Search Results

Search found 22961 results on 919 pages for 'memory management'.

Page 723/919 | < Previous Page | 719 720 721 722 723 724 725 726 727 728 729 730  | Next Page >

• Clojure closures and GC

  - by Ralph

  It is my understanding that the default ClassLoader used in Java (and thus, Clojure) holds on to pointers to any anonymous classes created, and thus, onto lambdas and closures. These are never garbage collected, and so represent a "memory leak". There is some investigation going on for Java 7 or 8 to adding an anonymous ClassLoader that will not retain references to these functions. In the mean time how are people dealing with writing long-running applications in languages like Clojure and Scala, that encourage the use of these constructs? Is there any possibility that Clojure could provide its own anonymous ClassLoader, extending the system one, but not holding onto created classes?

  Read the article

• Can an app delete its own internal resources?

  - by user637884

  I am trying to find a way to delete an internal resource after an app installs. More specifically, I have a zip file included in the apk, that I unzip to the SD Card when the app is first run. But then want to delete the now unneeded zip file (the purpose being to save the user internal phone memory). I access the zip file with, Resources resources = this.getResources(); InputStream is = resources.openRawResource(R.raw.assets); But am uncertain how to then delete the resource (if even possible). I know one may ask why not simply install the app to SD Card at download. But the app includes a screen widget, and installing apps to the SD Card and using a screen widget is problematic. Thanks, Matt

  Read the article

• Good Silverlight 4.0 chart / graph component?

  - by Duncan Bayne

  I've been using the Silverlight Toolkit but I'm finding the quality lacking; in particular this memory leak / phantom point bug renders the Chart component completely unusable. Can anyone recommend a good chart / graph component for Silverlight 4.0? I'm looking for one that provides: multiple simultaneous series, both scatter and line multi-select of points configurable tool-tips automatic axis scaling real-time update of data That last point sounds trivial but is tripping up the Silverlight Toolkit Chart; if you rapidly change the axis range, it sometimes leaves phantom points behind in addition to the points it should be displaying.

  Read the article

• How are a session identifiers generated?

  - by Asaf R

  Most web applications depend on some kind of session with the user (for instance, to retain login status). The session id is kept as a cookie in the user's browser and sent with every request. To make it hard to guess the next user's session these session-ids need to be sparse and somewhat random. The also have to be unique. The question is - how to efficiently generate session ids that are sparse and unique? This question has a good answer for unique random numbers, but it seems not scalable for a large range of numbers, simply because the array will end up taking a lot of memory.

  Read the article

• Ruby: Read large data from stdout and stderr of an external process on Windows

  - by BinaryMuse

  Greetings, all, I need to run a potentially long-running process from Ruby on Windows and subsequently capture and parse the data from the external process's standard output and error. A large amount of data can be sent to each, but I am only necessarily interested in one line at a time (not capturing and storing the whole of the output). After a bit of research, I found that the Open3 class would take care of executing the process and giving me IO objects connected to the process's standard output and error (via popen3). Open3.popen3("external-program.bat") do |stdin, out, err, thread| # Step3.profit() ? end However, I'm not sure how to continually read from both streams without blocking the program. Since calling IO#readlines on out or err when a lot of data has been sent results in a memory allocation error, I'm trying to continuously check both streams for available input, but not having much luck with any of my implementations. Thanks in advance for any advice!

  Read the article

• How can I print the cookie_jar values in Perl's WWW::Mechanize?

  - by Phill Pafford

  How can I print the values of the cookie/cookie_jar being set? Trying: ##my $cookie_jar=HTTP::Cookies->new(file => "cookie.jar",autosave=>1,ignore_discard=>1); my $cookie_jar=HTTP::Cookies->new(); ## Would like it to be in memory my $agent = WWW::Mechanize->new(cookie_jar => $cookie_jar); ##my $agent = WWW::Mechanize->new(); ##my $agent = WWW::Mechanize->new(autocheck => 1); ##$agent->cookie_jar( {} ); # we need cookies ##$agent->cookie_jar(HTTP::Cookies->new); print "Set Cookie Jar?\n"; print $agent->cookie_jar->as_string(); print "\n"; $agent->get($url); // url is a https site Not too much luck with any of these, what am I doing wrong?

