comerford

./mongod --storageEngine=rocksdb
2015-04-03T19:09:38.983+0100 I STORAGE  Compression: snappy
2015-04-03T19:09:38.983+0100 I STORAGE  MaxWriteMBPerSec: 1024
2015-04-03T19:09:39.042+0100 I CONTROL  [initandlisten] MongoDB starting : pid=16433 port=27017 dbpath=/data/db 64-bit host=fed-vm
2015-04-03T19:09:39.042+0100 I CONTROL  [initandlisten] 
2015-04-03T19:09:39.042+0100 I CONTROL  [initandlisten] ** NOTE: This is a development version (3.1.1-pre-) of MongoDB.
2015-04-03T19:09:39.042+0100 I CONTROL  [initandlisten] **       Not recommended for production.
2015-04-03T19:09:39.042+0100 I CONTROL  [initandlisten] 
2015-04-03T19:09:39.043+0100 I CONTROL  [initandlisten] 
2015-04-03T19:09:39.043+0100 I CONTROL  [initandlisten] ** WARNING: /sys/kernel/mm/transparent_hugepage/defrag is 'always'.

comerford

storage:
    dbPath: "/data/db/300-mm"
    directoryPerDB: true
    journal:
        enabled: true
systemLog:
    destination: file
    path: "/data/db/300-mm/mongodb.log"
    logAppend: true
    timeStampFormat: iso8601-utc

comerford

// start a mongo shell to act as a JS interpreter (no db connection required)
mongo --nodb
// store sample id in a variable
var id = new ObjectId("533bc0f60015a0a814000001");
// print out the variable
> id
ObjectId("533bc0f60015a0a814000001")
// try some methods
id.getTimestamp()
ISODate("2014-04-02T07:49:10Z")

comerford

// the start/end is not really needed since explain contains timing information
// but, this is useful for comparison with other commands (touch) which do not have such info
var start = new Date().getTime();
db.data.find().explain("executionStats")
var end = new Date().getTime();
print("Time to touch data: " + (end - start) + "ms");

comerford

storage:
    dbPath: "/ssd/db/mmap"
    engine: "mmapv1"
systemLog:
    destination: file
    path: "/data/mmap/mongodb.log"
processManagement:
    fork: true

comerford

storage:
    dbPath: "/ssd/db/wt_none"
    engine: "wiredTiger"
    wiredTiger:
        collectionConfig: "block_compressor="
systemLog:
    destination: file
    path: "/data/wt_none/mongodb.log"
processManagement:
    fork: true

comerford

storage:
    dbPath: "/ssd/db/wt_zlib"
    engine: "wiredTiger"
    wiredTiger:
        collectionConfig: "block_compressor=zlib"
systemLog:
    destination: file
    path: "/data/wt_zlib/mongodb.log"
processManagement:
    fork: true

comerford

storage:
    dbPath: "/ssd/db/wt_snappy"
    engine: "wiredTiger"
systemLog:
    destination: file
    path: "/data/wt_snappy/mongodb.log"
processManagement:
    fork: true

comerford

// these docs, in 2.6, get bucketed into the 256 bucket (size without header = 240)
// From Object.bsonsize(db.data.findOne()), the size is actually 198 for reference, so add 16 to that for an exact fit
// with that doc size, 80,000 is a nice round number under the 16MiB limit, so will use that for the inner loop
 
// We are shooting for ~16 GiB of data, without indexes, so do 1,024 iterations (512 from each client)
// This will mean being a little short (~500MiB) in terms of target data size, but keeps things simple
 
for(var j = 0; j < 512; j++){ //
  bigDoc = [];
  for(var i = 0; i < 80000; i++){

comerford

#!/bin/bash
#
# author: Tim "xGhOsTkiLLeRx" Brust
# license: CC BY-NC-SA 4.0
# version: 0.2
# date: 07/10/2014
# description: replace (root) password of squashfs from openELEC
# usage: ./openELEC [password] [device] [hash] [user]
# dependencies: mkpassword (whois), squashfs-tools
#