)*nnz]-P[id-im*nnz]);
Pz+=c[im]*(P[id+im+1] -P[id-im]);
Qz+=c[im]*(Q[id+im+1] -Q[id-im]);
Qx+=c[im]*(Q[id+(im+1)*nnz]-Q[id-im*nnz]);
}
u1[id]=coffx2[ix]*coffz2[iz]*u0[id]-coffx1[ix]*coffz1[iz]*(cos(theta[id])*dtx*Px-sin(theta[id])*dtz*Pz);
w1[id]=coffx2[ix]*coffz2[iz]*w0[id]-coffx1[ix]*coffz1[iz]*(sin(theta[id])*dtx*Qx+cos(theta[id])*dtz*Qz);
}
}
}
/*******************func***********************/
__global__ void update_stress(int nx,int nz,int nnx,int nnz,float dt,float dx,float dz,
float *u1,float *w1,float *P,float *Q,float *vp,int npml,
float *px1,float *px0,float *pz1,float *pz0,float *qx1,float *qx0,float *qz1,float *qz0,
float *acoffx1,float *acoffx2,float *acoffz1,float *acoffz2,
float *delta,float *epsilon,float *theta,int fs,int ds,int zs,int is,bool SV)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
int im,ix,iz,rx,rz,R=15,r=4;
float dtx,dtz, ux,uz,wz,wx,ee,dd;
ix=id/nnz;
iz=id%nnz;
dtx=dt/dx;
dtz=dt/dz;
if(id>=mm&&id<nnx*nnz-mm)
{
/************************i****************************************/
/************************iso circle start*************************/
rx=ix-(fs+(is-1)*ds+npml);
rz=iz-(zs+npml);
if(SV){
if((rx*rx+rz*rz)<=R*R){
if((rx*rx+rz*rz)<=r*r){
ee = 0.0;
dd = 0.0;
}else{
ee = 0.5*(1-cos(pi*((sqrtf(rx*rx+rz*rz)-r)*4.0/(R*3.0-1))))*epsilon[id];
dd = 0.5*(1-cos(pi*((sqrtf(rx*rx+rz*rz)-r)*4.0/(R*3.0-1))))*delta[id];
}
}else{
ee=epsilon[id];
dd=delta[id];
}
}else{
ee=epsilon[id];
dd=delta[id];
}
/************************ iso circle end *************************/
/************************i****************************************/
if(ix>=mm&&ix<(nnx-mm)&&iz>=mm&&iz<(nnz-mm))
{
ux=0.0;
uz=0.0;
wz=0.0;
wx=0.0;
for(im=0;im<mm;im++)
{
ux+=c[im]*(u1[id+im*nnz]-u1[id-(im+1)*nnz]);
uz+=c[im]*(u1[id+im] -u1[id-im-1]);
wz+=c[im]*(w1[id+im] -w1[id-im-1]);
wx+=c[im]*(w1[id+im*nnz]-w1[id-(im+1)*nnz]);
}
px1[id]=acoffx2[ix]*acoffz2[iz]*px0[id]
-acoffx1[ix]*acoffz1[iz]*vp[id]*vp[id]*(1+2*ee)* (cos(theta[id])*dtx*ux-sin(theta[id])*dtz*uz);
pz1[id]=acoffx2[ix]*acoffz2[iz]*pz0[id]
-acoffx1[ix]*acoffz1[iz]*vp[id]*vp[id]*sqrtf(1+2*dd)*(sin(theta[id])*dtx*wx+cos(theta[id])*dtz*wz);
qx1[id]=acoffx2[ix]*acoffz2[iz]*qx0[id]
-acoffx1[ix]*acoffz1[iz]*vp[id]*vp[id]*sqrtf(1+2*dd)*(cos(theta[id])*dtx*ux-sin(theta[id])*dtz*uz);
qz1[id]=acoffx2[ix]*acoffz2[iz]*qz0[id]
-acoffx1[ix]*acoffz1[iz]*vp[id]*vp[id]* (sin(theta[id])*dtx*wx+cos(theta[id])*dtz*wz);
P[id]=px1[id]+pz1[id];
Q[id]=qx1[id]+qz1[id];
}
}
}
/********************func**********************/
__global__ void get_d0(float dx,float dz,int nnx,int nnz,int npml,float *vp)
{
d0=10.0*vp[nnx*nnz/2]*log(100000.0)/(2.0*npml*((dx+dz)/2.0));
}
/*************func*******************/
void pad_vv(int nx,int nz,int nnx,int nnz,int npml,float *ee)
{
int ix,iz,id;
for(id=0;id<nnx*nnz;id++)
{
ix=id/nnz;
iz=id%nnz;
if(ix<npml){
ee[id]=ee[npml*nnz+iz]; //left
}else if(ix>=nnx-npml){
ee[id]=ee[(nnx-npml-1)*nnz+iz];//right
}
}
for(id=0;id<nnx*nnz;id++)
{
ix=id/nnz;
iz=id%nnz;
