Mark, On Mon, 18 Nov 2019 at 19:28, Mark Thomas <ma...@apache.org> wrote:
> 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. > > Thanks for Debugging this. Are you saying that we will have a patch for this? If so, which jar could we replace in 8.5.45 until we move to new tomcat? Thanks, > Mark > > --------------------------------------------------------------------- > To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org > For additional commands, e-mail: users-h...@tomcat.apache.org > >
