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GPU_vti2dfd_kernels.cu
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GPU_vti2dfd_kernels.cu
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//a#########################################################
//a## 2D Acoustic VTI Medium Forward
//a##
//a## Ps :GPU(CUDA)
//a## Copyright (C) RongTao, All right reserve.
//a##/*a***************************
//a##Function for VTI medium modeling,
//a##
//a## Ps: the function of modeling following:
//a##
//a## du/dt_=1/rho*dp/dx_ ,
//a## dv/dt_=1/rho*dp/dy_ ,
//a## dw/dt_=1/rho*dq/dz_ ,
//a## dp/dt_=rho*vpx^2*(du/dx_+dv/dy_)+rho*vp*vpn*dw/dz_ ,
//a## dq/dt_=rho*vp*vpn*(du/dx_+dv/dy_)+rho*vp^2*dw/dz_ ,
//a## vpx^2=vp^2*(1+2*epsilu);
//a## vpn^2=vp^2*(1+2*deta);
//a##
//a##*********a*******************/
//a##
//a## Rong Tao
//a##
//a#########################################################
#include<stdio.h>
#include<malloc.h>
#include<math.h>
#include<stdlib.h>
#include<string.h>
#include<cuda_runtime.h>
#define pi 3.141592653
__device__ float d0;
__device__ int mm=4;
__constant__ float c[4]={1.196289,-0.0797526,0.009570313,-0.0006975447};
void check_gpu_error2d (const char *msg)
/*< check GPU errors >*/
{
cudaError_t err = cudaGetLastError ();
if (cudaSuccess != err) {
printf("Cuda error: %s: %s\n", msg, cudaGetErrorString (err));
exit(0);
}
}
/*************func*******************/
void pad_vv2d(int nx,int nz,int nnx,int nnz,int npd,float *ee)
{
int ix,iz,id;
for(id=0;id<nnx*nnz;id++)
{
ix=id/nnz;
iz=id%nnz;
if(ix<npd){
ee[id]=ee[npd*nnz+iz]; //left
}else if(ix>=nnx-npd){
ee[id]=ee[(nnx-npd-1)*nnz+iz];//right
}
}
for(id=0;id<nnx*nnz;id++)
{
ix=id/nnz;
iz=id%nnz;
if(iz<npd){
ee[id]=ee[ix*nnz+npd];//up
}else if(iz>=nnz-npd){
ee[id]=ee[ix*nnz+nnz-npd-1];//down
}
//if(ee[id]==0){printf("ee[%d][%d]==0.0\n",ix,iz);exit(0);}
}
}
/*************func*******************/
bool read_file2d(const char FN1[],const char FN2[],const char FN3[],
int nx,int nz,int nnx,int nnz,float *vv,float *epsilu,float *deta,int npd)
{
int i,j,id,vmax=0.0;
FILE *fp1,*fp2,*fp3;
if((fp1=fopen(FN1,"rb"))==NULL){printf("error open <%s>!\n",FN1);return false;}
if((fp2=fopen(FN2,"rb"))==NULL){printf("error open <%s>!\n",FN2);return false;}
if((fp3=fopen(FN3,"rb"))==NULL){printf("error open <%s>!\n",FN3);return false;}
for(i=npd;i<nx+npd;i++)
{
for(j=npd;j<nz+npd;j++)
{
id=i*nnz+j;
fread(&vv[id],4L,1,fp1);if(vmax<vv[id])vmax=vv[id];
fread(&epsilu[id],4L,1,fp2);
fread(&deta[id],4L,1,fp3);
}
}
fclose(fp1);printf("vmax=%d\n",vmax);
fclose(fp2);
fclose(fp3);
return true;
}
/********************func**********************/
__global__ void get_d02d(float dx_,float dz_,int nnx,int nnz,int npd,float *vp)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
if(id<1)d0=10.0*vp[nnx*nnz/2]*log(100000.0)/(2.0*npd*((dx_+dz_)/2.0));
}
/*************func*******************/
__global__ void initial_coffe2d(float dt_,int nn,float *coff1,float *coff2,float *acoff1,float *acoff2,int npd)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
if(id<nn+2*npd)
{
if(id<npd)
{
coff1[id]=1.0/(1.0+(dt_*d0*pow((npd-0.5-id)/npd,2.0))/2.0);
coff2[id]=coff1[id]*(1.0-(dt_*d0*pow((npd-0.5-id)/npd,2.0))/2.0);
acoff1[id]=1.0/(1.0+(dt_*d0*pow(((npd-id)*1.0)/npd,2.0))/2.0);
acoff2[id]=acoff1[id]*(1.0-(dt_*d0*pow(((npd-id)*1.0)/npd,2.0))/2.0);
