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

beddari

#!/bin/bash
# Script for placing sudoers.d files with syntax-checking

if [ -z "$1" ]; then
  # Making a temporary file to contain the sudoers-changes to be pre-checked
  TMP=$(mktemp)
  cat > $TMP <<EOF
Cmnd_Alias VAGRANT_EXPORTS_ADD = /bin/su root -c echo '*' >> /etc/exports
Cmnd_Alias VAGRANT_NFSD = /etc/init.d/nfs-kernel-server restart
Cmnd_Alias VAGRANT_EXPORTS_REMOVE = /bin/sed -e /*/ d -ibak /etc/exports