memory

How to analyze Heap Dumps

由 陌路散爱 提交于 2020-01-23 14:59:05
问题 I am successful in generating Heap Dumps of my application machine but I do not know how to analyze it. Can someone tell me how to? 回答1: Use jhat utility for Java on Sun solaris. A good example is here https://blogs.oracle.com/alanb/entry/heap_dumps_are_back_with 回答2: You can try VisialVM, for some reason my heap dump wasn't loading in jhat but was in visualVM. It give you a graph of the class that are taking much of the heap. here where to get it: http://visualvm.java.net/download.html 来源：

How to find byte sizes of R figures on pages?

由 蓝咒 提交于 2020-01-23 13:51:52
问题 I would like to monitor the basic quality of the figures produced in R on individual pages such as byte size of each page, ... I can now do only quality assurance of average pages, see the following chapter about it. I think there must be something builtin for the task than average measures. Code which produces 4 pages in Rplots.pdf where I would like to know the byte size of each page in an output here; any other statistics of the page outputs is also welcome; you can get the basic memory

Free up memory by deleting numpy arrays

由 假装没事ソ 提交于 2020-01-23 13:51:48
问题 I have written a fatigue analysis program with a GUI. The program takes strain information for unit loads for each element of a finite element model, reads in a load case using np.genfromtxt('loadcasefilename.txt') and then does some fatigue analysis and saves the result for each element in another array. The load cases are about 32Mb as text files and there are 40 or so which get read and analysed in a loop. The loads for each element are interpolated by taking slices of the load case array.

Error: cannot allocate vector of size X Mb in R

由 泪湿孤枕 提交于 2020-01-23 13:25:11
问题 I have question regarding memory usage in R. I am running a Rcode on our entire database in R in a for loop. However, the code stops at some point saying that it cannot allocate a vector of size 325.7 mb. When I was looking at the task manager I saw that it was using 28gb of RAM on our server. I am familiar with the gc() function in R but this does not seems to work. E.g. the code stopped working on the 15th iteration, saying that it cannot allocate the vector. However, if I only run the 15th

Excessive memory usage by comctl32.dll when a checkbox control's Visible becomes true

由 有些话、适合烂在心里 提交于 2020-01-23 10:51:08
问题 I am adding controls to a Windows Form during runtime in a C# .NET application. Each of these controls interacts with a particular signal and uses some data from that signal -- signal name, description, source, units, value, etc. These controls have a check box on them. When the Visible property of the checkbox of just one of these signals becomes true, my application's Committed memory jumps over 800MB. None of the other hundreds of signals have the problem. I used the DebugDiag tool to

Excessive memory usage by comctl32.dll when a checkbox control's Visible becomes true

由 这一生的挚爱 提交于 2020-01-23 10:50:06
问题 I am adding controls to a Windows Form during runtime in a C# .NET application. Each of these controls interacts with a particular signal and uses some data from that signal -- signal name, description, source, units, value, etc. These controls have a check box on them. When the Visible property of the checkbox of just one of these signals becomes true, my application's Committed memory jumps over 800MB. None of the other hundreds of signals have the problem. I used the DebugDiag tool to

Malloc Allocation Schemes

由 拥有回忆 提交于 2020-01-23 07:15:15
问题 Yes, I am taking a Computer systems course. I had a few questions about the various allocation schemes to implement malloc. For explicit lists, if I implement malloc using a LIFO-like stack, what exactly is the purpose of having pointers to previous freed memory? Like why do you need doubly-linked lists? Wouldn't singly linked lists work just as well? Malloc lecture. I found this link online, you can look at slide 7 to see what I'm talking about. When looking at a segregated list allocation

Java Static Variables and inheritance and Memory

由 爱⌒轻易说出口 提交于 2020-01-23 06:35:10
问题 I know that if I have multiple instance of the same class all of them are gonna share the same class variables, so the static properties of the class will use a fixed amount of memory no matter how many instance of the class I have. My question is: If I have a couple subclasses inheriting some static field from their superclass, will they share the class variables or not? And if not, what is the best practice/pattern to make sure they share the same class variables? 回答1: If I have a couple

Java Static Variables and inheritance and Memory

由 那年仲夏 提交于 2020-01-23 06:31:45
问题 I know that if I have multiple instance of the same class all of them are gonna share the same class variables, so the static properties of the class will use a fixed amount of memory no matter how many instance of the class I have. My question is: If I have a couple subclasses inheriting some static field from their superclass, will they share the class variables or not? And if not, what is the best practice/pattern to make sure they share the same class variables? 回答1: If I have a couple

Virtual address cache memory, processor and multiprocessor

由 房东的猫 提交于 2020-01-23 05:08:46
An embodiment provides a virtual address cache memory including: a TLB virtual page memory configured to, when a rewrite to a TLB occurs, rewrite entry data; a data memory configured to hold cache data using a virtual page tag or a page offset as a cache index; a cache state memory configured to hold a cache state for the cache data stored in the data memory, in association with the cache index; a first physical address memory configured to, when the rewrite to the TLB occurs, rewrite a held physical address; and a second physical address memory configured to, when the cache data is written to
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