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• Why is the JVM stack-based and the DalvikVM register based?

  - by aioobe

  I'm curious, why did Sun decide to make the JVM stack-based and Google decide to make the DalvikVM register based? I suppose the JVM can't really assume that a certain number of registers are available on the target platform, since it is supposed to be platform independent. Therefor it just postpones the register-allocation etc, to the JIT compiler. (Correct me if I'm wrong.) So the Android guys thought, "hey, that's inefficient, let's go for a register based vm right away..."? But wait, there are multiple different android devices, what number of registers did the Dalvik target? Are the Dalvik opcodes hardcoded for a certain number of registers? Do all current Android devices on the market have about the same number of registers? Or, is there a register re-allocation performed during dex-loading? How does all this fit together?

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• how to obtain a stack trace when WAMP server crashes ?

  - by mithunmo

  Hello, Some times my WAMP server crashes . I get the following error. HTTP has encountered exception and needs to close. Unreferenced Memory. szAppName : httpd.exe szAppVer : 2.2.11.0 szModName : php5ts.dll szModVer : 5.3.0.0 offset : 0000c309 C:\DOCUME~1\blrcom\LOCALS~1\Temp\WERc677.dir00\httpd.exe.mdmp C:\DOCUME~1\blrcom\LOCALS~1\Temp\WERc677.dir00\appcompat.txt My question is how to obtain stack trace to debug this problem ? Should I use a windows debugger windows debugger or is there some setting in WAMP server configuration should i enable ?

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• CSS - how can I handle the size difference between serif and sans-serif fonts?

  - by orbit82

  I'm working on a WordPress that will allow the site administrator to switch between sans-serif and serif fonts. I'm trying to code the stylesheet in such a way that the font sizes are similar whether or not they choose Georgia vs Arial. The problem is that when I have it looking nice with a serif font, it looks WAY too big when in sans-serif. When I then adjust it to look nice in a sans-serif font, it looks WAY too small in serif. Is there an ideal font size and line-height that works well with both serif and sans-serif? Or do I need to make separate stylesheets (a serf version and a sans-serif version)? P.S. I've set a base font size on the body at 12px, and then set the rest of the font sizes as a percentage of the base. Of course, this base font size could be set in ems or in percent, because the percentages will still scale proportionally.

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• Is it wrong to get feedback from Stack Overflow on a live system architecture?

  - by hal10001

  I am the technical director at a startup, and I will eventually be tasked with implementing a "real" system architecture when we hire more programmers. Right now our clients are small enough, and it is just me, so documented deployments, source control, unit tests and quality assurance servers are non-existent. Eventually I will need to devise a work-flow and architecture patterns for the majority of the work we will do (e-commerce). If I posted an architecture diagram, and asked for feedback, would that be a misuse of the Stack Overflow system? I don't want to get into that battle of "hey, don't ask us to do your job for you", but the reality is that any programmer who eventually moves into this realm will have to figure it out with feedback from other developers. HighScalability.com is what comes to mind when I think about this sorta thing in terms of the knowledge I need. So if this is not the right kind of forum for that, then any book recommendations or white papers you can recommend would be appreciated.

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• How does Microsoft Detours work and how do I use it to get a stack trace?

  - by Bruce

  I am new to Microsoft Detours. I have installed it to trace the system calls a process makes. I run the following commands which I got from the web syelogd.exe /q C:\Users\xxx\Desktop\log.txt withdll.exe /d:traceapi.dll C:\Program Files\Google\Google Talk\googletalk.exe I get the log file. The problem is I don't fully understand what is happening here. How does detours work? How does it trace the system calls? Also I don't know how to read the output in log.txt. Here is one line in log.txt 20101221060413329 2912 50.60: traceapi: 001 GetCurrentThreadId() Finally I want to get the stack trace of the process. How can I get that?

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• LAMP Stack with APC installed - WordPress Site - Is WP opcode being cached with APC?

  - by Christopher Altman

  I have a LAMP stack with APC installed. I have a WordPress site on this server. Is WP taking advantage of the opcode caching? I have done no WP configurations. My understanding is that simply having APC installed means that all PHP code is being cached. If that is untrue, please point me to the direction where I can configure WP to take advantage of APC. Note: I thought about this as a ServerFault question, but since the solution to is code related I posted on Stackoverflow.

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• What tech stack/platform to use for a project?

