From 5ea88c06dce17352d166f7a637dccbaf88586b03 Mon Sep 17 00:00:00 2001
From: Simon Rettberg
Date: Mon, 5 Jun 2023 16:42:41 +0200
Subject: [vmstore] Continuously drop caches while benchmarking

---
 modules-available/vmstore/inc/vmstorebenchmark.inc.php | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'modules-available/vmstore')

diff --git a/modules-available/vmstore/inc/vmstorebenchmark.inc.php b/modules-available/vmstore/inc/vmstorebenchmark.inc.php
index 3a696d04..b13f4e37 100644
--- a/modules-available/vmstore/inc/vmstorebenchmark.inc.php
+++ b/modules-available/vmstore/inc/vmstorebenchmark.inc.php
@@ -53,9 +53,15 @@ class VmStoreBenchmark
 		// do this the easy, synchronous way, we never could run more than four tests at the same time.
 		$command = <<<COMMAND
 (
-exec &> /dev/null < /dev/null
-setsid
-image_speedcheck --start $start --console $modeOption --file "$image" > "/tmp/speedcheck-$id"
+  exec &> /dev/null < /dev/null
+  setsid
+  while true; do
+    echo 3 > /proc/sys/vm/drop_caches
+    sleep 1
+  done &
+  flush=\$!
+  image_speedcheck --start $start --console $modeOption --file "$image" > "/tmp/speedcheck-$id"
+  kill \$flush
 ) &
 COMMAND;
 		$task = RebootControl::runScript($clients, $command);
-- 
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