From 0bd4793492e528e812709b1f0278e09cb8e100cd Mon Sep 17 00:00:00 2001
From: MilhouseVH <milhouseVH.github@nmacleod.com>
Date: Wed, 29 May 2019 00:56:10 +0100
Subject: [PATCH] buildsystem: avoid process forks to init dashboard status
 file

A typical image build will update the dashboard 3500-4500 times. This change
avoids two process forks (cat, wc) per update, and the remaining $(< file) is
faster than $(cat file).
---
 config/functions   | 7 +++++--
 config/multithread | 1 +
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/config/functions b/config/functions
index 2c5529b70f..85579cf4de 100644
--- a/config/functions
+++ b/config/functions
@@ -1322,8 +1322,11 @@ update_dashboard() {
 
   sedline=$((MTJOBID + 2))
 
-  num=$(cat "${THREAD_CONTROL}/status" | wc -l)
-  while [ ${num} -lt ${sedline} ]; do echo "" >>"${THREAD_CONTROL}/status"; num=$((num + 1)); done
+  num=$(< "${THREAD_CONTROL}/status.max")
+  if [ ${num} -lt ${sedline} ]; then
+    echo ${sedline} >"${THREAD_CONTROL}/status.max"
+    for i in $(seq $((num + 1)) ${sedline}); do echo "" >>"${THREAD_CONTROL}/status"; done
+  fi
 
   num=$(< "${THREAD_CONTROL}/progress.prev")
   projdevarch="${PROJECT}/"
diff --git a/config/multithread b/config/multithread
index 902c6f5a83..ca389cddbe 100644
--- a/config/multithread
+++ b/config/multithread
@@ -144,6 +144,7 @@ start_multithread_build() {
   mkdir -p "${THREAD_CONTROL}/locks"
   echo -1 >"${THREAD_CONTROL}/progress.prev"
   echo 0 >"${THREAD_CONTROL}/progress"
+  echo 0 >"${THREAD_CONTROL}/status.max"
   touch "${THREAD_CONTROL}/status"
 
   [ "${THREADCOUNT}" = "0" ] && THREADCOUNT=1