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List comprehension vs map
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map may be microscopically faster in some cases (when you're NOT making a lambda for the purpose, but using the same function in map and a listcomp). List comprehensions may be faster in other cases and most (not all) pythonistas consider them more dir...
Comparison of full text search engine - Lucene, Sphinx, Postgresql, MySQL?
... wish, and give specific fields higher weightings.
Indexing speed is super-fast, because it talks directly to the database. Any slowness will come from complex SQL queries and un-indexed foreign keys and other such problems. I've never noticed any slowness in searching either.
I'm a Rails guy, so I'...
Getting a list of all subdirectories in the current directory
...sively and/or all files recursively, have a look at this function, that is faster than os.walk & glob and will return a list of all subfolders as well as all files inside those (sub-)subfolders: https://stackoverflow.com/a/59803793/2441026
In case you want only all subfolders recursively:
def ...
not None test in Python [duplicate]
...e
...
>>> import dis
>>> dis.dis(f)
2 0 LOAD_FAST 0 (val)
3 LOAD_CONST 0 (None)
6 COMPARE_OP 3 (!=)
9 POP_JUMP_IF_FALSE 16
3 12 LOAD_GLOBAL 1 (True)
...
Fast permutation -> number -> permutation mapping algorithms
...k
skip to section 10.1.1.1 ("Computation with large arrays" p.235) for the fast method.
The (GPLed, C++) code is on the same web page.
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Why dict.get(key) instead of dict[key]?
...,"from __main__ import lookup"))
16.16223979
As we can see the lookup is faster than the get as there is no function lookup. This can be seen through dis
>>> def lookup(d,val):
... return d[val]
...
>>> def getway(d,val):
... return d.get(val)
...
>>> dis.dis(...
Why is Swift compile time so slow?
...mization' in the 'Swift Compiler - Code Generation' build setting. Select 'Fast, Whole Module Optimization'
In 'Swift Compiler - Custom Flags', for your development builds, add '-Onone'
When these flags are set, the compiler will compile all Swift files in one step. We found with our merge...
tcp加速技术解决方案 - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...使用tcp的ehash表，这样就大幅度减少了listener锁的竞争。
Fastsocket
Fastsocket是新浪开源的，并在生产环境部署的一个内核优化版本
使用的时候，只需要启动时指定LD_PRELOAD环境变量，使用它的动态库来替换原生socket接口。 容易...
What is the difference between mutex and critical section?
...on - Uncontended acquires, which should be the common case, are incredibly fast. In the case of contention, they enter the kernel to wait on some synchronization primitive (like an event or semaphore).
I wrote a quick sample app that compares the time between the two of them. On my system for 1,0...
Get a random boolean in python?
I am looking for the best way (fast and elegant) to get a random boolean in python (flip a coin).
8 Answers
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