User Tools

Site Tools


faq:cholesky_decomp_failed

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revisionPrevious revision
Next revisionBoth sides next revision
faq:cholesky_decomp_failed [2015/12/14 20:02] oschuettfaq:cholesky_decomp_failed [2015/12/14 20:03] oschuett
Line 32: Line 32:
 This says that CP2K failed to compute a Cholesky decomposition during the construction of the preconditioner for OT. Most likely, the overlap matrix (S) has become singular (or at least numerically close to singular).  Here are some causes / possible solutions: This says that CP2K failed to compute a Cholesky decomposition during the construction of the preconditioner for OT. Most likely, the overlap matrix (S) has become singular (or at least numerically close to singular).  Here are some causes / possible solutions:
  
-  * Try some of the other [[https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/SCF/OT.html#PRECONDITIONER|PRECONDITIONER]] options, which may prove to be more stable for your system. +  * Try some of the other [[inp>FORCE_EVAL/DFT/SCF/OT#PRECONDITIONER|PRECONDITIONER]] options, which may prove to be more stable for your system. 
-  * Decrease the value of [[https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/QS.html#list_EPS_DEFAULT|EPS_DEFAULT]] or [[https://manual.cp2k.org/trunk/CP2K_INPUT/FORCE_EVAL/DFT/QS.html#list_EPS_PGF_ORB|EPS_PGF_ORB]], to reduce the amount of numerical noise in the construction of S. +  * Decrease the value of [[inp>FORCE_EVAL/DFT/QS#list_EPS_DEFAULT|EPS_DEFAULT]] or [[inp>FORCE_EVAL/DFT/QS#list_EPS_PGF_ORB|EPS_PGF_ORB]], to reduce the amount of numerical noise in the construction of S. 
-  * Check carefully that the Basis Set(s) chosen for your calculation are appropriate for the system.  If the basis set is overcomplete this could result in a singular overlap matrix - try switching to a smaller basis set.+  * Check carefully that the Basis Set(s) chosen for your calculation are appropriate for the system.  If the basis set is over-complete this could result in a singular overlap matrix - try switching to a smaller basis set.
faq/cholesky_decomp_failed.txt · Last modified: 2020/08/21 10:15 by 127.0.0.1