[tahoe-dev] [tahoe-lafs] #167: try out Jerasure

[tahoe-lafs]

#167: try out Jerasure
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     Reporter:  zooko          |       Owner:  zooko    
         Type:  enhancement    |      Status:  closed   
     Priority:  minor          |   Milestone:  undecided
    Component:  code-encoding  |     Version:  0.6.0    
   Resolution:  fixed          |    Keywords:           
Launchpad_bug:                 |  
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Changes (by zooko):

  * status:  assigned => closed
  * resolution:  => fixed


Comment:

 Prof. James Plank and co-authors (including me) did some good
 investigation about comparative performance:

 http://www.cs.utk.edu/~plank/plank/papers/FAST-2009.html

 The upshot is that zfec is definitely fast enough, and is actually
 competitive with the others in the sense of being consistently fast on
 different machines and different K and M combinations.  The paper doesn't
 show graphs of numbers of check blocks (a.k.a. secondary shares) larger
 than 4, but I think the alternatives get slower with larger numbers of
 secondary shares faster than zfec gets slower.  Also note that Jack Lloyd
 has contributed some code for zfec to use SIMD when appropriate for even
 better performance.  Closing this as "fixed".

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Ticket URL: <http://allmydata.org/trac/tahoe/ticket/167#comment:3>
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