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• WCF SVC file running under Which Identity?

  - by Lalit

  I have configured a Virtual Directory on IIS 6.0 running under UserA. AppPool for the same is configured under Network Services. I have one WCF svc file running under it, My question is: Is it running on UserA Account Or Network Service?

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• Overriding inherited generic methods

  - by jess

  I have this code in base class protected virtual bool HasAnyStuff<TObject>(TObject obj) where TObject:class { return false; } In child class I am overriding protected override bool HasAnyStuff<Customer>(Customer obj) { //some stuff if Customer.sth etc return false; } I am getting this error '''Type parameter declaration must be an identifier not a type''' What is it I am doing wrong here?

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• What's the pros and cons of singleton in C++?

  - by skydoor

  I have some questions about singletons in C++. Under what situations is a singleton a must? What are the pros and cons of singletons? I was told they could cause memory leaks, how is that? I was also told that initialization is a problem, is that true?

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• How big in bytes is a DataRow

  - by JeffreyABecker

  I have a one-time process (hashing all our user passwords) written using datasets. The performance needs improvement so we've profiled the application and found that increasing the 'batch size' of the update will improve performance. I also know that if I load the entire data set into memory the application will start hitting swap and slow down. The question is: how big is a System.Data.DataRow derived class? I'd like to calculate a batch size which I know won't force the application into swap.

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• AS3: why is this happening?

  - by Bin Chen

  Hi, I just encounter a strange problem: var a:ClassA = new ClassA; var b:ClassA = a; The program keeps running sometime, the a = null, b = null. The program is a complex one, I am sure that no part will touch a, and b. My question is, will the runtime(garbage collector) to collect the memory of "a" and then assign a and b to null? I am confused, thanks!

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• Java execution details in System.out

  - by John

  As I remember there is a magic command line option in Java that turn on writing of operations that are currently executed to console. The output was looked like byte code. I do not mean -verbose, because it prints only class loading, while this option outputs information like memory allocation etc.

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• Why is CompareAndSwap instruction considered expensive?

  - by eyalw

  Why is CompareAndSwap instruction considered expensive? I read in a book: "Memory barriers are expensive, about as expensive as an atomic compareAndSet() instruction." Thanks!

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• What do you consider the best CMS in Java

  - by Petr Macek

  Which CMS are you using in Java and what is your experience with it (in terms of extensibility, usage comfort, framework API, memory usage, performance etc.). I am looking for suggestions.

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• Can I prevent IMAP from grabbing files over X mb using PHP?

  - by mike

  I'm building a little script that will connect to an IMAP account and grab the content of the email and also the attachments. It works well for the most part, but when a really large file comes in, it causes the script to time out. Is there any way that I can check the file size before trying to grab it? I think that would be the simplest solution. Otherwise, I may have to upgrade to a server that has more memory.

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• Have a range of IE builds on test machine

  - by Dan

  I currently have a testing environment for web apps on a virtual machine. The problem - i would like to keep IE 6 for testing and also have access to newer versions of IE as well. How can i do this? Thanks.

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• SWI-Prolog: how to load rdf triples using semweb/rdf_db library?

  - by Li Li

  Hi, I have a rdf file (file.trp) in n-triples format, where each line is: "subject predicate object ." I tried to use rdf_load in semweb/rdf_db to load it into memory, but failed. Here is what I tried: ?- rdf_load('file.trp'). ?- rdf_load('file.trp', [format(triples]). the manual says it supports xml and triples. But it only loads rdf xml files. How can I load such rdf triple file? Thanks, Li

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• How do I sort a Perl hash that has tons of data?

  - by syker

  I am sorting a hash in Perl. I encountered an Out of memory error when running my Perl Script: foreach $key (sort (keys(%hash))) { .... } How do I sort a hash that has tons of data?

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• Tools to profile the most computational cost of my .NET application.

  - by smwikipedia

  I have a C# application which sometimes cost the CPU very high. I want to see which part of the code cost most. But the Microsoft CLR Profiler only determins the memory usage, it's not meant for computational profiling according to here. Is there any tools to do this? Thanks.

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• Passing Activity Context to constructors to use internally - is this bad

  - by jax

  Is is bad practice to pass the Context to a constructor and save it as a private variable for internal use? The other option is to pass the Context as a parameter to methods that need it. Which is the better option? I have a feeling that passing to the constructor might result in memory leaks accidentally.

