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Profiling Django
...he Debug Toolbar made things process. My sql queries were small (30ms) but cpu time was very high (800ms). Another page i was tuning had sql times of 300ms, and cpu time of 8000ms - so i kept trying to find the source of the problem. Turning Django Toolbar off sped things right up. 3 years later, st...
C#位运算符（C#按位与、按位或 等） - 更多技术 - 清泛网 - 专注C/C++及内核技术
...为1的位，新数中相应位为0。
（2）取一个数中某些指定位。
如想要取一个整数a（占2个字节）的低（高）字节，只需将a与八进制的377（177400）按位与即可。
（3）保留某一个数的某一位。
与一个数进行&运算...
提升速度：XP注册表与驱动优化 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...件来提升Windows XP的运行速度!
注册表优化方案
1、启用CPU L2 Cahce
到注册表HKCU_LOCAL_MACHINESYSTEMCurrentControlSetControlSession ManagerMemory Management下，新建Dword值:
SecondLevelDataCache，修改这个值为你的CPU的二级缓存的大小，填写的时候使用...
How do I prevent an Android device from going to sleep programmatically?
...PowerManager.SCREEN_DIM_WAKE_LOCK, "My Tag");
wl.acquire();
// screen and CPU will stay awake during this section
wl.release();
There's also a table on this page that describes the different kinds of wakelocks.
Be aware that some caution needs to be taken when using wake locks. Ensure that you ...
服务器保持大量TIME_WAIT和CLOSE_WAIT的解决方法 - C/C++ - 清泛网 - 专注C/C++及内核技术
...的处理方法混为一谈，以为优化系统内核参数就可以解决问题，其实是不恰当的，优化系统内核参 数解决TIME_WAIT可能很容易，但是应对CLOSE_WAIT的情况还是需要从程序本身出发。现在来分别说说这两种情况的处理方法：
1.服务...
AtomicInteger lazySet vs. set
...ill see it at the next read, because the cache coherence protocol of intel cpu will garantee LazySet works, but the cache line will be updated at the next read, again, the CPU has to be modern enough.
http://sc.tamu.edu/systems/eos/nehalem.pdf
For Nehalem which is a multi-processor platform, the pr...
opengl: glFlush() vs. glFinish()
... spec. The general intent of glFlush() is that after calling it, the host CPU will have no OpenGL-related work to do -- the commands will have been pushed to the graphics hardware. The general intent of glFinish() is that after it returns, no remaining work is left, and the results should be avail...
Google Tag Manager 入门指南 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...有多台服务器，频繁的修改，会涉及到版本发布和部署的问题，非常的不方便。
Step 2：
总是骚扰IT部门的同事不太好，我们决定把这儿的统计脚本独立出来，并放到文件域，如：www.mysite_file.com/track/site_a.js，然后把这个js的引...
What is “overhead”?
...ffer a lot with context. In general, it's resources (most often memory and CPU time) that are used, which do not contribute directly to the intended result, but are required by the technology or method that is being used. Examples:
Protocol overhead: Ethernet frames, IP packets and TCP segments al...
Processing Symbol Files in Xcode
...licate crash reports that happened on that iOS version.
Since symbols are CPU specific, the above only works if you have imported the symbols not only for a specific iOS device but also for a specific CPU type. The currently CPU types needed are armv7 (e.g. iPhone 4, iPhone 4s), armv7s (e.g. iPhone...