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A.D. qral

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  • Brno, Czech Republic
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@nicerobot
nicerobot / .screenrc
Created December 7, 2011 12:59
.screenrc with "tabs" using hardstatus and caption options
# look and feel
caption always "%{= bb}%{+b w}%h %=%{=b rw} %l %{= db} ${USER}@%H %{= dg}%c"
hardstatus alwayslastline "%-Lw%{= BW}%50>%n%f* %t%{-}%+Lw%<"
# skip the startup message
startup_message off
# go to home dir
chdir
@jboner
jboner / latency.txt
Last active April 29, 2025 15:40
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