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<DIV>Matlab’s own copy of BLAS uses 64-bit integers. Ipopt and most other
libraries expect conventional 32-bit integers in BLAS. You need to link Ipopt to
a static-library BLAS to avoid this problem, otherwise there are two
shared-library copies of BLAS opened by the same process using the same function
names but binary-incompatible signatures and bad things happen. You can
alternately tell Matlab to use the same copy of BLAS that you built with Ipopt
by setting BLAS_VERSION environment variables, but this is not well-supported
and could easily slow unrelated linear algebra down if you’re not using an
optimized implementation.</DIV>
<DIV> </DIV>
<DIV>-Tony</DIV>
<DIV> </DIV>
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<DIV style="font-color: black"><B>From:</B> <A title=j.a.e.andersson@gmail.com
href="mailto:j.a.e.andersson@gmail.com">Joel Andersson</A> </DIV>
<DIV><B>Sent:</B> Wednesday, January 14, 2015 3:40 AM</DIV>
<DIV><B>To:</B> <A title=ipopt@list.coin-or.org
href="mailto:ipopt@list.coin-or.org">Ipopt - Mailing list</A> </DIV>
<DIV><B>Subject:</B> [Ipopt] IPOPT build causes crash inside
MATLAB</DIV></DIV></DIV>
<DIV> </DIV></DIV>
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<DIV dir=ltr>Hello all,
<DIV> </DIV>
<DIV>I am working on adding a MATLAB front-end to CasADi that will enable
formulating and solving large-scale NLPs with efficient automatic calculation of
Jacobians and Hessians.</DIV>
<DIV> </DIV>
<DIV>I am experiencing problems of getting our IPOPT plugin to work inside
MATLAB. While it appears to work fine in OS X, I get segfaults in Linux (Ubuntu
14.04, 64-bit, gcc 4.7) with the following stack trace:</DIV>
<DIV> </DIV>
<DIV>
<DIV>Stack Trace (from fault):</DIV>
<DIV>[ 0] 0x00007f607282eb0c
/usr/local/MATLAB/R2014b/bin/glnxa64/mkl.so+31877900
mkl_blas_cnr_def_xdcopy+00000252</DIV>
<DIV>[ 1] 0x00007f6070ca3778
/usr/local/MATLAB/R2014b/bin/glnxa64/mkl.so+02996088
mkl_blas_dcopy+00000200</DIV>
<DIV>[ 2] 0x00007f6070b1381c
/usr/local/MATLAB/R2014b/bin/glnxa64/mkl.so+01357852 dcopy+00000080</DIV>
<DIV>[ 3]
0x00007f6074f76565
/usr/local/lib/libipopt.so.0+01639781
_ZN5Ipopt11IpBlasDcopyEiPKdiPdi+00000085</DIV>
<DIV>[ 4]
0x00007f6074e65762
/usr/local/lib/libipopt.so.0+00522082
_ZN5Ipopt11TNLPAdapter16GetStartingPointENS_8SmartPtrINS_6VectorEEEbS3_bS3_bS3_bS3_b+00001106</DIV>
<DIV>[ 5]
0x00007f6074ebdc78
/usr/local/lib/libipopt.so.0+00883832
_ZN5Ipopt15GradientScaling30DetermineScalingParametersImplENS_8SmartPtrIKNS_11VectorSpaceEEES4_S4_NS1_IKNS_11MatrixSpaceEEES7_NS1_IKNS_14SymMatrixSpaceEEERKNS_6MatrixERKNS_6VectorESD_SG_RdRNS1_ISE_EESJ_SJ_+00000232</DIV></DIV>
<DIV>...</DIV>
<DIV> </DIV>
<DIV>Anyone has any idea of what could be the cause of this or how it can be
resolved? It appears to be related to BLAS which I find perplexing since IPOPT
is not linked to the MEX function, but to a plugin (shared library) which is
loaded dynamically using dlopen(..., RTLD_LAZY | RTLD_LOCAL). I thought that
would provide enough encapsulation to avoid problems like this.</DIV>
<DIV> </DIV>
<DIV>I tried building IPOPT explicitly avoid MKL blas by setting
"--with-build=BUILD --with-lapack=BUILD":</DIV>
<DIV> </DIV>
<DIV>../configure --prefix=/usr/local --with-build=BUILD --with-lapack=BUILD
ADD_FFLAGS=-fPIC ADD_CFLAGS=-fPIC ADD_CXXFLAGS=-fPIC<BR></DIV>
<DIV> </DIV>
<DIV>But that doesn't appear to have any effect.<BR></DIV>
<DIV> </DIV>
<DIV>Best regards and thanks in advance,</DIV>
<DIV>Joel</DIV>
<DIV> </DIV>
<DIV>
<DIV class=gmail_signature> </DIV></DIV></DIV>
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