start new:
tmux
start new with session name:
tmux new -s myname
If you want to clone an svn repository with git-svn but don't want it to push all the existing branches, here's what you should do. | |
* Clone with git-svn using the -T parameter to define your trunk path inside the svnrepo, at the same time instructing it to clone only the trunk: | |
git svn clone -T trunk http://example.com/PROJECT | |
* If instead of cloning trunk you just want to clone a certain branch, do the same thing but change the path given to -T: | |
git svn clone -T branches/somefeature http://example.com/PROJECT |
// derived from http://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Parallel_algorithm | |
function map() { | |
emit(1, // Or put a GROUP BY key here | |
{sum: this.value, // the field you want stats for | |
min: this.value, | |
max: this.value, | |
count:1, | |
diff: 0, // M2,n: sum((val-mean)^2) | |
}); |
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 |
/* gcc iobomb.c -o libiobomb.so -shared -fPIC -lpthread */ | |
#include <assert.h> | |
#include <dlfcn.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <pthread.h> | |
#include <unistd.h> | |
Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.
$ python -m SimpleHTTPServer 8000
// Just before switching jobs: | |
// Add one of these. | |
// Preferably into the same commit where you do a large merge. | |
// | |
// This started as a tweet with a joke of "C++ pro-tip: #define private public", | |
// and then it quickly escalated into more and more evil suggestions. | |
// I've tried to capture interesting suggestions here. | |
// | |
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_, | |
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant, |
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
#!/usr/bin/python | |
# -*- coding: utf-8 -*- | |
import subprocess | |
__all__ = ["transform"] | |
__version__ = '0.3' | |
__author__ = 'Christoph Burgmer <cburgmer@ira.uka.de>' | |
__url__ = 'http://github.com/cburgmer/upsidedown' |
emacs --daemon
to run in the background.
emacsclient.emacs24 <filename/dirname>
to open in terminal
NOTE: "M-m and SPC can be used interchangeably".
C-/
C-?
M-c
2. Upper Case : M-u
M-l