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Simplest intro to git by github and codeschool - Try Git
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[Intro to github]
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# Seed the RottenPotatoes DB with some movies. | |
more_movies = [ | |
{:title => 'Aladdin', :rating => 'G', | |
:release_date => '25-Nov-1992'}, | |
{:title => 'When Harry Met Sally', :rating => 'R', | |
:release_date => '21-Jul-1989'}, | |
{:title => 'The Help', :rating => 'PG-13', | |
:release_date => '10-Aug-2011'}, | |
{:title => 'Raiders of the Lost Ark', :rating => 'PG', | |
:release_date => '12-Jun-1981'} |
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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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git fetch upstream | |
git reset --hard upstream/master |