I am using a max. of 64 MB PHP memory.
I am getting stuck at about 2XXX pages at depth 3. Sometimes I get an error like "Out of memory (allocated 443285504)".
My settings for "Make a delay between requests, X seconds after each N requests:" is 3s every 50 requests. Maximum execution time = 0, Save the script state, every X seconds: = 30, Maximum pages: = 0, Maximum depth level: = 0,
I only selected the Yahoo sitemaps as the only additional sitemap to create. Don't understand how much resources this script is going to need to complete 1 sitemap generation run and how much it is going to need to update the sitemap daily for my site.