if(iz<npml){
ee[id]=ee[ix*nnz+npml];//up
}else if(iz>=nnz-npml){
ee[id]=ee[ix*nnz+nnz-npml-1];//down
}
// if(ee[id]==0){printf("ee[%d][%d]==0.0\n",ix,iz);exit(0);}
}
}
/*************func*******************/
void read_file(char FN1[],char FN2[],char FN3[],char FN4[],int nx,int nz,int nnx,int nnz,
float *vv,float *epsilon,float *delta,float *theta,int npml)
{
int i,j,id;
FILE *fp1,*fp2,*fp3,*fp4;
if((fp1=fopen(FN1,"rb"))==NULL)printf("error open <%s>!\n",FN1);
if((fp2=fopen(FN2,"rb"))==NULL)printf("error open <%s>!\n",FN2);
if((fp3=fopen(FN3,"rb"))==NULL)printf("error open <%s>!\n",FN3);
if((fp4=fopen(FN4,"rb"))==NULL)printf("error open <%s>!\n",FN4);
for(i=npml;i<nx+npml;i++)
{
for(j=npml;j<nz+npml;j++)
{
id=i*nnz+j;
fread(&vv[id],4L,1,fp1);//vv[id]=vv[npml*nnz+npml];
fread(&epsilon[id],4L,1,fp2);//epsilon[id]=0;
fread(&delta[id],4L,1,fp3);//delta[id]=0;
fread(&theta[id],4L,1,fp4);theta[id]*=pi/180.0;//theta[id]=0;
}
}
fclose(fp1);
fclose(fp2);
fclose(fp3);
fclose(fp4);
}
/*************func*******************/
__global__ void initial_coffe(float dt,int nn,float *coff1,float *coff2,float *acoff1,float *acoff2,int npml)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
if(id<nn+2*npml)
{
if(id<npml)
{
coff1[id]=1.0/(1.0+(dt*d0*pow((npml-0.5-id)/npml,2.0))/2.0);
coff2[id]=coff1[id]*(1.0-(dt*d0*pow((npml-0.5-id)/npml,2.0))/2.0);
acoff1[id]=1.0/(1.0+(dt*d0*pow(((npml-id)*1.0)/npml,2.0))/2.0);
acoff2[id]=acoff1[id]*(1.0-(dt*d0*pow(((npml-id)*1.0)/npml,2.0))/2.0);
}else if(id>=npml&&id<npml+nn){
coff1[id]=1.0;
coff2[id]=1.0;
acoff1[id]=1.0;
acoff2[id]=1.0;
}else{
coff1[id]=1.0/(1.0+(dt*d0*pow((0.5+id-nn-npml)/npml,2.0))/2.0);
coff2[id]=coff1[id]*(1.0-(dt*d0*pow((0.5+id-nn-npml)/npml,2.0))/2.0);
acoff1[id]=1.0/(1.0+(dt*d0*pow(((id-nn-npml)*1.0)/npml,2.0))/2.0);
acoff2[id]=acoff1[id]*(1.0-(dt*d0*pow(((id-nn-npml)*1.0)/npml,2.0))/2.0);
}
}
}
/*************func*******************/
__global__ void shot_record(int nnx, int nnz, int nx, int nz, int npml, int it, int nt, float *P, float *shot)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
if(id<nx)
{
shot[it+nt*id]=P[npml+nnz*(id+npml)];
}
}
/*************func**************/
/*************func**************/
__global__ void mute_directwave(int nx,int nt,float dt,float favg,
float dx,float dz,int fs,int ds,int zs,int is,
float *vp,float *epsilu,float *theta,float *shot,int tt)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
int mu_t,mu_nt;
float mu_x,mu_z,mu_t0;
int ix=id/nt;
int it=id%nt;
if(id<nx*nt)
{
mu_x=dx*abs(ix-fs-(is-1)*ds);
mu_z=dz*zs;
mu_t0=sqrtf(pow(mu_x,2)+pow(mu_z,2))/(vp[1]*( 1+(sqrtf(1+2*epsilu[1])-1) * cos(theta[1]) ) );
mu_t=(int)(2.0/(dt*favg));
mu_nt=(int)(mu_t0/dt)+mu_t+tt;
if((it>(int)(mu_t0/dt)-tt)&&(it<mu_nt))
shot[id]=0.0;
}
}
//a########################################################################
int main(int argc,char *argv[])
{
int is, it, nx, nz, nnx, nnz, nt, wtype;
int ns, ds, fs, zs, npml;
float dx, dz, dt, t, pfac, favg;
float *v, *e, *d, *b;