  - by danny z

  Hey guys, This is a bit of a weird meta-programming question, but I've realized that my new project doesn't need a full MVC framework, and being a rails guy, I'm not sure what to use now. To give you a gist of the necessary functionality; this website will display static pages, but users will be able to log in and 'edit their current plans'. All purchasing and credit card editing is being handled by a recurring payment subscriber, I just need a page to edit their current plan. All of that will be done through (dynamic) XML API calls, so no database is necessary. Should I stick with my typical rails/nginx stack, or is there something I could use that would lighten the load, since I don't need the Rails heft. I'm familiar with python and PHP but would prefer not to go that route. Is Sinatra a good choice here? tl;dr: What's a good way to quickly serve mostly static pages, preferably in Ruby, with some pages requiring dynamic XML rendering?

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• What is the largest file size we can transfer through air application?

  - by Naveen kumar

  Hi all, I'm trying to transfer large file(1Gb+) using UDP(in packets) through air application. I'm transfering byteArray by taking chunks of packets from FileStream. But its giving 'Error #1000: The system is out of memory' at sender side after certain number of packets sent and by this time the downloaded file size at server side is 256 MB. I tried with other files but after downloading 256MB, sender is giving the same error. Is it because of the file stream size? How can I solve this problem so that I can transfer files of GB size.

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• Can I get the method local variables through a stack trace in C#?

  - by smwikipedia

  I want to get a detailed log about my stack trace. I can get a StackFrame and then the method and then get all the parameters of that method. Just as the following code: StackTrace st = new StackTrace(); StackFrame[] sfs = st.GetFrames(); foreach (StackFrame sf in sfs) { MethodBase method = sf.GetMethod(); ParameterInfo[] pis = method.GetParameters(); foreach (ParameterInfo pi in pis) { .... } Console.WriteLine(method.Name); } But how could I get the local variables infomation within a method? Could someone shed some light on me? Many thanks.

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• Does the compiler provides extra stack space for byte-spilling?

  - by xuwicha

  From the sample code below which I got here, I don't understand why the value of registers are move to specific part in stack when byte-spilling is performed. pushq %rbp movq %rsp, %rbp subq $96, %rsp leaq L__unnamed_cfstring_23(%rip), %rax leaq L__unnamed_cfstring_26(%rip), %rcx movl $42, %edx leaq l_objc_msgSend_fixup_alloc(%rip), %r8 movl $0, -4(%rbp) movl %edi, -8(%rbp) movq %rsi, -16(%rbp) movq %rax, -48(%rbp) ## 8-byte Spill movq %rcx, -56(%rbp) ## 8-byte Spill movq %r8, -64(%rbp) ## 8-byte Spill movl %edx, -68(%rbp) ## 4-byte Spill callq _objc_autoreleasePoolPush movq L_OBJC_CLASSLIST_REFERENCES_$_(%rip), %rcx movq %rcx, %rdi movq -64(%rbp), %rsi ## 8-byte Reload movq %rax, -80(%rbp) ## 8-byte Spill callq *l_objc_msgSend_fixup_alloc(%rip) movq L_OBJC_SELECTOR_REFERENCES_27(%rip), %rsi movq %rax, %rdi movq -56(%rbp), %rdx ## 8-byte Reload movl -68(%rbp), %ecx ## 4-byte Reload And also, I don't know what is the purpose of byte-spilling since the program logic can still be achieved if the function is the one saving the value of the registers it will be used inside it. I really have no idea why is this happening. Please help me understand this.

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• How to calculate the correct image size in out pdf using itextsharp ?

  - by MK

  I' am trying to add an image to a pdf using itextsharp, regardless of the image size it always appears to be mapped to a different greater size inside the pdf ? The image I add is 624x500 pixel (DPI:72): And here is a screen of the output pdf: And here is how I created the document: Document document = new Document(); System.IO.MemoryStream stream = new MemoryStream(); PdfWriter writer = PdfWriter.GetInstance(document, stream); document.Open(); System.Drawing.Image pngImage = System.Drawing.Image.FromFile("test.png"); Image pdfImage = Image.GetInstance(pngImage, System.Drawing.Imaging.ImageFormat.Png); document.Add(pdfImage); document.Close(); byte[] buffer = stream.GetBuffer(); FileStream fs = new FileStream("test.pdf", FileMode.Create); fs.Write(buffer, 0, buffer.Length); fs.Close(); Any idea why on how to calculate the correct size ?

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• For Qt 4.6.x, how to auto-size text to fit in a specified width?

