commit ad4c22c1717a3d4a6862a9d5a331baa0ce625c93
Author: Michael Krayer <michael.krayer@partner.kit.edu>
Date:   Tue Apr 2 15:20:30 2024 +0200

    Created repo

diff --git a/prsync b/prsync
new file mode 100755
index 0000000..9a604d0
--- /dev/null
+++ b/prsync
@@ -0,0 +1,183 @@
+#!/bin/bash
+set -u 
+usage(){
+cat << EOF
+A wrapper around rsync which partitions the input files to blocks of roughly
+equal sizes and transfers them in multiple streams in parallel.
+
+Usage: $(basename $0) [rsync flags] <num_streams> <src>... <dest>
+Options:
+    <num_streams>               Number of blocks/transfer streams.
+    <src>                       Source files (potentially multiple files).
+    <dest>                      Destination of transfer.
+    -a, --archive               Activate rsyncs archive mode.
+    -h, --help                  Print this message.
+    -n, --dry-run               Do not transfer any data.
+    -r, --recursive             Copy directories recursively
+EOF
+}
+
+# Parse arguments
+declare -a positional flags_rsync flags_du
+positional=()
+flags_rsync=()
+flags_du=('-b')
+flag_copy_links=0
+flag_recursive=0
+while [[ $# -gt 0 ]]; do
+  case $1 in
+    '-h'|'--help')
+        usage
+        exit 0
+        ;;
+    '-a'|'--archive')
+        flags_rsync=+=('-a')
+        shift
+        ;;
+    '-L'|'--copy-links')
+        flag_copy_links=1
+        flags_du+=('-L')
+        shift
+        ;;
+    '-n'|'--dry-run')
+        flags_rsync+=('-n')
+        shift
+        ;;
+    '-r'|'--recursive')
+        flag_recursive=1
+        shift
+        ;;
+    -*|--*)
+        echo "Invalid option: $1" >&2
+        exit 1
+        ;;
+    *)
+        positional+=("$1")
+        shift
+        ;;
+  esac
+done
+
+declare -i num_args
+num_args=${#positional[@]}
+[[ $num_args -lt 3 ]] && usage && exit 1
+
+# Parse <num_streams>
+declare -i num_streams
+num_streams=${positional[0]}
+if [[ $num_streams -eq 0 ]]; then
+    echo "Error: invalid value for <num_streams> (${positional[0]})" >&2
+    exit 1
+fi
+
+# Parse source
+function walk_dir {
+    shopt -s nullglob dotglob
+    for path in "$1"/*; do
+        if [ -d "$path" ]; then
+            walk_dir "$path"
+        else
+            printf '%s\n' "$path"
+        fi
+    done
+}
+declare -a src
+for path in "${positional[@]:1:num_args-2}"; do
+    if [[ -L ${path} ]] && [[ $flag_copy_links -eq 0 ]]; then
+        continue
+    elif [[ -f ${path} ]]; then
+        src+=(${path})
+    elif [[ -d ${path} ]] && [[ ${flag_recursive} -ne 0 ]]; then
+        if [[ ${path:0:1} == '/' ]]; then
+            echo "Error: -r/--recursive does not support absolute paths"
+            exit 1
+        fi
+        src+=($(walk_dir ${path}))
+    fi
+done
+[[ ${#src[@]} -eq 0 ]] && exit 0
+
+# Get destination
+dest="${positional[-1]}"
+
+# Sort source files sorted by size
+declare -a filesize
+declare -i totalsize
+# src_sorted=($(du ${flags_du[@]} "${src[@]}" | sort -r -nk1 | awk '{print $2}'))
+tmp=$(du ${flags_du[@]} "${src[@]}" | sort -r -nk1)
+filesize=($(echo "$tmp" | awk '{print $1}'))
+src=($(echo "$tmp" | awk '{print $2}'))
+totalsize=$(IFS=+; echo "$((${filesize[*]}))")
+
+# Create file lists
+# dir_temp=$(mktemp -dt rsync.XXXXX)
+dir_temp="/scratch/rsync.MCbI5"
+for ((istream=0;istream<num_streams;istream++)); do
+    file_temp="${dir_temp}/rsync-stream-${istream}.files"
+    echo -n > $file_temp
+    for ((ii=${istream};ii<${#src[@]};ii+=num_streams)); do
+        echo "${src[ii]}" >> $file_temp
+    done
+done
+
+# Transfer data
+declare -a rsync_pids
+declare -i timer dt_transfer
+function rsync_sigint {
+    echo "Sending SIGINT to remaining streams..."
+    for pid in ${rsync_pids[@]}; do
+        kill -s SIGINT ${pid}
+    done
+}
+rsync_pids=()
+timer=$(date +%s%N)
+trap rsync_sigint SIGINT
+for ((istream=0;istream<num_streams;istream++)); do
+    file_temp="${dir_temp}/rsync-stream-${istream}.files"
+    file_log="${dir_temp}/rsync-stream-${istream}.log"
+    rsync -v ${flags_rsync[@]} $(cat $file_temp) $dest > $file_log &
+    rsync_pids+=($!)
+    echo "Started stream #${istream}... pid=${rsync_pids[istream]}, log=${file_log}"
+done
+for pid in ${rsync_pids[@]}; do
+    wait $pid 
+    echo "Process ${pid} finished with exit code $?"
+done
+
+# Evaluate time and print transfer info
+dt_transfer=$(($(date +%s%N) - timer))
+transfer_time=$(echo "$dt_transfer / 1000000000" | bc) # in second
+transfer_rate=$(echo "($totalsize * 1000000000) / $dt_transfer" | bc) # in byte/second
+function scale_bytes {
+    local str
+    declare -r OneKiB=1024
+    declare -r OneMiB=1048576
+    declare -r OneGiB=1073741824
+    declare -r OneTiB=1099511627776
+    if [ $1 -gt $OneTiB ]; then
+        str=$(echo "scale=2; $1 / $OneTiB" | bc -l)
+        str+=" TiB"
+    elif [ $1 -gt $OneGiB ]; then
+        str=$(echo "scale=2; $1 / $OneGiB" | bc -l)
+        str+=" GiB"
+    elif [ $1 -gt $OneMiB ]; then
+        str=$(echo "scale=2; $1 / $OneMiB" | bc -l)
+        str+=" MiB"
+    elif [ $1 -gt $OneKiB ]; then
+        str=$(echo "scale=2; $1 / $OneKiB" | bc -l)
+        str+=" KiB"
+    else
+        str="$1 B"
+    fi
+    echo -n $str
+}
+function scale_time {
+    local h m s
+    h=$(echo "$1 / 3600" | bc)
+    m=$(echo "($1 % 3600)/60" | bc)
+    s=$(echo "$1 % 60" | bc)
+    [[ $h -gt 0 ]] && printf "%dh " $h
+    [[ $m -gt 0 ]] && printf "%dm " $m
+    printf "%ds" $s
+}
+echo "Transferred $(scale_bytes $totalsize) in $(scale_time $transfer_time) ($(scale_bytes $transfer_rate)/s)."