Synchronized wpallimport with php-cli. This is really a big hack and I think that wpallimport should be avoided. But if you have to stick with it and need to do multiple imports after each other this works.

synchronized-wpallimport.sh

#!/bin/bash
set -ex

# This is a hack to use wpallimport without http request.
# We need this to be synchronized so that importers don't overlap and cause too much strain

# Import Asunnot with wpallimport
php -e -r 'parse_str("import_key=XXXXXXXXX&import_id=16&action=trigger", $_GET); include "/data/code/web/wp/wp-cron.php";'

# Wait until importer is ready
while true; do
  importer_result=$(php -e -r 'set_time_limit(10); parse_str("import_key=XXXXXXXXX&import_id=16&action=processing", $_GET); include "/data/code/web/wp/wp-cron.php";')
  echo $importer_result
  if [ "$importer_result" != "" ] && echo $importer_result | grep 'already processing'; then
    sleep 60
  else
    break
  fi
done

# Import Henkilot with wpallimport
php -e -r 'parse_str("import_key=XXXXXXXXX&import_id=14&action=trigger", $_GET); include "/data/code/web/wp/wp-cron.php";'

# Wait until importer is ready
while true; do
  importer_result=$(php -e -r 'set_time_limit(10); parse_str("import_key=XXXXXXXXX&import_id=14&action=processing", $_GET); include "/data/code/web/wp/wp-cron.php";')
  echo $importer_result
  if [ "$importer_result" != "" ] && echo $importer_result | grep 'already processing'; then
    sleep 60
  else
    break
  fi
done