Are there any major differences in performance between http and https? I seem to recall reading that https can be up to 1/5 times slower than http. Is this valid with the current generation webservers/browsers? If so, are there any whitepapers to support it? ...
The IT department where I work is trying to move to 100% virtualized servers, with all the data stored on a SAN. They haven't done it yet, but the plan eventually calls for moving the existing physical SQL Server machines to virtual servers as well. A few months ago I attended the Heroes Happen Here launch event, and in one of the SQL ...
I have a couple variants of a program that I want to compare on performance. Both perform essentially the same task. One does it all in C and memory. The other calls an external utility and does file IO. How do I reliably compare them? 1) Getting "time on CPU" using "time" favors the second variant for calling system() and doing IO. ...
The project I'm working on needs to render an ESRI shape file, which can have a large number of polygons/shapes. When I add all these polygons, lines, points, etc to the canvas I'm using, it gets really slow. To draw the shapes on the map, I'm creating a Path object, and setting it's Data property to a StreamGeometry. I originally use...
It's clear that a search performance of the generic HashSet<T> class is higher than of the generic List<T> class. Just compare the hash-based key with the linear approach in the List<T> class. However calculating a hash key may itself take some CPU cycles, so for a small amount of items the linear search can be a real alternative to the...
I'm currently working on a project for medical image processing, that needs a huge amount of memory. Is there anything I can do to avoid heap fragmentation and to speed up access of image data that has already been loaded into memory? The application has been written in C++ and runs on Windows XP. EDIT: The application does some prepro...
I want to watch a folder tree on a network server for changes. The files all have a specific extension. There are about 200 folders in the tree and about 1200 files with the extension I am watching. I can't write a service to run on the server (off-limits!) so the solution has to be local to the client. Timeliness is not particularly im...
What good profilers do you know? What is a good way to measure and tweak the performance of a C++ MFC application? Is Analysis of algorithms really neccesary? http://en.wikipedia.org/wiki/Algorithm_analysis ...
Hello, I have to concatenate a bunch of Strings in Javascript and am searching for the fastest way to do so. Let's assume that the Javascript has to create a large XML-"file" that, naturally, consists of many small Strings. So I came up with: var sbuffer = []; for (var idx=0; idx<10000; idx=idx+1) { sbuffer.push(‘<xmlta...
What would be the best method of recording to a log(.txt) from a console program? My program loops multiple times always outputting different data based on what the user wants, so im searching for the best, most efficient way to achieve this. i know i can always reopen a stream and then close it, but everytime i do that it would be writ...
To give an example of the kind of request that I can't figure out what else to do for: The application is a bowling score/stat tracker. When someone enters their scores in advanced mode, a number of stats are calculated, as well as their score. The data is modeled as: Game - members like name, user, reference to the bowling alley, sc...
I asked a question about Lua perfromance, and on of the responses asked: Have you studied general tips for keeping Lua performance high? i.e. know table creation and rather reuse a table than create a new one, use of 'local print=print' and such to avoid global accesses. This is a slightly different question from Lua Patterns,Tips ...
I've recently come across a feature of doing a large query in oracle, where changing one thing resulted in a query that used to take 10 minutes taking 3 hours. To briefly summarise, I store a lot of coordinates in the database, with each coordinate having a probability. I then want to 'bin' these coordinates into 50 metre bins (basicall...
I'm using a medical records system built on an Oracle database. Our vendor just told us that we need to shut down Oracle's Enterprise Manager service when we're not using it, because it uses too much of the system's resources. I know I can get actual numbers by checking Sysinternals Process Explorer, but I was hoping that someone can giv...
Has anyone done any sort of performance tests against MSMQ? We have a solution in prod environment where errors are added to a MSMQ for distribution to databases or event monitors. We need to test the capacity of this system but not sure how to start. Anyone know any tools or have any tips? ...
I'm writing an application which reads large arrays of floats and performs some simple operations with them. I'm using floats because I thought it'd be faster than doubles, but after doing some research I've found that there's some confusion about this topic. Can anyone elaborate on this? Thanks. ...
This question may sound fairly elemental, but this is a debate I had with another developer I work with. I was taking care to stack allocate things where I could, instead of heap allocating them. He was talking to me and watching over my shoulder and commented that it wasn't necessary because they are the same performance wise. I was a...
When running performance tests file system cache hit or miss can significantly influence test results. Therefore generally before running such tests used files are evicted from system cache. How to do that on Linux? Clarification: If possible, the solution should not require root privileges. ...
I don't want a discussion about when to and not to throw exceptions. I wish to resolve a simple issue. 99% of the time the argument for not throwing exceptions revolves around them being slow while the other side claims (with benchmark test) that the speed is not the issue. I've read numerous blogs, articles, and posts pertaining one sid...
Just how much slower are events? I have written a streaming XML parser (that can handle open-ended and incomplete documents) and by tearing out the events and using an interface instead I got a significant speed boost. Does any one else have any war stories? (Let's not open the GC can of worms here, we all know it's broken :)) ...