jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

spion

Warning

This benchmark has been misleading for a while. It was originally made to demonstrate how JIT compilers can do all sorts of crazy stuff to your code - especially LuaJIT - and was meant to be a starting point of discussion about what exactly LuaJIT does and how.

As a result, its not indicative of what its performance may be on more realistic data. Differences can be expected because

1. the text will not consist of hard-coded constants

syzdek

#
#   Instructions for making hybrid GPT/MBR boot USB thumb drive.
#   The Slackware Linux installer will be added to the image as an example,
#   however the syslinux configuration can be modified to include any desired
#   image.
#
#   A USB thumb drive formatted with these instructions was able to
#   boot the Slackware Installer on a:
#
#      Dell Latitude E6430 in Legacy BIOS mode

mmalone

"Memcached cache backend"

from django.core.cache.backends import memcached
from django.utils.encoding import smart_unicode, smart_str

MIN_COMPRESS_LEN = 150000

class CacheClass(memcached.CacheClass):
    def add(self, key, value, timeout=None, min_compress_len=MIN_COMPRESS_LEN):
        if isinstance(value, unicode):

stuartsierra

Sample Project

Starting from:

lein new foo
cd foo

Say I have a random JAR file that is not available in any repository:

touch README.md

a-chernykh

class AvatarUploader < CarrierWave::Uploader::Base
  include CarrierWave::MiniMagick

  def extension_white_list
    model.skip_avatar_extension_check ? nil : %w(jpg jpeg gif png bmp)
  end
end

jpetazzo

# this forces dpkg not to call sync() after package extraction and speeds up install
RUN echo "force-unsafe-io" > /etc/dpkg/dpkg.cfg.d/02apt-speedup
# we don't need and apt cache in a container
RUN echo "Acquire::http {No-Cache=True;};" > /etc/apt/apt.conf.d/no-cache

Blankwonder

[Proxy]
TestTLS = https, 192.168.20.6, 443, client-cert=item

[Keystore]
item = password=123456, base64=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

Linusp

import click

@click.command()
@click.option("--age", type=int, default=24, help="你当前的年龄")
@click.option("--asset", type=float, default=0, help="上一年年末总资产")
@click.option("--salary", type=float, default=200000, help="预计今年年工作收入")
@click.option("--salary-rate", type=float, default=0.1, help="预计工作收入年增长率")
@click.option("--invest", type=float, default=10000, help="预计今年投资收入")
@click.option("--invest-rate", type=float, default=0.1, help="预计投资收入年增长率")
@click.option("--expense", type=float, default=90000, help="预计今年支出")

dannypurcell

(defn ignore-trailing-slash
  "Modifies the request uri before calling the handler.
  Removes a single trailing slash from the end of the uri if present.

  Useful for handling optional trailing slashes until Compojure's route matching syntax supports regex.
  Adapted from http://stackoverflow.com/questions/8380468/compojure-regex-for-matching-a-trailing-slash"
  [handler]
  (fn [request]
    (let [uri (:uri request)]
      (handler (assoc request :uri (if (and (not (= "/" uri))