<div dir="ltr">Follow up: I misspoke, the results seem to be deterministic, but vary with core count (or equivalently with fixing max number of threads)<div class="gmail_extra"><br><br><div class="gmail_quote">On Thu, Feb 20, 2014 at 3:27 PM, Simon Alexander <span dir="ltr"><<a href="mailto:skalexander@gmail.com" target="_blank">skalexander@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">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.<div>
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<div>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.</div><div><br></div><div>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.</div>
<div><br></div><div>So a few questions:</div><div><br></div><div>Is this behaviour expected? </div><div><br></div><div>Am I correct that this was not the behaviour in 4.4.x ?</div><div><br></div><div>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.</div>
<div><br></div><div>Any other thoughts?</div><div><br></div><div>cheers,</div><div>Simon</div></div>
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