  Read the article

• Need help understanding .net ThreadPool

  - by Meredith

  I am trying to understand what ThreadPool does, I have this .NET example: class Program { static void Main() { int c = 2; // Use AutoResetEvent for thread management AutoResetEvent[] arr = new AutoResetEvent[50]; for (int i = 0; i < arr.Length; ++i) { arr[i] = new AutoResetEvent(false); } // Set the number of minimum threads ThreadPool.SetMinThreads(c, 4); // Enqueue 50 work items that run the code in this delegate function for (int i = 0; i < arr.Length; i++) { ThreadPool.QueueUserWorkItem(delegate(object o) { Thread.Sleep(100); arr[(int)o].Set(); // Signals completion }, i); } // Wait for all tasks to complete WaitHandle.WaitAll(arr); } } Does this run 50 "tasks", in groups of 2 (int c) until they all finish? Or I am not understanding what it really does.

  Read the article

• some examples for using specific searchalgorithm

  - by Robert

  I could understand the following search algorithms: Constraint Satisfaction with Arc Consistency, Uninformed search A* Search MinMax I would understand the definition and working principles of the above algorithm,but could you please give me some real world examples that the above algorithms will be suitable?My idea would be: For CSP with Arc Consistency,assign students to groups that each group must contain both technical and management students,and no 2 technical students in a same group. Uniformed Search: search for a file under UNIX directoy. A* Search: search a way (staring from home) to go to mulitple stores to buy things then get back home with minimum total travelling time. MinMax:Go or other Chess. Please correct me if I am wrong.

  Read the article

• Quick way to do data lookup in PHP

  - by Ghostrider

  I have a data table with 600,000 records that is around 25 megabytes large. It is indexed by a 4 byte key. Is there a way to find a row in such dataset quickly with PHP without resorting to MySQL? The website in question is mostly static with minor PHP code and no database dependencies and therefore fast. I would like to add this data without having to use MySQL if possible. In C++ I would memory map the file and do a binary search in it. Is there a way to do something similar in PHP?

  Read the article

• Why does this script work in the current directory but fail when placed in the path?

  - by kiloseven

  I wish to replace my failing memory with a very small shell script. #!/bin/sh if ! [ –a $1.sav ]; then mv $1 $1.sav cp $1.sav $1 fi nano $1 is intended to save the original version of a script. If the original has been preserved before, it skips the move-and-copy-back (and I use move-and-copy-back to preserve the original timestamp). This works as intended if, after I make it executable with chmod I launch it from within the directory where I am editing, e.g. with ./safe.sh filename However, when I move it into /usr/bin and then I try to run it in a different directory (without the leading ./) it fails with: *-bash: /usr/bin/safe.sh: /bin/sh: bad interpreter: Text file busy* My question is, when I move this script into the path (verified by echo $PATH) why does it then fail? D'oh? Inquiring minds want to know how to make this work.

  Read the article

• ContextSwitchDeadlock Was Detected error in C#

  - by assassin

  Hi, I am running a C# application, and during run-time I get the following error: The CLR has been unable to transition from COM context 0x20e480 to COM context 0x20e5f0 for 60 seconds. The thread that owns the destination context/apartment is most likely either doing a non pumping wait or processing a very long running operation without pumping Windows messages. This situation generally has a negative performance impact and may even lead to the application becoming non responsive or memory usage accumulating continually over time. To avoid this problem, all single threaded apartment (STA) threads should use pumping wait primitives (such as CoWaitForMultipleHandles) and routinely pump messages during long running operations. Can anyone please help me out with the problem here? Thanks a lot.

  Read the article

• Monitoring .NET ASP.NET Applications

  - by James Hollingworth

  I have a number of applications running on top of ASP.NET I want to monitor. The main things I care about are: Exceptions: We currently some custom code which will email us when an exception occurs. If the application is failing hard it will crash our outlook... I know (and use) elmah which partly solves the problem however it is still just a big table of exceptions with a pretty(ish) UI. I want something that makes sense of all of these exceptions (e.g. groups exceptions, alerts when new ones occur, tells me what the common ones are that I should fix, etc) Logging: We currently log to files which are then accessible via a shared folder which dev's grep & tail. Does anyone know of better ways of presenting this information. In an ideal world I want to associate it with exceptions. Performance: Request times, memory usage, cpu, etc. whatever stats I can get I'm guessing this is probably going to be solved by a number of tools, has anyone got any suggestions?

  Read the article

• How do I write Push and Pop in Scheme?

