I'm a beginner in assembly language and have noticed that the x86 code emitted by compilers usually keeps the frame pointer around even in release/optimized mode, when it could use the EBP register for something else. I undertand why the frame pointer might make code easier to debug, and might be necessary if alloca() is called within a...
In the example below, can anyone tell me how to make "slow response when clicked" respond more quickly without modifying appendContent()? I'm wondering if there's a way to place cheap operations before more expensive ones, and make sure the cheap ones actually get carried out quickly. <div id="draw">slow response when clicked</div> <di...
I'm working on a web application import program. Currently an admin user can upload a formatted csv file that my page will parse. I'm experiencing an execution duration issue as each line pertains to a file that has to be saved to Scribd, S3, as well as some internal processing. What would you guys recommend for improving execution...
I understand that there is a resource hit from using RTTI, but how big is it? Everywhere I've looked just says that "RTTI is expensive," but none of them actually give any benchmarks or quantitative data reguarding memory, processor time, or speed. So, just how expensive is RTTI? I might use it on an embedded system where I have only ...
I have D2 program that, in its current form, is single threaded, and calls the same pure function about 10 to 100 times in an inner loop for each iteration of the outer loop of this program. There is no data dependency among the calls, i.e. no call uses the result from any other call. Overall, this function is called millions of times,...
Hi, I'm working on a .net portal which would be having lots of concurrent users. so scalability,performance need to be addressed in the design and architecture. We plan to use load balancing in the application. Keeping this in mind,what would be the best way of communicating between IIS web server(hosting aspx,aspx.cs files) and applic...
I've got a fairly large string (~700k) against which I need to run 10 regexes and count all the matches of any of the regexes. My quick and dirty impl was to do something like re.search('(expr1)|(expr2)|...'), but I was wondering if we'd see any performance gains by matching in a loop instead: In other words, I want to compare the perf...
I'm having problems getting UI code to perform at all well in IE. I have a table - a matrix of values. Each cell can be empty or hold a list of items. I want users to be able to drag items between cells. So my HTML looks something like this: <table> <tr><td></td><th scope="col">col 1</th><th scope="col">col 2</th></tr> <tr><t...
Perfmon is a Windows utility that helps the developer to find bottlenecks in his applications, by measuring system counters. I was reading a perfmon tutorial and from this list of essential counters I have found the following ones on my machine: PhysicalDisk\Bytes/sec_Total Network Interface\Bytes Total/Sec\nic name But I haven't fo...
I have a single buffer, and several pointers into it. I want to sort the pointers based upon the bytes in the buffer they point at. qsort() and stl::sort() can be given custom comparision functions. For example, if the buffer was zero-terminated I could use strcmp: int my_strcmp(const void* a,const void* b) { const char* const one ...
In lighthttpd, when I set: server.network-backend = "freebsd-sendfile" the file upload just hangs for files > ~1MB, but if I change it to: server.network-backend = "writev" It seems to work fine, but I'm getting lower performance by using that setting. Is there a better solution? ...
Hi We are experiencing some difficulties with SQL Server performance and wanted some help. Our environment is: - Windows 2003 Enterprise x64 Edition R2 Intel E5450 Quad Core 3ghz Processor 16GB RAM SQL Server 2005 64bit Enterprise Edition (9.00.3282.00) Database compatibility is 8 (but tested on 9 as well) Hyperthreading is switched ...
In a previous question about formatting a double[][] to CSV format, Marc Gravell said that using StringBuilder would be faster than String.Join. Is this true? ...
As our servers gets busier I'm increasingly interesting in monitor what's going on over time, we have some our host offers some crappy graphs which show CPU usage and Memory over time but there not really telling me much. What sort of high performance tools are available to accurately monitor Apache? ...
I'm working on a project that is going to make heavy use of JBoss Messaging (JMS). I'm tasked with building an easy to use wrapper around Messaging for other developers and am thinking about using JMS's Message Selectors to provide a filtering technique to keep unnecessary sending of messages to a minimum. I'm curious if anyone has any e...
My Java (non-Web) application may have to create Connection Pools of about 200 different Datasources. Yes, all 200 of them connecting to different Databases. Not 200 connections in the pool. Here are some questions that are bugging me.. 1) Should I anticipate major (performance etc. issues? 2) Are there any Non-commercial Java tools ...
I'm developing a Silverlight application that displays items in a listbox control and I've run into a bit of a performance issue. Each item in the listbox is a custom stackpanel with some formatted text and such. When I've got a list of 500 or less items the listbox works fine, but loading more than this causes problems. At 1000 items,...
(Database: Oracle 10G R2) It takes 1 minute to insert 100,000 records into a table. But if the table already contains some records (400K), then it takes 4 minutes and 12 seconds; also CPU-wait jumps up and “Free Buffer Waits” become really high (from dbconsole). Do you know what’s happing here? Is this because of frequent table extents...
Hello everyone, In my Visual Studio, even I just wrote a single line of return in a C# console application, it will take me a minute after pressing F5 to execute the actual code (I mean the time it takes to stop on the single return statement after pressing F5 -- I set a breakpoint on return statement in Main function). I am wondering w...
Hello stackoverflow, I need to speed up some particle system eye candy I'm working on. The eye candy involves additive blending, accumulation, and trails and glow on the particles. At the moment I'm rendering by hand into a floating point image buffer, converting to unsigned chars at the last minute then uploading to an OpenGL texture. ...