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• What is the motivation behind c++0x lambda expressions?

  - by LoudNPossiblyRight

  I am trying to find out if there is an actual computational benefit to using lambda expressions in c++, namely "this code compiles/runs faster/slower because we use lambda expressions" OR is it just a neat development perk open for abuse by poor coders trying to look cool? Thanks. PS. I understand this question may seem subjective but i would much appreciate the opinion of the community on this matter.

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• Is pitch and speed the same thing in audio programming context?

  - by mystify

  Pitch means "perceived frequency". Nice. But when I make pitch very low in OpenAL, sound plays a lot of times longer. If I make it very high, sound plays very short but with high frequency. For me, logically the consequence of making slower or faster. Or is pitch != speed?

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• what should I take into consideration when choosing a session implementation?

  - by Satoru.Logic

  Hi, all. Yesterday, my supervisor told me that tmp-file-based session should be THE answer to session implementation, and I should abandon any idea of making sessions persistent. He argues that file-based session is much faster and eaiser to use than other choices like db-based or memcached-based implementations. What he said was really a shock to my past learning experience, so please tell me whether he was wrong and why? Thanks in advance.

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• What is a more efficient way in Python to return list elements which are not in a second list?

  - by Hobhouse

  Is there a faster way to do this in python? [f for f in list_1 if not f in list_2] list_1 and list_2 both consist of about 120.000 strings. It takes about 4 minutes to generate the new list.

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• xslt or php for rendering output

  - by Arsenal

  I'm creating something where users can upload an xml and data get's imported to the database. Now I'm building some kind of a preview page where users will get to see how their input will look once it's stored. What would be the fastest (in execution time), using XSL to transform the xml to a html page, or using php to render the output? My guess is XSL is far more suitable (+ faster) for this (and by using a DTD there's no need for code written validation, right?)

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• SQL INSERT performance omitting field names?

  - by Marco Demaio

  Does anyone knows if removing the field names from an INSERT query results in some performance improvements? I mean is this: INSERT INTO table1 VALUES (value1, value2, ...) faster for DB to be accomplished rather than doing this: INSERT INTO table1 (field1, field2, ...) VALUES (value1, value2, ...) ? I know it might be probably a meaningless performance difference, but just to know.

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• MySQL More Tables or More Rows

  - by Pez Cuckow

  I am working on a game that I am going to open to the public to have on their game. The game stores lots of information (about 300 rows) per website and spends a lot of time updating values within this MySQL database. Is it better (faster/efficient) to add a new table for every website or to just have 1000's of rows in one table and add a column "website_id" or similar?

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• Which is more powerful PHP or ASP.NET? [closed]

  - by Starx

  I have been using php for quite few years and now i want to learn ASP.net for web development cause I have found it pretty faster than PHP? Despite Speed, I want to know which has more flexibility, user friendly, easy learning and powerful capability.

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• Fastest possible summing numbers up to N

  - by dada

  Okay so i need really FAST algorithm or code in C if you have any it would be nice. The task is to sum all numbers from 1 to N for a given number N (it can be negative number too), so i did the usual way (you know just summing with loop from 1 to N) but it's not fast enough - i need something faster, i guess that i need the fastest possible way to do this. If anyone could help me, please do. Thanks.

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• C# question to ex-C++/ASM guys. Speed optimisation

  - by maxima120

  Which in C# compiled for x64 is faster? a. int * int; b. if(int < 0) int = -int; c. Math.Abs(int) I need pure theoretical answer. Please do not tell me to write loop and measure it with stopwatch. Thanks

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• How to compare 2 files fast using .NET?

  - by Jeremy Rudd

  Typical approaches recommend reading the binary via FileStream and comparing it byte-by-byte. Would a checksum comparison such as CRC be faster? Are there any .NET libraries that can generate a checksum for a file?

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• How do efficiently display items on Google map in the viewing range of the user?

  - by Cory

  When a user moves the Google map, I would like to display items in the viewing range of the user automatically. How can I efficiently and quickly display the items? I have basic understanding of calling getBounds() method every time the user moves the map, but I am not sure how I can efficiently search and get from my database the items within the lat/lng of the bounds of the current viewport. Is there easier and faster way of doing this?

