Processing queues results in out of memory errors

[graber-1]

Describe the bug
This happens when invoking a Drush process from a drush command:

    $site_alias = $this->siteAliasManager()->getSelf();
    $process = $this->processManager()->drush($site_alias, QueueCommands::RUN, ['some_queue_name']);
    $process->run($process->showRealtime()->hideStdout());

The same queue is processed with cron without out of memory errors, the queue has around 1000 items.

Workaround
I implemented processing in batches, something like:

    $site_alias = $this->siteAliasManager()->getSelf();
    $process = $this->processManager()->drush($site_alias, QueueCommands::RUN, ['some_queue_name']);
 
   do {
      // Enqueue a batch of items.
        $this->someEnqueuer->enqueueBatch($sandbox);

        // Process queue.
        $process->run($process->showRealtime()->hideStdout());
      }

    } while (!$this->someEnqueuer->someIsFinishedMethod());