  - by darenchow

  Inside of my QGraphicsRectItem::paint(), I am trying to draw the name of the item within its rect(). However, for each of the different items, they can be of variable width and similarly names can be of variable length. Currently I am starting with a maximum font size, checking if it fits and decrementing it until I find a font size that fits. So far, I haven't been able to find a quick and easy way to do this. Is there a better, or more efficient way to do this? Thanks! void checkFontSize(QPainter *painter, const QString& name) { // check the font size - need a better algorithm... this could take awhile while (painter->fontMetrics().width(name) > rect().width()) { int newsize = painter->font().pointSize() - 1; painter->setFont(QFont(painter->font().family(), newsize)); } }

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• Optimal Activity Stack Order for a Main Menu button?

  - by kefs

  I'm developing an app that starts with a main menu, and then continues through three different steps (activities) to a final activity where the task is marked complete. On this last activity, i have several additional options (add note, share, etc..) and i also have a return to main menu button. My question is.. how do i stack the activities so that calling finish() on the final activity will return back to the first activity launched? i am currently just starting the new activity via an intent, so pressing back on this screen doesn't return me to home as i would like. Sorry in advance for being so convoluted in my desc

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• Why doesn't infinite recursion hit a stack overflow exception in F#?

  - by Amazingant

  I know this is somewhat the reverse of the issue people are having when they ask about a stack overflow issue, but if I create a function and call it as follows, I never receive any errors, and the application simply grinds up a core of my CPU until I force-quit it: let rec recursionTest x = recursionTest x recursionTest 1 Of course I can change this out so it actually does something like this: let rec recursionTest (x: uint64) = recursionTest (x + 1UL) recursionTest 0UL This way I can occasionally put a breakpoint in my code and see the value of x is going up rather quickly, but it still doesn't complain. Does F# not mind infinite recursion?

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• Ways to optimize Android App code based on function call stack?

  - by K-RAN

  I've been told that Android OS stores all function calls in a stack. This can lead to many problems and cause the 'hiccups' during runtime, even if a program is functionalized properly, correct? So the question is, how can we prevent this from happening? The obvious solution is to functionalize less, along with other sensible acts such as refraining from excessively/needlessly creating objects, performing static calls to functions that don't access fields, etc... Is there another way though? Or can this only be done through careful code writing on the programmers' part? Does the JVM/JIT automatically optimize the bytecode during compile time to account for this?? Thanks a lot for your responses!!

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• How can i initialize an array without knowing it size?

  - by Sara

  I have a situation where i have to apply a criteria on an input array and reuturn another array as output which will have smaller size based upon the filtering criteria. Now problem is i do not know the size of filtered results, so i can not initialize the array with specific value. And i do not want it to be large size will null values because i am using array.length; later on. One way is to first loop the original input array and set a counter, and then make another loop with that counter length and initialize and fill this array[]. But is there anyway to do the job in just one loop?

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• How much faster are register based architectures than stack architectures?

  - by drozzy

  Studying compilers course, I am left wondering why use registers at all. It is often the case that the caller or callee must save the register value and then restore it. In a way they always end up using the stack anyway. Is creating additional complexity by using registers really worth it? Excuse my ignorance. Update: Please, I know that registers are faster than RAM and other types of cache. My main concern is that one has to "save" the value that is in the register and the "restore" it to. In both cases we are accessing some kind of cache. Would it not be better to use cache in the first place?

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• Is the development stack of java/spring/hibernate/eclipse/tomcat/mysql riddled with config hacking?

  - by Blankman

  From a M$ development perspective, using things like vs.net/c#/asp.net/asp.net mvc/sql server, things are pretty much smooth. (Obviously for someone coming from a microsoft background like me). Now I love the idea of open source, linux and terminal servering into the computer and doing things via the command line, no license issues really, etc. I've tried firing up eclipse etc., but I always seem to get stuck on some configuration issue or another. Does it get easier or is it just the territory when you are dealing with the java stack?

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• How to add a dynamically resolved activity name to the back stack (without using PARENT_ACTIVITY)?

  - by user3214249

  The goal is 1) Start activity A from AppWidgetProvider or any other background task (it is simple). 2) From activity A go to activity B after clicking Back button. The problem is that I can't set PARENT_ACTIVITY in AndroidManifest.xml, because the activity B class name gets determined at run time. So in one case I need to go to activity B, in other case it is another activity. Seems like I can't use TaskStackBuilder without PARENT_ACTIVITY. I could handle this in the finish() method of activity A, but it should be a simpler way to add activity B to the "back stack" when I run startActivity(intent). Any ideas?

