大约有 37,000 项符合查询结果（耗时：0.0262秒） [XML]
How do the likely/unlikely macros in the Linux kernel work and what is their benefit?
... As regards the fragment "[...]that it is being run in a tight loop", many CPUs have a branch predictor, thus using these macros only helps the first time code is executed or when the history table is overwritten by a different branch with the same index into the branching table. In a tight loop, a...
When to use AtomicReference in Java?
...system call, and your thread will block and be context switched out of the CPU to make way for other processes.
The other option is to use an AtomicRefrence.
public static AtomicReference<String> shared = new AtomicReference<>();
String init="Inital Value";
shared.set(init);
//now we w...
Node.js on multi-core machines
...ents and N processes doing heavy compute tasks and chewing up the other 15 CPUs.
For scaling throughput on a webservice, you should run multiple Node.js servers on one box, one per core and split request traffic between them. This provides excellent CPU-affinity and will scale throughput nearly line...
Mismatch Detected for 'RuntimeLibrary'
.... For example, many of the sources subtly depend upon the latest config.h, cpu.h and cpu.cpp. The "subtlety" is you won't realize you are getting an under-performing class.
An example of under-performing class is BLAKE2. config.h adds compile time ARM-32 and ARM-64 detection. cpu.h and cpu.cpp adds...
Comparison of full text search engine - Lucene, Sphinx, Postgresql, MySQL?
...al performance, then you definitely need a good book about Lucene.
As for CPU & RAM requirements, performing a search in Lucene doesn't task your CPU too much, though indexing your data is, although you don't do that too often (maybe once or twice a day), so that isn't much of a hurdle.
It doe...
Efficient evaluation of a function at every cell of a NumPy array
...ime generated C-function as ufunc
import numba as nb
@nb.vectorize(target="cpu")
def nb_vf(x):
return x+2*x*x+4*x*x*x
It easily beats np.vectorize but also when the same function would be performed as numpy-array multiplication/addition, i.e.
# numpy-functionality
def f(x):
return x+2*x*x...
Why is the JVM stack-based and the Dalvik VM register-based?
...ed design makes very few
assumptions about the target
hardware (registers, CPU features),
so it's easy to implement a VM on a
wide variety of hardware.
Since the operands for instructions
are largely implicit, the object
code will tend to be smaller. This
is important if you're going to be
downloadi...
ZeroMQ的学习和研究（PHP代码实例） - C/C++ - 清泛网 - 专注C/C++及内核技术
...订阅者，必然会丢失掉一部分信息，这是这个模式的一个问题，所谓的 Slow joiner。稍后，会解决这个问题。
d) 但是，如果 Publisher 中途离开，所有的 Subscriber 会 hold 住，等待 Publisher 再上线的时候，会继续接受信息。
ZMQ 的 PipeL...
开源邮件传输代理软件 -- Postfix 介绍 - 开源 & Github - 清泛网 - 专注C/C++及内核技术
...。还有一种情况时，如果postfix在处理邮件过程中遇到了问题，则该值会开始降低。
当接收到的新邮件的数量超过postfix的投递能力时，postfix会暂时停止投递deferred队列中的邮件而去处理新接收到的邮件。这是因为处理新邮件的...
iPhone App 开发第一步：从零到真机调试HelloWorld - 更多技术 - 清泛网 - ...
...！ 最近才开始研究iPhone开发，由于没有Mac，采用的是AMD CPU + Win7 + VMWare之后安装Mac OS X Snow Le... iCc原创，转载请注明出处！
最近才开始研究iPhone开发，由于没有Mac，采用的是AMD CPU + Win7 + VMWare之后安装Mac OS X Snow Leopard，再升级...