#!/bin/bash

## Usage ################################
# ./bigdl-nano-init <command to run under openmp and jemalloc environment variables>
# Example:
# bigdl-nano-init python pytorch-lenet.py --device ipex
#########################################


# Get options
function disable-openmp-var {
    echo "Option: Disable opemMP and unset related variables"
    export DISABLE_OPENMP_VAR=1
}

function enable-jemalloc-var {
    echo "Option: Enable jemalloc and set related variables"
    export ENABLE_JEMALLOC_VAR=1
}

function disable-tcmalloc-var {
    echo "Option: Disable tcmalloc and unset related variables"
    export DISABLE_TCMALLOC_VAR=1
}

function enable-perf-var {
    echo "Option: Enable perf mode"
    PERF_VAR=1
}

function display-error {
    echo "Invalid Option: -$1" 1>&2
    echo ""
    display-help
}

function display-help {
    echo "Usage: bigdl-nano-run [-o] [-j] <subcommand>"
        echo ""
        echo "bigdl-nano-run is a tool to automatically configure and run the subcommand under"
        echo "environment variables for accelerating pytorch."
        echo ""
        echo "Optional options:"
        echo "    -h, --help                Display this help message and exit."
        echo "    -o, --disable-openmp      Disable openMP and unset related variables"
        echo "    -j, --enable-jemalloc     Enable jemalloc and unset related variables"
        echo "    -c, --disable-tcmalloc    Disable tcmalloc and unset related variables"
        echo "    -p, --perf                Use performance mode"
}

# Init
OPENMP=0
JEMALLOC=1
TCMALLOC=1
# Set TF_ENABLE_ONEDNN_OPTS
export TF_ENABLE_ONEDNN_OPTS=1

OPTIND=1

while getopts ":ojhcp-:" opt; do
    case ${opt} in
        - )
            case "${OPTARG}" in
                disable-openmp)
                    disable-openmp-var
                    ;;
                enable-jemalloc)
                    disable-tcmalloc-var
                    enable-jemalloc-var
                    ;;
                disable-tcmalloc)
                    disable-tcmalloc-var
                    ;;
                perf)
                        enable-perf-var
                    ;;
                help)
                    display-help
                    return 0
                    ;;
                *)
                    display-error $OPTARG
                    return 1
                    ;;
            esac
            ;;

        o )
            disable-openmp-var
            ;;
        j )
            disable-tcmalloc-var
            enable-jemalloc-var
            ;;
        c )
            disable-tcmalloc-var
            ;;
        p )
            enable-perf-var
            ;;
        h )
            display-help
            return 0
            ;;	
        \? )
            display-error $OPTARG
            return 1
            ;;
    esac
done

shift $((OPTIND -1))

# Find conda dir
if [ ! -z $BASH_SOURCE ]; then
    # using bash
    BASE_DIR="$(dirname $BASH_SOURCE)/.."
else
    # using zsh
    BASE_DIR="$(dirname ${(%):-%N})/.."
fi
echo "conda dir found: $BASE_DIR"
LIB_DIR=$BASE_DIR/lib

PYTHON_VERSION=$(python3 -c "import platform; major, mnior, patch = platform.python_version_tuple();print(major+'.'+mnior)")

NANO_DIR="$(dirname "$(python3 -c "import bigdl; print(bigdl.__file__)")")/nano/"


# Detect Intel openMP library
if [ -f "${LIB_DIR}/libiomp5.so" ]; then
    echo "OpenMP library found..."
    OPENMP=1

    # detect number of physical cores
    cpu_infos=($(lscpu -p=CPU,Socket,Core | grep -P '^(\d*),(\d*),(\d*)$'))
    max_cpu_info=($(echo ${cpu_infos[-1]} | sed 's/,/\ /g'))
    # bash's array index starts from 0, while zsh's array index starts from 1,
    # so we use -1, -2, -3 as index here for consistency
    let cpu_=${max_cpu_info[-3]}+1
    let sockets_=${max_cpu_info[-2]}+1
    let core_=${max_cpu_info[-1]}+1
    let threads_per_core=$cpu_/$core_
    let cores_per_socket=$core_/$sockets_


    # set env variables
    echo "Setting OMP_NUM_THREADS..."
    export OMP_NUM_THREADS=$core_

    echo "Setting KMP_AFFINITY..."
    export KMP_AFFINITY=granularity=fine,none

        if [[ "${PERF_VAR}" == "1" ]]; then
            # experiment variable to speed up performance.
            export OPENMP=0
            export KMP_AFFINITY=granularity=fine,compact,1,0
        fi

    echo "Setting KMP_BLOCKTIME..."
    export KMP_BLOCKTIME=1

else
    echo "No openMP library found in ${LIB_DIR}."
fi

# set env variables
echo "Setting MALLOC_CONF..."
export MALLOC_CONF="oversize_threshold:1,background_thread:false,metadata_thp:always,dirty_decay_ms:-1,muzzy_decay_ms:-1"

# Set LD_PRELOAD
echo "Setting LD_PRELOAD..."
if [[ $OPENMP -eq 1 && -z "${DISABLE_OPENMP_VAR:-}" ]]; then
    export LD_PRELOAD="${LIB_DIR}/libiomp5.so"
fi

