garbage-collection

问题 This question already has answers here : Java Thread Garbage collected or not (4 answers) Closed 5 years ago . From the Java API doc: The Java Virtual Machine continues to execute threads until following occurs: All threads that are not daemon threads have died, either by returning from the call to the run method or by throwing an exception that propagates beyond the run method. I hope my assumption is correct that once thread finishes its run() method it becomes eligible for garbage

问题 I'm constantly running out of RAM with some Jupyter Notebooks and I seem to be unable to release memory that is no longer needed. Here is an example: import gc thing = Thing() result = thing.do_something(...) thing = None gc.collect() As you can presume, thing uses a lot of memory to do something and then I don't need it anymore. I should be able to release the memory it uses. Even though it doesn't write to any variables that I can access from my notebook, garbage collector isn't freeing up

问题 I've started programming erlang recently and there are a few things I want to understand regarding GC. As far as I understand there is a generational GC for the private heap of each process and a reference counting GC for the global shared heap. What I would like to know is if there is anyway to get: How many number of collection cycles? How many bytes are allocated and deallocated, on a global level or process level? What are the private heaps, and shared heap sizes? And can we define this

问题 I've started programming erlang recently and there are a few things I want to understand regarding GC. As far as I understand there is a generational GC for the private heap of each process and a reference counting GC for the global shared heap. What I would like to know is if there is anyway to get: How many number of collection cycles? How many bytes are allocated and deallocated, on a global level or process level? What are the private heaps, and shared heap sizes? And can we define this

问题 If a variable is assigned any new content, will the memory allocated for the "old content" be "properly" free'd? For example, in the following script, will the memory for variable "a" as an array of zeros be free'd after "a" is assigned some new stuff import numpy a = numpy.zeros(1000) a = a+1 I would imaging Python is smart enough to do everything cleanly, using the so-called 'garbage collection', which I never really be able to read through. Any confirmation? I'd appreciate it. 回答1:

问题 After reading some answers like this and JEP-346, I have realised that the G1 does release memory back to the OS. However does it release memory back to the OS, even to the point that current memory use can drop below the initial heap memory (i.e before this JEP, in my case JDK11)? Assume I have a Java 11 VM running with Xms and Xmx set as 5GB , on a 8GB RAM, however I am consuming only around 1GB . Will G1 release enough memory back to the OS? I didn't find any documentation anywhere which

问题 I read quite a lot on Google that ruby does not release back memory to the OS and I understand the as well because allocating memory from OS is a costly fair. Which has led me to ask this If a developer want the Ruby to release the memory back to OS from ruby how do they do it. - I guess the answer is manually triggering a GC in Ruby. But is it advisable to do (run manual GC) on a production application. I'm thinking of creating a separate thread(or Actor) in Celluloid to start a GC at every

问题 I read quite a lot on Google that ruby does not release back memory to the OS and I understand the as well because allocating memory from OS is a costly fair. Which has led me to ask this If a developer want the Ruby to release the memory back to OS from ruby how do they do it. - I guess the answer is manually triggering a GC in Ruby. But is it advisable to do (run manual GC) on a production application. I'm thinking of creating a separate thread(or Actor) in Celluloid to start a GC at every

问题 This is a question that surged from this other one: Best practice to have the same view and store multiple times in ExtJS 4 So in a scenario where stores are created in the initComponent function of a grid. Should I override onDestroy of the grid to also destroy the store ? Or these stores would be garbage collected because simply there are no references to them? 回答1: No, the store will still exist after destroying the Grid No, you will not need to override the destroy method of the grid You

问题 In the following code, a Timer is declared inside a function, where it also subscribes to the Elapsed event: void StartTimer() { System.Timers.Timer timer = new System.Timers.Timer(1000); timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed); timer.AutoReset = false; timer.Start(); } Once the function completes, the reference to the Timer is lost (I presume). Does the Elapsed event get unregistered automatically as the object is destroyed, or if not, can the event be