Have you built Sage from source? If not, it could happen, in principle, that lapack/atlas/blas shipped do not quite work on your system...
If you built it from source, did you do anything special to build Atlas in particular? You can also try building csdp completely separately from Sage, using Ubuntu system-supplied libraries, and see whether theta works. Namely, you can clone it from https://github.com/dimpase/csdp and build as described on that page. Sorry for not being able to help more, but as long we cannot reproduce the error, it's hard to tell what exactly is wrong. And of course you can use gdb to debug theta - for this you need to make sure it's compiled with right switches, of course... On Wednesday, May 11, 2016 at 2:50:30 PM UTC+1, Sihuang Hu wrote: > > Yes, it still works on many other graphs. > > --------------------------------------------------------------------------------------------------------------------------- > (sage-sh) shhu@shhu-ee-tau:~$ ldd `which theta` > linux-vdso.so.1 => (0x00007ffea69d6000) > libsdp.so.0 => /home/shhu/Documents/SageMath/local/lib/libsdp.so.0 > (0x00007f9e721e9000) > liblapack.so.3 => > /home/shhu/Documents/SageMath/local/lib/liblapack.so.3 (0x00007f9e71907000) > libcblas.so.3 => /home/shhu/Documents/SageMath/local/lib/libcblas.so.3 > (0x00007f9e716e3000) > libf77blas.so.3 => > /home/shhu/Documents/SageMath/local/lib/libf77blas.so.3 (0x00007f9e714c2000) > libatlas.so.3 => /home/shhu/Documents/SageMath/local/lib/libatlas.so.3 > (0x00007f9e70e91000) > libgfortran.so.3 => > /home/shhu/Documents/SageMath/local/lib/libgfortran.so.3 > (0x00007f9e70b73000) > libquadmath.so.0 => > /home/shhu/Documents/SageMath/local/lib/libquadmath.so.0 > (0x00007f9e70936000) > libm.so.6 => /lib/x86_64-linux-gnu/libm.so.6 (0x00007f9e70615000) > libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f9e7024f000) > libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 > (0x00007f9e70031000) > libgcc_s.so.1 => /home/shhu/Documents/SageMath/local/lib/libgcc_s.so.1 > (0x00007f9e6fe1b000) > /lib64/ld-linux-x86-64.so.2 (0x00005609d1eac000) > > ------------------------------------------------------------------------------------------------------------------------------ > The CSDP log is attached. > > Thanks for your kindly help! > > 在 2016年5月11日星期三 UTC+3下午4:43:04，Dima Pasechnik写道： >> >> It does work on some graphs, still, right? >> It's a high-end relatively new CPU, perhaps Atlas and/or gcc has a >> problem with it? >> >> Can you post the output of 'ldd theta', i.e. >> >> (sage-sh) dimpase@clpc171:sage$ ldd `which theta` >> linux-vdso.so.1 (0x00007ffd2c34f000) >> libsdp.so.0 => /home/scratch/dimpase/sage/sage/local/lib/libsdp.so.0 >> (0x00007f74f6ec3000) >> liblapack.so.3 => >> /home/scratch/dimpase/sage/sage/local/lib/liblapack.so.3 >> (0x00007f74f65fc000) >> libcblas.so.3 => /home/scratch/dimpase/sage/sage/local/lib/libcblas.so.3 >> (0x00007f74f63da000) >> libf77blas.so.3 => >> /home/scratch/dimpase/sage/sage/local/lib/libf77blas.so.3 >> (0x00007f74f61b8000) >> libatlas.so.3 => /home/scratch/dimpase/sage/sage/local/lib/libatlas.so.3 >> (0x00007f74f5b2a000) >> libgfortran.so.3 => /lib64/libgfortran.so.3 (0x00007f74f57ca000) >> libquadmath.so.0 => /lib64/libquadmath.so.0 (0x00007f74f558b000) >> libm.so.6 => /lib64/libm.so.6 (0x00007f74f5288000) >> libc.so.6 => /lib64/libc.so.6 (0x00007f74f4ec7000) >> libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f74f4caa000) >> libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f74f4a92000) >> /lib64/ld-linux-x86-64.so.2 (0x000055f7fadea000) >> >> as well as the CSDP installation log: >> >> SAGE_ROOT/logs/pkgs/csdp-6.2.log >> >> On Wednesday, May 11, 2016 at 12:58:43 PM UTC+1, Sihuang Hu wrote: >>> >>> I just did what you suggested, and it didn't work. I got those messages: >>> >>> (sage-sh) shhu@shhu-ee-tau:~$ theta 2k2 >>> Segmentation fault (core dumped) >>> >>> My Cpu information is attached. >>> Ubuntu 14.04LTS >>> SageMath Version 7.0, Release Date: 2016-01-19 >>> >>> >>> 在 2016年5月10日星期二 UTC+3下午11:55:55，Dima Pasechnik写道： >>>> >>>> here is the input for theta executable: >>>> >>>> 4 >>>> 2 >>>> 1 2 >>>> 3 4 >>>> >>>> (also attached) >>>> save it to a file named, say, 2k2, fire up "sage -sh" >>>> and run >>>> >>>> theta 2k2 >>>> >>>> I get >>>> >>>> $ theta 2k2 >>>> Graph is of size 4 2 >>>> C block 1, blocksize, 4 >>>> Checking constraint 1 >>>> Checking constraint 2 >>>> Checking constraint 3 >>>> Iter: 0 Ap: 0.00e+00 Pobj: 1.0666667e+02 Ad: 0.00e+00 Dobj: >>>> 0.0000000e+00 >>>> [... edited] >>>> Iter: 15 Ap: 1.00e+00 Pobj: 2.0000000e+00 Ad: 9.00e-01 Dobj: >>>> 2.0000000e+00 >>>> Success: SDP solved >>>> Primal objective value: 2.0000000e+00 >>>> Dual objective value: 2.0000000e+00 >>>> Relative primal infeasibility: 1.11e-16 >>>> Relative dual infeasibility: 2.12e-10 >>>> Real Relative Gap: 8.56e-10 >>>> XZ Relative Gap: 9.63e-10 >>>> DIMACS error measures: 1.11e-16 0.00e+00 5.30e-10 0.00e+00 8.56e-10 >>>> 9.63e-10 >>>> The Lovasz Theta Number is 2.0000000e+00 >>>> >>>> Does this work for you? >>>> >>>> -- You received this message because you are subscribed to the Google Groups "sage-support" group. 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