Re: [Wikitech-l] Slower responses with multiple app servers

Some more data, in case anyone can help me figure this out... When running multiple app servers the request for `load.php?debug=false&lang=en&modules=startup&only=scripts&skin=vector` often was very long (10-30 seconds). So I did several requests for just this (not as part of a page request) on both single-app-server and double-app-server configurations and found no difference. The first request on each took a long time (assuming building cache), but subsequent requests all took an okay time (~1.7 seconds...not great but consistent across my setups). So it doesn't appear to be something about that particular request, but perhaps to do with the dynamics of multiple requests occurring? Scott Ananian mentioned that it may be a lock issue, but I haven't been able to find any info on this. Next I tried just loading the Main Page in both 1-app and 2-app setups, and pulled from the Apache logs the request time, whether it was app server 1 or 2, and the requested URL, and sorted it alphabetically (to make all the requests line up). A graph of the times is at [1]. Raw data can be found at [2]. It clearly shows that 5 of the 11 requests are significantly slower with 2 app servers. Can anyone help me with what might be going wrong, or how I could troubleshoot this? Thanks, James [1] https://gist.github.com/jamesmontalvo3/5adf207623454c9eff98e93152b431 08/raw/89e567e238696c3cfaa3fb5ff1d987fda4d9f24c/Comparison-of-Main-Page.png [2] https://gist.github.com/jamesmontalvo3/5adf207623454c9eff98e93152b431 08#file-comparison-of-main-page-md On Mon, Jun 12, 2017 at 7:40 PM, James Montalvo <jamesmontalvo3(a)gmail.com> wrote: