BUGS.txt

Known bugs & issues

These show up when using testing run_tests.py --tol 100.


Jan 2016
[cz]heevr                               -- accuracy failures, xerbla errors
Fails when computing only eigenvalues (jobz=N).
Under investigation.


Jan 2016
[sdcz]geqlf, geqrf, lange, larfb, gesdd, gesvd  --  accuracy failures
Several routines fail accuracy tests for very tall or very wide matrices
(e.g., -N 2000000,10 -N 10,2000000). These may simply be not normalized correctly.  
Under investigation.


Jan 2016
[sdcz]geqr2x_gpu --version 2 and 4      --  accuracy failures
Fail orthogonality checks, |I - Q^H*Q|.
Under investigation


Aug 2015
[sdcz]trsm_batched                      --  accuracy failures
These result from badly conditioned triangular matrices.
The tester needs to be updated to take the conditioning into account in the check.


Aug 2015
[s c ]geqrf_batched                     --  transient NAN failures
Occasionally gets NaN results, possibly due to race condition.
Under investigation.


Aug 2015
[sdcz]sy/hemm_mgpu                      --  tester incompatability
The tester needs to be updated to match the routine; currently disabled.
Update Jan 2015:                        --  accuracy failures
The tester has been updated. Results fail on some GPUs, for some offsets.
It does not appear to affect the eigenvalue routines where it is used.


Aug 2015
[sd  ]gegqr_gpu --version 3             --  MGS accuracy failure, N=95
[sd  ]gegqr_gpu --version 4             --  Cholesky QR fails (not SPD), N=95
These occur for the same matrix, so are probably related to a deficiency, e.g.,
poor conditioning, in that matrix.
Under investigation.