For my bachelor thesis i want to visualize the data remanence of memory and how it persists after rebooting a system. I had the simple idea to mmap a picture to memory, shut down my computer, wait x seconds, boot the computer and see if the picture is still there. int mmap_lena(void) { FILE *fd = NULL; size_t lena_size; vo...
Just to follow up on here: http://stackoverflow.com/questions/961795/creating-very-large-image-files-with-bufferedimage-strange-issues-depending-on-c I still have the issue and I did try the Xmx command line to make sure the JVM had at least 1024m of RAM, I put the parametere in as both -Xmx1024m and -Xmx 1024m but neither worked. ...
Hi All, I'm getting very confused with memory management in relation to vectors and could do with some basic concepts explaining. I have a program that uses big vectors. I created the vectors with the new operator and release them at the end of the program with delete to get the memory back. My question is, if the program crashes or ge...
I'm writing an application that needs to hold around forty 44 kb JPEGs in memory at once. I've heard that applications can use around 22 megabytes before triggering a low memory warning, so I'm pretty sure it should be able to do this. However, once I pass around a megabyte loaded, these messages start popping up in the console: Mon Ju...
I'd like to limit the memory usage for my Perl script, running on a Linux system. I've been trying to use BSD::Resource's setrlimit, but have been having problems. I'd appreciate any pointers. Thank you. ...
We have a bunch of reports on SharePoint, using SQL Reporting Services. The statistics reports - the ones that aggregate data and display few hundreds to a few thousands records are loading fine. However, we also have reports that display raw records from database. These reports usually have tens or hundreds of thousands of records. So...
Hi, I am trying to investigate the behaviour of the Windows Kernel with respect to Memory Mapped Files / Virtual Memory. Specifically I am interested in determining how frequently the contents of a memory mapped file are flushed (by Windows) to disk and what criterion Windows uses for deciding it is time to do so. I have done a bit of ...
What is a fast and efficient way to implement the server-side component for an autocomplete feature in an html input box? I am writing a service to autocomplete user queries in our web interface's main search box, and the completions are displayed in an ajax-powered dropdown. The data we are running queries against is simply a large ta...
Alright folks, We've got Apache 2.2.11 running mod_php 5.2.9-2 on a Windows Server 2003 (Small Business Edition) box, and each request spikes somewhere around 4 to 8MB of RAM, followed by approximately 2 to 6MB of freeing. Basically, the amount Apache releases is always notably less (by megabytes) than the amount it allocates during the...
I'm currently wondering what the actual overhead, in the JVM, is for loading extra classes which are never used. We have code which iterates all the classes in the class path to find classes which implement a certain interface, we then load them. This allows custom classes to be simply dropped in a directory and they get loaded and reg...
How can I obtain a raw access to the HD and know if that location is used or is a free space? Just a piece of example, I can obtain a direct access simply with an open and a read on a disk device, the goal is knowing whether the, for example, the 10.000 byte is used or not. ...
Hi I've been using Linq to SQL against Sql Server CE. Database is read only, so I can have several assumptions. In order to refrain from accessing the file system, my initial approach was to cache needed entities to application memory and using linq to objects against them. While it works well for limited queries, directly using Linq...
I've read (http://blogs.msdn.com/joshwil/archive/2005/08/10/450202.aspx) that the maximum size of an object in .NET is 2 GB. Am I correct in assuming that if I have an Object that takes up 256 MB Memory, since it is a reference type, I can have an array of these 256 MB Objects where all the objects together may takeup >2GB Memory as lon...
Is there a way to know how much memory is consumed by each Eclipse plugin separately? ...
We have a fairly high volume ASP.Net site written in c# using MS commerce server, running in a 32-bit environment. I see the worker process up to 980 megabytes quite often. I would like to profile this process and determine where any gains could be made in code to reduce the memory foot print of this site. My question what tools have wor...
Hi All, i've been trying to figure out wh. sqy my object allocation keeps rigth up every time i call this function, Instruments reports no leaks but I get a heck of a lot of object coming from sqlite3_exec --> sqlite3Prepare --> sqlite3Parser --> yy_reduce --> malloc & also a whole bunch from & from sqlite3Step --> sqlite3VdbeExec...
Possible Duplicate: What REALLY happens when you dont free after malloc? When ending a program in C/C++, you have to clean up by freeing pointers. What happens if you doesn't free the memory, like if you have a pointer to an int and doesn't delete it when ending the program? Is the memory still used and can only be freed by rest...
Is there a way to programmatically check the OpenGL ES texture memory usage on the iPhone? I know you can use Instruments to monitor it, but I would like to do in in the app is possible. ...
EDIT: Got the directory to live. Now there's another issue in sight: The files in the storage are stored with their DB id as a prefix to their file names. Of course I don't want the users to see those. Is there a way to combine the response.redirect and the header setting für filename and size? best, A Hi again, new approach...
When a C program starts and variables are assigned to memory locations, does the C standard say if that value is initialized? // global variables int a; int b = 0; static int c; In the above code, 'b' will be initialized to 0. What is the initial value of 'a'? Is 'c' any different since it is static to this module? ...