Created
April 10, 2013 21:52
-
-
Save rcoup/5358786 to your computer and use it in GitHub Desktop.
Parallel-ise an rsync transfer when you want multiple concurrent transfers happening,
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
#!/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={} $@ |
Amazing work @akorn!
Please take a look at: https://github.com/nathanhaigh/parallel-rsync/blob/main/prsync
Thanks, will evaluate this @xuanyuanaosheng.
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
I updated my zsh reimplementation of this script so it should now handle filenames with any funny characters in them. It still starts transferring immediately, without waiting for the full file list to be built first. Comments welcome.