Arrays Fortran 90-“;分段故障-无效内存引用“;具有可扩展的3D阵列
我用gfortran编译了一个fortran 90程序,它以我想要的方式构建了一个可伸缩的3D阵列。运行时,出现以下错误:Arrays Fortran 90-“;分段故障-无效内存引用“;具有可扩展的3D阵列,arrays,segmentation-fault,fortran,fortran90,gfortran,Arrays,Segmentation Fault,Fortran,Fortran90,Gfortran,我用gfortran编译了一个fortran 90程序,它以我想要的方式构建了一个可伸缩的3D阵列。运行时,出现以下错误: Program received signal SIGSEGV: Segmentation fault - invalid memory reference. Backtrace for this error: #0 0x10542ee42 #1 0x10542f60e #2 0x7fff8d7895a9 #3 0x10542575e #4 0x10542597
Program received signal SIGSEGV: Segmentation fault - invalid memory reference.
Backtrace for this error:
#0 0x10542ee42
#1 0x10542f60e
#2 0x7fff8d7895a9
#3 0x10542575e
#4 0x105425975
#5 0x105425d0e
Segmentation fault: 11
我相信这是一个大型3D阵列的内存问题,因为如果我减小尺寸,它会工作,但是有没有办法解决这个问题?这是我的密码:
PROGRAM phantomtest
IMPLICIT NONE
INTEGER, PARAMETER:: columns=34, rows=34, diags=((4*columns)-6), m=(4*columns)-6+(2*columns)
REAL, ALLOCATABLE, DIMENSION(:,:,:)::phantom
INTEGER :: i, j, k
CHARACTER (LEN=3) :: nstring, nullstring=''
ALLOCATE(phantom(columns,rows,m))
phantom=0
CALL Phantom_Making(phantom,columns,rows,diags,m)
WRITE(nstring,FMT="(I3)"), columns
PRINT*, nullstring
DO k=1,m
DO i=1,columns
WRITE(*,FMT="("//nstring//"I2)") phantom(i,:,k)
END DO
PRINT *, nullstring
END DO
END PROGRAM phantomtest
!---------------------------
SUBROUTINE Phantom_Making(phantom,columns,rows,diags,m)
IMPLICIT NONE
INTEGER, INTENT(IN):: columns, rows, diags, m
REAL, DIMENSION(columns,rows,m), INTENT(INOUT) :: phantom
INTEGER :: i, j, k, l
!Vertical and horizontal rays
DO i=1,rows
phantom(:,i,i) = 1
phantom(i,:,i+(columns)+(diags/2)) = 1
END DO
!Diagonal rays
phantom(1,2,1+columns) = 1
phantom(2,1,1+columns) = 1
phantom(1,columns-1,1+columns+(diags/2)+rows) = 1
phantom(2,columns,1+columns+(diags/2)+rows) = 1
j = columns-1
DO k=2+columns, (diags/2)+columns
phantom(2:columns,:,k) = phantom(1:(columns-1),:,k-1)
IF (((k+1)-columns).LE.columns) phantom(1,k+1-columns,k)=1
END DO
DO l=columns+(diags/2)+rows+2, columns+(diags/2)+rows+1+(diags/2)
j = j-1
phantom(2:columns,:,l) = phantom(1:(columns-1),:,l-1)
IF (j.GT.0) phantom(1,j,l) = 1
END DO
END SUBROUTINE
许多编译器的检查可以帮助您进行调试。例如,gfortran:
gfortran -g -fcheck=all -Wall segf.f90
segf.f90:5.17:
INTEGER :: i, j, k
1
Warning: Unused variable 'j' declared at (1)
~/f/testy/stackoverflow> ./a.out
At line 50 of file segf.f90
Fortran runtime error: Index '199' of dimension 3 of array 'phantom' outside of expected range (1:198)
其他编译器也有类似的选项
循环在l
的值上运行,您正在访问数组phantom
越界
确保
l
具有正确的值,1:m
,或者数组幻像的尺寸正确指定为该范围(1:m
)。如果使用-g
编译器选项,回溯更有意义。