add some contrib scripts

contrib/pixelvnc.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+# run vnc viewer in fullscreen on the selected monitor.
+# restarts it on connectivity issues, press ctrl-c TWICE to quit.
+#
+# usage:      pixelvnc.sh [<host>[:<port>] [monitor-index]]
+# depends on: tigervnc
+
+host=${1:=vnc.schenklklopfer.de}
+screen=${2:=1}
+
+while :; do
+  vncviewer ReconnectOnError=0 ViewOnly=1 FullScreen=1 FullScreenMode=Selected FullScreenSelectedMonitors=$screen $host
+  sleep 1 # give room to ^C out of the loop
+done
+

contrib/setup_bbr.sh

@@ -0,0 +1,32 @@
+#!/bin/sh
+
+# sets up BBR congestion control (https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next.git/commit/?id=0f8782ea14974ce992618b55f0c041ef43ed0b78)
+# for the given interface
+
+DEV=${$1:=eth0}
+MODE=${$2:="temporary"}
+
+echo pre-run state:
+echo `sysctl net.ipv4.tcp_congestion_control`
+echo qdisc on $DEV: `tc qdisc show dev $DEV`
+
+# set required "fair queueing" queuing discipline (man tc-fq)
+echo "qdisc on $DEV was:     `tc qdisc show dev $DEV`"
+tc qdisc replace dev $DEV root fq
+echo "qdisc on $DEV now is:  `tc qdisc show dev $DEV`"
+
+# (permanently) configure BBR
+if [[ mode == "temporary" ]]; then
+    echo -e 'net.core.default_qdisc=fq
+    net.ipv4.tcp_congestion_control=bbr' | sysctl -p-
+elif [[ mode == "permanent"]]; then
+    echo -e 'net.core.default_qdisc=fq
+    net.ipv4.tcp_congestion_control=bbr' >> /etc/sysctl.d/20-net-bbr.conf
+    sysctl -p /etc/sysctl.d/20-net-bbr.conf
+    algo=`sysctl net.ipv4.tcp_congestion_control`
+    if [[ "$algo" != 'net.ipv4.tcp_congestion_control = bbr' ]]; then
+        echo "couldn't apply changes at runtime, you should reboot."
+    fi
+else
+    echo "unknown mode, congestion control algo unchanged"
+fi

rpc/test.sh

@@ -1,29 +0,0 @@
-#!/bin/bash
-
-# runs two instances of hochwasser (rpc server & client each) against a fake (iperf)
-# pixelflut server for a few seconds, and opens pprof afterwar
-
-runtime=${1:-"2s"}
-
-function cleanup {
-  kill ${pids[@]} > /dev/null 2>&1
-}
-trap cleanup EXIT
-
-wd=$(dirname "$0")
-pids=()
-
-iperf -p 1337 -s > /dev/null 2>&1 &
-pids+=($!)
-
-go run . -image $wd/../benchmarks/black_small.png -rán :1234 &
-pids+=($!)
-sleep 0.2
-
-go run . -image $wd/../benchmarks/white_small.png -hevring :1234 -runtime "$runtime" -cpuprofile hevring.prof
-pids+=($!)
-
-cleanup
-
-go tool pprof -http :8080 Hochwasser hevring.prof
-#go tool pprof -http :8081 Hochwasser ran.prof