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• Processing large (over 1 Gig) files in PHP using stream_filter_*

  - by mike

  $fp_src=fopen('file','r'); $filter = stream_filter_prepend($fp_src, 'convert.iconv.ISO-8859-1/UTF-8'); while(fread($fp_src,4096)){ ++$count; if($count%1000==0) print ftell($fp_src)."\n"; } When I run this the script ends up consuming ~ 200 MB of RAM after going through just 35MB of the file. Running it without the stream_filter zips right through with a constant memory footprint of ~10 MB. What gives?

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• Testing Sharepoint 2010 Beta

  - by jobless-spt

  Hi, I have a Virtual Machine with MOSS 2007 (Enterprise), VS2008 and SQL 2005. I want to start exploring 2010. I need to know what I need to get started. Can I donwload 2010 beta from Microsoft Site? Can I just install it without any conflicts with existing setup? Thanks.

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• Load variable only once in struts 1 Action class

  - by xain

  Hi, I have a structs action object instance that loads a variable from a properties file.I want it to happen only the first time the action is called, so in further executions its read from memory. Any hints ? Thanks.

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• would there be such case of jumping, if yes how?

  - by Pooria

  I have an issue in the mind and that is since the jump instruction changes EIP register by adding signed offsets to it(if I'm not making a mistake here), on IA-32 architecture how would going upward in memory from location 0x7FFFFFFF(biggest positive number in signed logic) to 0x80000000(least negative number in signed logic) be possible? or maybe there shouldn't be such jump due to the nature of signed logic?

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• Including a C header which declares a variable called "new"?

  - by StackedCrooked

  I'm trying to use the OpenCA library in a C++ application. However, when including the file pki_x509_data_st.h the following code fragment is encountered: typedef struct pki_x509_callbacks_st { /* ---------------- Memory Management -------------------- */ void * (*new) (void ); void (*free) (void *x ); void * (*dup) (void *x ); This won't compile because of the "new" pointer declaration. How can I make it work?

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• Is Appfogs pricing model sustainable?

  - by Kyle Finley

  I was looking at AppFog's Pricing and they appear to be giving 2GB of ram away for free, to nonpaying customers. This seems unprecedented for PAAS provodes--providers like Heroku and App Engine remove the app from memory if it has been inactive for certain amount of time. Does cloudfoundry work similarly? Am I wrong in assuming that in a few years appfog servers will be filled with inactive non paying applications?

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• C# program freezes without breakpoints

  - by Lily

  Hi, I'm implementing a program which gets text from various sites and checks which ones are most relevant to a query. The problem is that when I have breakpoints in my code it works perfectly well but without it, the program just freezes. Is this a memory issue? What can I do to solve this please? THanks

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• Struct inside a class

  - by Balakrishnan

  I have a class definition of the form class X { public: //class functions private: A_type *A; //other class variables }; and struct A_type is defined as struct A_type { string s1,s2,s3; }; Inside the constructor, I allocate appropriate memory for A and try A[0].s1="somestring"; It shows segmentation fault. Is this kind of declaration invalid, or am I missing something

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• Facebook data collection ethical issues

  - by the_great_monkey

  If I have a Facebook app, and my users agree to allow my app to access their information, photos, friends, etc, is it ethical to grab their information when they log in, and then saving it in memory so that the next time he goes to my app, it can load faster? If so, what about when the user logged off? Is the right thing to do to is to delete all the cached information and photos that the user provided? Has Facebook got any way to detect that we're doing this (saving their information, etc)?

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• How to convert Hex to Ascii in C with and without using sprintf?

  - by patrick

  I used strtol to convert a string to hex, now I need to print it to the screen. I'm not sure if I can use sprintf since I only have 20k of memory to use on this board. Alternatives welcome.

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• Any impact of restart OWSTIMER every hour?

  - by Khun

  I found OWSTIMER consume a lot of memory during create personal sites. (I have to pre-create personal sites for many users) After googling I found some suggestion to restart OWSTIMER but it’ll grow up again after create several personal sites. So I have to restart OWSTIMER every hour. Did you know any impact of restart OWSTIMER every hour? Thank you

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