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tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

Frontend Development

Attention: the list was moved to

https://github.com/dypsilon/frontend-dev-bookmarks

This page is not maintained anymore, please update your bookmarks.

G1GC v.s. CMS for Cassandra 2.0

Many people have asked me about using the G1 garbage collector with Cassandra. Since most of my customers are running 2.0 in production the test is with 2.0 for now. Once I script it up I'll re-run the numbers with 2.1.

I also need to re-test with Java 7 and the Oracle JDKs.

TL;DR

Source: https://apple.stackexchange.com/questions/138941/how-do-i-stop-the-adobe-creative-cloud-app-from-auto-launching-on-login

It is loaded by default by /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist.

If you run

launchctl unload -w /Library/LaunchAgents/com.adobe.AdobeCreativeCloud.plist

Here's a list of mildly interesting things about the C language that I learned mostly by consuming Clang's ASTs. Although surprises are getting sparser, I might continue to update this document over time.

There are many more mildly interesting features of C++, but the language is literally known for being weird, whereas C is usually considered smaller and simpler, so this is (almost) only about C.

1. Combined type and variable/field declaration, inside a struct scope [https://godbolt.org/g/Rh94Go]

struct foo {
   struct bar {
 int x;

	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

	-- show running queries (pre 9.2)
	SELECT procpid, age(clock_timestamp(), query_start), usename, current_query
	FROM pg_stat_activity
	WHERE current_query != '<IDLE>' AND current_query NOT ILIKE '%pg_stat_activity%'
	ORDER BY query_start desc;

	-- show running queries (9.2)
	SELECT pid, age(clock_timestamp(), query_start), usename, query
	FROM pg_stat_activity
	WHERE query != '<IDLE>' AND query NOT ILIKE '%pg_stat_activity%'

	import scala.concurrent.{ExecutionContext, Future}
	import spray.routing.{AuthenticationFailedRejection, RequestContext}
	import spray.routing.authentication.{Authentication, ContextAuthenticator}

	/** Token based authentication for Spray Routing.
	*
	* Extracts an API key from the header or querystring and authenticates requests.
	*
	* TokenAuthenticator[T] takes arguments for the named header/query string containing the API key and
	* an authenticator that returns an Option[T]. If None is returned from the authenticator, the request

	import UIKit

	/// Wrapper for the NSNotification userInfo values associated with a keyboard notification.
	///
	/// It provides properties that retrieve userInfo dictionary values with these keys:
	///
	/// - UIKeyboardFrameBeginUserInfoKey
	/// - UIKeyboardFrameEndUserInfoKey
	/// - UIKeyboardAnimationDurationUserInfoKey
	/// - UIKeyboardAnimationCurveUserInfoKey

	--------------------------------------------------------------------------
	# ofed_info -s
	--------------------------------------------------------------------------
	Find Mellanox Adapter Type and Firmware/Driver version
	ConnectX-4 card

	# lspci \| grep Mellanox
	0a:00.0 Network controller: Mellanox Technologies MT27500 Family [ConnectX-3]
	# lspci -vv -s 0a:00.0 \| grep "Part number" -A 3
	# lspci \| grep Mellanox \| awk '{print $1}' \| xargs -i -r mstvpd {}