Compaction means moving objects in RAM so that some objects are removed (the dead objects, that the GC is supposed to reclaim) and all remaining objects become contiguous in RAM. Most compacting GC work by allocating objects within a single, contiguous area obtained from the operating system. Compaction is then like removing the dead objects, … Read more
Lists are not the best datastructure for this type of code (with lots of (++), and (last)). You lose a lot of time constucting and deconstructing lists. I’d use Data.Sequence or arrays, as in C versions. There is no chance for thunks of makeu0 to be garbage-collected, since you need to retain all of them … Read more
In order to determine liveness, Java has to run full GC, so yes, it does. To put the question to sleep… here is the answer, if anyone needs to dig deeper. Feel free. part of /hotspot/agent/src/share/vm/services/attachListener.cpp taken from openjdk http://download.java.net/openjdk/jdk7/ and you must accept http://www.gnu.org/licenses/gpl-2.0.html // Implementation of “inspectheap” command // // Input arguments :- … Read more
This indeed performs excessively poorly, the background GC is not doing you favor here. First thing I noted is that Parallel.ForEach() is using too many tasks. The threadpool manager misinterprets the thread behavior as “bogged down by I/O” and starts extra threads. This makes the problem worse. Workaround for that is: var options = new … Read more
Is it possible to nevertheless loop over entries in some way? No, as you say, the contents of a WeakMap are not accessible by design, and there is no iterability. If not … how does the Chrome console do this? The console uses the debugging API of the JS engine, which allows access to the … Read more
I’m going out on a limb here, but… most people don’t need the full-blown dispose pattern. It’s designed to be solid in the face of having direct access to unmanaged resources (usually via IntPtr) and in the face of inheritance. Most of the time, neither of these is actually required. If you’re just holding a … Read more
“Permission denied” on Windows is often caused by a lock from a running process. It’s probable that there is a stalled Git EXT thread opened the pack file. Try to do the git gc in safe mode. Another option is to clone the repository in a new place and delete the old one.
I don’t see GC.RegisterForFullGCNotification(int,int) anywhere in your code. It looks like you’re using the WaitForFullGC[xxx] methods, but are never registering for the notification. That’s probably why you’re getting the NotApplicable status. However, I’m doubting that GC is your problem, while possible, I suppose it would be good to know about all of the GC modes … Read more
The problem may be that Clear is not doing what you think it is. Clear simply marks the List as being empty without resizing the internal array that it uses behind the scenes. It will, however, remove all references to the individual BasePopulation instances. So if no other data structure has a reference to them … Read more
It will just work: when the MVar is only reachable by the thread that is blocked on it, then the thread is sent the BlockedIndefinitelyOnMVar exception, which will normally cause it to die silently (the default exception handler for a thread ignores this exception). BTW, for doing some cleanup when the thread dies, you’ll want … Read more