In a project I'm working on I ran into the requirement of having some sort of persistent FIFO buffer or pipe in Linux, i.e. something file-like that could accept writes from a process and persist it to disk until a second process reads (and acknowledges) it. The persistence should be both across process restarts as well as OS restarts.
AFAICT unfortunately in the Linux world such a primitive does not exist (named pipes/FIFOs do not persist
| Latency Comparison Numbers | |
| -------------------------- | |
| 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 | |
| Send 1K bytes over 1 Gbps network 10,000 ns 0.01 ms | |
| Read 4K randomly from SSD* 150,000 ns 0.15 ms |
Rich Hickey • 3 years ago
Sorry, I have to disagree with the entire premise here.
A wide variety of experiences might lead to well-roundedness, but not to greatness, nor even goodness. By constantly switching from one thing to another you are always reaching above your comfort zone, yes, but doing so by resetting your skill and knowledge level to zero.
Mastery comes from a combination of at least several of the following:
| //harry huang [huanghui.huang@gmail.com] | |
| // | |
| //After reading the original post [http://jboner.github.com/2008/10/06/real-world-scala-dependency-injection-di.html, ] | |
| //the original cake pattern seems quite verbose for me, and it is quite invasive, so I spent a bit time | |
| //and come up with an improved version of cake pattern, which I call it "Auto Cake DI". It is working | |
| //well with any POST(plain old scala trait)/POSO(plain old scala object) which means that anything can be | |
| //injected without modification or introducing new traits. | |
| /*---------inject trait---------*/ | |
| trait Inject[+T] { def inject: T } |
| (defn commatize [n] | |
| (->> n str reverse (partition-all 3) (interpose \,) flatten reverse (apply str))) |
| # I want this method in ruby-core | |
| def let | |
| yield | |
| end | |
| def fib(i) | |
| let do |n = 1, result = 0| | |
| if i == -1 | |
| result | |
| else |
