Christoph: Created page with "'''tcpkali''' is a high performance TCP and WebSocket load generator and sink. ==Test concurrent TCP connections between two machines== ; Host + Client VM setup NOTE: Run t..."

2019-05-14T00:04:07Z

Created page with "'''tcpkali''' is a high performance TCP and WebSocket load generator and sink. ==Test concurrent TCP connections between two machines== ; Host + Client VM setup NOTE: Run t..."

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'''tcpkali''' is a high performance TCP and WebSocket load generator and sink.

==Test concurrent TCP connections between two machines==

; Host + Client VM setup

NOTE: Run the following commands on ''both'' the Host and the Client VMs/instances.

* Install <code>tcpkali</code>:
<pre>
$ sudo yum update -y
$ sudo yum install -y autoconf automake libtool bison flex gcc-c++ ncurses-devel git
$ git clone https://github.com/satori-com/tcpkali.git
$ cd tcpkali/
$ test -f configure || autoreconf -iv
$ ./configure
$ make
$ sudo make install
</pre>

* Install <code>socat</code>:
<pre>
$ sudo yum install -y socat
</pre>

* Change kernel settings:
<pre>
$ sudo echo 1 >/proc/sys/net/ipv4/tcp_tw_reuse
</pre>

* Add the following lines to the <code>/etc/security/limits.conf</code> file:
<pre>
@wheel soft nofile 6000
@wheel hard nofile 65335
<pre>
Then,
<pre>
$ sudo sysctl -p
$ ulimit -a
$ ulimit -Sn # [soft] maximum number of open file descriptors
$ ulimit -Hn # [hard] maximum number of open file descriptors
</pre>

; Host VM setup

NOTE: Run the following commands ''only'' on the Host VM/instance.

* Start up <code>socat</code> (in the background):
<pre>
$ sudo socat -v tcp-l:443,fork exec:'/bin/cat' &
</pre>

* Watch for "ESTABLISHED" connections on the host:
<pre>
$ export TCP_LOGFILE=tcp.log
while true; do
netstat -an | grep "ESTABLISHED" | grep -v :22 | \
echo -e "$(date +%s)\t$(wc -l)" | tee -a ${TCP_LOGFILE}; sleep 1;
done
</pre>

; Client VM setup

NOTE: Run the following commands ''only'' on the Client VM/instance.

* Run <code>tcpkali</code> on Client VM:
<pre>
$ export HOST_IP=x.x.x.x
$ export HOST_PORT=443
$ export CONNECTIONS=1000 # Connections to keep open to the destination(s)
$ export WORKERS=2 # Number of parallel threads to use
$ export DURATION=1000 # Exit after the specified amount of time (in seconds)

# --latency-connect Measure TCP connection establishment latency
# --latency-first-byte Measure time to first byte latency
# --latency-marker <string> Measure latency using a per-message marker
# --latency-marker-skip <N> Ignore the first N occurrences of a marker
# --latency-percentiles <list> Report latency at specified percentiles
$ export LATENCY_OPTION=--latency-connect

$ tcpkali ${HOST_IP}:${HOST_PORT} \
--connections=${CONNECTIONS} \
--workers=${WORKERS} \
--duration=${DURATION} \
${LATENCY_OPTION} \
--verbose=3 # [0..3]
</pre>

==External links==
* [https://github.com/satori-com/tcpkali Official website]

[[Category:Linux Command Line Tools]]

Tcpkali - Revision history

Christoph: Created page with "'''tcpkali''' is a high performance TCP and WebSocket load generator and sink. ==Test concurrent TCP connections between two machines== ; Host + Client VM setup NOTE: Run t..."