[Scipy-tickets] [SciPy] #1036: Big performance drop on dense matrices between versions.

SciPy Trac scipy-tickets@scipy....
Sat Dec 11 18:57:55 CST 2010


#1036: Big performance drop on dense matrices between versions.
----------------------------------+-----------------------------------------
  Reporter:  alambe               |       Owner:  wnbell
      Type:  defect               |      Status:  closed
  Priority:  normal               |   Milestone:  0.9.0 
 Component:  scipy.sparse.linalg  |     Version:  0.7.0 
Resolution:  invalid              |    Keywords:        
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Changes (by pv):

  * status:  new => closed
  * resolution:  => invalid


Comment:

 This is probably because in 0.6, GMRES defaults to restart every `n`
 iterations, whereas in 0.7 the default is 20. The default is to adjust the
 `restrt` (or nowadays `restart`) parameter according to the need.

 Anyway, if GMRES needs a large restart parameter to work, using a dense
 solver is probably a better idea.

-- 
Ticket URL: <http://projects.scipy.org/scipy/ticket/1036#comment:4>
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