On 18/11/2019 14:14, Mark Thomas wrote: > On 18/11/2019 12:06, M. Manna wrote: >> Mark and others, >> >> On Mon, 18 Nov 2019 at 12:01, Mark Thomas <ma...@apache.org> wrote: >> >>> OK, it looks like I can reproduce this. >>> >>> Steps to reproduce: >>> >>> - Windows 2016 Server fully patched >>> - Java 1.8.0u144 >>> - Install Tomcat 8.5.45 from windows installer >>> - Add tcnative-1.dll (64-bit) from Tomcat Native 1.2.23 >>> - Modify server.xml to use Http11AprProtocol on port 8080 >>> - Make a single request >>> >>> I then see 1 core running at 100% until the connection times out after >>> 20s. Make another request and a core goes back up to 100% for 20s (the >>> default keep-alive time out). >>> >> >> I have also successfully reproduced this with making a single request >> (sorry for not replying in the weekend). Not sure how your graph looked >> like, but the Jvisualvm showed me a Sinusoidal modulation curve as soon as >> the request hit the server. and it didn't go down at all. > > I see similar behaviour on Windows 7 but the the CPU usage drops after ~5s. > > A binary search indicates that the issue was introduced with this commit: > > https://github.com/apache/tomcat/commit/fffb08790e642e03f00c5f96a3a61ee09a2c8342 > > (this is for 9.0.x - 8.5.x and 7.0.x had similar commits) > > However, that code was removed when APR was switched to a single poll > set.
Ah ha. It was removed in 9.0.x but not in 8.5.x (only 9.0.x switched to a single Poller) so it does look like this change is responsible. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