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• How do I determine the video file size on youtube in Java?

  - by user1753343

  I am using the youtube-API to gather different information about videos. The only missing attribute until now is size. The API itself doesn't provide any functionality. I googled, but didn't found any solution. Indirect way My next idea was to get the path to the video-file itself and make a get-request. In the response-headers I could check for the file size. So I searched for "video / download / youtube / java". Some time ago youtube used get_video_info but this doesn't work today. I also found an application called JavaYoutubeDownloader but it seems VERY complicated for just getting the file size and it doesn't work either (just prints finish, without downloading anything). So is there a way to get the filesize of a video on youtube by using Java? If not, what would be a practical solution for this problem (a list of video_ids exists)?

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• Why does Term::Size seem to mess up Perl's output encoding?

  - by sid_com

  Hello! The Term::Size-module jumbles up the encoding. How can I fix this? #!/usr/bin/env perl use warnings; use strict; use 5.010; use utf8; binmode STDOUT, ':encoding(UTF-8)'; use Term::Size; my $string = 'Hällö'; say $string; my $columns = ( Term::Size::chars *STDOUT{IO} )[0]; say $columns; say $string; Output: Hällö 140 H?ll?

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• What's the fastest way to get directory and subdirs size on unix using Perl?

  - by ivicas

  I am using Perl stat() function to get the size of directory and its subdirectories. I have a list of about 20 parent directories which have few thousand recursive subdirs and every subdir has few hundred records. Main computing part of script looks like this: sub getDirSize { my $dirSize = 0; my @dirContent = <*>; my $sizeOfFilesInDir = 0; foreach my $dirContent (@dirContent) { if (-f $dirContent) { my $size = (stat($dirContent))[7]; $dirSize += $size; } elsif (-d $dirContent) { $dirSize += getDirSize($dirContent); } } return $dirSize; } The script is executing for more than one hour and I want to make it faster. I was trying with the shell du command, but the output of du (transfered to bytes) is not accurate. And it is also quite time consuming. I am working on HP-UNIX 11i v1.

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• CSS Question - Any way to set (eg. a font-size) to a group of styles, by linking the style to anothe

  - by Joe

  .small_fonts{ font-size:10px; } .fonts_blue{ color:blue; } .fonts_red{ color:red; } .fonts_green{ color:green; } Any way to apply "small_fonts" to each of the "fonts_blue, _red, _green" w/o doing this: .fonts_blue, fonts_red, fonts_green { font-size:10px; } I am just trying to update my css to be more organized. I realised I don't need to define the font-size for each of the "small" fonts. When adding the class btw... I know you can do this: class="small_fonts fonts_blue" ~ however I'm talking about combining within the css stylesheet

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• How to apply dynamically scale down and up into a thumbnail images size?

  - by Qpixo

  I'm working on one current project, I don't have any issues to load a SWF into a main SWF but I can't figure out how to apply dynamically the scale down and up into a thumbnail images size while using the Resize event handler. I load SWF into a Loader object then add it into a container = currentMC. I want to size it and keep all the pieces inside this container. Therefore no matter browser size, I just want to be able to apply scale on it to fit it. Does anyone know how to do that? Any code examples would help me a lot. I'm using Flash.

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• [VC++ 2010] Stack around the variable 'xyz' was corrupted.

  - by tirolerhut

  hi, I'm trying to get some simple piece of code I found on a website to work in VC++ 2010 on windows vista 64: #include "stdafx.h" #include <windows.h> int _tmain(int argc, _TCHAR* argv[]) { DWORD dResult; BOOL result; char oldWallPaper[MAX_PATH]; result = SystemParametersInfo(SPI_GETDESKWALLPAPER, sizeof(oldWallPaper)-1, oldWallPaper, 0); fprintf(stderr, "Current desktop background is %s\n", oldWallPaper); return 0; } it does compile, but when I run it, I always get this error: Run-Time Check Failure #2 - Stack around the variable 'oldWallPaper' was corrupted. I'm not sure what is going wrong, but I noticed, that the value of oldWallPaper looks something like "C\0\:\0\0U\0s\0e\0r\0s[...]" -- I'm wondering where all the \0s come from. A friend of mine compiled it on windows xp 32 (also VC++ 2010) and is able to run it without problems any clues/hints/opinions? thanks

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