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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 |
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final SMTPServer server = new SMTPServer(new SimpleMessageListenerAdapter(new SimpleMessageListener() | |
{ | |
@Override | |
public void deliver(final String from, final String recipient, final InputStream data) throws TooMuchDataException, IOException | |
{ | |
System.err.println(from + " -> " + recipient); | |
} | |
@Override | |
public boolean accept(final String from, final String recipient) |
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" Vim color file | |
" Converted from Textmate theme Twilight using Coloration v0.2.5 (http://github.com/sickill/coloration) | |
set background=dark | |
highlight clear | |
if exists("syntax_on") | |
syntax reset | |
endif |
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require 'fileutils' | |
start_time = Time.now | |
SOURCE_DB = { | |
:name => 'db_name', | |
:user => 'db_user', | |
:password => 'db_pass', | |
:host => 'localhost' |
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# with multiple collections + commands for renaming back the collections | |
require 'mongo' | |
# Stop writing to your database. | |
# Then, for each collection: | |
# Specify the DB and COLLECTION you want to convert. | |
# Will insert all modified documents into a new collection | |
# called 'new_' + old_collection_name. | |
# Then you can delete the old collection and rename the new one |