Cache clear cause high server load

So I believe that you might have something updating during the cron job. For whatever reason, everything gets purged when the cron job hits.

If you are comfortable editing code, please go to our file litespeed-cache/includes/class-litespeed-cache.php
Inside, there is a function add_purge_tags. At the top of the function add the following:
error_log('purge tags ' . $tags);

So that it looks like:

	private function add_purge_tags($tags, $is_public = true)
	{
error_log('purge tags ' . $tags);
		//TODO: implement private tag add
		if (is_array($tags)) {
			$this->pub_purge_tags = array_merge($this->pub_purge_tags, $tags);
		}
		else {
			$this->pub_purge_tags[] = $tags;
		}
		$this->pub_purge_tags = array_unique($this->pub_purge_tags);
	}

Once this line is added, an error log should be printed out every time something is purged. You can test this by pressing the purge front page button in the litespeed cache management page. Once confirmed, wait for the cron to activate, and check the error log – there should be new messages. We’re interested in what tags are purged.

Thanks,
Kevin

There are multiple possibilities, all depending on how your server was installed.
The first place to check is your where your wordpress’s index.php file is, so if it is at /home/user/public_html/index.php, look for /home/user/public_html/error_log.
Else you could have your own error log, /home/user/logs/error_log.
Else it could be at /usr/local/apache/logs/error_log or /usr/local/lsws/logs/error.log