Follow up: I misspoke, the results seem to be deterministic, but vary with core count (or equivalently with fixing max number of threads)
On Thu, Feb 20, 2014 at 3:27 PM, Simon Alexander <[email protected]>wrote: > I've been finding some regressions in registration results when using > systems with different numbers of cores (so the thread count is different). > This is resolved by fixing the global max. > > It's difficult for me to run the identical code on against 4.4.2, but > similar experiments were run in that timeframe without these regressions. > > I recall that there were changes affecting multhreading in the v4 > registration in 4.5.0 release, so I thought this might be a side effect. > > So a few questions: > > Is this behaviour expected? > > Am I correct that this was not the behaviour in 4.4.x ? > > Does anyone who has a feel for the recent changes 4.4.2 -> 4.5.[0,1] > have a good idea where to start looking? I haven't yet dug into the > multithreading architecture, but this "smells" like a data partitioning > issue to me. > > Any other thoughts? > > cheers, > Simon >
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