timing

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How to measure CPU cycles per instruction in a C program

I have a C program where I am starting to use some SIMD optimizations for the SPE (Cell processor), etc. I would like somehow to \"time\" how many cycles do they need. One idea is to switch on/off and[详细]

2023-01-23 10:40 分类：问答
Measuring total CPU time of a program that uses precompiled libraries (C++, Linux)

I am currently stumbled into this problem and I\'d love to hear some suggestions from you. I have a C++ program that uses a precompiled library to make some queries to PostgreSQL database. Now the pr[详细]

2023-01-20 20:05 分类：问答
When/where to startUpdatingLocation?

The determination of a position takes some time. When and where should the location manager be started?[详细]

2023-01-19 07:41 分类：问答
winapi threads take time to initialise before message passing works?

I have a main program that creates the threads in order: ThreadB then ThreadA (which is passed ThreadB\'s ID)[详细]

2023-01-18 13:03 分类：问答
slow down gdb to reproduce bug

I have a timing bug in my application which only occurs when I use valgrind, because valgrind slows down the process so much.[详细]

2023-01-18 11:22 分类：问答
sysopen permission denied

I\'m trying to fix an intermittent bug in git-svn. The problem is happening in Windows XP only, with both Cygwin git (perl v5.10.1) and msysGit (perl v5.8.8).[详细]

2023-01-18 01:32 分类：问答
How do I measure how long a (linux C) function takes to execute?

I have a particular function (well, set of functions) that I want to start every 400ms. I\'m not much of a C programmer, and so anything outside of 开发者_开发技巧the standard libraries is a mystery t[详细]

2023-01-16 06:47 分类：问答
Why does my timing code always return 0?

i was optimizing my html5 game engine for performance issues and i want to know how much time a render process needs.So i got a bunch of render function开发者_开发问答s.Each of them render seperated p[详细]

2023-01-15 20:04 分类：问答
Timing accuracy in Flash

Does anyone know how accurate flash timing is and its ability to identify the client monitor\'s refresh rate?I need to be able to calculate time durations with up to 10 milliseconds accuracy of respon[详细]

2023-01-15 18:55 分类：问答
Why does mysql_query() sometimes require 0.1 of a second on a query that executes fast

I’ve noticed that sometimes mysql_query() on particular query in my script executes immediately and sometimes it takes (almost exactly)开发者_StackOverflow中文版 0.1 of a second. I wrote a simple scr[详细]

2023-01-12 18:57 分类：问答