In an embedded application (written in C, on a 32-bit processor) with hard real-time constraints, the execution time of critical code (specially interrupts) needs to be constant. How do you insure that time variability is not introduced in the execution of the code, specifically due to the processor's caches (be it L1, L2 or L3)? Note ...
Its not uncommon that I have a program whose performance relies heavily on just a few functions and I want to be able to measure a single loop or code segment's speed down to single-clock precision so that I know whether my changes are actually improving performance or whether I'm just falling for the placebo of "optimized" code. I pers...
Has anyone used the new Java 1.6 JDK tool, VisualVM, to profile a production application and how does the application perform while being profiled? The documentation say that it is designed for both Production and Development use, but based on previous profiling experience, with other profiling tools, I am hesitant. ...
I am writing a simple checkers game in Java. When I mouse over the board my processor ramps up to 50% (100% on a core). I would like to find out what part of my code(assuming its my fault) is executing during this. I have tried debugging, but step-through debugging doesn't work very well in this case. Is there any tool that can tell ...
How do you trace/profile your .NET applications? The MSDN online help mentions Visual Studio Team (which I do not possess) and there is the Windows Performance Toolkit. But, are there other solutions you can recommend? Preferably (of course) a solution that works without changing the code (manually) and that can be integrated in Visual S...
I want to know the memory usage of my Python application and specifically want to know what code blocks/portions or objects are consuming most memory. Google search shows a commercial one is Python Memory Validator. And open source ones are PySizer and Heapy. I haven't tried anyone, so I wanted to know which one is the best considering...
I have a Website that is really slow and "feels" really bad when using it. The server is fine, it's a clientside issue, I assume because too much JavaScript or Image Requests, but since it's not my own Website, I wonder if there is a way to show and profile the Page from within IE. In Firefox, I would use Firebug, Y!Slow and the Web Dev...
I'm a total newbie, but I was writing a little program that worked on strings in C# and I noticed that if I did a few things differently, the code executed significantly faster. So it had me wondering, how do you go about clocking your code's execution speed? Are there any (free)utilities? Do you go about it the old-fashioned way with a...
Do you have any tips for effective profiling using Netbeans? The profiler is quite nice and powerful. I've used it to find problems in some of my Eclipse RCP client applications. However, I get the feeling that I could get some more value out of it. Normally I set it to profile either all my classes (starting with xxx.mydomain) using...
While developing on MySQL I really miss being able to fire up a profiler. I find SQLyog is a good enough replacement for Query Analyzer but have not found a tool that works like SQL profiler. For the MySQL folk who have not seen Microsoft's SQL Profiler, here is a screenshot At my previous job we had a tool that trumped SQL Profile...
I've recently began using dTrace and have noticed just how awesome it is. Its the perfect tool for profiling without placing the burden on programmers to set up hundreds of probes in their applications. I've found some nice one liner and sample scripts here and there, but I was wondering about what scripts, tools and links others might ...
How would one go about profiling a few queries that are being run from an ASP.NET application? There is some software where I work that runs extremely slow because of the database (I think). The tables have indexes but it still drags because it's working with so much data. How can I profile to see where I can make a few minor improvement...
I'd like to find a way to determine how long each function in PHP, and each file in PHP is taking to run. I've got an old legacy PHP application that I'm trying to find the "rough spots" in and so I'd like to locate which routines and pages are taking a very long time to load, objectively. Are there any pre-made tools that allow for t...
Do you use a code profiler? if so, Why? What's your favorite? If not, is there a particular reason you don't? ...
I am working on a web app that uses Perl and I need to look into speeding up portions of the app. I thought I'd start profiling the particular calls for the portion I wish to investigate. I've done some searching on profiling Perl code, but unfortunately most of what I find says that I should run my perl code with -d:DProf myapp from...
I came across this topic today while investigating something very strange. Doing certain things in our Flex app can cause the number of frames rendered to rocket, from 12fps to ~30fps: loaded animations start playing at high speed and the GUI starts to lock up. Since everything I've read on Flex/Flash hammers home the point "the frame r...
I'm looking for good resources to learn and contribute to regarding CLR profiler API knowledge (a.k.a "Extended Reflection"). Got one? Only other question here islink text but it's just a beginning. ...
The rails scirpt script/performance/request require a session script, what is the best way to generate this session script? ...
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. ...
I love the way I can profile a Java/.Net app to find performance bottlenecks or memory problems. For example, it's very easy to find a performance bottleneck looking at the call tree with execution times and invocation counts per method. In SQL Server, I have stored procedures that call other stored procedures that depend on views, which...