  - by kunjaan

  Right now I have (define (push x a-list) (set! a-list (cons a-list x))) (define (pop a-list) (let ((result (first a-list))) (set! a-list (rest a-list)) result)) But I get this result: Welcome to DrScheme, version 4.2 [3m]. Language: Module; memory limit: 256 megabytes. > (define my-list (list 1 2 3)) > (push 4 my-list) > my-list (1 2 3) > (pop my-list) 1 > my-list (1 2 3) What am I doing wrong? Is there a better way to write push so that the element is added at the end and pop so that the element gets deleted from the first?

  Read the article

• Splitting a string into new rows in R

  - by user3703195

  I have a data set like below: Country Region Molecule Item Code IND NA PB102 FR206985511 THAI AP PB103 BA-107603 / F000113361 / 107603 LUXE NA PB105 1012701 / SGP-1012701 / F041701000 IND AP PB106 AU206985211 / CA-F206985211 THAI HP PB107 F034702000 / 1010701 / SGP-1010701 BANG NA PB108 F000007970/25781/20009021 I want to split based the string values in ITEMCODE column on / and create a new row for each entry. For instance, the desired output will be: Country Region Molecule Item Code New row IND NA PB102 FR206985511 FR206985511 THAI AP PB103 BA-107603 / F000113361 / 107603 F000113361 107603 BA-107603 LUXE NA PB105 1012701 / SP-1012701 / F041701000 1012701 SP-1012701 F041701000 IND AP PB106 AU206985211 / CA-F206985211 AU206985211 CA-F206985211 THAI HP PB107 F034702000 / 1010701 / SP-1010701 F034702000 1010701 SP-1010701 BANG NA PB108 F000007970/25781/20009021 F000007970 25781 20009021 I tried the below code library(splitstackshape) df2=concat.split.multiple(df1,"Plant.Item.Code","/", direction="long") but got the Error "Error: memory exhausted (limit reached?)" When i tried strsplit() i got the below error message. Error in strsplit(df1$Plant.Item.Code, "/") : non-character argument Any help from you will be appreciated.

  Read the article

• Upload File to Database in ColdFusion

  - by George Johnston

  I simply would like to upload a file to my database using ColdFusion. I understand how to upload an image to a directory, but I would like to place it directly in the database. I have set a database field to varbinary(MAX) to accept the image and have the stored procedure to insert it. Currently my code for uploading the image to my file system is: <cfif isdefined("form.FileUploadImage")> <cffile action="upload" filefield="FileUploadImage" destination="#uploadfolder#" nameconflict="overwrite" accept="image/*" > </cfif> I've obviously left some of the supporting code out, but really all I need to do is get a binary representation of the file stored in memory, instead of the file system. Any experts out there that can help? Thanks, George

  Read the article

• What are the primary advantages of Visual Studio Team Foundation Server over the other versions?

  - by Andrew Dunaway

  We are looking into the possibility of upgrading to Team Foundation Server 2008 for our development team. One of our primary reasons is some of the deployment capabilities surrounding BizTalk 2009, but I am curious what other benefits there are for other projects outside of BizTalk. Some of our interests so far are moving to a one click build and deploy process, the addition of unit tests, and continuous integration. Some definite steps forward for the company I work for. What other benefits or information should I look at as I pitch this to upper management? I am looking for technical reasons, money is a not really a concern for this discussion.

  Read the article

• How to create schema that have an access as that of dbo and can be accessed by sa user

  - by Shantanu Gupta

  I am new to schema, roles and user management part in sql server. Till now I used to work with simple dbo schema but now after reading few articles I am intrested in creating schema for managing my tables in a folder fashion. At present, I want to create a schema where i want to keep my tables that have same kind of functionality. When I tries to create a schema then I faces a problem while using query, permissions etc. First of all i want to get used to of using schemas then only I want to explore it. But due to initial stages and work pressure as well i m not able to implement it yet. What can i do to start using schema with default permissions as that of dbo. Also let me know about creating roles and assigning roles on these schema. I want all this to be accessible by sa user itself at present. What is the concept behind all these things

  Read the article

• What would you use for auto completion in Rails app?

