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• How do I know which illegal address the program access when a segmentation fault happens

  - by overboming

  Plus, The program runs on a arm device running Linux, I can print out stack info and register values in the sig-seg handler I assign. The problem is I can't add -g option to the source file, since the bug may won't reproduce due to performance downgrade.

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• OpenGL - GL_FRONT versus GL_FRONT_AND_BACK

  - by Drew Noakes

  I'm tinkering with an open source project that uses OpenGL for rendering in 3D. In the construction of the materials I see code like this: // set ambient material reflectance glMaterialfv(GL_FRONT_AND_BACK, GL_AMBIENT, mAmbient); In other examples, this is used: glMaterialfv(GL_FRONT, GL_AMBIENT, mAmbient); So my question is, what is the difference here? Under what circumstances would it look different and, if my volume is enclosed with all normals pointing outwards, is there any performance difference?

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• What is the best way to download files via HTTP using .NET?

  - by Shamika

  In one of my application I'm using the WebClient class to download files from a web server. Depending on the web server sometimes the application download millions of documents. It seems to be when there are lot of documents, performance vise the WebClient doesn't scale up well. Also it seems to be the WebClient doesn't immediately close the connection it opened for the WebServer even after it successfully download the particular document. I would like to know what other alternatives I have.

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• Direct access to harddrive?

  - by user146780

  I was wondering how hard disk access works. Ex, how could I view/modify sectors? Im targeting Windows if that helps. Thanks

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• Using the Android SDK on a Mac, Eclipse is really slow. How can I speed it up?

  - by morais

  I'm using Eclipse + the Android SDK on a Mac running Snow Leopard to develop Android apps. Thing is, Eclipse is really slow - like, it "beach balls" for a few seconds when changing tabs. Is there anything I can do to improve it's performance?

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• CMake: add static library to shared lib

  - by redvarib

  I would like to create shared library with cmake, but also I need to link it to third party static libraries. For example if it should include my own file1.o, file2.o, then statically linked libfoo.la and then be written down to disk as .so file which dynamically linked to libbar.so Is it even possible?

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• Is a display list best for this? (OpenGL)

  - by user146780

  I'm rendering 2D polygons with the GLUTesselator the first time, then they are stored in a display list for subsequent use. I think VBO's might be faster, but since I can't access the stuff that the tesselator outputs, and since it uses mixes of gl_triangle, quad, strip etc, i'm not sure how I could do this, even though I would like to use VBO's once the GLUTesselator is done with them for optimal performance. Thanks

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• Quick question about jQuery selector content efficiency

  - by serg

  I am loading HTML page through ajax and then doing a bunch of searches using selectors: $.ajax({ ... dataType: "html", success: function(html) { $("#id1", html); $(".class", html); //... } } Should I extract $(html) into a variable and use it as a content, or it doesn't matter (from performance point)? success: function(html) { $html = $(html); $("#id1", $html); $(".class", $html); //... }

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• Theoretical minimum round-trip-time for a packet to travel over/under the North Atlantic Sea?

  - by knorv

  I'm doing some performance tuning and capacity planning for a low-latency application and have the following question: What is the theoretical minimum round-trip time for a packet sent between a host in London and one in New York?

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• jQuery limit to 2 decimal places

  - by Michael Pasqualone

  How do I limit the following jQuery return to 2 decimal places? $("#diskamountUnit").val('$' + $("#disk").slider("value") * 1.60); I figure I've got to throw toFixed(2) somewhere into there, but I can't seem to get the ordering right or something.

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• why many programmers use integer literal on left handside of equality operator?

  - by nash

  Hi, Many a times in blogs and books, i have seen conditions in if statements like this: if(0 == a.size()){...} or if(-1 == str.indexOf(ch)){...} Is there any performance advantage in using integer literals on left hand side in conditions or is it just a style that some programmers prefer?

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• How to choose between UUIDs, autoincrement/sequence keys and sequence tables for database primary keys?

  - by Tim

  I'm looking at the pros and cons of these three primary methods of coming up with primary keys for database rows. So assuming I am using a database that supports more than one of these methods, is there a simple heuristic to determine what the best option would be for me? How do considerations such a distributed/multiple masters, performance requirements, ORM use, security and testing have on the choice? Any unexpected drawbacks that one might run into?

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• EclipsePDT: how to add a Drupal project ?

  - by Patrick

  hi, how can I add an Eclipse project to my Eclipse PDT ? I've a Drupal installation on my hard-disk (a subfolder of Eclipse workspace). I've tried create new PHP project from eclipse, but it seems not to work. I've successively tried to import the Drupal project but Eclipse only recognize the SimplyModern project from drupal themes folder, and not the main Drupal project. thanks

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• Download pdf programatically...

