mscp, a variant of scp, copies files over multiple ssh (SFTP)
connections. Multiple threads and connections in mscp transfer (1)
multiple files simultaneously and (2) a large file in parallel. It
would shorten the waiting time for transferring a lot of/large files
over networks.
You can use mscp like scp, for example, mscp user@example.com:srcfile /tmp/dstfile. Remote hosts only need to run
standard sshd supporting the SFTP subsystem (e.g. openssh-server),
and you need to be able to ssh to the hosts as usual. mscp does not
require anything else.
mscp-demo.mp4
Differences from scp on usage:
- Remote-to-remote copy is not supported.
-roption is not needed to transfer directories.- and any other differences I have not implemented and noticed.
- macOS
brew install upa/tap/mscp- Ubuntu 22.04
wget https://github.com/upa/mscp/releases/latest/download/mscp_ubuntu-22.04-x86_64.deb
apt-get install -f ./mscp_ubuntu-22.04-x86_64.deb- Ubuntu 20.04
wget https://github.com/upa/mscp/releases/latest/download/mscp_ubuntu-20.04-x86_64.deb
apt-get install -f ./mscp_ubuntu-20.04-x86_64.deb- Rocky 8.8
yum install https://github.com/upa/mscp/releases/latest/download/mscp_rocky-8.8-x86_64.rpm- Alma 8.8
yum install https://github.com/upa/mscp/releases/latest/download/mscp_almalinux-8.8-x86_64.rpm- Linux with single binary
mscp(x86_64 only)
wget https://github.com/upa/mscp/releases/latest/download/mscp.linux.x86.static -O /usr/local/bin/mscp
chmod 755 /usr/local/bin/mscpmscp depends on a patched libssh. The patch introduces asynchronous SFTP Write, which is derived from https://github.com/limes-datentechnik-gmbh/libssh (see Re: SFTP Write async).
Currently macOS and Linux (Ubuntu, Rocky and Alma) are supported.
# clone this repository
git clone https://github.com/upa/mscp.git
cd mscp
# prepare patched libssh
git submodule update --init
patch -d libssh -p1 < patch/libssh-0.10.4.patch
# install build dependency
bash ./scripts/install-build-deps.sh
# configure mscp
mkdir build && cd build
cmake ..
# in macOS, you may need OPENSSL_ROOT_DIR for cmake:
# cmake .. -DOPENSSL_ROOT_DIR=$(brew --prefix)/opt/openssl@1.1
# build
make
# install the mscp binary to CMAKE_INSTALL_PREFIX/bin (usually /usr/local/bin)
make installSource tar balls (mscp-X.X.X.tar.gz, not Source code) in
Releases page contains the patched version
of libssh. So you can start from cmake with it.
- Usage
$ mscp
mscp v0.0.8: copy files over multiple ssh connections
Usage: mscp [vqDHdNh] [-n nr_conns] [-m coremask] [-u max_startups]
[-s min_chunk_sz] [-S max_chunk_sz] [-a nr_ahead] [-b buf_sz]
[-l login_name] [-p port] [-i identity_file]
[-c cipher_spec] [-M hmac_spec] [-C compress] source ... target- Example: copy a 15GB file on memory over a 100Gbps link
- Two Intel Xeon Gold 6130 machines directly connected with Intel E810 100Gbps NICs.
- Default
openssh-serverruns on the remote host.
$ mscp /var/ram/test.img 10.0.0.1:/var/ram/
[======================================] 100% 15GB/15GB 1.7GB/s 00:00 ETA# with some optimizations. top speed reaches 3.0GB/s.
$ mscp -n 5 -m 0x1f -c aes128-gcm@openssh.com /var/ram/test.img 10.0.0.1:/var/ram/
[======================================] 100% 15GB/15GB 2.4GB/s 00:00 ETA-voption increments verbose output level.
$ mscp test 10.0.0.1:
[=======================================] 100% 49B /49B 198.8B/s 00:00 ETA$ mscp -vv test 10.0.0.1:
file: test/test1 -> ./test/test1
file: test/testdir/asdf -> ./test/testdir/asdf
file: test/testdir/qwer -> ./test/testdir/qwer
file: test/test2 -> ./test/test2
we have only 4 chunk(s). set number of connections to 4
connecting to localhost for a copy thread...
connecting to localhost for a copy thread...
connecting to localhost for a copy thread...
copy start: test/test1
copy start: test/test2
copy start: test/testdir/asdf
copy start: test/testdir/qwer
copy done: test/test1
copy done: test/test2
copy done: test/testdir/qwer
copy done: test/testdir/asdf
[=======================================] 100% 49B /49B 198.1B/s 00:00 ETA- Full usage
$ mscp -h
mscp v0.0.9-11-g5802679: copy files over multiple ssh connections
Usage: mscp [vqDHdNh] [-n nr_conns] [-m coremask] [-u max_startups]
[-s min_chunk_sz] [-S max_chunk_sz] [-a nr_ahead] [-b buf_sz]
[-l login_name] [-p port] [-F ssh_config] [-i identity_file]
[-c cipher_spec] [-M hmac_spec] [-C compress] source ... target
-n NR_CONNECTIONS number of connections (default: floor(log(cores)*2)+1)
-m COREMASK hex value to specify cores where threads pinned
-u MAX_STARTUPS number of concurrent outgoing connections (default: 8)
-s MIN_CHUNK_SIZE min chunk size (default: 64MB)
-S MAX_CHUNK_SIZE max chunk size (default: filesize/nr_conn)
-a NR_AHEAD number of inflight SFTP commands (default: 32)
-b BUF_SZ buffer size for i/o and transfer
-v increment verbose output level
-q disable output
-D dry run. check copy destinations with -vvv
-r no effect
-l LOGIN_NAME login name
-p PORT port number
-F CONFIG path to user ssh config (default ~/.ssh/config)
-i IDENTITY identity file for public key authentication
-c CIPHER cipher spec
-M HMAC hmac spec
-C COMPRESS enable compression: yes, no, zlib, zlib@openssh.com
-H disable hostkey check
-d increment ssh debug output level
-N enable Nagle's algorithm (default disabled)
-h print this helpNote: mscp is still under development, and the author is not responsible for any accidents due to mscp.