#!/bin/bash
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# Copyright (c) 2015, Intel Corporation
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#[ICS VERSION STRING: unknown]

MPI_HOSTS=${MPI_HOSTS:-$PWD/mpi_hosts}
MPI_GROUP_HOSTS=${MPI_GROUP_HOSTS:-$PWD/mpi_group_hosts}
DEFAULT_GROUPSIZE=2
DEFAULT_NUMPROCS=3

hostfile="/baddir/badfile"

groupsize="NaN"
numprocs="NaN"

echo
echo "This tool generates an mpi_group_test file for use with"
echo "run_cabletest."
echo
echo "To generate an mpi_group_test file, please answer the"
echo "following questions."

until [ -f $hostfile ]
do
	echo
	echo "Please enter the name of your hosts file."
	echo "The hosts must be listed in group order, one per line. "
	echo "Hosts should not be listed more than once and should be listed"
	echo "in their physical order."
	echo -n "Hostfile (default is $MPI_HOSTS)> "
	read hostfile
	
	if [ -z "$hostfile" ] 
	then
		hostfile=$MPI_HOSTS
	fi

	if [ ! -f $hostfile ]
	then
		echo "Could not find '$hostfile'".
	fi
done

until [ $groupsize -eq $groupsize 2>/dev/null ]
do
	echo 
	echo "How big are your groups? For example, if you want to test each"
	echo "node against the node next to it, use a group size of 2."
	echo "(This is the default.)"
	echo "If you want to test the nodes connected to one leaf switch against "
	echo "nodes on another leaf switch, and you have 16 nodes per leaf,"
	echo "your group size is 32."
	echo "Remember, your hosts must be listed in the order they are connected"
	echo "to the switches."
	echo -n "Group Size (default is $DEFAULT_GROUPSIZE)> "
	read groupsize

	if [ -z "$groupsize" ] 
	then
		groupsize=$DEFAULT_GROUPSIZE
	fi

	# Believe it or not, this is how you check to see
	# if $groupsize is numeric or not....
	if [ $groupsize -eq $groupsize 2>/dev/null ]
	then
		if [ $groupsize -le 1 ]
		then 
			echo "Group Size must be at least two."
			groupsize="NaN"
		fi
	else
		echo "Group Size must be a number."
	fi
done

until [ $numprocs -eq $numprocs 2>/dev/null ]
do
	echo 
	echo "How many processes per node do you wish to run?"
	echo "The higher you make this number, the higher your"
	echo "link utilization will be. The number should be between"
	echo "1 and the number of processors per node."
	echo -n "Number of processes (default is $DEFAULT_NUMPROCS)> "
	read numprocs

	if [ -z "$numprocs" ] 
	then
		numprocs=$DEFAULT_NUMPROCS
	fi
	
	# Believe it or not, this is how you check to see
	# if $numprocs is numeric or not....
	if [ $numprocs -eq $numprocs 2>/dev/null ]
	then
		if [ $numprocs -le 0 ]
		then 
			echo "Number of processes must be at least one."
			numprocs="NaN"
		fi
	else
		echo "Number of processes must be a number."
	fi
done

# this assignment will implicitly ignore blank lines
host=( `cat $hostfile | grep -v "^#"` )
hostcount=${#host[*]}

i=0
j=$groupsize
groupno=0

echo "# DO NOT DELETE THIS LINE: $groupsize $numprocs" >$MPI_GROUP_HOSTS

while [ $i -lt $hostcount ]
do
	if [ $j -eq $groupsize ]
	then 
		groupno=$((groupno + 1))
		(echo "#"
		echo "# Group $groupno"
		echo "#") >> $MPI_GROUP_HOSTS
		j=1
	else
		j=$((j + 1))
	fi

	echo ${host[$i]} >> $MPI_GROUP_HOSTS
	i=$((i + 1))
done

echo
echo "$MPI_GROUP_HOSTS generated."
if [ $j -ne $groupsize ] 
then
	echo 
	echo "WARNING: The number of hosts in $hostfile is not"
	echo "an even multiple of the group size $groupsize."
	echo "It is highly likely that the new mpi_group_hosts"
	echo "file is not correct."
fi
echo
