<html><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">This is probably a result of conservatism for references from thread stacks which results in spurious retention. It may be necessary to be more careful about what references are held on the stack in the threads implementation (and elsewhere in your code). Until we diagnose the place where objects are being retained it will be hard to pinpoint. You should realize that weak refs are a problem in many language implementations, not just Modula-3. I look forward to hearing more definitively from you.<br><div><br><div> <span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; border-spacing: 0px 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; text-align: auto; -khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; 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-khtml-text-decorations-in-effect: none; text-indent: 0px; -apple-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div><font class="Apple-style-span" color="#0000FF"><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; "><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; ">Antony Hosking</span></span></font></font><font class="Apple-style-span" face="Gill Sans"><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "> | </span></span><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; ">Associate Professor</span></span><span class="Apple-style-span" style="font-family: Gill Sans; "><span class="Apple-style-span" style="font-family: Gill Sans; "> | Computer Science | Purdue University</span></span></font></div><div><font class="Apple-style-span" face="GillSans-Light"><span class="Apple-style-span" style="font-family: GillSans-Light; ">305 N. University Street | West Lafayette | IN 47907 | USA</span></font></div><div><font class="Apple-style-span" color="#0000FF" face="Gill Sans"><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; "><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; ">Office</span></span></font><font class="Apple-style-span" face="GillSans-Light"><span class="Apple-style-span" style="font-family: GillSans-Light; "><span class="Apple-style-span" style="font-family: GillSans-Light; "> +1 765 494 6001 | </span></span></font><font class="Apple-style-span" color="#0000FF" face="Gill Sans"><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; "><span class="Apple-style-span" style="color: rgb(0, 0, 255); font-family: Gill Sans; ">Mobile</span></span></font><font class="Apple-style-span" face="GillSans-Light"><span class="Apple-style-span" style="font-family: GillSans-Light; "><span class="Apple-style-span" style="font-family: GillSans-Light; "> +1 765 427 5484</span></span></font></div><div><font class="Apple-style-span" face="GillSans-Light"><br class="khtml-block-placeholder"></font></div></span></span></span></span></span></span></span><br class="Apple-interchange-newline"></span></div></span> </div><br><div><div>On Mar 12, 2008, at 4:21 AM, Dragiša Durić wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div> Problem in my case can be thoroughness of GC... Because it's linked<br>list of WeakRef-ed objects, it's always first element in list to become<br>unreachable first - all others are reachable at least through previous<br>(in list) WeakRef-ed object. So, behaviour I have observed can be<br>because of some thousands of freeable objects, that one is missed too<br>often.<br><br> I have other object being cleaned and counted... There also cleanup<br>invocation looks like it's lagging too much. I'll come with numbers<br>after I have more tests.<br><br>dd<br><br>On Tue, 2008-03-11 at 09:50 -0400, Tony Hosking wrote:<br><blockquote type="cite">Sounds like we need some sort of testcase. Would you be able to<br></blockquote><blockquote type="cite">devise one? It will be hard to make it deterministic, but at least we<br></blockquote><blockquote type="cite">should see a non-zero cleanup count.<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">Antony Hosking | Associate Professor | Computer Science | Purdue<br></blockquote><blockquote type="cite">University<br></blockquote><blockquote type="cite">305 N. University Street | West Lafayette | IN 47907 | USA<br></blockquote><blockquote type="cite">Office +1 765 494 6001 | Mobile +1 765 427 5484<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite">On Mar 11, 2008, at 4:03 AM, Dragiša Durić wrote:<br></blockquote><blockquote type="cite"><br></blockquote><blockquote type="cite"><blockquote type="cite">I have single linked list that I use to send messages to many<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">threads.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">It's end is locked for addition, and current end is given to each<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">new<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">client connecting. This way, all client are going towards end of the<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">list so it's head becomes unreferenced and goes away by GC.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Except it does not.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I've added WeakRef cleanup and sequential id's so I can record<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">maximum<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">freed id for checking. No single cleanup happens.<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">I'll cross check my code and count my references from application<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">side,<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">but maybe someone else has similar problems?<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">dd<br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">-- <br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite">Dragiša Durić <<a href="mailto:dragisha@m3w.org">dragisha@m3w.org</a>><br></blockquote></blockquote><blockquote type="cite"><blockquote type="cite"><br></blockquote></blockquote><blockquote type="cite"><br></blockquote>-- <br>Dragiša Durić <<a href="mailto:dragisha@m3w.org">dragisha@m3w.org</a>><br></div></blockquote></div><br></div></body></html>