yade-dev team mailing list archive

[Anton Gladky <729079@xxxxxxxxxxxxxxxxxx>]

I have implemented "pre-sorting" algorithm, which starts in parallel mode.
The "clean" sorting is done in 1-thread mode. 

https://code.launchpad.net/~yade-dev/yade/insertion-sort-test

The benefit is about  20% of time on artificial tests. We'll see, how it
will work in real work.

To test it, you just need to checkout the pointed branch and then
"./build.py".

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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."