garbage-collection

CMS garbage collector - when does it run?

由 半世苍凉 提交于 2019-12-28 13:50:10
问题 I am confused about two parameters that may control when the CMS collector kicks in: MaxHeapFreeRatio (70% by default) CMSInitiatingOccupancyFraction (over 90% by default) What does each of those parameters mean, exactly? When does the collector start (the marking phase), and collect (the sweeping phase)? 回答1: CMSInitiatingOccupancyFraction decides when the CMS kicks in (in order for this option to be effective you must also set -XX:+UseCMSInitiatingOccupancyOnly ). MaxHeapFreeRatio is an

CMS garbage collector - when does it run?

由 南楼画角 提交于 2019-12-28 13:50:09
问题 I am confused about two parameters that may control when the CMS collector kicks in: MaxHeapFreeRatio (70% by default) CMSInitiatingOccupancyFraction (over 90% by default) What does each of those parameters mean, exactly? When does the collector start (the marking phase), and collect (the sweeping phase)? 回答1: CMSInitiatingOccupancyFraction decides when the CMS kicks in (in order for this option to be effective you must also set -XX:+UseCMSInitiatingOccupancyOnly ). MaxHeapFreeRatio is an

Garbage Collection and Finalizers: Finer Points

由 泪湿孤枕 提交于 2019-12-28 12:08:14
问题 In answering another question* on SO, and the subsequent comment discussion, I ran into a wall on a point that I'm not clear on. Correct me on any point where I'm astray... When the Garbage Collector collects an object, it calls that object's finalizer, on a separate thread (unless the finalizer has been suppressed, e.g. through a Dispose() method). While collecting, the GC suspends all threads except the thread that triggered the collection (background collection aside). What isn't clear:

free() on stack memory

由 泄露秘密 提交于 2019-12-28 06:46:33
问题 I'm supporting some c code on Solaris, and I've seen something weird at least I think it is: char new_login[64]; ... strcpy(new_login, (char *)login); ... free(new_login); My understanding is that since the variable is a local array the memory comes from the stack and does not need to be freed, and moreover since no malloc/calloc/realloc was used the behaviour is undefined. This is a real-time system so I think it is a waste of cycles. Am I missing something obvious? 回答1: You can only free()

Is there a way to retrieve a C# app's current memory usage?

由 核能气质少年 提交于 2019-12-28 06:17:52
问题 I am automating some profiling tasks and want to log heap space and generation sizes real-time. The profiling API seems awfully complicated for what I need, and it seems to listen in on individual allocations and collections, which isn't that important to me. Profiling tools are a great help of course, but I was looking for a more flexible, programmable interface. 回答1: The term 'current memory usage' is a little loosely defined. Do you mean the working set? Whatever it means, you can use

requestAnimationFrame garbage collection

由 百般思念 提交于 2019-12-28 05:09:29
问题 I'm profiling the following code's memory usage using the Timeline in Chrome Dev Tools v27. <!DOCTYPE html> <html> <head> <meta http-equiv='content-type' content='text/html; charset=UTF-8' /> <title>RAF</title> </head> <body> <script type='text/javascript' charset='utf-8'> var frame = function() { window.webkitRequestAnimationFrame(frame); }; window.webkitRequestAnimationFrame(frame); </script> </body> </html> Notice it's simple. But eventually I see the a tooth pattern appear that indicates

Very High Memory Usage in .NET 4.0

由 喜你入骨 提交于 2019-12-28 05:02:32
问题 I have a C# Windows Service that I recently moved from .NET 3.5 to .NET 4.0. No other code changes were made. When running on 3.5, memory utilzation for a given work load was roughly 1.5 GB of memory and throughput was 20 X per second. (The X doesn't matter in the context of this question.) The exact same service running on 4.0 uses between 3GB and 5GB+ of memory, and gets less than 4 X per second. In fact, the service will typically end up stalling out as memory usage continue to climb until

Timer, event and garbage collection : am I missing something?

由 穿精又带淫゛_ 提交于 2019-12-28 02:09:10
问题 Consider the following code : class TestTimerGC : Form { public TestTimerGC() { Button btnGC = new Button(); btnGC.Text = "GC"; btnGC.Click += (sender, e) => GC.Collect(); this.Controls.Add(btnGC); System.Windows.Forms.Timer tmr = new System.Windows.Forms.Timer(); tmr.Interval = 1000; tmr.Tick += (sender, e) => this.Text = DateTime.Now.ToString(); tmr.Start(); } } If I'm not mistaken, after the tmr variable goes out of scope, the Timer isn't referenced anywhere, so it should be eligible for

Garbage collection of String literals

由 吃可爱长大的小学妹 提交于 2019-12-27 09:53:37
问题 I am reading about Garbage collection and i am getting confusing search results when i search for String literal garbage collections. I need clarification on following points: If a string is defined as literal at compile time [e.g: String str = "java" ] then will it be garbage collected? If use intern method [e.g: String str = new String("java").intern() ] then will it be garbage collected? Also will it be treated differently from String literal in point 1. Some places it is mentioned that

Garbage collection of String literals

由 巧了我就是萌 提交于 2019-12-27 09:53:24
问题 I am reading about Garbage collection and i am getting confusing search results when i search for String literal garbage collections. I need clarification on following points: If a string is defined as literal at compile time [e.g: String str = "java" ] then will it be garbage collected? If use intern method [e.g: String str = new String("java").intern() ] then will it be garbage collected? Also will it be treated differently from String literal in point 1. Some places it is mentioned that
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