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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...
做了个"外卖菜单选择器"App，才发现ListView和Spinner的区别这么...
...个组件就完事，结果在"用什么组件展示列表"这个问题上卡了整整两个小时——ListView还是Spinner？看着都差不多，实际用起来差别真不小。
需求分析
餐馆老板（也就是我妈）的要求：
• 菜品按分类展示，至少30道...
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...
程序员之网络安全系列（六）：动态密码 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...
程序员之网络安全系列（五）：数字证书以及12306的证书问题 我们使用了数字证书，确保了对方的公钥身份，也就是互联网中确定了要访问的网站就是你要访问的网站。
但是我们如何确定要访问这个网站的用户就是要访问的用...
Python multiprocessing PicklingError: Can't pickle
... a database, writing to filesystems) then your code is likely not bound by CPU and won't take much of a hit. In fact I've found when writing HTTP/HTTPS benchmarks that the threaded model used here has less overhead and delays, as the overhead from creating new processes is much higher than the overh...
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...
AI助手重构版问题记录 - AI 助手 - 清泛IT社区，为创新赋能！
...已拒绝添加
已经添加的是 BluetoothLE1，请系统解决这个问题❌ 失败 1 项：
• AI 生成的 JSON 格式有误（可能括号/引号不匹配），请重新发送需求让 AI 重新生成
[{"action": "ADD_BLOCK_INTENT","intent":[{"var": "isConnected","init":false},{"event...
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...