#!/bin/bash

######################################################################
# customize per survey

# specify obd instances to exercise
# these can be either...
# obdfilter instances (set 'ost_names')
# ...or...
# echo_client instances (set 'client_names')
# ... use 'host:name' for obd instances on other nodes.
# allow these to be passed in via string...
# OR
# one can specify only case=disk or case=network or case=netdisk through 
# command line.

# Perquisite: For "disk" case and "netdisk" case you need to have lustre setup
#             with one or more ost's. For "network" case  you need to have all
#             modules (those llmount.sh loades) loaded in kernel. And the 
#             'lctl dl' output must be blank.

# How to run test:
# case 1 (local disk):
#   $ nobjhi=2 thrhi=2 size=1024 case=disk sh obdfilter-survey
#   one can also run test with user defined targets as follows,
#   $ nobjhi=2 thrhi=2 size=1024 targets="lustre-OST0000 lustre-OST0001 ..." sh obdfilter-survey
# case 2 (network):
#   $ nobjhi=2 thrhi=2 size=1024 targets="<name/ip_of_server>" case=network sh obdfilter-survey
#   where, targets is name or ip address of system, which you want to 
#   set as server.
# case 3 (network and disk):
#   $ nobjhi=2 thrhi=2 size=1024 case=netdisk sh obdfilter-survey
#   one can also run test with user defined targets as follows,
#   $ nobjhi=2 thrhi=2 size=1024 targets="<osc_name> ..." sh obdfilter-survey
#[ NOTE: It is advised to have automated login (passwordless entry) between server and 
#  client systems on which this test runs.]

# include library 
source libecho

# The following variables can be set in the environment, or on the
# command line
# result file prefix (date/time + hostname makes unique)
# NB ensure path to it exists
rslt_loc=${rslt_loc:-"/tmp"}
rslt=${rslt:-"$rslt_loc/obdfilter_survey_`date +%F@%R`_`uname -n`"}

# Set this true to check file contents
verify=${verify:-0}

# total size (MBytes) per obd instance
# large enough to avoid cache effects 
# and to make test startup/shutdown overhead insignificant
size=${size:-16384}

# record size (KBytes) ( 7168 max)
rszlo=${rszlo:-1024}
rszhi=${rszhi:-1024}

# number of objects per OST
nobjlo=${nobjlo:-1}
#was nobjhi=${nobjhi:-512}
nobjhi=${nobjhi:-16}

# threads per OST (1024 max)
thrlo=${thrlo:-1}
thrhi=${thrhi:-16}

# End of variables

# create a set of objects, check there are 'n' contiguous ones and
# return the first or 'ERROR'
# parameter: 1. hostname
#	     2. device number
#	     3. number of object to be created (specified by user)
#	     4. tempfile name
create_objects () {
    local host=$1
    local devno=$2
    local nobj=$3
    local rfile=$4
    remote_shell $host $lctl --device $devno create $nobj > $rfile 2>&1
    first=0
    prev=0
    count=0
    error=0
    while read line; do
        echo "$line" | grep -q 'is object id'
        if [ $?  -ne 0 ]; then
            continue
        fi
        if [ $first -eq 0 ]; then
            first=$(echo $line | awk '{print $6}')
            first=$(printf "%d" $first)
            prev=$first
            count=1
        else
            obj=$(echo $line | awk '{print $6}') 
            obj=$(printf "%d" $obj) 
            diff=$((obj - (prev+1))) 
            if [ $diff -ne 0 ]; then 
                error=1 
            fi 
            prev=$obj 
            count=$((count+1)) 
        fi 
    done < $rfile 
    if [ $nobj -ne $count ]; then 
        echo "ERROR: $nobj != $count" >&2 
        cat $rfile >&2 
        echo "ERROR" 
    elif [ $error -ne 0 ]; then 
        echo "ERROR: non contiguous objs found" >&2 
    else 
        echo $first 
    fi
}

# destroys all objects created in create_objects routine
# parameter: 3. start obj id.
destroy_objects () {
    local host=$1
    local devno=$2
    local obj0=$3
    local nobj=$4
    local rfile=$5
    remote_shell $host $lctl --device $devno destroy $obj0 $nobj > $rfile 2>&1
}

get_stats () {
    local rfile=$1
    gawk < $rfile \
	'/^Selected device [0-9]+$/ {n = 0; next}\
	/error/ {n = -1; exit}\
	/^[0-9]+\/[0-9]+ Total: [0-9]+\.[0-9]+\/second$/ {n++; v=strtonum($3); \
	                                                  if (n == 1 || v < min) min = v;\
	                                                  if (n == 1 || v > max) max = v;\
	                                                  next}\
        {if (n != 0) {n = -1; exit}}\
	END {printf "%d %f %f\n", n, min, max}'
}

get_global_stats () {
    local rfile=$1
    awk < $rfile 'BEGIN {n = 0;}\
	          {n++; if (n == 1) {err = $1; min = $2; max = $3} else\
	                            {if ($1 < err) err = $1;\
                                     if ($2 < min) min = $2;\
				     if ($3 > max) max = $3}}\
	          END {if (n == 0) err = 0;\
		       printf "%d %f %f\n", err, min, max}'
}

