multithreading in zgbmv subroutine with mkl 10.3

multithreading in zgbmv subroutine with mkl 10.3

Portrait de bouch r.

I'm wondring if the soubroutine zgbmv is multithreaded in mkl, because i test use intel/mkl/64/10.3/2011.5.220 with intel-compiler and i noticed that there is no multithreding in it

I compile with this :

ifort myapp.f -L$BLASDIR -I$INCLUDE -I$INCLUDE/intel64/lp64  $BLASDIR/libmkl_blas95_lp64.a
$BLASDIR/libmkl_lapack95_lp64.a -Wl,--start-group  $BLASDIR/libmkl_intel_lp64.a $BLASDIR/libmkl_intel_thread.a  
$BLASDIR/libmkl_core.a -Wl,--end-group -liomp5 -lpthread -shared-intel -mcmodel=medium -o myapp.e

export MKL_NUM_THREADS=4; ./myapp.e

when i launch the top command and ctrl H, i have one instance of the program intead of four

Thanks in advance

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Portrait de Gennady Fedorov (Intel)
Best Reply

yes, that's right. this routine is not threaded. You can find the list of threaded routines into User's Guide, see section "Threaded Function and Problems"

Portrait de bouch r.

Thanks for your answer!

Portrait de Gennady Fedorov (Intel)

Red, the issue is escalated to the internal database. Here is the number of this issue for your reference - DPD200237620.

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