phadej

{-# 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

edsko

{-# OPTIONS_GHC -Wall -fno-warn-unused-binds #-}
{-# LANGUAGE CPP                 #-}
{-# LANGUAGE FlexibleContexts    #-}
{-# LANGUAGE IncoherentInstances #-}
{-# LANGUAGE RankNTypes          #-}
{-# LANGUAGE ScopedTypeVariables #-}

#if __GLASGOW_HASKELL__ >= 708
{-# LANGUAGE RoleAnnotations     #-}
#endif

jboner

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