<div dir="ltr">I would try logging the number of incremental and full GCs along with the failures. Just a hunch (the prim might fail for OOM).<div><br></div><div>- Bert -<br><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 7, 2017 at 2:21 PM, Ciprian Teodorov <span dir="ltr"><<a href="mailto:ciprian.teodorov@gmail.com" target="_blank">ciprian.teodorov@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <br><div dir="ltr">interesting I have a similar behavior with your experiment<div>with distance variations globally between 16 and 25</div><div><br></div><div>cheers,</div><div>cip</div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 7, 2017 at 6:51 AM, Ben Coman <span dir="ltr"><<a href="mailto:btc@openinworld.com" target="_blank">btc@openinworld.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <br><div dir="ltr"><br>Try the following experiment.<div>Copy Object>>shallowCopy to Object>>monitorShallowCopy</div><div>and after the pragma add...</div><div>    <span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">  </span>Smalltalk at: #Monitor put: #Failed.</div><div><br></div><div><div><br></div></div><div><div>Then in Playground...</div><div><div>    lastfail := 0.</div><div>    1 to: 100000 do: [ :n |  </div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">     </span>|src copy|</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">    </span>src := Array new: n.</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">  </span>Smalltalk at: #Monitor put: #Succeeded.</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">       </span>copy := src monitorShallowCopy.</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">       </span>(Smalltalk at: #Monitor) == #Failed ifTrue: [</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">         </span>Transcript crShow: n; tab; show: n - lastfail. </div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">              </span>lastfail := n.</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">                </span>].</div><div><span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">    </span>].</div><div><br></div><div>Produces the following interesting result....</div><div><br></div><div>RUN1...</div><div><br></div><div>65559<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">  </span>65559</div><div>67670<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">    </span>2111</div><div>67685<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">     </span>15</div><div>67700<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">       </span>15</div><div>67715<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">       </span>15</div><div>67730<span class="m_-3572118386718512620m_-1223535055506938544gmail-Apple-tab-span" style="white-space:pre-wrap">       </span>15</div><div>...</div></div></div></div></blockquote></div></div></div></blockquote></div></div></div></div>