float *vp, *epsilon, *delta, *theta;
float *u0, *u1, *px0, *qx0, *px1, *qx1;
float *w0, *w1, *pz0, *qz0, *pz1, *qz1;
float *P, *Q, *shot_Dev, *shot_Hos;
float *coffx1,*coffx2,*coffz1,*coffz2,*acoffx1,*acoffx2,*acoffz1,*acoffz2;
clock_t start, end;
/*************wavelet\boundary**************/
wtype=1;npml=50;
/********** dat document ***********/
char FN1[250]={"thrust_vel_711_300.dat"};
char FN2[250]={"thrust_epsilon_711_300.dat"};
char FN3[250]={"thrust_delta_711_300.dat"};
char FN4[250]={"thrust_theta_711_300.dat"};
char FN5[250]={"thrust_shot_unstable.dat"};
char FN6[250]={"thrust_snap_unstable.dat"};
/********aaa************/
FILE *fpsnap, *fpshot;
fpshot=fopen(FN5,"wb");
fpsnap=fopen(FN6,"wb");
/********* parameters *************/
nx=600;
nz=300; favg=40; pfac=10.0;
dx=5.0;
dz=5.0;
nt=801;
dt=0.0005;
ns=1;
fs=200;
ds=0;
zs=140;
/*************v***************/
nnx=nx+2*npml;
nnz=nz+2*npml;
/************a*************/
v=(float*)malloc(nnz*nnx*sizeof(float));
e=(float*)malloc(nnz*nnx*sizeof(float));
d=(float*)malloc(nnz*nnx*sizeof(float));
b=(float*)malloc(nnz*nnx*sizeof(float));
shot_Hos=(float*)malloc(nt*nx*sizeof(float));
read_file(FN1,FN2,FN3,FN4,nx,nz,nnx,nnz,v,e,d,b,npml);
/****************************/
pad_vv(nx,nz,nnx,nnz,npml,e);
pad_vv(nx,nz,nnx,nnz,npml,d);
pad_vv(nx,nz,nnx,nnz,npml,v);
pad_vv(nx,nz,nnx,nnz,npml,b);
cudaSetDevice(0);// initialize device, default device=0;
check_gpu_error("Failed to initialize device!");
/****************************/
cudaMalloc(&vp, nnz*nnx*sizeof(float));
cudaMalloc(&epsilon, nnz*nnx*sizeof(float));
cudaMalloc(&delta, nnz*nnx*sizeof(float));
cudaMalloc(&theta, nnz*nnx*sizeof(float));
cudaMemcpy(vp, v, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(epsilon, e, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(delta, d, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(theta, b, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
/****************************/
cudaMalloc(&u0, nnz*nnx*sizeof(float)); cudaMalloc(&u1, nnz*nnx*sizeof(float));
cudaMalloc(&w0, nnz*nnx*sizeof(float)); cudaMalloc(&w1, nnz*nnx*sizeof(float));
cudaMalloc(&P, nnz*nnx*sizeof(float)); cudaMalloc(&Q, nnz*nnx*sizeof(float));
cudaMalloc(&px0, nnz*nnx*sizeof(float)); cudaMalloc(&px1, nnz*nnx*sizeof(float));
cudaMalloc(&pz0, nnz*nnx*sizeof(float)); cudaMalloc(&pz1, nnz*nnx*sizeof(float));
cudaMalloc(&qx0, nnz*nnx*sizeof(float)); cudaMalloc(&qx1, nnz*nnx*sizeof(float));
cudaMalloc(&qz0, nnz*nnx*sizeof(float)); cudaMalloc(&qz1, nnz*nnx*sizeof(float));
cudaMalloc(&coffx1, nnx*sizeof(float)); cudaMalloc(&coffx2, nnx*sizeof(float));
cudaMalloc(&coffz1, nnz*sizeof(float)); cudaMalloc(&coffz2, nnz*sizeof(float));
cudaMalloc(&acoffx1, nnx*sizeof(float)); cudaMalloc(&acoffx2, nnx*sizeof(float));
cudaMalloc(&acoffz1, nnz*sizeof(float)); cudaMalloc(&acoffz2, nnz*sizeof(float));
cudaMalloc(&shot_Dev, nx*nt*sizeof(float));
/******************************/
check_gpu_error("Failed to allocate memory for variables!");
