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[Chareyre <729079@xxxxxxxxxxxxxxxxxx>]

On 216k bodies (N=50 in Sergei's script) and 3 threads, the total
speedup is x1.75!
The collider speedup is x3.5, but more time is spent in interactions
(since verletDist is higher): x0.72 speed-down.
Performance should be even better with more threads, since the
collider/dispatcher are better balanced (50/50 with 3 threads).
I'm currently testing 4 threads.

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https://bugs.launchpad.net/bugs/729079

Title:
  Performance optimization of InsertionSortCollider

Status in Yet Another Dynamic Engine:
  New

Bug description:
  Sergei Dorofeenko  (https://launchpad.net/~sergei.dorofeenko) found,
  that InsertionSortCollider is probably is a "bottle neck" in
  simulations with >10^5 number of particles even in many-threads mode.

  http://www.mail-archive.com/yade-dev@xxxxxxxxxxxxxxxxxxx/msg06573.html

  Сitation:
  "...I did a perfomance test for parallel mode and results in no good.

  Performance boost only about 40% from 1 thread to 4 thread for 200k
  particles... Cause is a non-parallelised InsertionSortCollider, who
  need about 80% time with 4 threads.

  Results attached."