[PATCH 4/4] test: Rewrite test_iperf3

[David Gibson <david@gibson.dropbear.id.au>]

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test_iperf3() is a pretty inscrutable mess of nested background processes.
It has a number of magic sleeps whose value needs to match the durations of
the tests which are given in the DSL test files.

Rewrite it to be cleaner:
  * Use the construct (a & b & wait) to run 'a' and 'b' in parallel, but
    then wait for them both to complete before continuing
  * This allows us to wait for both the server and client to finish, rather
    than having arbitrary sleeps and kills
  * Use jq to do all the math we need to get the final result, rather than
    jq followed by some complicated 'bc' mangling

Signed-off-by: David Gibson <david(a)gibson.dropbear.id.au>
---
 .gitignore          |  1 +
 test/lib/test       | 68 ++++++++++++++++++---------------------------
 test/perf/passt_tcp |  4 +--
 test/perf/pasta_tcp |  2 +-
 4 files changed, 31 insertions(+), 44 deletions(-)

diff --git a/.gitignore b/.gitignore
index 9b17f12..80967f3 100644
--- a/.gitignore
+++ b/.gitignore
@@ -7,4 +7,5 @@
 /pasta.1
 /seccomp.h
 /*.pid
+/s*.json
 README.plain.md
diff --git a/test/lib/test b/test/lib/test
index 8eb1ee5..d4357b7 100755
--- a/test/lib/test
+++ b/test/lib/test
@@ -30,54 +30,40 @@ test_iperf3() {
 	__procs="$((${1} - 1))"; shift
 	__time="${1}"; shift
 
-	pane_run "${__spane}" 'for i in $(seq 0 '${__procs}'); do'	\
-		':> s${i}.bw; done'
+	pane_run "${__spane}" 						\
+		 '('							\
+		 '	for i in $(seq 0 '${__procs}'); do'		\
+		 '		iperf3 -s1J -p'${__port}' -i'${__time}	\
+		 '		   > s${i}.json &'			\
+		 '	done;'						\
+		 '	wait'						\
+		 ')'
+
+	pane_run "${__cpane}" 						\
+		 '('							\
+		 '	for i in $(seq 0 '${__procs}'); do'		\
+		 '		iperf3 -c '${__dest}' -p '${__port}	\
+		 '		  -t'${__time}' -T s${i} '"${@}"' &'	\
+		 '	done;'						\
+		 '	wait'						\
+		 ')'
+
+	pane_status "${__cpane}"
 	pane_status "${__spane}"
 
-	__udp=0
+	__jval=".end.sum_received.bits_per_second"
 	for __opt in ${@}; do
-	    [ "${__opt}" = "-u" ] && __udp=1
+		# UDP test
+		[ "${__opt}" = "-u" ] && __jval=".intervals[0].sum.bits_per_second"
 	done
 
-	(
-		sleep 2
-		pane_run "${__cpane}" 'for i in $(seq 0 '${__procs}');'	\
-			 'do ( iperf3 -c '"${__dest}"' -p '"${__port}"	\
-			 '-t'${__time} "${@}" ' -T s${i} & echo $! > c${i}.pid & ); done'
-		sleep $(echo ${__time} + 10 | bc -l)
-		pane_run "${__cpane}" 'for i in $(seq 0 '${__procs}'); do'\
-			 'kill -INT $(cat c${i}.pid) 2>/dev/null; done'
-	) &
-
-	if [ ${__udp} -eq 0 ]; then
-		pane_run "${__spane}" 'for i in $(seq 0 '${__procs}');'	\
-			'do ( ( iperf3 -s1J -p '"${__port}"		\
-			'& echo $! > s${i}.pid ) 2>/dev/null'		\
-			'| jq -rM ".end.sum_received.bits_per_second"'	\
-			'> s${i}.bw & );'				\
-			'done'
-	else
-		pane_run "${__spane}" 'for i in $(seq 0 '${__procs}');'	\
-			'do ( ( iperf3 -s1J -i '${__time}' -p '"${__port}"	\
-			'& echo $! > s${i}.pid ) 2>/dev/null'		\
-			'| jq -rM ".intervals[0].sum.bits_per_second"'	\
-			'> s${i}.bw & );'				\
-			'done'
-	fi
-
-	pane_status "${__spane}"
-	sleep $(echo ${__time} + 15 | bc -l)
-	pane_run "${__spane}" 'for i in $(seq 0 '${__procs}'); do'	\
-		 'kill -INT $(cat s${i}.pid) 2>/dev/null; done'
-	sleep 4
-	pane_wait "${__spane}"
-	pane_run "${__spane}" '(cat s*.bw |'				\
-		'sed '"'"'s/\(.*\)/\1\+/g'"'"' |'			\
-		'tr -d "\n"; echo 0) | bc -l'
+	pane_run "${__spane}"						\
+		 'cat s*.json | jq -rMs "map('${__jval}') | add"'
 	pane_wait "${__spane}"
 	__bw="$(pane_parse "${__spane}")"
-	pane_run "${__spane}" 'for i in $(seq 0 '${__procs}'); do'	\
-		'rm -f [cs]${i}.bw [cs]${i}.pid; done'
+
+	pane_run "${__spane}"						\
+		'for i in $(seq 0 '${__procs}'); do rm s${i}.json; done'
 	pane_status "${__spane}"
 
 	TEST_ONE_subs="$(list_add_pair "${TEST_ONE_subs}" "__${__var}__" "${__bw}" )"
diff --git a/test/perf/passt_tcp b/test/perf/passt_tcp
index a960341..45095b6 100644
--- a/test/perf/passt_tcp
+++ b/test/perf/passt_tcp
@@ -11,8 +11,8 @@
 # Copyright (c) 2021 Red Hat GmbH
 # Author: Stefano Brivio <sbrivio(a)redhat.com>
 
-gtools	sysctl ip jq nproc seq sleep bc iperf3 tcp_rr tcp_crr # From neper
-nstools	sysctl ip jq nproc seq sleep bc iperf3 tcp_rr tcp_crr
+gtools	sysctl ip jq nproc seq sleep iperf3 tcp_rr tcp_crr # From neper
+nstools	sysctl ip jq nproc seq sleep iperf3 tcp_rr tcp_crr
 htools	bc head sed seq
 
 # In this setup, virtio_net TX queue sometimes hangs, still under investigation
diff --git a/test/perf/pasta_tcp b/test/perf/pasta_tcp
index d607029..fc9e408 100644
--- a/test/perf/pasta_tcp
+++ b/test/perf/pasta_tcp
@@ -12,7 +12,7 @@
 # Author: Stefano Brivio <sbrivio(a)redhat.com>
 
 htools	head ip seq bc sleep iperf3 tcp_rr tcp_crr jq sed
-nstools	sysctl nproc ip seq bc sleep iperf3 tcp_rr tcp_crr jq sed
+nstools	sysctl nproc ip seq sleep iperf3 tcp_rr tcp_crr jq sed
 
 test	pasta: throughput and latency (local connections)
 
-- 
@@ -12,7 +12,7 @@
 # Author: Stefano Brivio <sbrivio(a)redhat.com>
 
 htools	head ip seq bc sleep iperf3 tcp_rr tcp_crr jq sed
-nstools	sysctl nproc ip seq bc sleep iperf3 tcp_rr tcp_crr jq sed
+nstools	sysctl nproc ip seq sleep iperf3 tcp_rr tcp_crr jq sed
 
 test	pasta: throughput and latency (local connections)
 
-- 
2.37.2