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• C vs. C++ for performance in memory allocation

  - by Andrei

  Hi, I am planning to participate in development of a code written in C language for Monte Carlo analysis of complex problems. This codes allocates huge data arrays in memory to speed up its performance, therefore the author of the code has chosen C instead of C++ claiming that one can make faster and more reliable (concerning memory leaks) code with C. Do you agree with that? What would be your choice, if you need to store 4-16 Gb of data arrays in memory during calculation?

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• What is the display list in Flash 10? Array? Linked list?

  - by Typeoneerror

  I'm working on a game that has many elements on stage, so I'm looking to optimize my loops. I know that Vector is faster than looping an array, but I'm also in some cases using: while (i < numChildren) getChildAt(i) ...to update sprites. My question is when I use getChildAt, is that accessing an Array or Vector or linked list or other? Should I instead store references to my objects in a Vector and loop through that instead?

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• What is the fastest way to compute sin and cos together?

  - by Danvil

  I would like to compute both the sine and co-sine of a value together (for example to create a rotation matrix). Of course I could compute them separately one after another like a = cos(x); b = sin(x);, but I wonder if there is a faster way when needing both values.

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• matlab and gplot

  - by JPC

  Hi, Im trying to find a way to plot a truss in matlab, i can do it by using an adjacancy matrix and the gplot function, but its very long winded approach especially if there are a lot of nodes connected to one another. Is there a faster way to do this? I'm new to matlab and the programming world any help would be really appreciated. JC

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• NodeIterator vs Xpath for DOM iterating/finding in Javascript

  - by aaron

  Which is better to use when iterating over DOM elements or finding a a set of DOM elements. is Xpath faster?

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• mysql query and index

  - by parm.95

  Does this query will be faster with a index on "t.type1" and "x.type1" or only index on "x.type1" is enought? SELECT t.id, x.id FROM t INNER JOIN x ON x.type1=t.type1 WHERE t.id=1

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• Can one construct a "good" hash function using CRC32C as a base.

  - by DavidD

  Given that SSE 4.2 (Intel Core i7 & i5 parts) includes a CRC32 instruction, it seems reasonable to investigate whether one could build a faster general-purpose hash function. According to this only 16 bits of a CRC32 are evenly distributed. So what other transformation would one apply to overcome that? David

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• Perl :Dumpxs in Data::Dumper

  - by kiruthika

  Hi all, I have went through the source code of Data::Dumper.In this package I didn't understand about Dumpxs.Actually what is the use of this Dumpxs. In net I have searched about this and I read that, it is equal to dump function and it is faster than dump. But I didn't understand well about this.

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• Visual Studio 2008: automatic unloading of disabled project

  - by liori

  Hello, My Visual Studio solution file has lots of build configurations that significantly differ in which projects are enabled, and which are not. I'd like to automatically unload all projects that are turned off in active build configuration to save RAM and make VS faster. Is this possible?

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• How does CouchDB perform for a regularly updated dataset?

  - by Ritesh M Nayak

  I am planning on using CouchDB on a project. But as the querying mechanism involves writing views (which are a lot like indexes on regular RDMBMS's) I was wondering, if the document database keeps getting updated a lot ( a write heavy database) would CouchDB perform well compared to a regular RDBMS? Or do we have to compact/re-index the system occasionally to make it perform faster?

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• Performance with timestamp conditions

  - by Tim Whitlock

  Which of the following is faster, or are they equivalent? (grabbing recent most records from a TIMESTAMP COLUMN) SELECT UNIX_TIMESTAMP(`modified`) stamp FROM `some_table` HAVING stamp > 127068799 ORDER BY stamp DESC or SELECT UNIX_TIMESTAMP(`modified`) stamp FROM `some_table` WHERE UNIX_TIMESTAMP(`modified`) > 127068799 ORDER BY `modified` DESC or even another combination?

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• What's behind the 'system' function in perl?

  - by JohnJohnGa

  i can thought that it will open a shell, execute the parameter (shell command) and return the result in a scalar. But, execute 'system' function in a perl script is faster than a shell command. It will call this command in C? If yes, what's the difference between rmdir foo and system('rmdir foo'); Thanks,

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• design decision between array or object save in database

  - by justjoe

  i code some configuration setting. And need those values to be load, everytime my webapp start. yes, it's somekind autoload setting. But, right now, i have to choose between save it as object or array. is there any different between them when we save them in database ? which one is faster or maintainable or other pro and cons thanks

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