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Is there a generator version of `string.split()` in Python?
...
This is because memory is slower than cpu and in this case, the list is loaded by chunks where as all the others are loaded element by element. On the same note, many academics will tell you linked lists are faster and have less complexity while your computer wil...
Convert a String In C++ To Upper Case
...ry/cache effects: data is hot in L1 cache the whole time, and we're purely CPU-bound.
boost::to_upper_copy<char*, std::string>(): 198.0s. Yes, Boost 1.58 on Ubuntu 15.10 is really this slow. I profiled and single-stepped the asm in a debugger, and it's really, really bad: there's a dynam...
Lua简明教程 - 更多技术 - 清泛网 - 专注C/C++及内核技术
...浮点数会慢（除非大于100,000,000,000,000），或是会有精度问题。
你可以以如下的方式表示数字，0x开头的16进制和C是很像的。
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num = 1024
num = 3.0
num = 3.1416
num = 314.16e-2
num = 0.31416E1
num = ...
PostgreSQL - fetch the row which has the Max value for a column
...xxx_cost values), which is a weighed function estimate of required I/O and CPU resources; you can obtain this by firing up PgAdminIII and running "Query/Explain (F7)" on the query with "Query/Explain options" set to "Analyze"
Quassnoy's query has a cost estimate of 745k (!), and completes in 1.3 s...
关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
...程来处理的 IO 模型，但是效率相对比较差，也很容易出问题，所以暂时不做介绍了）。在这些多路复用的模式中，异步阻塞/非阻塞模式的扩展性和性能最好。
引入阻塞/非阻塞,、同步/异步比喻很形象的一段话：
有A，B，C，D...
Wrapping synchronous code into asynchronous call
...ous API for it.
I'll proceed with the assumption that your "service" is a CPU-bound operation that must execute on the same machine as the web server.
If that's the case, then the next thing to evaluate is another assumption:
I need the request to execute faster.
Are you absolutely sure that...
How does Duff's device work?
... whether the loop is finished and jumping back to the top of the loop. The CPU can run faster when it's executing straight-line code instead of jumping.
The second aspect is the switch statement. It allows the code to jump into the middle of the loop the first time through. The surprising part to m...
Why can't enum's constructor access static fields?
...e problem solved via a nested class. Pros: it's shorter and also better by CPU consumption. Cons: one more class in JVM memory.
enum Day {
private static final class Helper {
static Map<String,Day> ABBR_TO_ENUM = new HashMap<>();
}
Day(String abbr) {
this.a...
How does this milw0rm heap spraying exploit work?
...e chunk, the probability of jumping there is high). When we jump there the CPU will keep executing or cl, [edx] instructions until in reaches the beginning of shellcode that's put in memory.
I've disassembled the shellcode:
00000000 C9 leave
00000001 2B1F sub ebx,[edi...
multiprocessing: sharing a large read-only object between processes?
... the time that
Process.start() was called.
Example
On Windows (single CPU):
#!/usr/bin/env python
import os, sys, time
from multiprocessing import Pool
x = 23000 # replace `23` due to small integers share representation
z = [] # integers are immutable, let's try mutable object
def printx(...