#!/bin/bash
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# Copyright (c) 2015-2020, Intel Corporation
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#
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# [ICS VERSION STRING: unknown]

temp1="$(mktemp)"
temp2="$(mktemp)"
tmpdir=$PWD/tmp

trap "rm -f $temp1 $temp2; exit 1" SIGHUP SIGTERM SIGINT 
trap "rm -f $temp1 $temp2" EXIT

BATCH_SIZE=${BATCH_SIZE:-24}	# now many hosts per mpi job

# build the mpi_group_hosts file and start HCA-SW cable tests as a series
# of small BATCH_SIZE node jobs.  This approach limits the impact should a few hosts
# crash and also allows for quicker job startup.

# jobs are nohup'ed so they can run for long duration in the background

Usage() {
	echo "Usage: $0 [-v] [-n numprocs] [duration [minmsg [maxmsg]]]" >&2
	echo "           or" >&2
	echo "       $0 --help" >&2
	echo >&2
	echo "    -v - verbose mode.  Additional output generated to nohup files" >&2
	echo "    -n numprocs - number of processes per host (default 3)" >&2
	echo "    duration - how many minutes to run.  Can be 'infinite'.  Default is 60" >&2
	echo "    minmsg - smallest message to use.  Must be between 16384 and 4194304." >&2
	echo "    maxmsg - largest message to use.  Must be between 16384 and 4194304." >&2
  	echo "    Default minmsg and maxmsg is 4 Megabytes" >&2
	echo >&2
	echo "    This will build a set of mpi_hosts.# and mpi_group_hosts.# files with no" >&2
	echo "    more than BATCH_SIZE hosts each.  If an odd number of hosts appear in" >&2
  	echo "    mpi_hosts, the last one is skipped" >&2
	echo "    Each run_cabletest MPI job will have its output saved to a corresponding" >&2
	echo "    ./tmp/nohup.#.out file" >&2
	echo "Environment:" >&2
	echo "    MPI_HOSTS - mpi_hosts file to use, default is mpi_hosts" >&2
	echo "                This should list hosts in topology order, 1 entry per host" >&2
	echo "                hosts will be paired sequentially (1st & 2nd, 3rd & 4th, ...)" >&2 
	echo "    BATCH_SIZE - maximum hosts per MPI job, default is 18, must be even" >&2
	echo "Examples:" >&2
	echo "    $0" >&2
	echo "    MPI_HOSTS=good $0 1440" >&2
	echo "    BATCH_SIZE=16 MPI_HOSTS=good $0 infinite" >&2
	exit 2
}

if [ x"$1" = x"-h" -o x"$1" = x"--help" ]
then
	Usage
fi
numprocs=
vopt=
while getopts vn: param
do
	case $param in
	v)	vopt="-v";;
	n)	numprocs="$OPTARG";;
	*)	Usage;;
	esac
done
shift $((OPTIND-1))

export MPI_HOSTS=${MPI_HOSTS:-mpi_hosts}
if [ ! -e $MPI_HOSTS ]
then
	echo "MPI_HOSTS='$MPI_HOSTS': Not Found" >&2
	Usage
fi

if ! [ $BATCH_SIZE -gt 0 ] 2>/dev/null
then
	echo "Invalid BATCH_SIZE='$BATCH_SIZE': must be an even number >= 2" >&2
	Usage
fi
if [ $(($BATCH_SIZE % 2)) -eq 1 ]
then
	echo "Invalid BATCH_SIZE='$BATCH_SIZE': must be an even number" >&2
	Usage
fi

# ignore blank and comment lines in mpi_hosts
cat $MPI_HOSTS|grep -E -v '^[[:space:]]*#'|grep -E -v '^[[:space:]]*$' > $temp1
echo "Starting NIC-SW cabletests using $MPI_HOSTS: $(cat $temp1|wc -l) hosts"
echo "  Max batch size $BATCH_SIZE"

#set -x
mkdir -p $tmpdir
loop=1
while [ $(cat $temp1|wc -l) -gt 1 ]
do
	head -$BATCH_SIZE $temp1 > $tmpdir/mpi_hosts.$loop
	if [ $(($(cat $tmpdir/mpi_hosts.$loop|wc -l) % 2)) -eq 1 ]
	then
		# need an even number, drop the last one
		echo "Skipping odd host:" `tail -1 $temp1`
		head -$(($(cat $temp1|wc -l) - 1)) $temp1 > $tmpdir/mpi_hosts.$loop
	fi
	tail -n +$(($BATCH_SIZE + 1)) $temp1 > $temp2; mv $temp2 $temp1
	echo "starting cabletest $loop on $(cat $tmpdir/mpi_hosts.$loop|wc -l) hosts"
	export MPI_HOSTS=$tmpdir/mpi_hosts.$loop
	export MPI_GROUP_HOSTS=$tmpdir/mpi_group_hosts.$loop
	export LOGSUFFIX=".$loop"
	./gen_group_hosts > /dev/null <<EOF


$numprocs
EOF
	nohup ./run_cabletest $vopt "$@" > $tmpdir/nohup.$loop.out 2>&1 &
	loop=$(($loop + 1))
	#echo "Enter to Continue"
	#read trash
done

if [ $(cat $temp1|wc -l) -gt 0 ]
then
	echo "Skipping odd host:" `cat $temp1`
fi
rm -f $temp1 $temp2

echo "Started $(($loop - 1 )) MPI cabletest jobs"