# enable or disable data check.
# parameter: 1. read/write
testname2type () {
    # 'x' disables data check
    if ((verify)); then
	x=""
    else
	x="x"
    fi
    case $1 in
	*write*)  echo "w$x";;
	*)        echo "r$x";;
    esac
}

print_summary () {
    if [ "$1" = "-n" ]; then
        minusn=$1; shift
    else
        minusn=""
    fi
    echo $minusn "$*" >> $rsltf
    echo $minusn "$*"
}

# Customisation variables
#####################################################################
# One can change variable values in this section as per requirements

targets=${targets:-""}
case=${case:-"disk"}
if [ -n "$targets" ]; then
    declare -a ost_names
    declare -a client_names
    count=0
    for name in $targets; do
        if [ $case == "disk" ]; then
            ost_names[$count]=$name
        else
            client_names[$count]=$name
        fi
        count=$((count+1))
    done
fi

# what tests to run (first must be write)
tests_str=${tests_str:-""}
if [ -n "$tests_str" ]; then
    declare -a tests
    count=0
    for name in $tests_str; do
        tests[$count]=$name
        count=$((count+1))
    done
else
    #tests=(write rewrite read reread rewrite_again)
    tests=(write rewrite read)
fi

# restart from here iff all are defined
restart_rsz=
restart_thr=1
restart_nobj=1

# machine's page size (K)
if [ -z "$PAGE_SIZE" ]; then
    if which python >/dev/null; then
	PAGE_SIZE=`echo 'import resource; print resource.getpagesize()/1024;' |python`
    fi
fi
PAGE_SIZE=${PAGE_SIZE:-4}

# max buffer_mem (total_threads * buffer size)
# (to avoid lctl ENOMEM problems)
max_buffer_mem=$((1024 * 1024))
snap=1
clean_srv_OSS=0
# Customisation variables ends here. 
#####################################################################
# leave the rest of this alone unless you know what you're doing...

# check and insert obdecho module
if ! lsmod | grep obdecho > /dev/null; then
    modprobe obdecho
fi
if [ ${#tests[@]} -eq 0 -o "${tests[0]}" != "write" ]; then
    echo "tests: ${tests[@]}"
    echo "First test must be 'write'" 1>&2
    exit 1
fi

rsltf="${rslt}.summary"
workf="${rslt}.detail"
cmdsf="${rslt}.script"
vmstatf="${rslt}.vmstat"
echo -n > $rsltf
echo -n > $workf

# hide a little trick to unset this from the command line
if [ "$lustre_root" == " " ]; then
    unset lustre_root
fi

if [ -z "$lustre_root" ]; then
    lctl=lctl
else
    lctl=${lustre_root}/utils/lctl
fi

# split out hostnames from client/ost names
ndevs=0
for trgt in $targets; do
    str=(`split_hostname $trgt`)
    host_names[$ndevs]=${str[0]}
    client_names[$ndevs]=${str[1]}
    ndevs=$((ndevs+1))
done
if [ $case == "disk" ]; then
        for ((i = 0; i < $ndevs; i++)); do
            ost_names[$i]=${client_names[$i]}
	done
fi
if [ $case == "netdisk" ]; then
        if [ "$targets" ]; then
            for ((i = 0; i < $ndevs; i++)); do
                setup_osc_for_remote_ost ${host_names[$i]} \
                                         ${client_names[$i]} $i
                osc_name=${client_names[$i]}_osc
                ec_using_osc $osc_name
	        cleanup_oscs="$cleanup_oscs $osc_name"
            done
        else
            client_names_str=$($lctl dl | grep -v mdt | \
                awk '{if ($2 == "UP" && $3 == "osc") {print $4} }')
            count=0;
            for name in $client_names_str; do
                client_names[$count]=`echo $name | sed 's/-osc-.*$//'`
                count=$((count+1))
            done

            host_names_str=$($lctl dl -t | grep -v mdt | \
                awk '{if ($2 == "UP" && $3 == "osc") {print $7} }')
            count=0;
            for name in $host_names_str; do
                host_names[$count]=`echo $name | sed 's/@.*$//'`
                count=$((count+1))
            done

            for (( i = 0; i < $count; i++ )) do
                setup_osc_for_remote_ost ${host_names[$i]} \
                                         ${client_names[$i]} $i
                osc_name=${client_names[$i]}_osc
                ec_using_osc $osc_name
	        cleanup_oscs="$cleanup_oscs $osc_name"
            done
        fi