  - by Andrei

  I want to use auto-completion in a number of fields (5-7) in my forms. There is a screencast on auto-completion with Prototype library by Ryan Bates ( http://railscasts.com/episodes/102-auto-complete-association). On the other hand, I have noticed that quite many guys suggest jQuery for this task ( http://jquery.bassistance.de/autocomplete/demo/). And I guess, there was probably some development last year(s), so I ask you - what would you use nowadays to auto-complete your form fields and why? BTW, I still have an open question on auto completion for HABTM association: http://stackoverflow.com/questions/1510935/how-to-do-habtm-management-with-auto-completion-in-rails

  Read the article

• php fail to open a sqlserver 2000 database

  - by Mike108

  I can use the sql server management studio to open a sqlserver 2000 database, but I can not open the same database in a php page using the same user and password. what is the problem? if(!$dbSource->open("192.168.4.241:1433","sa","sa","NorthWind")) { echo "Fail to open the sql server 2000 database"; } ----------------------- function open($db_server, $db_user, $db_password, $db_name) { $this->conn = mssql_connect($db_server, $db_user, $db_password); if(!$this->conn) { return false; } @mssql_select_db($db_name, $this->conn); return true; }

  Read the article

• Could someone give me their two cents on this optimization strategy

  - by jimstandard

  Background: I am writing a matching script in python that will match records of a transaction in one database to names of customers in another database. The complexity is that names are not unique and can be represented multiple different ways from transaction to transaction. Rather than doing multiple queries on the database (which is pretty slow) would it be faster to get all of the records where the last name (which in this case we will say never changes) is "Smith" and then have all of those records loaded into memory as you go though each looking for matches for a specific "John Smith" using various data points. Would this be faster, is it feasible in python, and if so does anyone have any recommendations for how to do it?

  Read the article

• Freeing JavaScript object

  - by pion

  I am looking at the example from http://www.javascriptkit.com/javatutors/oopjs.shtml var person = new Object() person.name = "Tim Scarfe" person.height = "6Ft" But there is no mention how to "free" it in order to avoid memory leak. Will the following code free it? person = null; How do you free a JavaScript Object using "new Object()? How do you free a JavaScript Array allocated using "new Array(10)"? How do you free a JavaScript JSON allocated using "var json = {"width": 480, "height": 640}"? Thanks in advance for your help.

  Read the article

• Connect two daemons in python

  - by Simon

  What is the best way to connect two daemons in Python? I have daemon A and B. I'd like to receive data generated by B in A's module (maybe bidirectional). Both daemons support plugins, so I'd like to shut communication in plugins. What's the best and cross-platform way to do that? I know few mechanisms from low-level solutions - shared memory (C/C++), linux pipe, sockets (TCP/UDP), etc. and few high-level - queue (JMS, Rabbit), RPC. Both daemons should run on the same host, but obviously better approach is to abstract from connection type. What are typical solutions/libraries in python? I'm looking for an elegant and lightweight solution. I don't need external server, just two processes talking with each other. What should I use in python to do that?

  Read the article

• Does AsEnumerable() cache all result (LINQ)

  - by Akshay

  When we call a query operator on a sequence, a sequence-specific operator gets called. I mean if i call Where<>() operator on IEnumerable<>, the operator that will be called will be defined in Enumerable class and if it's called on IQueryable<>, the one defined in Queryable class will be called. Consider the operator Reverse, defined in the Enumerable class. If i want to call it on Iqueryable<> then I must use the AsEnumerable<>() operator to first convert it into IEnumerable<>. db.Countries.OrderBy(cntry=>cntry.CountryName).AsEnumerable().Reverse() But the Reverse operator got to have all records at the same time so that it can reverse them. In the above code do all the records get loaded in memory first and then the Reverse() operator is reversing it ?

  Read the article

• Joomla article not showing in the frontend but its visible in administrative part.

  - by user248674

  I have a very big article to be put into our joomla site. At first I was getting "Fatal error: Allowed memory size of 8388608 bytes exhausted (tried to allocate 285487 bytes) in..." . But then I increased the memory_limit in php.ini . And I was able to create the article. Now I can view the article by logging into backend. But the article is not at all visible in the front end. If I click on the menu item pointing to that article, all I can see is a blank page with nothing in it. All other articles in the site are visible properly. Any idea? ps: I have enabled the error reporting to maximum, also ran the site in debugging mode. But saw nothing unusual.

  Read the article

• How does c# type safety affect the garbage collection?

  - by Indeera

  I'm dealing with code that handles large buffers ( 100MB) and manipulation of these is done in unsafe blocks. I'd like to refactor these to avoid unsafe code. I'm wondering about the likely memory performance gains (positive/negative/neutral) before I embark on that. I assert that if the compiler can verify types, it could possibly generate better code and that could also mean good GC performance. Is this a valid assertion? What is your experience? Thanks.

  Read the article

< Previous Page | 719 720 721 722 723 724 725 726 727 728 729 730  | Next Page >