func Init() {
flag.Parse()
log.SetPrefix("")
log.SetFlags(0)
if *Flag_silent {
log.SetOutput(devnul{})
}
if *Flag_version {
log.Print("Mumax Cubed 0.1α ", runtime.GOOS, "_", runtime.GOARCH, " ", runtime.Version(), "(", runtime.Compiler, ")", "\n")
}
if *Flag_od != "" {
SetOD(*Flag_od, *Flag_force)
}
if *Flag_maxprocs == 0 {
*Flag_maxprocs = runtime.NumCPU()
}
procs := runtime.GOMAXPROCS(*Flag_maxprocs) // sets it
log.Println("gomaxprocs:", procs)
prof.Init(OD)
cuda.Init()
cuda.LockThread()
}
func main() {
cuda.Init()
N0, N1, N2 := 1, 64, 128
c := 1.
mesh := data.NewMesh(N0, N1, N2, c/2, c*2, c)
m := cuda.NewSlice(3, mesh)
conv := cuda.NewDemag(mesh)
cuda.Memset(m, 1, 1, 1)
B := cuda.NewSlice(3, mesh)
Bsat := 1.
vol := data.NilSlice(1, mesh)
conv.Exec(B, m, vol, Bsat)
out := B.HostCopy()
bx := out.Vectors()[0][N0/2][N1/2][N2/2]
by := out.Vectors()[1][N0/2][N1/2][N2/2]
bz := out.Vectors()[2][N0/2][N1/2][N2/2]
fmt.Println("demag tensor:", bx, by, bz)
check(bx, -1)
check(by, 0)
check(bz, 0)
fmt.Println("OK")
}
func main() {
cuda.Init()
N0, N1, N2 := 16, 16, 16
c := 1.
mesh := data.NewMesh(N0, N1, N2, c, c, c)
m := cuda.NewSlice(3, mesh)
conv := cuda.NewDemag(mesh)
mhost := m.HostCopy()
m_ := mhost.Vectors()
r := float64(N2) / 2
for i := 0; i < N0; i++ {
x := c * (float64(i) + 0.5 - float64(N0)/2)
for j := 0; j < N1; j++ {
y := c * (float64(j) + 0.5 - float64(N1)/2)
for k := 0; k < N2; k++ {
z := c * (float64(k) + 0.5 - float64(N2)/2)
if x*x+y*y+z*z < r*r {
m_[0][i][j][k] = 1
m_[1][i][j][k] = 2
m_[2][i][j][k] = 3
}
}
}
}
data.Copy(m, mhost)
B := cuda.NewSlice(3, mesh)
conv.Exec(B, m, data.NilSlice(1, mesh), 1)
out := B.HostCopy()
bx := out.Vectors()[0][N0/2][N1/2][N2/2]
by := out.Vectors()[1][N0/2][N1/2][N2/2]
bz := out.Vectors()[2][N0/2][N1/2][N2/2]
fmt.Println("demag tensor:", bx, by/2, bz/3)
check(bx, -1./3.)
check(by, -2./3.)
check(bz, -3./3.)
fmt.Println("OK")
}