studzien

This post shows an example of a BEAM process' core dump analysis to backtrack what was the root cause of its crash.

Start gdb by pointing out the BEAM executable that generated the core dump and the core dump file. Optionally, you can provide a directory with the VM's source code:

gdb erts-6.3/bin/beam.smp -core core.14747 -d /home/azureuser/otp_src_17.4/erts/emulator

gdb should tell you what caused the crash and where in code this happened:

daschl

Properties systemProperties = System.getProperties();
systemProperties.put("net.spy.log.LoggerImpl", "net.spy.memcached.compat.log.SunLogger");
System.setProperties(systemProperties);
 
Logger logger = Logger.getLogger("com.couchbase.client");
logger.setLevel(Level.FINEST);
for(Handler h : logger.getParent().getHandlers()) {
    if(h instanceof ConsoleHandler){
        h.setLevel(Level.FINEST);
    }

avsej

require_gcc
export CFLAGS='-Wall -Wextra -O0 -ggdb3'
export CPPFLAGS=$CFLAGS
install_package "readline-6.2" "http://ftpmirror.gnu.org/readline/readline-6.2.tar.gz#67948acb2ca081f23359d0256e9a271c" standard --if has_broken_mac_readline
export CONFIGURE_OPTS='--with-pydebug'
install_package "Python-2.7.5" "http://www.python.org/ftp/python/2.7.5/Python-2.7.5.tgz#b4f01a1d0ba0b46b05c73b2ac909b1df" standard verify_py27
unset CONFIGURE_OPTS
install_package "setuptools-1.1" "https://pypi.python.org/packages/source/s/setuptools/setuptools-1.1.tar.gz#84062633c3818c912af76d54a40d11a7" python
install_package "pip-1.4.1" "https://pypi.python.org/packages/source/p/pip/pip-1.4.1.tar.gz#6afbb46aeb48abac658d4df742bff714" python

somebody32

Введение

Начать стоит отсюда. Не пугайтесь то, что это книга по незнакомой OS, эти термины практически везде одинаковые и здесь они изложены в понятной для начинающих форме.

http://www.qnx.com/developers/docs/6.4.1/neutrino/getting_started/s1_procs.html

Прочесть нужно треть главы до подраздела "Starting a process", если С не пугает, читайте полностью. После прочтения вы будете понимать, что такое process, thread, mutex, priorites, semaphores, scheduler, contex-switch, kernel states.

Ruby

avsej

#!/usr/bin/env ruby

require 'fileutils'
include FileUtils

version = "2.0.4"
distributions = [
  {:type => :deb, :ver => "10.04", :arch => ["i386", "amd64"], :channel => "lucid"},
  {:type => :deb, :ver => "11.10", :arch => ["i386", "amd64"], :channel => "oneiric"},
  {:type => :deb, :ver => "12.04", :arch => ["i386", "amd64"], :channel => "precise"},

ingenthr

set -xe
server=192.168.1.200
curl --data "ns_config:set({node, node(),{timeout, ns_memcached_outer}},300000)." -u Administrator:password http://$server:8091/diag/eval
curl --data "ns_config:set({node, node(),{timeout, memcached_recv}},300000)." -u Administrator:password http://$server:8091/diag/eval
curl --data "ns_config:set({node, node(),{timeout, memcached_stats_recv}},300000)." -u Administrator:password http://$server:8091/diag/eval
curl --data "ns_config:set({node, node(),{timeout, ns_memcached_outer_heavy}},300000)." -u Administrator:password http://$server:8091/diag/eval
curl --data "ns_config:set({node, node(),{timeout, ns_memcached_outer_very_heavy}},600000)." -u Administrator:password http://$server:8091/diag/eval
curl --data "ns_config:set({node, node(),{timeout, ebucketmigrator_connect}},1200000)." -u Administrator:password http://$server:8091/diag/eval

avsej

/* -*- Mode: C; tab-width: 4; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* GistID: 4621066
 */
/*
 *     Copyright 2013 Couchbase, Inc.
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *

avsej

    LOCALTIME=$(date +%Y-%m-%dT%H:%M)
    AMERICA=$(TZ=America/Los_Angeles date +%H:%M%Z)
    CET=$(TZ=Europe/Oslo date +%H:%M%Z)
    ART=$(TZ=America/Buenos_Aires date +%H:%M%Z)

    xsetroot -name "$WIFI $LOCALTIME $AMERICA $CET $ART"

avsej

digraph libcouchbase {
    "libcouchbase2-all"         -> "libcouchbase-bin"       [label = "provided by"];
    "libcouchbase2"             -> "libcouchbase2-core"     [label = "depends on"];
    "libcouchbase2"             -> "libcouchbase2-backend"  [label = "depends on"];
    "libcouchbase2-backend"     -> "libcouchbase2-libevent" [label = "provided by"];
    "libcouchbase2-backend"     -> "libcouchbase2-libev"    [label = "provided by"];
    "libcouchbase-bin"          -> "libcouchbase2"          [label = "depends on"];
    "libcouchbase-dbg"          -> "libcouchbase2-core"     [label = "depends on"];
    "libcouchbase-dev"          -> "libcouchbase2-core"     [label = "depends on"];
    "libcouchbase-libev-dev"    -> "libcouchbase2-libev"    [label = "depends on"];

0x000000

=== Часть 1. Обзорная информация

== Обязательно посмотрите
http://en.wikipedia.org/wiki/Internet_media_type 
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes или http://www.flickr.com/photos/girliemac/sets/72157628409467125

http://api.rubyonrails.org/classes/ActionDispatch/Response.html
http://api.rubyonrails.org/classes/ActionDispatch/Request.html

== Документация по AJAX в jQuery