#!/bin/bash
set -u

function print_usage()
{
    cat << EOF
$(basename "$0") -- CUDA API Summary

    No arguments.

    Output: All time values given in nanoseconds
        Time(%) : Percentage of "Total Time"
        Total Time : The total time used by all executions of this function
        Num Calls: The number of calls to this function
        Average : The average execution time of this function
        Minimum : The smallest execution time of this function
        Maximum : The largest execution time of this function
        Name : The name of the function

    This report provides a summary of CUDA API functions and their
    execution times. Note that the "Time(%)" column is calculated
    using a summation of the "Total Time" column, and represents that
    function's percent of the execution time of the functions listed,
    and not a percentage of the application wall or CPU execution time.
EOF
}

### BEGIN include inc_setup ###

EXIT_HELP=25
EXIT_DB=26
EXIT_NODATA=27

# Verify number of params
if [ $# -lt 1 ]
then
    print_usage ${BASH_SOURCE[0]}
    exit ${EXIT_HELP}
fi

# Set DB file
DATABASE="$1"

# Verify DB file exists
if [ ! -f "${DATABASE}" ]
then
    exit ${EXIT_DB}
fi

# Verify DB file contents
# The sqlite3 file format is defined at https://sqlite.org/fileformat.html
DB_FILE_HEADER=$(head -c 16 "$DATABASE" | tr '\0' '\n')
if [ "${DB_FILE_HEADER}" != "SQLite format 3" ]
then
    exit ${EXIT_DB}
fi

# Helper function for error messages
function echoerr() # accepts multiple args
{
    echo "$@" >&2
}

# Setup standard vars

# If we were run by nsys, the path to the preferred sqlite3 should have been
# passed as an env-var.  If not, hope the user has it in their path.
SQLITE3="${NSYS_STATS_SCRIPTS_SQLITE:-sqlite3}"
SQLITE3OPTS="-header -csv -readonly"

RUN_SQLITE="eval \"${SQLITE3}\" ${SQLITE3OPTS} \"${DATABASE}\""

### END include inc_setup ###

### BEGIN: include from inc_table_exists ###

TABLE_EXISTS_TABLES=( )

function table_exists()
{
    local TABLE_NAME=$1

    if [ "${#TABLE_EXISTS_TABLES[@]}" -eq 0 ]
    then
        TABLE_EXISTS_TABLES=( $("${SQLITE3}" ${SQLITE3OPTS} "${DATABASE}" \
                "SELECT name FROM sqlite_master WHERE type = 'table' OR type = 'view'") )
    fi

    for TABLE in "${TABLE_EXISTS_TABLES[@]}"
    do
        if [ "${TABLE}" = "${TABLE_NAME}" ]
        then
            echo "true"
            return 1
        fi
    done
    echo "false"
    return 0
}

### END: include from inc_table_exists ###


if ! $(table_exists "CUPTI_ACTIVITY_KIND_RUNTIME")
then
    echoerr "$DATABASE does not contain CUDA trace data."
    exit ${EXIT_NODATA}
fi

${RUN_SQLITE} << EOF

WITH
    summary AS (
        SELECT
            nameId AS nameId,
            sum(end - start) AS total,
            count(*) AS num,
            avg(end - start) AS avg,
            min(end - start) AS min,
            max(end - start) AS max
        FROM
            CUPTI_ACTIVITY_KIND_RUNTIME
        GROUP BY 1
    ),
    totals AS (
        SELECT sum(total) AS total
        FROM summary
    )
SELECT
    round(summary.total * 100.0 / totals.total, 1) AS "Time(%)",
    summary.total AS "Total Time (ns)",
    summary.num AS "Num Calls",
    round(summary.avg, 1) AS "Average",
    summary.min AS "Minimum",
    summary.max AS "Maximum",
    CASE substr(ids.value, -6, 2)
        WHEN '_v' THEN substr(ids.value, 1, length(ids.value)-6)
        ELSE ids.value
    END AS "Name"
FROM
    summary
CROSS JOIN
    totals
INNER JOIN
    StringIds AS ids
    ON ids.id = summary.nameId
ORDER BY 2 DESC
;

EOF
