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Hallucinating

Praty Sharma pratyakshs

Hallucinating
  • Stanford University
  • Stanford, CA
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@lifuzu
lifuzu / unlock_keychain.sh
Created May 11, 2016 23:59
Unlock keychain for longer time
KEYCHAIN="/Users/jenkins/Library/Keychains/login.keychain"
echo "Unlock keychain"
security unlock-keychain -p secure $KEYCHAIN
echo "Increase keychain unlock timeout"
security set-keychain-settings -lut 7200 $KEYCHAIN
echo "Add keychain to keychain-list"
security list-keychains -s $KEYCHAIN
@jboner
jboner / latency.txt
Last active July 19, 2024 09:51
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