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{-# LANGUAGE CPP #-} | |
{-# LANGUAGE ScopedTypeVariables #-} | |
{-# LANGUAGE FlexibleInstances, FlexibleContexts #-} | |
{-# LANGUAGE DataKinds, GADTs, KindSignatures, TypeOperators, UndecidableInstances #-} | |
#if __GLASGOW_HASKELL__ < 708 | |
#error "requires GHC 7.10 or newer" | |
#endif | |
module Main (main) where |
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{-# OPTIONS_GHC -Wall -fno-warn-unused-binds #-} | |
{-# LANGUAGE CPP #-} | |
{-# LANGUAGE FlexibleContexts #-} | |
{-# LANGUAGE IncoherentInstances #-} | |
{-# LANGUAGE RankNTypes #-} | |
{-# LANGUAGE ScopedTypeVariables #-} | |
#if __GLASGOW_HASKELL__ >= 708 | |
{-# LANGUAGE RoleAnnotations #-} | |
#endif |
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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 |