get_d0<<<1, 1>>>(dx, dz, nnx, nnz, npml, vp);
initial_coffe<<<(nnx+511)/512, 512>>>(dt,nx,coffx1,coffx2,acoffx1,acoffx2,npml);
initial_coffe<<<(nnz+511)/512, 512>>>(dt,nz,coffz1,coffz2,acoffz1,acoffz2,npml);
printf("--------------------------------------------------------\n");
printf("--- \n");
start = clock();
/**********IS Loop start*******/
for(is=1;is<=ns;is++)
{
printf("--- IS=%3d \n",is);
cudaMemset(u0, 0, nnz*nnx*sizeof(float)); cudaMemset(u1, 0, nnz*nnx*sizeof(float));
cudaMemset(w0, 0, nnz*nnx*sizeof(float)); cudaMemset(w1, 0, nnz*nnx*sizeof(float));
cudaMemset(P, 0, nnz*nnx*sizeof(float)); cudaMemset(Q, 0, nnz*nnx*sizeof(float));
cudaMemset(px0, 0, nnz*nnx*sizeof(float)); cudaMemset(px1, 0, nnz*nnx*sizeof(float));
cudaMemset(pz0, 0, nnz*nnx*sizeof(float)); cudaMemset(pz1, 0, nnz*nnx*sizeof(float));
cudaMemset(qx0, 0, nnz*nnx*sizeof(float)); cudaMemset(qx1, 0, nnz*nnx*sizeof(float));
cudaMemset(qz0, 0, nnz*nnx*sizeof(float)); cudaMemset(qz1, 0, nnz*nnx*sizeof(float));
cudaMemset(shot_Dev, 0, nt*nx*sizeof(float));
for(it=0,t=dt;it<nt;it++,t+=dt)
{
if(it%1000==0&&is==1)printf("--- is===%d it===%d\n",is,it);
add_source<<<1,1>>>(pfac,fs,zs,nx,nz,nnx,nnz,dt,t,favg,wtype,npml,is,ds,P,Q);
update_vel<<<(nnx*nnz+511)/512, 512>>>(nx,nz,nnx,nnz,npml,dt,dx,dz,u0,w0,u1,w1,P,Q,coffx1,coffx2,coffz1,coffz2,theta);
update_stress<<<(nnx*nnz+511)/512, 512>>>(nx,nz,nnx,nnz,dt,dx,dz,u1,w1,P,Q,vp,npml,px1,px0,pz1,pz0,qx1,qx0,qz1,qz0,
acoffx1,acoffx2,acoffz1,acoffz2,delta,epsilon,theta,fs,ds,zs,is,false);
u0=u1; w0=w1; px0=px1; pz0=pz1; qx0=qx1; qz0=qz1;
shot_record<<<(nx+511)/512, 512>>>(nnx, nnz, nx, nz, npml, it, nt, P, shot_Dev);
if((is==1)&&(it%100==0)&&it!=0)
{
cudaMemcpy(e, P, nnz*nnx*sizeof(float), cudaMemcpyDeviceToHost);
//fseek(fpsnap,(int)(it/100)*(nnx)*(nnz)*4L,0);
fwrite(e,4L,nnx*nnz,fpsnap);
}
}//it loop end
// mute_directwave<<<(nx*nt+511)/512, 512>>>(nx,nt,dt,favg,dx,dz,fs,ds,zs,is,vp,epsilu,theta,shot_Dev,30);
cudaMemcpy(shot_Hos, shot_Dev, nt*nx*sizeof(float), cudaMemcpyDeviceToHost);
fseek(fpshot,(is-1)*nt*nx*sizeof(float),0);
fwrite(shot_Hos,sizeof(float),nt*nx,fpshot);
}//is loop end
end = clock();
/*********IS Loop end*********/
printf("--- The forward is over \n");
printf("--- Complete!!!!!!!!! \n");
printf("total %d shots: %f (s)\n", ns, ((float)(end-start))/CLOCKS_PER_SEC);
/***********close************/
fclose(fpsnap); fclose(fpshot);
/***********free*************/
cudaFree(coffx1); cudaFree(coffx2);
cudaFree(coffz1); cudaFree(coffz2);
cudaFree(acoffx1); cudaFree(acoffx2);
cudaFree(acoffz1); cudaFree(acoffz2);
cudaFree(u0); cudaFree(u1);
cudaFree(w0); cudaFree(w1);
cudaFree(P); cudaFree(Q);
cudaFree(px0); cudaFree(px1);
cudaFree(pz0); cudaFree(pz1);
cudaFree(qx0); cudaFree(qx1);
cudaFree(qz0); cudaFree(qz1);
cudaFree(shot_Dev);
cudaFree(vp);
cudaFree(epsilon);
cudaFree(delta);
cudaFree(theta);
/***************host free*****************/
free(v); free(e); free(d);free(b);
free(shot_Hos);
}