}else if(id>=npd&&id<npd+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-npd)/npd,2.0))/2.0);
coff2[id]=coff1[id]*(1.0-(dt_*d0*pow((0.5+id-nn-npd)/npd,2.0))/2.0);
acoff1[id]=1.0/(1.0+(dt_*d0*pow(((id-nn-npd)*1.0)/npd,2.0))/2.0);
acoff2[id]=acoff1[id]*(1.0-(dt_*d0*pow(((id-nn-npd)*1.0)/npd,2.0))/2.0);
}
}
}
/*************func*******************/
__global__ void shot_record2d(int nnx, int nnz, int nx, int nz, int npd, int it, int nt_, float *P, float *shot)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
if(id<nx)
{
shot[it+nt_*id]=P[npd+nnz*(id+npd)];
}
}
/*************func**************/
__global__ void mute_directwave2d(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 *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]*sqrtf(1+2*epsilu[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################################################################################
__global__ void add_source2d(float pfac,float xsn,float zsn,int nx,int nz,int nnx,int nnz,float dt_,float t,
float favg_,int wtype,int npd,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)+npd-1;
izs = (int)(zsn+0.5)+npd-1;
P[ixs*nnz+izs]+=pfac*source;
Q[ixs*nnz+izs]+=pfac*source;
}
}
/*******************func*********************/
__global__ void update_vel2d(int nx,int nz,int nnx,int nnz,int npd,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)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
int ix,iz,im;
float dtx,dtz,xx,zz;
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))
{
xx=0.0;
zz=0.0;
for(im=0;im<mm;im++)
{
xx+=c[im]*(P[id+(im+1)*nnz]-P[id-im*nnz]);
zz+=c[im]*(Q[id+im+1] -Q[id-im]);
}
u1[id]=coffx2[ix]*u0[id]-coffx1[ix]*dtx*xx;
w1[id]=coffz2[iz]*w0[id]-coffz1[iz]*dtz*zz;
}
}
}
/*******************func***********************/
__global__ void update_stress2d(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 npd,
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 *deta,float *epsilu,int fs,int ds,int zs,int is,int SV)
{
int id=threadIdx.x+blockDim.x*blockIdx.x;
int im,ix,iz,rx,rz,R=15,r=4;
float dtx,dtz, xx,zz,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+npd);
rz=iz-(zs+npd);
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))))*epsilu[id];
dd = 0.5*(1-cos(pi*((sqrtf(rx*rx+rz*rz)-r)*4.0/(R*3.0-1))))*deta[id];
}
}else{
ee=epsilu[id];
dd=deta[id];
}
}else{
ee=epsilu[id];
dd=deta[id];
}
/************************ iso circle end *************************/
/************************i****************************************/
if(ix>=mm&&ix<(nnx-mm)&&iz>=mm&&iz<(nnz-mm))
{
xx=0.0;
zz=0.0;
for(im=0;im<mm;im++)
{
xx+=c[im]*(u1[id+im*nnz]-u1[id-(im+1)*nnz]);
zz+=c[im]*(w1[id+im] -w1[id-im-1]);
}
px1[id]=acoffx2[ix]*px0[id]-acoffx1[ix]*vp[id]*vp[id]*(1+2*ee)*dtx*xx;
pz1[id]=acoffz2[iz]*pz0[id]-acoffz1[iz]*vp[id]*vp[id]*sqrtf(1+2*dd)*dtz*zz;
qx1[id]=acoffx2[ix]*qx0[id]-acoffx1[ix]*vp[id]*vp[id]*sqrtf(1+2*dd)*dtx*xx;
qz1[id]=acoffz2[iz]*qz0[id]-acoffz1[iz]*vp[id]*vp[id]*dtz*zz;
P[id]=px1[id]+pz1[id];
Q[id]=qx1[id]+qz1[id];
}
}
}
//###################################model#######################################
extern "C" void GPU_vti2dfd(int nx, int nz,int dx,int dz,int npd,int SV,
const char FNv[],const char FNe[],const char FNd[],
int favg,int ns,int fs,int ds,int zs,
const char FNshot[],const char FNsnap[],int nt, int dt,int run_count)
