tonyc

Using strace and lsof to debug blocked processes

You can use strace on a specific pid to figure out what a specific process is doing, e.g.:

strace -fp <pid>

You might see something like:

select(9, [3 5 8], [], [], {0, 999999}) = 0 (Timeout)

hellerbarde

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = git@github.com:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

hayajo

ChangeLog を支える英語

ChangeLog を書く際によく使われる英語をまとめました。

ほとんど引用です。

基本形

klange

Since this is on Hacker News and reddit...

• No, I don't distribute my résumé like this. A friend of mine made a joke about me being the kind of person who would do this, so I did (the link on that page was added later). My actual résumé is a good bit crazier.
• I apologize for the use of _t in my types. I spend a lot of time at a level where I can do that; "reserved for system libraries? I am the system libraries".
• Since people kept complaining, I've fixed the assignments of string literals to non-const char *s.
• My use of type * name, however, is entirely intentional.
• If you're using an older compiler, you might have trouble with the anonymous unions and the designated initializers - I think gcc 4.4 requires some extra braces to get them working together. Anything reasonably recent should work fine. Clang and gcc (newer than 4.4, at le

nurse

ぼくの考えた最強のRuby新機能案

野心的な新機能案や、互換性等の理由でおよそ採用されないであろう夢を書き連ねています。

Remove Fixnum and Bignum

Fixnum と Bignum を削除して、Integer クラスに統合する。両者は Flonum のように内部的に切り替えられる。

1 / 2 is Rational

Integer#/ の結果を Rational で返すようにする。 https://bugs.ruby-lang.org/issues/5512#change-37021

mochiz

rbenvとruby-buildでRuby環境を最新に保つ

更新日:2014/11/19

rbenv, ruby-buildを更新

$ cd ~/.rbenv
$ git pull origin master
$ cd ~/.rbenv/plugins/ruby-build
$ git pull origin master

felixbuenemann

_docker_procs()
{
  local procs
  procs="$(docker ps -q)"
  COMPREPLY=( $(compgen -W "${procs}" -- ${cur}) )
}

_docker_imgs()
{
  local repos tags imgs

yssk22

Docker Overview

こんな人に有効

• Linux 使ってるけど vagrant とか Virtual Box とか時間かかってめんどい
• VM 作りまくって何が何だかわからなくなった
• Warden が動かない, Buildpack なにそれおいしいの?
• Go!

note: Ubuntu 12.04 (linux-image-3.8.0-23-generic) 使ってます。 Kernel 3.5 以前では安定しない模様。

wsargent

303 See Other

Location: https://github.com/wsargent/docker-cheat-sheet

Hi there!

The docker cheat sheet has moved to a Github project under https://github.com/wsargent/docker-cheat-sheet.

Please click on the link above to go to the cheat sheet.