memory-consumption

Setting memory consumption limits with Upstart

夙愿已清 提交于 2019-12-02 18:15:30
I've recently become quite fond of Upstart. Previously I've been using God, Monit and Bluepill but I don't really like these solutions so I'm giving Upstart a try. I've been using the Foreman gem to generate some basic Upstart configuration files for my processes in /etc/init . However, these generated files only handle the respawning of a crashed process. I was wondering whether it's possible to tell Upstart to restart a process that's consuming for example > 150mb of memory, as you would with Monit, God or Bluepill. I read through the Upstart docs and this looks like the thing I'm looking

The memory consumption of hadoop's namenode?

老子叫甜甜 提交于 2019-12-02 16:01:16
Can anyone give a detailed analysis of memory consumption of namenode? Or is there some reference material ? Can not find material in the network.Thank you! Pitt I suppose the memory consumption would depend on your HDFS setup, so depending on overall size of the HDFS and is relative to block size. From the Hadoop NameNode wiki : Use a good server with lots of RAM. The more RAM you have, the bigger the file system, or the smaller the block size. From https://twiki.opensciencegrid.org/bin/view/Documentation/HadoopUnderstanding : Namenode: The core metadata server of Hadoop. This is the most

How many integers can I create in 1GB memory?

二次信任 提交于 2019-12-01 17:14:12
In book Algorithms fourth edition by Robert Sedgewick on page 200, it says "for example, if you have 1GB of memory on your computer (1 billion bytes), you cannot fit more than about 32 million int values." I got confused after my calculation: 1,000,000,000 bytes/4 bytes = 250 million How the author got 32 million? The book describes like below: The author has acknowledged that this is an error in this book website, please refer to the link as follows: http://algs4.cs.princeton.edu/errata/errata-printing3.php 1 gigabit = 1073741824 bit 1 int = 32 bit calculation = (1073741824/32) = (32 * 1024 2

Using Reflection to determine which Fields are backing fields of a Property

家住魔仙堡 提交于 2019-11-30 08:28:25
问题 I'm using reflection to map out objects. These objects are in managed code but I have no visibility into their source code, underlying structure, etc. other than through reflection. The overarching goal of all this is a rudimentary memory map of an object (similar in functionality to SOS.dll DumpObject and !ObjSize commands). As such, I'm trying to determine which members are being "double counted" as both a field and a property. For example: public class CalendarEntry { // private property

Using Reflection to determine which Fields are backing fields of a Property

吃可爱长大的小学妹 提交于 2019-11-29 06:36:24
I'm using reflection to map out objects. These objects are in managed code but I have no visibility into their source code, underlying structure, etc. other than through reflection. The overarching goal of all this is a rudimentary memory map of an object (similar in functionality to SOS.dll DumpObject and !ObjSize commands). As such, I'm trying to determine which members are being "double counted" as both a field and a property. For example: public class CalendarEntry { // private property private DateTime date { get; set;} // public field public string day = "DAY"; } When mapped shows:

Calling getters on an object vs. storing it as a local variable (memory footprint, performance)

你说的曾经没有我的故事 提交于 2019-11-26 08:08:56
问题 In the following piece of code we make a call listType.getDescription() twice: for (ListType listType: this.listTypeManager.getSelectableListTypes()) { if (listType.getDescription() != null) { children.add(new SelectItem( listType.getId() , listType.getDescription())); } } I would tend to refactor the code to use a single variable: for (ListType listType: this.listTypeManager.getSelectableListTypes()) { String description = listType.getDescription(); if (description != null) { children.add