[Networkit] new core decomposition algorithm

Christian Staudt christian.staudt at kit.edu
Sun Oct 4 16:42:46 CEST 2015


I have a suspicion why my measurements could be wrong. Let me investigate, I’ll report new results when I have a solution.
Chris

On 03 Oct 2015, at 21:22, Christian Staudt <christian.staudt at kit.edu> wrote:

> 
> On 17 Sep 2015, at 14:51, Henning Meyerhenke <henning.meyerhenke at kit.edu> wrote:
> 
>> Some additional measurements on phipute1 show that the new implementation with Max's thread local buffers is clearly faster (a factor of 5 is typical) than the old one.
> 
> Well, this is not the picture I get from my recent benchmark on 13 complex networks. It shows (at least as clearly) that the new algorithm is on average slower with a large variance towards the slow side.
> 
> See for yourself in the attached plots: Speed is measures in edges per second (dividing the graph size by the running time), averaged over 4 runs and aggregated over the set of graphs.
> 
> 
> new (parallel):
> 
> <epsSummary.pdf>
> <CoreDecomposition (nk)-eps.pdf>
> <CoreDecomposition (nk)-time.pdf>
> 
> old (sequential): 
> 
> <epsSummary-old.pdf>
> <CoreDecomposition (nk)-eps-old.pdf>
> <CoreDecomposition (nk)-time-old.pdf>
> What is going on here? 
> 
> Chris
> 
> 
> 
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