https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/64bit-problem-with-mkl-blas-dgemm-zgesvd/m-p/903160#M11440 Hi,<BR /><BR />I am having a problem with code that worked well on the IA32 platform. Nothing has changed except that I am now on EMT64 (Xeon 5050). I am therefore reluctant to believe it is the code (which is very straightforward).<BR /><BR />I am using Intel MKL 8.1 on Linux.<BR /><BR />I have some code to do an SVD of a matrix. When this matrix is smallish (e.g. 16x3), the code works fine. When the matrix gets bigger, (e.g. 163x3) the code seg. faults and examining the core gives the following error:<BR /><BR />Loaded symbols for /opt/intel/mkl/8.1/lib/em64t/libmkl_p4n.so<BR />#0 0x00002aaaac91bf19 in mkl_blas_dgemm_pst () from /opt/intel/mkl/8.1/lib/em64t/libmkl_p4n.so<BR /><BR />The crash actually happens in a call to ZBDSQR and reports a segmentation fault with mkl_blas_dgemm_pst().<BR /><BR />I am linking against the version of "libguide.so" that comes with the MKL. The code also uses "libimf.so" which doesn't come with the MKL, I am using the version that comes with the Intel C++ compiler, 9.1.044.<BR /><BR />Other people have reported a similar bug when calling ZGESVD which, since it's only a driver routine, may be having the same problem.<BR /><BR />Any suggestions?<BR /><BR />Thanks,<BR /><BR />Greg<BR /> Mon, 30 Oct 2006 01:20:49 GMT gmr001 2006-10-30T01:20:49Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/64bit-problem-with-mkl-blas-dgemm-zgesvd/m-p/903160#M11440 Hi,<BR /><BR />I am having a problem with code that worked well on the IA32 platform. Nothing has changed except that I am now on EMT64 (Xeon 5050). I am therefore reluctant to believe it is the code (which is very straightforward).<BR /><BR />I am using Intel MKL 8.1 on Linux.<BR /><BR />I have some code to do an SVD of a matrix. When this matrix is smallish (e.g. 16x3), the code works fine. When the matrix gets bigger, (e.g. 163x3) the code seg. faults and examining the core gives the following error:<BR /><BR />Loaded symbols for /opt/intel/mkl/8.1/lib/em64t/libmkl_p4n.so<BR />#0 0x00002aaaac91bf19 in mkl_blas_dgemm_pst () from /opt/intel/mkl/8.1/lib/em64t/libmkl_p4n.so<BR /><BR />The crash actually happens in a call to ZBDSQR and reports a segmentation fault with mkl_blas_dgemm_pst().<BR /><BR />I am linking against the version of "libguide.so" that comes with the MKL. The code also uses "libimf.so" which doesn't come with the MKL, I am using the version that comes with the Intel C++ compiler, 9.1.044.<BR /><BR />Other people have reported a similar bug when calling ZGESVD which, since it's only a driver routine, may be having the same problem.<BR /><BR />Any suggestions?<BR /><BR />Thanks,<BR /><BR />Greg<BR /> Mon, 30 Oct 2006 01:20:49 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/64bit-problem-with-mkl-blas-dgemm-zgesvd/m-p/903160#M11440 gmr001 2006-10-30T01:20:49Z https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/64bit-problem-with-mkl-blas-dgemm-zgesvd/m-p/903161#M11441 Did you try increasing the stack size? How this is done depends on which shell you run.<BR /> Mon, 30 Oct 2006 03:51:13 GMT https://community.intel.com/t5/Intel-oneAPI-Math-Kernel-Library/64bit-problem-with-mkl-blas-dgemm-zgesvd/m-p/903161#M11441 TimP 2006-10-30T03:51:13Z