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@jboner
jboner / latency.txt
Last active May 24, 2024 12:40
Latency Numbers Every Programmer Should Know
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
Our yachts are toy boats, the glint on a lovely brief bubble of time. A boat's importance as an escape from reality, as a change of pace, as a theme for reflection and as an art form gives it worth or value.
--William Garden
@peterneubauer
peterneubauer / gist:2652082
Created May 10, 2012 09:19
Basic Graphviz
Transaction tx = neo.beginTx();
try
{
final Node emil = neo.createNode();
emil.setProperty( "name", "Emil Eifrém" );
emil.setProperty( "age", 30 );
final Node tobias = neo.createNode();
tobias.setProperty( "name", "Tobias \"thobe\" Ivarsson" );
tobias.setProperty( "age", 23 );
tobias.setProperty( "hours", new int[] { 10, 10, 4, 4, 0 } );