jj1bdx

#!/bin/sh
# Originally from:
# https://github.com/blankpage/e5UNIXBuilder/blob/master/build-akili.sh

# Linux and similar...
CPUS=`getconf _NPROCESSORS_ONLN 2>/dev/null`
# FreeBSD and similar...
[ -z "$CPUS" ] && CPUS=`getconf NPROCESSORS_ONLN`
# Solaris and similar...
[ -z "$CPUS" ] && CPUS=`ksh93 -c 'getconf NPROCESSORS_ONLN'`

rtomayko

#!/bin/sh
# Usage: . testlib.sh
# Simple shell command language test library.
#
# Tests must follow the basic form:
#
#   begin_test "the thing"
#   (
#        set -e
#        echo "hello"

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