        echo_clients=$($lctl dl | grep echo_client | awk "{if (\$2 == \"UP\" && \$3 == \"echo_client\") {print \$4} }")
        cnt=0;
        for name in $echo_clients; do
            client_names[$cnt]=$name
            host_names[$cnt]=localhost
            cnt=$((cnt+1))
        done
        ndevs=${#client_names[@]}
fi
if [ $case == "network" ]; then
    server_nid=$targets
    if [ -z "$server_nid" ]; then
	echo "Specify hostname or ip-address of server"
	exit 1;
    fi
    # check for obdecho module on server
    if ! dsh $server_nid root "lsmod | grep obdecho > /dev/null"; then
        dsh $server_nid root "modprobe obdecho"
    fi
    # Now do the server setup
    setup_srv_obd $server_nid "echo_srv"
    oss_on_srv=`dsh $server_nid root "$lctl dl | grep OSS" | awk '{ print $4 }'`
    if [ -z $oss_on_srv ]; then
        setup_OSS $server_nid
        clean_srv_OSS=1
    fi
    if ! dsh $server_nid root "$lctl dl | grep obdecho > /dev/null 2>&1"; then
        echo "obdecho not setup on server"
        exit 1
    fi
    if ! dsh $server_nid root "$lctl dl | grep ost > /dev/null 2>&1"; then
        echo "ost not setup on server"
        exit 1
    fi
    # Now start client setup
    osc_names_str=$($lctl dl| grep osc | grep -v mdt | grep UP)
    if [ -n "$osc_names_str" ]; then
        echo "The existing setup must be cleaned";
        exit 0;
    fi
    ec_using_srv_nid $server_nid "echotmp" "echotmp_UUID"
    client_names[0]="echotmp_ecc"
fi
if [ -z "$targets" ]; then
    if [ $case == "disk" ]; then
	get_targets
        ndevs=${#ost_names[@]}	
    fi	
fi
# get vmstat started
# disable portals debug and get obdecho loaded on all relevant hosts
unique_hosts=(`unique ${host_names[@]}`)
load_obdechos
pidcount=0
for host in ${unique_hosts[@]}; do
    host_vmstatf=${vmstatf}_${host}
    echo -n > $host_vmstatf
    remote_shell $host "vmstat 5 >> $host_vmstatf" &> /dev/null &
    pid=$!
    vmstatpids[$pidcount]=$pid
    pidcount=$((pidcount+1))
done
# get all the echo_client device numbers and names
for ((i=0; i < $ndevs; i++)); do
    host=${host_names[$i]}
    devno=(`get_ec_devno $host "${client_names[$i]}" "${ost_names[$i]}"`)
    if ((${#devno[@]} != 3)); then
        exit 1
    fi
    devnos[$i]=${devno[0]}
    client_names[$i]=${devno[1]}
    do_teardown_ec[$i]=${devno[2]}
done
if (($ndevs <= 0 || ${#host_names[@]} <= 0)); then
    echo "no devices or hosts specified"
    cleanup 0 $clean_srv_OSS $cleanup_oscs
fi
# Buffers will be spread out among all hosts, so allow for that
max_buffer_mem=$(( ${max_buffer_mem} * ${#unique_hosts[@]} ))
print_summary "$(date) Obdfilter-survey for case=$case from $(hostname)"
for ((rsz = $rszlo; rsz <= $rszhi; rsz*=2)); do
    for ((nobj = $nobjlo; nobj <= $nobjhi; nobj*=2)); do 
	for ((thr = $thrlo; thr <= $thrhi; thr*=2)); do
	    if ((thr % nobj)); then
		continue
	    fi
	    # restart?
	    if [ -n "$restart_rsz" -a\
		 -n "$restart_nobj" -a\
		 -n "$restart_thr" ]; then
		if ((rsz < restart_rsz ||\
		     (rsz == restart_rsz &&\
		      (nobj < restart_nobj ||\
		       (nobj == restart_nobj &&\
			thr < restart_thr))))); then
		    continue;
		fi
	    fi
	    # compute parameters
	    total_thr=$((ndevs*thr))
	    total_nobj=$((ndevs*nobj))
	    pages=$((rsz/PAGE_SIZE))
	    actual_rsz=$((pages*PAGE_SIZE))
	    count=$((size*1024/(actual_rsz*thr)))
	    actual_size=$((actual_rsz*count*thr))
            total_size=$((actual_size*ndevs))
	    # show computed parameters
	    str=`printf 'ost %2d sz %8dK rsz %4dK obj %4d thr %4d ' \
		     $ndevs $total_size $actual_rsz $total_nobj $total_thr`
	    echo "=======================> $str" >> $workf
	    print_summary -n "$str"
	    if ((total_thr * actual_rsz > max_buffer_mem)); then
		print_summary "Too much buffer space"
		continue
	    fi
	    # create the objects
	    tmpf="${workf}_tmp"
	    for ((idx = 0; idx < $ndevs; idx++)); do
		host=${host_names[$idx]}
		devno=${devnos[$idx]}
		client_name="${host}:${client_names[$idx]}"
		echo "=============> Create $nobj on $client_name" >> $workf
		first_obj=`create_objects $host $devno $nobj $tmpf`
		cat $tmpf >> $workf
		rm $tmpf
		if [ $first_obj = "ERROR" ]; then
		    print_summary "created object #s on $client_name not contiguous"
		    exit 1
		fi
		first_objs[$idx]=$first_obj
	    done
	    # run tests
	    for test in ${tests[@]}; do
                declare -a pidarray
                for host in ${unique_hosts[@]}; do
                    echo "starting run for test: $test rsz: $rsz threads: $thr objects: $nobj" >> ${vmstatf}_${host}
                done
		print_summary -n "$test "
		# create per-host script files
		for host in ${unique_hosts[@]}; do
		    echo -n > ${cmdsf}_${host}
		done
		for ((idx = 0; idx < $ndevs; idx++)); do
		    host=${host_names[$idx]}
		    devno=${devnos[$idx]}
		    tmpfi="${tmpf}_$idx"
		    first_obj=${first_objs[$idx]}
		    thr_per_obj=$((${thr}/${nobj}))
		    echo >> ${cmdsf}_${host} \
		        "$lctl > $tmpfi 2>&1 \\
                         --threads $thr -$snap $devno \\
			 test_brw $count `testname2type $test` q $pages ${thr_per_obj}t${first_obj} &"
                done
                pidcount=0
                for host in ${unique_hosts[@]}; do
                    echo "wait" >> ${cmdsf}_${host}
                    pidarray[$pidcount]=0
                    pidcount=$((pidcount+1))
                done
                # timed run of all the per-host script files
                t0=`date +%s.%N`
                pidcount=0
                for host in ${unique_hosts[@]}; do
                    remote_shell $host bash < ${cmdsf}_${host} &
                    pidarray[$pidcount]=$!
                    pidcount=$((pidcount+1))
                done
                pidcount=0
                for host in ${unique_hosts[@]}; do
                    wait ${pidarray[$pidcount]}
                    pidcount=$((pidcount+1))
                done
                #wait
                t1=`date +%s.%N`
                # clean up per-host script files
                for host in ${unique_hosts[@]}; do
                    rm ${cmdsf}_${host}
                done

