I&#39;ve been investigating the performance of some word frequency counting code I wrote, and I came across this stackoverflow thread <a href="http://stackoverflow.com/questions/3058529/curious-about-the-hashtable-problem">http://stackoverflow.com/questions/3058529/curious-about-the-hashtable-problem</a> where Dons shows simple benchmarks for HashTable and IntMap, but I can&#39;t reproduce the &quot;after the fix&quot; performance of the HashTable code, I am very confused as to what version of ghc actually has the fix.<br>
<br>In the post Don writes &quot;With GHC 6.10.2, before the fix, inserting 10M ints:&quot; and then &quot;With GHC 6.13, after the fix:&quot;, is this a typo, shouldn&#39;t it read 6.10.3? Since there is no 6.13 version of ghc yet? If it should be 6.10.3, and I&#39;m running v 6.12.1, why does the HashTable code in Don&#39;s post take 22 seconds to run on my machine (compiled ghc --make -O2) and the IntMap version takes only 5.8s? How can one find out what release the fix for ticket #650 was released into? I&#39;ve tried the release notes but I can&#39;t seem to spot it, and google doesn&#39;t either. The ticket has &quot;Milestone: 6.12.2&quot; but that is struck-through, though the comments would suggest this made it into r 6.12.2, I can&#39;t spot anything in the release notes for that version either.<br>
<br>Can someone help clarify which version the fix will be/is in and how one should figure this out in general for other issues?<br><br>Thanks<br>Tom<br><br><br><br>