Created
April 10, 2013 21:52
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Parallel-ise an rsync transfer when you want multiple concurrent transfers happening,
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#!/bin/bash | |
set -e | |
# Usage: | |
# rsync_parallel.sh [--parallel=N] [rsync args...] | |
# | |
# Options: | |
# --parallel=N Use N parallel processes for transfer. Defaults to 10. | |
# | |
# Notes: | |
# * Requires GNU Parallel | |
# * Use with ssh-keys. Lots of password prompts will get very annoying. | |
# * Does an itemize-changes first, then chunks the resulting file list and launches N parallel | |
# rsyncs to transfer a chunk each. | |
# * be a little careful with the options you pass through to rsync. Normal ones will work, you | |
# might want to test weird options upfront. | |
# | |
if [[ "$1" == --parallel=* ]]; then | |
PARALLEL="${1##*=}" | |
shift | |
else | |
PARALLEL=10 | |
fi | |
echo "Using up to $PARALLEL processes for transfer..." | |
TMPDIR=$(mktemp -d) | |
trap "rm -rf $TMPDIR" EXIT | |
echo "Figuring out file list..." | |
# sorted by size (descending) | |
rsync $@ --out-format="%l %n" --no-v --dry-run | sort -n -r > $TMPDIR/files.all | |
# check for nothing-to-do | |
TOTAL_FILES=$(cat $TMPDIR/files.all | wc -l) | |
if [ "$TOTAL_FILES" -eq "0" ]; then | |
echo "Nothing to transfer :)" | |
exit 0 | |
fi | |
function array_min { | |
# return the (index, value) of the minimum element in the array | |
IC=($(tr ' ' '\n' <<<$@ | cat -n | sort -k2,2nr | tail -n1)) | |
echo $((${IC[0]} - 1)) ${IC[1]} | |
} | |
echo "Calculating chunks..." | |
# declare chunk-size array | |
for ((I = 0 ; I < PARALLEL ; I++ )); do | |
CHUNKS["$I"]=0 | |
done | |
# add each file to the emptiest chunk, so they're as balanced by size as possible | |
while read FSIZE FPATH; do | |
MIN=($(array_min ${CHUNKS[@]})) | |
CHUNKS["${MIN[0]}"]=$((${CHUNKS["${MIN[0]}"]} + $FSIZE)) | |
echo $FPATH >> $TMPDIR/chunk.${MIN[0]} | |
done < $TMPDIR/files.all | |
find "$TMPDIR" -type f -name "chunk.*" -printf "\n*** %p ***\n" -exec cat {} \; | |
echo "Starting transfers..." | |
find "$TMPDIR" -type f -name "chunk.*" | parallel -j $PARALLEL -t --verbose --progress rsync --files-from={} $@ |
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Please take a look at: https://github.com/nathanhaigh/parallel-rsync/blob/main/prsync