		# compute bandwidth from total data / elapsed time
		str=`awk "BEGIN {printf \"%7.2f \",\
		         $total_size / (( $t1 - $t0 ) * 1024)}"`
		print_summary -n "$str"
		# collect/check individual OST stats
		echo -n > $tmpf
		for ((idx = 0; idx < $ndevs; idx++)); do
		    client_name="${host_names[$idx]}:${client_names[$idx]}"
		    tmpfi="${tmpf}_$idx"
		    echo "=============> $test $client_name" >> $workf
		    host="${host_names[$idx]}"
		    remote_shell $host cat $tmpfi > ${tmpfi}_local
		    cat ${tmpfi}_local >> $workf
		    get_stats ${tmpfi}_local >> $tmpf
		    rm -f $tmpfi ${tmpfi}_local
		done
		# compute/display global min/max stats
		echo "=============> $test global" >> $workf
		cat $tmpf >> $workf
		stats=(`get_global_stats $tmpf`)
		rm $tmpf
		if ((stats[0] <= 0)); then
		    if ((stats[0] < 0)); then
			str=`printf "%17s " ERROR`
		    else
			str=`printf "%17s " SHORT`
		    fi
		else
		    str=`awk "BEGIN {printf \"[%7.2f,%7.2f] \",\
			     (${stats[1]} * $actual_rsz)/1024,\
			     (${stats[2]} * $actual_rsz)/1024; exit}"`
		fi
		print_summary -n "$str"
	    done
	    print_summary ""
	    # destroy objects we created
	    for ((idx = 0; idx < $ndevs; idx++)); do
		host=${host_names[$idx]}
		devno=${devnos[$idx]}
		client_name="${host}:${client_names[$idx]}"
		first_obj=${first_objs[$idx]}
		echo "=============> Destroy $nobj on $client_name" >> $workf
		destroy_objects $host $devno $first_obj $nobj $tmpf
		cat $tmpf >> $workf
		rm $tmpf
	    done
	done
    done
done
cleanup 0 $clean_srv_OSS $cleanup_oscs
exit 0