{
//int ite=0;
//loop1:if(ite>0){printf("Please ensure parameter input accurately! \n");ite++;}
float dx_,dz_,favg_,dt_,pfac;
dx_=(float)dx;
dz_=(float)dz;
favg_=(float)favg;
printf("\n##### model start #####\n");
printf("# nx=%2d, dx=%.2f, npd=%d\n",nx,dx_,npd);
printf("# nz=%2d, dz=%.2f, SV=%d\n",nz,dz_,SV);
printf("# vel=<%s>\n",FNv);
printf("# epsilu=<%s>\n",FNe);
printf("# deta=<%s>\n",FNd);
printf("# favg=%.2f\n",favg_);
printf("# ns=%3d\n",ns);
printf("# fs=%3d\n",fs);
printf("# ds=%3d\n",ds);
printf("# zs=%3d\n",zs);
printf("# shot=<%s>\n",FNshot);
printf("# snap=<%s>\n",FNsnap);
FILE *fpsnap, *fpshot;
fpshot=fopen(FNshot,"wb");
fpsnap=fopen(FNsnap,"wb");
int is, it, nnx, nnz, nt_, wtype;
float *v, *e, *d, t;
float *vp, *epsilu, *deta;
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;
wtype=1;
nt_=nt;
dt_=(float)(dt*1.0/1000000);
pfac=10.0;
nnx=nx+2*npd;
nnz=nz+2*npd;
v=(float*)malloc(nnz*nnx*sizeof(float));
e=(float*)malloc(nnz*nnx*sizeof(float));
d=(float*)malloc(nnz*nnx*sizeof(float));
shot_Hos=(float*)malloc(nt_*nx*sizeof(float));
if(read_file2d(FNv,FNe,FNd,nx,nz,nnx,nnz,v,e,d,npd))printf("Read file done !\n");
else{printf("Read file error !\n");return;}
pad_vv2d(nx,nz,nnx,nnz,npd,e);
pad_vv2d(nx,nz,nnx,nnz,npd,d);
pad_vv2d(nx,nz,nnx,nnz,npd,v);
cudaSetDevice(0);// initialize device, default device=0;
if(run_count==0)check_gpu_error2d("Failed to initialize device!");
/****************************/
cudaMalloc(&vp, nnz*nnx*sizeof(float));
cudaMalloc(&epsilu, nnz*nnx*sizeof(float));
cudaMalloc(&deta, nnz*nnx*sizeof(float));
cudaMemcpy(vp, v, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(epsilu, e, nnz*nnx*sizeof(float), cudaMemcpyHostToDevice);
cudaMemcpy(deta, d, 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));
if(run_count==0)check_gpu_error2d("Failed to allocate memory for variables!");
get_d02d<<<1, 1>>>(dx_, dz_, nnx, nnz, npd, vp);
initial_coffe2d<<<(nnx+511)/512, 512>>>(dt_,nx,coffx1,coffx2,acoffx1,acoffx2,npd);
initial_coffe2d<<<(nnz+511)/512, 512>>>(dt_,nz,coffz1,coffz2,acoffz1,acoffz2,npd);
printf("--------------------------------------------------------\n");
printf("--- \n");
start = clock();
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%100==0&&is==1)printf("--- is===%d it===%d\n",is,it);
add_source2d<<<1,1>>>(pfac,fs,zs,nx,nz,nnx,nnz,dt_,t,favg_,wtype,npd,is,ds,P,Q);
update_vel2d<<<(nnx*nnz+511)/512, 512>>>(nx,nz,nnx,nnz,npd,dt_,dx_,dz_,u0,w0,u1,w1,P,Q,coffx1,coffx2,coffz1,coffz2);
update_stress2d<<<(nnx*nnz+511)/512, 512>>>(nx,nz,nnx,nnz,dt_,dx_,dz_,u1,w1,P,Q,vp,npd,px1,px0,pz1,pz0,qx1,qx0,qz1,qz0,
acoffx1,acoffx2,acoffz1,acoffz2,deta,epsilu,fs,ds,zs,is,SV);
u0=u1; w0=w1; px0=px1; pz0=pz1; qx0=qx1; qz0=qz1;
shot_record2d<<<(nx+511)/512, 512>>>(nnx, nnz, nx, nz, npd, it, nt_, P, shot_Dev);
if((is==1)&&(it%50==0))
{
cudaMemcpy(e, P, nnz*nnx*sizeof(float), cudaMemcpyDeviceToHost);
fseek(fpsnap,(int)(it/50)*(nnx)*(nnz)*4L,0);
fwrite(e,4L,nnx*nnz,fpsnap);
}
}//it loop end
mute_directwave2d<<<(nx*nt_+511)/512, 512>>>(nx,nt_,dt_,favg_,dx_,dz_,fs,ds,zs,is,vp,epsilu,shot_Dev,100);
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);
}
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(epsilu);
cudaFree(deta);
/***************host free*****************/
free(v); free(e); free(d);
free(shot_Hos);
// exit(0);
}