| In [19]: fd = os.open('t1', os.O_CREAT | os.O_DSYNC | os.O_WRONLY) | |
| In [20]: %timeit os.write(fd, 'a') | |
| 1000 loops, best of 3: 232 us per loop | |
| In [21]: fd2 = os.open('t2', os.O_CREAT | os.O_SYNC | os.O_WRONLY) | |
| In [22]: %timeit os.write(fd2, 'a') | |
| 1000 loops, best of 3: 737 us per loop | |
| import os | |
| import sys | |
| def my_system(command): | |
| pid = os.fork() | |
| if pid == -1: | |
| return -1 | |
| elif pid == 0: | |
| os.execv('/bin/sh', ['/bin/sh', '-c', command]) |
method1-6 are taken from this article
method7 is added because I believe using generator expression would be faster
to run this experiment, you'll need to install line_profiler, memory_profiler and psutil first, all of which are just one pip install away.
after installing these profiling tools, we can run stest.py like this:
kernprof.py -l -v stest.py method1
| (function () { | |
| var hot_movies = document.querySelectorAll('.ui-slide-item'); | |
| [].forEach.call( | |
| hot_movies, | |
| function (e) { | |
| var rate = e.getAttribute('data-rate'); | |
| rate = parseInt(rate, 10); | |
| if (!isNaN(rate) && rate < 7) { | |
| e.remove(); | |
| } |
| [etcd] Jul 31 03:41:53.475 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:42:24.976 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:44:00.477 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:44:32.225 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:45:36.475 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:46:10.975 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:46:43.976 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:47:12.563 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: warning: heartbeat time out peer="86a6adecb8c | |
| [etcd] Jul 31 03:47:16.475 INFO | 20634ec121f9479ca7a6cd50a5efcc0b: |
| $ mtr -u --report -c 10 douban.com | |
| Start: Sat Jan 3 09:57:13 2015 | |
| HOST: diablo Loss% Snt Last Avg Best Wrst StDev | |
| 1.|-- 10.255.254.34 0.0% 10 0.4 0.4 0.3 0.6 0.0 | |
| 2.|-- 203.90.233.1 0.0% 10 1.0 1.3 0.7 4.8 1.1 | |
| 3.|-- 202.97.122.101 0.0% 10 4.8 3.5 1.7 5.4 1.2 | |
| 4.|-- 202.97.61.37 0.0% 10 39.9 39.0 37.5 40.9 0.8 | |
| 5.|-- 202.97.53.233 0.0% 10 38.9 39.7 38.5 40.9 0.5 | |
| 6.|-- 202.97.53.93 0.0% 10 37.6 39.9 37.6 42.5 1.7 | |
| 7.|-- ??? 100.0 10 0.0 0.0 0.0 0.0 0.0 |
| import random | |
| import datetime as dt | |
| import requests | |
| from pyquery import PyQuery as pq | |
| s = requests.Session() | |
| d = {'form_email': 'xxx', 'form_password': 'yyy'} | |
| today = dt.datetime.today() | |
| login_url = 'https://accounts.douban.com/login' |
| import random | |
| def setup_doors(): | |
| doors = [0] * 3 | |
| doors[random.choice(range(3))] = 1 | |
| return doors | |
| def select(): | |
| return random.choice(range(3)) |
| s = "s = {:c}{}{:c}{:c}print(s.format(34, s, 34, 10))" | |
| print(s.format(34, s, 34, 10)) |
| In [74]: timeit.timeit(stmt='del dll[10000]', setup='from collections import deque;dll = deque(range(10**5))', number=100) | |
| Out[74]: 0.002535041014198214 | |
| In [75]: timeit.timeit(stmt='del l[10000]', setup='l = list(range(10**5))', number=100) | |
| Out[75]: 0.006009762000758201 |