  - by Perplexed

  Hi, How can I download a pdf and store to disk using vb.net or c#? The url (of the pdf) has some rediection going on before the final pdf is reached. I tried the below but the pdf seems corrupted when I attempt to open locally, Dim PdfFile As FileStream = File.OpenWrite(saveTo) Dim PdfStream As MemoryStream = GetFileStream(pdfURL) PdfStream.WriteTo(PdfFile) PdfStream.Flush() PdfStream.Close() PdfFile.Flush() PdfFile.Close() many thanks, KS

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• Is there a GUI which will enable me to query an XML file?

  - by Johnny

  hi, I have an XML file which I'd like to query (read/write) in the same way as I would a relational database. Performance is not a big issue, I just want to be able to load the file and start querying, preferably without having to define a schema. Does anyone know if such software exists?

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• How to change the home directory of hudson?

  - by dfdfd

  I deployed hudson.war in the sun application server 9.1. I like to check how can i change the home directory of hudson to point to another directory becasue if using a .hudson directory is not ok as i have very little diskspace left in main disk drive.

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• Checking an empty Core Data relationship (SQLite)

  - by rwat

  I have a to-many relationship in my data model, and I'd like to get all the objects that have no corresponding objects in the relationship. For example: Customer - Purchases I want to get all Customers that have 0 Purchases. I've read somewhere that I could use "Purchases[SIZE] = 0", but this gives me an unsupported function expression error, which I think means it doesn't work with a SQLite backing store (which I don't want to switch from, due to some performance constraints). Any ideas?

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• How do I superimpose one bitmap image on another in GDI+?

  - by Old Man

  Using GDI+ I've made a heatmap bmp and I'd like to superimpose it on top of my bmp map. I've saved the two bmps to disk, and they look good, I just need a way to put them together. Is there any way to do this, perhaps using the Graphics object? How is transparency/alpa involved? I'm very new to GDI programming so please be as specific as possible.

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• clamAV is slowing down my site, is there a solution or substitute?

  - by Scarface

  Hey guys quick question, I just installed clamAV (antivirus) on my apache server (running php and linux) and it is reducing the entire performance of my site drastically for some reason. Does anyone know why this may be or know of a better solution for scanning file uploads?

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• Is there a common practice how to make freeing memory for Garbage Collector easier in .NET?

  - by MartyIX

  I've been thinking if there's a way how to speed up freeing memory in .NET. I'm creating a game in .NET (only managed code) where no significant graphics is needed but still I would like to write it properly in order to not to lose performance for nothing. For example is it useful to assign null value to objects that are not longer needed? I see this in a few samples over Internet. Thanks for answers!

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• Updating an atom with a single value

  - by mikera

  I have a number of atoms in my code where a common requirement is to update them to a new value, regardless of the current value. I therefore find myself writing something like this: (swap! atom-name (fn [_] (identity new-value))) This works but seems pretty ugly and presumably incurs a performance penalty for constructing the anonymous closure. Is there a better way?

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• Find out how much storage a row is taking up in the database

  - by Vaccano

  Is there a way to find out how much space (on disk) a row in my database takes up? I would love to see it for SQL Server CE, but failing that SQL Server 2008 works (I am storing about the same data in both). The reason I ask is that I have a Image column in my SQL Server CE db (it is a varbinary[max] in the SQL 2008 db) and I need to know now many rows I can store before I max out the memory on my device.

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• Application Engineering and Number of Users

  - by Kramii

  Apart from performance concerns, should web-based applications be built differently according to the number of (concurrent) users? If so, what are the main differences for (say) 4, 40, 400 and 4000 users? I'm particularly interested in how logging, error handling, design patterns etc. would be be used according to the number of concurrent users.

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• How to optimize an update SQL that runs on a Oracle table with 700M rows

  - by Bruno Rothgiesser

  UPDATE [TABLE] SET [FIELD]=0 WHERE [FIELD] IS NULL [TABLE] is an Oracle database table with more than 700 million rows. I cancelled the SQL execution after it had been running for 6 hours. Is there any SQL hint that could improve performance? Or any other solution to speed that up?

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• How does JSON compare to XML in terms of file size and serialisation/deserialisation time?

  - by nbolton

  I have an application that performs a little slow over the internet due to bandwidth reasons. I have enabled GZip which has improved download time by a significant amout, but I was also considering whether or not I could switch from XML to JSON in order to squeeze out that last bit of performance. Would using JSON make the message size significantly smaller, or just somewhat smaller? Let's say we're talking about 250kB of XML data (which compresses to 30kB).

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