I have below code to use LAPACK in visual fortran compiler. But it gives the 'error #6930: The size of the array dimension is too large, and overflow occured when computing the array size '.
program deneme implicit none integer I,J,N,M,NRHS, INFO, LWORK, BLOCKSIZE parameter (M=90001, N=6000, NRHS=1, BLOCKSIZE=16, LWORK=N+M*BLOCKSIZE) double precision A(M,N), B(M,NRHS), WORK(LWORK) open(unit=10, file='C:\Users\Murat\Desktop\u3.txt') read(10,*) ((A(I,J),J=1,N),I=1,M) close (10) open(unit=11, file='C:\Users\Murat\Desktop\bdeneme.txt') read (11,*) ((B(I,J),J=1,NRHS), I=1,M) close(11) call dgels('No transpose', M,N,NRHS,A,M,B,M,WORK,LWORK,INFO) open(unit=12, file='C:\Users\Murat\Desktop\result.txt') do I=1,N do J=1,NRHS write (12,*) B(I,J) end do end do close(12) end program deneme
it would help to make the data array allocatable (heap instead of stack). You might need to add in the linker '/LARGEADDRESSAWARE'.
program array_dim use, intrinsic :: ISO_FORTRAN_ENV, only : real64 implicit none ! Variables integer, parameter :: M=90001, N=6000 !real(real64) :: my_array(M,N) real(real64), allocatable :: my_array(:,:) allocate(my_array(M,N)) ! Body of array_dim print *, 'Hello World' end program array_dim
the solution of Johannes will not work if you create a 32-bit version.
Your array A is of size(90001,6000). This are 90001*6000*8 bytes = 4,023 GB (one double precision value has 8 bytes) . A 32 bit program can use max. 2 GB. Using /LARGEADDRESSAWRE gives you 3 GB on 32 bit windows and 4 GB on 64 bit windows. And you have to consider that your program and the other arrays and variables need some space too.
To use such large arrays you have to build a 64 bit version of your program. The 64 bit version doesn't need then linker option /LARGEADDRESSAWARE
Thank you for answers.
My computer has 64 bit operating system but intel files are in programfiles(x86). How can I change my code to work as 64 bit?
It doesn't matter where the Intel files are.
If you are using Visual Studio, select Build > Configuration Manager. Under "Active Solution Platform" select <New...> Change the new platform to "x64" and click OK. Now you are configured to build a 64-bit application.
If you are using the command line, start your command prompt session with the Intel-installed shortcut for "Compiler xx.x for Intel 64 ...:"
The buildlog explains. "catastrophic error: Variable DENEME$A too large for NTCOFF. Bigger than 2GB. Use heap instead"
The allocatable shown at post #2 will put the arrays on the heap. An alternative is the heap arrays option..
So was my thought/ understanding of the heap-array option also: /heap-array0 should work for x64. But it doesn't:
Build Log Build started: Project: array_dim, Configuration: Debug|x64 Output Deleting intermediate files and output files for project 'array_dim', configuration 'Debug|x64'. Compiling with Intel(R) Visual Fortran Compiler 18.104.22.168 [Intel(R) 64]... ifort /nologo /debug:full /Od /heap-arrays0 /warn:interfaces /module:"x64\Debug\\" /object:"x64\Debug\\" /Fd"x64\Debug\vc140.pdb" /traceback /check:bounds /check:stack /libs:dll /threads /dbglibs /c /Qlocation,link,"C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC\\bin\amd64" /Qm64 "D:\02_Fortran\99_test\array_dim\array_dim.f90" x64\Debug\array_dim.obj: catastrophic error: Variable ARRAY_DIM$MY_ARRAY too large for NTCOFF. Bigger than 2GB. Use heap instead compilation aborted for D:\02_Fortran\99_test\array_dim\array_dim.f90 (code 1) array_dim - 1 error(s), 0 warning(s)
This is the result of the code from #2 with static array definition (line 7 un-commented, line 8 + 10 commented). Shouldn't it work this way?
/heap-array is used only for temporary copies and "automatic arrays" (procedure local arrays with dimensions based on dummy arguments). It doesn't affect regular variables you declare.
Hi Steve, thanks for clarification. So, the only way to work with large arrays >= 2 GB is to make them allocatable, if I understand it correctly.
Without testing, I've seen that you mix single with double precision. A and B are defined as single (real, allocatable instead of real(real64), allocatable, compare with #2 line 8). Then you call *gels as double precision version (dgels). The interface cannot be checked by the compiler, because you have an implicit interface. A segfault is the result.
Compare this blog topic for interfaces: https://software.intel.com/en-us/blogs/2012/01/05/doctor-fortran-gets-explicit-again
And for precision this: https://software.intel.com/en-us/blogs/2017/03/27/doctor-fortran-in-it-takes-all-kinds
Hi, the first figure you attached contains the old, single precision version as Andrew said. Are you sure you changed it to double precision?
This one works for me including debug:
program array_dim use, intrinsic :: ISO_FORTRAN_ENV, only : real64 USE lapack95, ONLY: GELS implicit none ! Variables !integer, parameter :: M=90001, N=6000, NRHS=1 integer, parameter :: M=90, N=60, NRHS=1 real(real64), allocatable :: A(:,:), B(:,:) ! Local Scalars INTEGER :: I, J, INFO allocate(A(M,N)) allocate(B(M,NRHS)) CALL RANDOM_SEED() CALL RANDOM_NUMBER(A) CALL RANDOM_NUMBER(B) CALL GELS( A, B(:,1), 'T', INFO ) end program array_dim
Don't forget to add /Qmkl:parallel in compiler setting and e.g. mkl_lapack95_ilp64.lib and include path in linker settings. By inserting the 'use lapack95, only:GELS' you enables the compiler to make interface checking (explicit f90 interface for lapack).
I am very newbie to(dummiest) use fortran. I have program that's written using fortran 77 with the extension file *.f If I worked with larga data, it will be error and it said, catastrophic error ... > 2GB Use heap instead compilation.... I am using intel fortran compiler in windows 10 64 bit. I am confuse to use the heap, do we need to change the code or using command line and/or setting in visual studio. I tried to use command prompt intel fortran compiler: ifort filename filename /link. Is there command that I can use to execute the files without error. Or I have to modify the code, here some code of program that I used
Windows has a hard 2GB limit for static code and data. You don't show where you declare an array with "large data", but if it is really large you will run out of available address space, even if you build for 64-bit. The suggestion to use the heap applies if you are building for 64-bit. Then you can declare arrays as ALLOCATABLE, DIMENSION(:) and ALLOCATE them to the desired size in the main program. There is no compiler option that will magically do this for you.
See https://software.intel.com/en-us/articles/memory-limits-applications-windows for more information.
Beginners do not usually write or attempt to run programs that involve over 2GB of data. I suspect that the error message is caused by an understandable, but incorrect diagnosis of your source code, which possibly contains a simple typographical error. Consider one of the COMMON block declarations in your code:
common/csit2/xs2, *ana,anm,anws,anw,ans,air *aina,ainm,ainws,ainw,ains,aiir,beta
You probably intended to have AIR and AINA as separate variables but, because no ',' was typed after AIR, the declaration is seen by the compiler as
If your code assigns values to AIR and AINA but not AIRAINA, and the variables in the CSIT2 block are used elsewhere, incorrect (undefined) values will be used.