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jboner / latency.txt
Last active March 21, 2023 10:31
Latency Numbers Every Programmer Should Know
View latency.txt
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
@jboner
jboner / akka-cluster-implementation-notes.md
Last active March 4, 2023 22:30
Akka Cluster Implementation Notes
View akka-cluster-implementation-notes.md

Akka Cluster Implementation Notes

Slightly disorganized but reasonably complete notes on the algorithms, strategies and optimizations of the Akka Cluster implementation. Could use a lot more links and context etc., but was just written for my own understanding. Might be expanded later.

Links to papers and talks that have inspired the implementation can be found on the 10 last pages of this presentation.

Akka Gossip

Gossip state

This is the Gossip state representation:

@jboner
jboner / typesafe-project-and-developer-guidelines.md
Last active October 9, 2022 21:58
Typesafe Project & Developer Guidelines
View typesafe-project-and-developer-guidelines.md

Typesafe Project & Developer Guidelines

These guidelines are meant to be a living document that should be changed and adapted as needed. We encourage changes that makes it easier to achieve our goals in an efficient way.

These guidelines mainly applies to Typesafe’s “mature” projects - not necessarily to projects of the type ‘collection of scripts’ etc.

General Workflow

This is the process for committing code into master. There are of course exceptions to these rules, for example minor changes to comments and documentation, fixing a broken build etc.

@jboner
jboner / how-akka-maps-to-eai-patterns.txt
Last active October 9, 2022 21:57
How Akka maps to EAI Patterns
View how-akka-maps-to-eai-patterns.txt
# How Akka maps to EAI Patterns
Might be up for debate or just plain wrong. Just some notes I scribbled down some time ago.
-----------------------------------------------------------------------------------------------------------------
EAI PATTERN AKKA PATTERN REFERENCE
-----------------------------------------------------------------------------------------------------------------
Point to Point Channel Regular Actor Communication http://www.eaipatterns.com/PointToPointChannel.html
Event-Driven Consumer Regular Actor Receive http://www.eaipatterns.com/EventDrivenConsumer.html
Message Selector Actor with Stash http://www.eaipatterns.com/MessageSelector.html
@jboner
jboner / OrderManagement.java
Created November 10, 2017 09:06
Demo of an Event-driven Architecture in Akka and Java. Show-casing Events-first DDD, Event Sourced Aggregates, Process Manager, etc.
View OrderManagement.java
package sample.eventdriven.java;
import akka.actor.*;
import akka.persistence.AbstractPersistentActor;
import scala.concurrent.duration.Duration;
import java.io.Serializable;
import java.util.concurrent.TimeUnit;
import java.util.concurrent.TimeoutException;
@jboner
jboner / .ctags
Created February 17, 2012 18:50
Scala CTags config file
View .ctags
--langdef=Scala
--langmap=Scala:.scala
--regex-Scala=/^[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/c,classes/
--regex-Scala=/^[ \t]*object[ \t]*([a-zA-Z0-9_]+)/\1/o,objects/
--regex-Scala=/^[ \t]*trait[ \t]*([a-zA-Z0-9_]+)/\1/t,traits/
--regex-Scala=/^[ \t]*case[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/r,cclasses/
--regex-Scala=/^[ \t]*case[ \t]*object[ \t]*([a-zA-Z0-9_]+)/\1/r,cobjects/
--regex-Scala=/^[ \t]*abstract[ \t]*class[ \t]*([a-zA-Z0-9_]+)/\1/a,aclasses/
--regex-Scala=/^[ \t]*def[ \t]*([a-zA-Z0-9_=]+)[ \t]*.*[:=]/\1/m,methods/
--regex-Scala=/[ \t]*val[ \t]*([a-zA-Z0-9_]+)[ \t]*[:=]/\1/V,values/
@jboner
jboner / OrderManagement.scala
Created November 10, 2017 09:08
Demo of an Event-driven Architecture in Akka and Scala. Show-casing Events-first DDD, Event Sourced Aggregates, Process Manager, etc.
View OrderManagement.scala
package sample.eventdriven.scala
import akka.actor.{Actor, ActorRef, ActorSystem, Inbox, Props}
import akka.persistence.PersistentActor
import scala.concurrent.ExecutionContext.Implicits._
import scala.concurrent.duration._
// ===============================================================
// Demo of an Event-driven Architecture in Akka and Scala.
@jboner
jboner / Transactors: Actors and STM
Created July 30, 2009 14:37
Transactors: Actors + STM
View Transactors: Actors and STM
Transactors: Actors + STM
Actors are excellent for solving of problems where you have many independent processes
that can work in isolation and only interact with other Actors through message passing.
This model fits many problems. But the actor model is unfortunately a terrible model for
implementing truly shared state. E.g. when you need to have consensus and a stable view of
state across many components. The classic example is the bank account to clients to
deposits and withdrawals in which each operation needs to be atomic. For detailed
discussion on the topic see this JavaOne presentation:
http://www.slideshare.net/jboner/state-youre-doing-it-wrong-javaone-2009.