| 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 |
| * Only the releases of the stable versions are listed in principle. The releases of the unstable versions especially considered to be important are indicated as "not stable." | |
| * The branches used as the source of each releases are specified, and the branching timing of them are also shown. BTW, before subversionizing of the repository, the term called "trunk" was not used, but this list uses it in order to avoid confusion. | |
| * In order to show a historical backdrop, big conferences (RubyKaigi, RubyConf and Euruko) are also listed. About the venues of such conferences, general English notations are adopted, in my hope. | |
| * ruby_1_8_7 branch was recut from v1_8_7 tag after the 1.8.7 release because of an accident. | |
| * 1.2.1 release was canceled once, and the 2nd release called "repack" was performed. Although there were other examples similar to this, since the re-releases were performed during the same day, it does not write clearly in particular. | |
| * Since 1.0 was released with the date in large quantities, the mi |
| ######################### | |
| # .gitignore file for Xcode4 and Xcode5 Source projects | |
| # | |
| # Apple bugs, waiting for Apple to fix/respond: | |
| # | |
| # 15564624 - what does the xccheckout file in Xcode5 do? Where's the documentation? | |
| # | |
| # Version 2.6 | |
| # For latest version, see: http://stackoverflow.com/questions/49478/git-ignore-file-for-xcode-projects | |
| # |
| /** | |
| * Several macros simplifying use of weak references to self inside blocks | |
| * which goal is to reduce risk of retain cycles. | |
| * | |
| * Example: | |
| * @code | |
| @interface Example : NSObject{ | |
| int _i; | |
| } |
| // | |
| // NBResponderChainUtilities.h | |
| // | |
| // Created by Nicolas @ bou.io on 19/04/13. | |
| // | |
| #import <UIKit/UIKit.h> | |
| @interface UIView (NBResponderChainUtilities) | |
| - (UIView*) nb_firstResponder; // Recurse into subviews to find one that responds YES to -isFirstResponder |
| // Taken from the commercial iOS PDF framework http://pspdfkit.com. | |
| // Copyright (c) 2014 Peter Steinberger, PSPDFKit GmbH. All rights reserved. | |
| // Licensed under MIT (http://opensource.org/licenses/MIT) | |
| // | |
| // You should only use this in debug builds. It doesn't use private API, but I wouldn't ship it. | |
| // PLEASE DUPE rdar://27192338 (https://openradar.appspot.com/27192338) if you would like to see this in UIKit. | |
| #import <objc/runtime.h> | |
| #import <objc/message.h> |
| " copy all this into a vim buffer, save it, then... | |
| " source the file by typing :so % | |
| " Now the vim buffer acts like a specialized application for mastering vim | |
| " There are two queues, Study and Known. Depending how confident you feel | |
| " about the item you are currently learning, you can move it down several | |
| " positions, all the way to the end of the Study queue, or to the Known | |
| " queue. | |
| " type ,, (that's comma comma) |
##ss-redir 的 iptables 配置(透明代理)
透明代理指对客户端透明，客户端不需要进行任何设置就使用了网管设置的代理规则
创建 /etc/ss-redir.json 本地监听 7777
运行ss-redir -v -c /etc/ss-redir.json
iptables -t nat -N SHADOWSOCKS
# 在 nat 表中创建新链
iptables -t nat -A SHADOWSOCKS -p tcp --dport 23596 -j RETURN
# 23596 是 ss 代理服务器的端口，即远程 shadowsocks 服务器提供服务的端口，如果你有多个 ip 可用,但端口一致，就设置这个
Unfortunately, xcode does not yet have support for importing OSX crash logs and symbolizing them. Therefore, you must use the command line and a little bit of manual work.
