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• What does "performant" software actually mean?

  - by Roddy

  I see it used a lot, but haven't seen a definition that makes complete sense. Wiktionary says "characterized by an adequate or excellent level of performance or efficiency", which isn't much help. Initially I though performant just meant "fast", but others seem to think it's also about stability, code quality, memory use/footprint, or some combination of all those. I think this is a "real" question - but if enough people reckon this is a subjective question, that's an answer in itself.

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• Question regarding C++ Lists

  - by mousey

  Hi, list<Dog*> dog; ............. ............ So I added many dog objects to it. If I call dog.pop_front(); Does memory automatically gets deallocated ?

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• Where's the best place to find good senior web developers?

  - by bokani

  We are looking for a senior web developer for a business start up based in London Mayfair? • Demonstrable experience developing Web 2.0 projects • Complete fluency in HTML, Javascript, CSS, php and MySQL • Experience of jQuery, AJAX and php interaction • Ability to develop applications making use of APIs (Google Maps, Facebook, bespoke CRMs and similar) • Good design aesthetic, including familiarity with Photoshop and CSS • Substantial experience hand-coding • Familiarity with server administration including cPanel • Ability to design HTML newsletters • Progressive enhancement • AJAX application state-memory Salary : £30,000 to £40,000

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• Android List view.

  - by Dev.Android

  I want to create the activity which will load the images from Web by using urls and i want to load that images in list view and i want some specific text and properties of that image in front of that image like the image below Click to see Image.Is there any way to store that images temporarily in phones memory.So how can i do this activity please give me perfect solution so that i can complete my application.How can i load the images from web.

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• [boost::filesystem] performance: is it better to read all files once, or use b::fs functions over an

  - by rubenvb

  I'm conflicted between a "read once, use memory+pointers to files" and a "read when necessary" approach. The latter is of course much easier (no additional classes needed to store the whole dir structure), but IMO it is slower? A little clarification: I'm writing a simple build system, that read a project file, checks if all files are present, and runs some compile steps. The file tree is static, so the first option doesn't need to be very dynamic and only needs to be built once every time the program is run. Thanks

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• storage classes

  - by ramyabanu

  what is the difference between a variable declared as an auto and static? what is the difference in allocation of memory in auto and static variable? why do we use static with array of pointers and what is its significance?

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• Scope of const char*

  - by Neeraj

  Consider this code: const char* someFun() { // ... some stuff return "Some text!!" } int main() { { // Block: A const char* retStr = someFun(); // use retStr } } My question is in the function sumFun() where is "some Text!!", stored (i think may be in some static area in ROM) and what will be its scope? Will the memory pointed by retStr be occupied throughout the program or be released once the block A exits? -- Thanks

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• How can I measure the speed of code written in Java? (AI algorithms)

  - by Registered User

  Hi All, How can I measure the speed of code written in Java? I planning to develop software which will solve Sudoku using all presently available AI and ML algorithms and compare time against simple brute-force method. I need to measure time of each algorithm, I would like to ask for suggestions on what is the best way of doing that? Very important, program must be useful on any machine regardless to CPU power/memory. Thank you.

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• modify class on runtime?

  - by joe doe2

  how can i modify the method in memory so it makes new objects with that modified method? for example i want to modify or add page_init handler on runtime for the next time the page loads? see this also for clarification: http://stackoverflow.com/questions/3005338/page-load-another-handler

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• Impact of java.sql.Connection.close() on java.sql.Statement objects and the like

  - by Bytecode Ninja

  Does closing a java.sql.Connection also close all the statements, prepared statements, etc. obtained from that connection? Or is there going to be memory leak if I close the connection but leave the statements, etc. unclosed?

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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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• 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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• Concurrent processes do not utilize all available CPU

  - by metdos

  I run some processes on an EC2 cc2.8xlarge instance which has 32 virtual processors. For some type of processes, when I run 16 processes on parallel, all of them use 100% of CPU cycles. But for other type of processes, they are not using 100% CPU and they finish considerably slower than a single thread. There is no time spend on IO and all data is served from memory. Do you have any idea about the reason of this problem?

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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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• 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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• Efficiently generate numpy array from list comprehension output?

  - by shootingstars

  Is there a more efficient way than using numpy.asarray() to generate an array from output in the form of a list? This appears to be copying everything in memory, which doesn't seem like it would be that efficient with very large arrays. (Updated) Example: import numpy as np a1 = np.array([1,2,3,4,5,6,7,8,9,10]) # pretend this has thousands of elements a2 = np.array([3,7,8]) results = np.asarray([np.amax(np.where(a1 > element)) for element in a2])

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