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Monitoring

• rabbitmqctl status - generic node info
• rabbitmqctl cluster_status - checks connectivity with other nodes and alarms

Troubleshoot

Consumer prefetch

By default Rabbit will prefetch several messages to boost performance. If the consumption

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Index

• strace - log system calls made by a process
• ngrep - log every request/response on a port

Reference

• https://www.youtube.com/watch?v=HfD9IMZ9rKY&list=WL&index=14

strace

Runs a program and shows every system calls made (open files, network, etc).

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obb-rules[obb-spec]$ OBB_SCENARIOS_TO_TEST=0 lein with-profile clj run

Testing obb-rules.board-test

Testing obb-rules.actions.go-to-test

Testing obb-rules.actions.strikeback-test

Testing obb-rules.actions.damage-calculator-test

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vmstat <ms>

Shows virtual memory stats every ms millis.

jps -lvm

Shows the java processes running, their PID, and command line arguments.

jcmd <pid> help

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JVM: “Elapsed time: 22s”
Jodejs: “Elapsed time: 104s”
Phantomjs “Elapsed time: 155s”

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(ns obb-rules.evaluator-test
  (:require
    #?(:cljs [cljs.test.check :as tc])
    #?(:clj [clojure.test.check.generators :as gen]
       :cljs [cljs.test.check.generators :as gen])
    #?(:clj [clojure.test.check.properties :as prop]
       :cljs [cljs.test.check.properties :as prop :include-macros true])
    #?(:clj [clojure.test.check.clojure-test :refer [defspec]]
       :cljs [cljs.test.check.cljs-test :refer-macros [defspec]])
    #?(:clj [clojure.test :refer [deftest testing is run-tests]]

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(ns obb-rules.action-test
  (:require
    #?(:clj [clojure.test :refer [deftest testing is run-tests]]
       :cljs [cljs.test :refer-macros [deftest testing is run-tests]])))

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lein with-profile clj run
lein with-profile cljs-node cljsbuild test
lein with-profile cljs-browser cljsbuild test

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-------------------------------------------------------------------------------
Language                     files          blank        comment           code
-------------------------------------------------------------------------------
Clojure Common                  84            682              6           4425
Clojure                          1              3              0             13
ClojureScript                    1              5              0             10
-------------------------------------------------------------------------------
SUM:                            86            690              6           4448
-------------------------------------------------------------------------------

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(defn save!
  "Persists an account"
  [account]
  (-> (common/db)
      (mc/save-and-return "accounts" account)))

(defn find-by-id
  "Find account by given query"
  [id]
  (-> (common/db)