imkl-10.0.3.020 - Fedora 9 - gcc-4.3.0 - cblas_zgemm

[steven_chung]

Application gets stuck in "cblas_zgemm". Same application, built in Fedora 8, gcc-4.1.2, does not get stuck.

build command: gcc -DCLS=64 -mfpmath=sse -march=core2 -msse3 -D_REENTRANT ...

[TimP]

You say that the change from gcc 4.1 to 4.3 breaks it? If you use g++, this might be expected. Otherwise, if you really need to use gcc 4.3, you may have to get in there and debug, and perhaps file your problem on premier.intel.com, recognizing that Intel doesn't support gcc 4.3 yet.

[steven_chung]

Yes, the following change causes cblas_zgemm to hang:

From: gcc 4.1.2 (gcc version 4.1.2 20070925 (Red Hat 4.1.2-33))
To: gcc 4.3.0 (gcc version 4.3.0 20080428 (Red Hat 4.3.0-8))

Our application is compiled using gcc (not g++). But would you really expect a difference (i.e., #extern "C"{...})?

Is there a debug version of the Intel MKL?

Should we report the problem to "premier.intel.com"?

[steven_chung]

I believe that I have found the answer to this:

1) Dynamic link, and
2) Link must include the -lmkl_sequential

Statically linking using the same *.so libraries for item (1) successfully builds, but hangs (more sleuthing required).