garbage-collection

问题 This question already has answers here : Understanding garbage collection in .NET (2 answers) Closed 7 years ago . From GC.KeepAlive() on MSDN: Code this method at the end, not the beginning, of the range of instructions where obj must be available. Why does it have such non-intuitive behavior? 回答1: Because otherwise technically the JIT and CLI could determine that the value isn't used after that point, and consider the object viable for collection. Heck, the compiler could decide to remove

问题 My question is as the title, and I got some knowledge by searching: linux has shared memory How to measure actual memory usage of an application or process? JVM will reserve the amount of memory setted in Xms What does the -Xms JVM mean in reference to heap memory? But still don't know why, some on can offer some help? Here is my test run on Ubuntu12.04(64bit) | JDK 1.7.0_04. and top shows below: PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4067 brian 20 0 5316m **262m** 7496 S 0 3.3

问题 By monitoring the CLR #Bytes in all Heaps performance counter of a brand new .NET 4.5 server application over the last few days, I can notice a pattern that makes me think that Gen2 collection is not always collecting dead objects, but I am having trouble understanding what exactly is going on. Server application is running in .NET Framework 4.5.1 using Server GC / Background. This is a console application hosted as a Windows Service (with the help of Topshelf framework) The server

问题 I am using Thread for some Async operations. Now primarily I have 3 Threads like : private lateinit var horse1Thread: Thread private lateinit var horse2Thread: Thread private lateinit var timerThread: Thread Calling stop() in onDestroy() of activity causes a UnsupportedOperationException and I thought of setting these values to null to allow GC collection and prevent memory leak. Since my fields are non-null types I cant set them to null . So is this my only option? Or does kotlin provide a

问题 In order to test some scenarios that interact with unmanaged code, I need to force the GC to move an object in memory. I have the following code to test object movement. What code should be written in the section somehow force gc to move mc so that two different addresses are printed to the console? [StructLayout(LayoutKind.Sequential)] class MyClass { public int i; } class Program { static void Main(string[] args) { MyClass mc = new MyClass(); // print address of mc var handle = GCHandle

问题 I'm trying to build my first unit tests and have a class that increments and decrements an instance counter in it's constructor and destructor respectively. I have a test to make sure this works but it fails, it seems that other instances of the class from my other tests aren't having their destructor called when they go out of scope. public class Customer { public Customer() { ++InstanceCount; } public Customer(int customerId) { CustomerId = customerId; ++InstanceCount; } ~Customer() { -

问题 open System let WeakReferenceExample() = let mutable obj = new Object(); let weak = new WeakReference(obj); GC.Collect(); Console.WriteLine("IsAlive: {0}\nobj <> null is {1}\n---", weak.IsAlive, obj <> null); obj <- null; GC.Collect(); Console.WriteLine("IsAlive: {0}", weak.IsAlive); WeakReferenceExample() Console.ReadKey() Translated from the Rx In Action book sample. The above when run gives the following output which is different than what I get when I compile it in C# and run it. IsAlive:

问题 How the the objects managed by spring are garbage collected? Java garbage collector can find the normal objects (I mean I have not injected them via dependency injection). How does the garbage collector collect spring beans? Since it cannot track them via stack. I would like the gc to garbage collect the spring beans that not being used. 来源： https://stackoverflow.com/questions/45757225/garbage-collection-of-spring-beans

问题 I've found several similar questions, but I still can't find the answer to my question. I know that it is enough to close the outer stream and it will close inner stream which is created in line. BufferedInputStream br = new BufferedInputStream(new FileInputStream(file)); br.close(); Consider next example Properties props = new Properties(); props.load(new FileInputStream(configPath)); Should the FileInputStream be assigned to a variable and then closed explicitly (or with try-with-resource

问题 Today I was experimenting with Chronicle Map. Here is a code sample: package experimental; import net.openhft.chronicle.core.values.IntValue; import net.openhft.chronicle.map.ChronicleMap; import net.openhft.chronicle.values.Values; public class Tmp { public static void main(String[] args) { try (ChronicleMap<IntValue, User> users = ChronicleMap .of(IntValue.class, User.class) .name("users") .entries(100_000_000) .create();) { User user = Values.newHeapInstance(User.class); IntValue id =