diskbench.sh

#!/bin/bash

usage(){
echo "
Written by Brian Bushnell
Last modified March 5, 2018

Description:  Benchmarks a disk with multithreaded I/O.

Usage:  diskbench.sh path=<path> data=<8g> passes=<2> threads=<>

Parameters:
path=           Location to read and write.
data=8g         Number of bytes to process per pass.
threads=        Number of threads to use.  By default, all logical threads.
                In RW mode the number of active threads is doubled.
mode=rw         I/O mode:
                   r:  Test read speed only.
                   w:  Test write speed only.
                   rw: Test read and write speed simultaneously.

Processing parameters:
None yet!

Java Parameters:
-Xmx            This will set Java's memory usage, overriding autodetection.
                -Xmx20g will specify 20 gigs of RAM, and -Xmx200m will
                specify 200 megs. The max is typically 85% of physical memory.
-eoom           This flag will cause the process to exit if an out-of-memory
                exception occurs.  Requires Java 8u92+.
-da             Disable assertions.

Please contact Brian Bushnell at bbushnell@lbl.gov if you encounter any problems.
For documentation and the latest version, visit: https://bbmap.org
"
}

if [ -z "$1" ] || [ "$1" = "-h" ] || [ "$1" = "--help" ]; then
	usage
	exit
fi

resolveSymlinks(){
	SCRIPT="$(cd "$(dirname "$0")" && pwd)/$(basename "$0")"
	while [ -h "$SCRIPT" ]; do
		DIR="$(dirname "$SCRIPT")"
		SCRIPT="$(readlink "$SCRIPT")"
		[ "${SCRIPT#/}" = "$SCRIPT" ] && SCRIPT="$DIR/$SCRIPT"
	done
	DIR="$(cd "$(dirname "$SCRIPT")" && pwd)"
	if [ -f "$DIR/bbtools.jar" ]; then
		CP="$DIR/bbtools.jar"
	else
		CP="$DIR/current/"
	fi
}

setEnv(){
	. "$DIR/javasetup.sh"
	. "$DIR/memdetect.sh"

	parseJavaArgs "--xmx=400m" "--xms=400m" "--mode=fixed" "$@"
	setEnvironment
}

launch() {
	CMD="java $EA $EOOM $SIMD $XMX $XMS -cp $CP fun.DiskBench $@"
	echo "$CMD" >&2
	eval $CMD
}

resolveSymlinks
setEnv "$@"
launch "$@"