# Set JEMALLOC lib path
if [[ $JEMALLOC -eq 1 && ! -z "${ENABLE_JEMALLOC_VAR:-}" ]]; then
    DISABLE_TCMALLOC_VAR=1
    if [ -f "${NANO_DIR}/libs/libjemalloc.so" ]; then
        JEMALLOC_PATH="${NANO_DIR}/libs/libjemalloc.so"
    elif [ -f "${LIB_DIR}/libjemalloc.so" ]; then
        JEMALLOC_PATH="${LIB_DIR}/libjemalloc.so"
    fi
    # if `LD_PRELOAD` or `JEMLLOC_PATH` is empty, there will be
    # extra space on the left or right sides, use echo to remove them
    export LD_PRELOAD=$(echo ${LD_PRELOAD} ${JEMALLOC_PATH})
fi

# Set TCMALLOC lib path
if [[ $TCMALLOC -eq 1 && -z "${DISABLE_TCMALLOC_VAR:-}" ]]; then
    if [ -f "${NANO_DIR}/libs/libtcmalloc.so" ]; then
        TCMALLOC_PATH="${NANO_DIR}/libs/libtcmalloc.so"
    elif [ -f "${LIB_DIR}/libtcmalloc.so" ]; then
        TCMALLOC_PATH="${LIB_DIR}/libtcmalloc.so"
    fi
    # the same as above
    export LD_PRELOAD=$(echo ${LD_PRELOAD} ${TCMALLOC_PATH})
fi

# Clean up perf var
if [[ "${PERF_VAR}" == "1" ]]; then
    unset PERF_VAR
fi

# Disable openmp or jemalloc according to options
if [ ! -z "${DISABLE_OPENMP_VAR:-}" ]; then
    unset OMP_NUM_THREADS
    unset KMP_AFFINITY
    unset KMP_BLOCKTIME
    unset DISABLE_OPENMP_VAR
    export LD_PRELOAD=`echo $LD_PRELOAD | sed "s/\s.*libiomp5\.so//g" | sed "s/.*libiomp5\.so\s*//g"`
fi
if [ -z "${ENABLE_JEMALLOC_VAR:-}" ]; then
    unset MALLOC_CONF
    export LD_PRELOAD=`echo $LD_PRELOAD | sed "s/\s.*libjemalloc\.so//g" | sed "s/.*libjemalloc\.so\s*//g"`
fi

if [ ! -z "${DISABLE_TCMALLOC_VAR:-}" ]; then
    unset DISABLE_TCMALLOC_VAR
    export LD_PRELOAD=`echo $LD_PRELOAD | sed "s/\s.*libtcmalloc\.so//g" | sed "s/.*libtcmalloc\.so\s*//g"`
fi

if [ -z "${CONDA_DEFAULT_ENV:-}" ]; then
    echo "Not in a conda env"
else
    if [ -f $CONDA_PREFIX/etc/conda/activate.d/nano_vars.sh ];then
        echo "nano_vars.sh already exists"
    elif [ ! -f $CONDA_PREFIX/bin/bigdl-nano-init ]; then
        echo "It seems that you are using bidl-nano installed by system's pip, "
        echo "you may need to 'source bgidl-nano-init' before using bigdl-nano "
        echo "and 'source bigdl-nano-unset-env' after using bigdl-nano yourself"
    else
        echo "Setting environment variables in current conda env"
        ACTIVATED_PATH=$CONDA_PREFIX/etc/conda/activate.d
        DEACTIVATED_PATH=$CONDA_PREFIX/etc/conda/deactivate.d
        mkdir -p $ACTIVATED_PATH
        mkdir -p $DEACTIVATED_PATH

        # bigdl-nano-init
        echo "if [ -f '${CONDA_PREFIX}/bin/bigdl-nano-init' ]; then" > $ACTIVATED_PATH/nano_vars.sh
        echo "    source ${CONDA_PREFIX}/bin/bigdl-nano-init" >> $ACTIVATED_PATH/nano_vars.sh
        echo "else" >> $ACTIVATED_PATH/nano_vars.sh
        echo "    echo 'Cannot find bigdl-nano-init, if you have uninstalled bigdl-nano, you may want to delete $ACTIVATED_PATH/nano_vars.sh and $DEACTIVATED_PATH/nano_vars.sh'" >> $ACTIVATED_PATH/nano_vars.sh
        echo "fi" >> $ACTIVATED_PATH/nano_vars.sh

        #bigdl-nano-unset-env
        echo "if [ -f '${CONDA_PREFIX}/bin/bigdl-nano-unset-env' ]; then" > $DEACTIVATED_PATH/nano_vars.sh
        echo "    source ${CONDA_PREFIX}/bin/bigdl-nano-unset-env" >> $DEACTIVATED_PATH/nano_vars.sh
        echo "else" >> $DEACTIVATED_PATH/nano_vars.sh
        echo "    echo 'Cannot find bigdl-nano-init, if you have uninstalled bigdl-nano, you may want to delete $ACTIVATED_PATH/nano_vars.sh and $DEACTIVATED_PATH/nano_vars.sh'" >> $DEACTIVATED_PATH/nano_vars.sh
        echo "fi" >> $DEACTIVATED_PATH/nano_vars.sh

        # warning
        echo "Added nano_vars.sh script to $ACTIVATED_PATH and $DEACTIVATED_PATH. You may want to delete them if you want to uninstall bigdl-nano."
    fi
fi

echo "+++++ Env Variables +++++"
echo "LD_PRELOAD=${LD_PRELOAD}"
echo "MALLOC_CONF=${MALLOC_CONF}"
echo "OMP_NUM_THREADS=${OMP_NUM_THREADS}"
echo "KMP_AFFINITY=${KMP_AFFINITY}"
echo "KMP_BLOCKTIME=${KMP_BLOCKTIME}"
echo "TF_ENABLE_ONEDNN_OPTS=${TF_ENABLE_ONEDNN_OPTS}"
echo "+++++++++++++++++++++++++"
echo "Complete."
