[scripts] add environments UWSGI_WORKERS and UWSGI_THREADS

- UWSGI_WORKERS specifies the number of process.
- UWSGI_THREADS specifies the number of threads.

Templates for uwsgi scripts can be tested by::

    UWSGI_WORKERS=8 UWSGI_THREADS=9 \
      ./utils/searxng.sh --cmd\
      eval "echo \"$(cat utils/templates/etc/uwsgi/*/searxng.ini*)\""\
      | grep "workers\|threads"

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

utils/searxng.sh

@@ -177,6 +177,7 @@ main() {
 
     case $1 in
         --getenv)  var="$2"; echo "${!var}"; exit 0;;
+        --cmd)  shift; "$@";;
         -h|--help) usage; exit 0;;
         install)
             sudo_or_exit

utils/templates/etc/uwsgi/apps-archlinux/searxng.ini

@@ -47,6 +47,9 @@ plugin = python
 # default behaviour is for performance reasons.
 enable-threads = true
 
+# Number of workers (usually CPU count)
+workers = ${UWSGI_WORKERS:-%k}
+threads = ${UWSGI_THREADS:-4}
 
 # plugin: python
 # --------------

utils/templates/etc/uwsgi/apps-archlinux/searxng.ini:socket

@@ -47,6 +47,9 @@ plugin = python
 # default behaviour is for performance reasons.
 enable-threads = true
 
+# Number of workers (usually CPU count)
+workers = ${UWSGI_WORKERS:-%k}
+threads = ${UWSGI_THREADS:-4}
 
 # plugin: python
 # --------------

utils/templates/etc/uwsgi/apps-available/searxng.ini

@@ -50,6 +50,9 @@ plugin = python3,http
 # default behaviour is for performance reasons.
 enable-threads = true
 
+# Number of workers (usually CPU count)
+workers = ${UWSGI_WORKERS:-%k}
+threads = ${UWSGI_THREADS:-4}
 
 # plugin: python
 # --------------

utils/templates/etc/uwsgi/apps-available/searxng.ini:socket

@@ -50,6 +50,9 @@ plugin = python3,http
 # default behaviour is for performance reasons.
 enable-threads = true
 
+# Number of workers (usually CPU count)
+workers = ${UWSGI_WORKERS:-%k}
+threads = ${UWSGI_THREADS:-4}
 
 # plugin: python
 # --------------