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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Search found 13869 results on 555 pages for 'memory dump'.
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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-handlerRead the article
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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.Read the article
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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.Read the article
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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 ?Read the article
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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])Read the article
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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?Read the article
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How does Java order items in a HashMap or a HashTable?
- by ComputerJy
I was wondering how Java sorts items in the Map (HashMap or Hashtable) when they are added. Are the keys sorted by the hashcode, memory reference or by allocation precedence...? It's because I've noticed same pairs in the Map are not always sorted in the same orderRead the article
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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.Read the article
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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?Read the article
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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)?Read the article
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Is there any way to force an iPhone application to relaunch?
- by Jared P
Basically -[UIApplication openURL:] would be perfect, if it wasn't for the fact that it doesn't work within the same application (at least on simulator -- if this works on device someone please tell me). It's not a super big deal though if it just relaunches w/o URLness since I can obviously just persist some data. The goal of this is to essentially free all memory in the application and call all of the loading procedures.Read the article
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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 somethingRead the article
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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?Read the article
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What does it mean to flush a socket?
- by User4748402
I don't really know much about sockets except how to read and write to them as if they were files. I know a little about using socket selectors. I don't get why you have to flush a socket, what's actually happening there? The bits just hang out somewhere in memory until they get pushed off? I read some things online about sockets, but it's all very abstract and high level. What's actually happening here?Read the article
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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.Read the article
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What is null in Java?
- by kunjaan
What is null? Is null an instance of anything? What set does 'null' belong to? How is it represented in the memory?Read the article
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Passing C string reference to C#
- by user336109
c code extern "C" __declspec(dllexport) int export(LPCTSTR inputFile, string &msg) { msg = "haha" } c# code [DllImport("libXmlEncDll.dll")] public static extern int XmlDecrypt(StringBuilder inputFile, ref Stringbuilder newMsg) } I got an error when I try to retrieve the content of newMsg saying that I'm trying to write to a protected memory area. What is the best way to retrieve the string from c to c#. Thanks.Read the article
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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 youRead the article
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Performance analysis for java application
- by user1827614
I want to do a performance measurement of my application and would like to be able to configure the stats for specific module like (enable for specific module and disable for some) and I want to measure things like memory usage, threads, average band width etc.. Can any one suggest something please, I am new to this. I think Visual VM is good but it doesnot support configuring for different modules. Does Perf4j or Admin4j work here? any one has used these before?Read the article
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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? THanksRead the article
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Hidden field value set with jQuery doesn't submit
- by Will
I'm completely perplexed. I set the value of a hidden field with jQuery and the submit the form. The hidden value is present when I dump the $_POST array via PHP unless I use Internet Explorer. Here's the test code: $('#hidden-field').val('I am a hidden value'); // To make sure it's setting properly ... // This shows its being set in FF, Chrome, **AND** IE alert($('#hidden-field').val()); Then on the PHP side: print_r($_POST); For submissions made with IE the result looks like this: Array ( [hidden-field] => ) Other browsers have the value. Help? Why doesn't the value submit and how can I make it?Read the article
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downloading full page text from a web domain
- by user362808
Howdy, folks! First time here -- thought I'd field a question on behalf of a coworker. Somebody in my lab is doing a content analysis (e.g. reading an article or transcript line by line and identifying relevant themes) of the web presences of various privatized neuroimaging centers (e.g. http://www.canmagnetic.com/). She's been c/ping entire site maps by hand, and I know I could slap something together with Python to follow links and dump full text (with line numbers) for her, but I've never actually done anything quite like this. Any ideas for how I'd get started? Cheers, -alexRead the article
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Does Oracle have an equivalent of SQL Server's table variables?
- by Margaret
In SQL Server, you can declare a table variable (DECLARE @table TABLE), which is produced while the script is run and then removed from memory. Does Oracle have a similar function? Or am I stuck with CREATE/DROPs that segment my hard drive?Read the article
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Creating CFArray from MySQL Result Array
- by Andrew
Is there an easy way to dump an array returned from mysql_fetch_row into a CFArray? (part of the PHP implementation of CFPropertyList) I'm bummed by the lack of documentation on CFPropertyList for PHP. Iterating through each item in the array seems inefficient. I'm open to using a different mysql_fetch_... command. I'd like to just say: $NewArray = new CFArray( $ResultArray ) But that deosn't seem to work. This is my current code: $plist = new CFPropertyList(); $ResultRow = mysqli_fetch_row( $result ); $plist-add( $TableRow = new CFArray() ); foreach ( $ResultRow as $Item ){ $TableRow-add( new CFString( $Item ) ); }Read the article
