Get stats from golang memory allocation trace log

stat_alloc_trace.sh

#!/bin/bash

function realpath() {
  local file_path="$1"
  pushd $(dirname "$file_path") > /dev/null 2>&1
  echo `pwd -P`/`basename "$file_path"`
  popd > /dev/null 2>&1
}

function usage() {
  echo "USAGE: $0 <package_name> <log_file>" >&2
  exit 2
}

[ $# -ne 2 ] && usage

declare PACKAGE_NAME=$(echo $1 | sed 's~\/~\\\/~g'); shift
declare INPUT_FILE=$(realpath "$1"); shift
declare TEMPDIR=`mktemp -d /tmp/stat_alloc.XXXXXX` || exit 1

pushd $TEMPDIR > /dev/null 2>&1
split -a 5 -p '^\s*$' $INPUT_FILE alloc_ || exit 1

declare -i i=0
declare allfiles=(*)
declare -i numfiles=${#allfiles[@]}
unset allfiles
stats=$(for f in * ; do
  echo -ne "\rProcessed: $((100*i++/numfiles))%" >&2
  awk "/^$PACKAGE_NAME/ { gsub(/\([a-z0-9x,\. ]+\)\$/, \"\"); print \$0; exit }" "$f"
done)
echo -ne "\r"
echo "$stats" | sort | uniq -c | sort -nr
popd > /dev/null 2>&1

rm -rf $TEMPDIR