jeroenvandijk / datomic_in_memory_excision_test.clj

Last active November 11, 2021 02:36

Tests the memory usage of in-memory Datomic db when excising data

	(require '[datomic.api :as d])

	(def db-uri "datomic:mem://hello")
	(d/create-database db-uri)
	(def conn (atom {}))

	(reset! conn (d/connect db-uri))

	(def schema [{:db/id (d/tempid :db.part/db)
	:db/ident :dummy/content

jeroenvandijk / sat.clj

Last active August 29, 2015 14:14 — forked from jmgimeno/sat.clj

	;Code from http://peteriserins.com/2011/12/23/sat-in-clojure-core-logic.html

	;; lein try org.clojure/core.logic "0.8.8"

	(require '[clojure.core.logic :refer [conde run* fresh ] :as l])

	(declare goalify)

	(defn and-rewrite [expr]
	`(conde

jeroenvandijk / failing_mapfn.clj

Created October 21, 2014 12:51

Examples of where mapfn fails

	;; All these cases below give the following exception:
	;; ...
	;; Caused by: java.lang.RuntimeException: Unable to resolve symbol: l in this context

	(use 'cascalog.api)

	;; clojure.lang.APersistentMap$KeySeq
	(let [l (keys {:a 1})]
	(?<- (stdout) [?a]
	([[1]] ?b)

jeroenvandijk / accounts.clj

Created April 8, 2014 16:18 — forked from pelle/accounts.clj

	(use '[datomic.api :only [q db] :as d])

	(def uri "datomic:mem://accounts")

	;; create database
	(d/create-database uri)

	;; connect to database
	(def conn (d/connect uri))

jeroenvandijk / docker_cheat.md

Last active August 29, 2015 13:58 — forked from wsargent/docker_cheat.md

Docker Cheat Sheet

Why

Why Should I Care (For Developers)

"Docker interests me because it allows simple environment isolation and repeatability. I can create a run-time environment once, package it up, then run it again on any other machine. Furthermore, everything that runs in that environment is isolated from the underlying host (much like a virtual machine). And best of all, everything is fast and simple."

TL;DR, I just want a dev environment

jeroenvandijk / sky_query.clj

Created February 12, 2014 08:50

Example of a query in a Clojure Skydb clone

	; On the dataset from 2012-04-11-15 of http://www.githubarchive.org/
	; how many people create a repo after pushing
	(run-query database
	(when-action
	"PushEvent"
	(within-step 1
	(when-action
	"CreateEvent"
	(within-step 1
	(select-count))))))

jeroenvandijk / system_usage.clj

Created December 20, 2013 09:46

	;; Ported from Java example in http://stackoverflow.com/questions/47177/how-to-monitor-the-computers-cpu-memory-and-disk-usage-in-java#47199
	;; Apparantly, when there is more than 4GB or Ram and on Java 32-bit there is a bug with memory size, see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6853676

	(import '[java.lang.management ManagementFactory]
	'[java.lang.management OperatingSystemMXBean]
	'[java.lang.reflect Method]
	'[java.lang.reflect Modifier])

	(defn print-usage []
	(let [operatingSystemMXBean (ManagementFactory/getOperatingSystemMXBean)

jeroenvandijk / hyperloglog.clj

Last active December 28, 2015 14:29

Alternative Hyperloglog implementation for Cascalog

	;; Possibly more performant version due the absence of multimethods of http://screen6.github.io/blog/2013/11/13/hyperloglog-with-cascalog.html
	;; Needs to be tested
	(defprotocol IHyperLogLogMerge
	(hyperloglog-val [this])
	(merge [this other])
	(merge-with-hyperloglog [this other-hll]))

	(extend-protocol IHyperLogLogMerge
	nil
	(hyperloglog-val [this] nil)

jeroenvandijk / core.clj

Created September 20, 2013 11:07

Simple example to show warnings cause by prismatic/schema

	;; Generated by lein new schema-test
	(ns schema-test.core
	(:require [schema.core :as s])
	(:gen-class))

	(defn -main [& args]
	(println "hi")
	)

jeroenvandijk / sink_function.clj

Created July 3, 2013 07:32

sink functions and cascalog-tap usage (see https://groups.google.com/forum/#!topic/cascalog-user/H4o74RPcnis)

	;; Example sink function by Nathan https://groups.google.com/forum/#!msg/cascalog-user/d5STyIkO9yA/ynUKwj6HLdEJ
	(defn count-stdout [sq]
	[(stdout)
	(<- [?count]
	(sq :>> (get-out-fields sq))
	(c/count ?count))] )

	(?<- count-stdout
	[?person ?age ?gender]
	(age ?person ?age)

Jeroen van Dijk jeroenvandijk

Docker Cheat Sheet

Why

TL;DR, I just want a dev environment