-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 Daniel,
On 2/24/15 8:01 AM, Daniel Mikusa wrote: > On Tue, Feb 24, 2015 at 7:33 AM, Peter Irbizon > <peterirbi...@gmail.com> wrote: > >> Hello, I would like to know if it is normal that tomcat7 runs on >> 3.9% CPU when idle? I saw all other processes are at 0%, only >> tomcat7 is always at least 3.9%. >> > > 1.) What's your system like? How many CPUs / cores? Is it a VM or > hardware? What is the specific version of Tomcat? of Java? What > OS are you running? > > 2.) How are you determining it's idle? As John mention, do you > have any apps deployed? Do you know if traffic is hitting the > server? > > 3.) Can you run a profiler and attach it to Tomcat? It'll tell > you what's happening inside the JVM. 4. Take a few thread dumps to see what the JVM threads are doing. When truly idle (i.e. no requests are being processed), Tomcat runs a maintenance thread that performs some background tasks, but that runs about once every 60 seconds and does very little, depending on what you have configured. So unless you are seeing that thread specifically running at its interval, Tomcat's threads are totally blocked waiting on various events to occur (like an I/O event for an incoming request, or waiting for a timeout to perform that maintenance). On a dev server, I just checked and my Tomcat processes go down to 0.0 CPU as measured by top when they aren't "doing" anything. The thread dumps will likely tell the story. - -chris -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 Comment: GPGTools - http://gpgtools.org iQIcBAEBCAAGBQJU7JXcAAoJEBzwKT+lPKRYbpoP/iEYzgNjKkAXyvo907sJe6vY 0gVe3qLlZiuQGQLnlXHxTOTP701+IxK+3TzQN6jO2+dCNAZkJvup+xOzRLUavHk2 fNMYUgsPdCugg9S64Vfx7Mmo7Id9zX9UZ49yg+cwWAp7OAYaGfB6QIY/ux6C0zxB /ELOjGvyE1gHrenhovtVptze4JBBOzpsa2AMl1bnz4mtfVk5p8+21VI7u5e3gfRU 4lE5tNsjekWXnxUVwg4FNzDuIY2KP2Wqq7sNE6QSKhoIltuT+DB0g8u71ARQzkJH atMNuu7lG0auZqUQRhUxtCJ/6DIshHNxKlhCT91AjF9Mc3rdNSadTd7/j3DslCcL 0TnhdznXPou5LJgYNmdW4AVD6FQqxEf+0JW7o8jq4bbJ3NYlDVjhFoFMskN7IsOD h6uDzvS3nLrYuKJjsBNQWBRloMNtiy/fIa37AZeXrl81CubSgDPO3kYJs3fzjs9j srLvGEoctaHHA8N6ZWI+PL4r2vgLhu5iRY4Hh6OHHQ8zpnzKO1vWbqw0oFD44TQ6 tnuPyEwclm44tdAonAxmAyRLxpACVdjBp2hMbZq8YvcetCi/XvuRs3nhp5NpIZnE QHxEk2BpCGWoQxGTkLuEtj+vf/EwqAUyk+qLXV04lo29KcO4maxh4HYYViM/rSgb rC5Fm3UhC3vhkxwRE8/e =Wts6 -----END PGP SIGNATURE----- --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
