Hi,
Our app was running well on Tomcat 7 on linux. Recently we migrated to
Tomcat 8 on linux. However we found the system CPU usage is higher than
normal. When there is no any user interaction, we still see about 25% of
the system CPU usage. After deep dive, we found the tomcat keeps scanning
our app's class path under WEB-INF folder. Actually all our artifacts are
packed within WEB-INF/lib folder, there is nothing within WEB-INF/classes
folder. Is there any way to look for WEB-INF/lib folder first before
looking for artifacts within WEB-INF/classes folder?
Also why does Tomcat keeps scanning our app classpath during app idle time?
Is there anyway to turn this off?
The detailed information is shown as below for your references.
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/org",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/org",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/org",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/org",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/com",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin", {st_mode=S_IFDIR|0700, st_size=4096, ...}) =
0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24", {st_mode=S_IFDIR|0700,
st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196 lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes",
{st_mode=S_IFDIR|0700, st_size=4096, ...}) = 0
7196
lstat("/home/jgu-admin/apache-tomcat-8.0.24/webapps/IDManager/WEB-INF/classes/com",
0x2b9a564eb2b0) = -1 ENOENT (No such file or directory)
7196 lstat("/home", {st_mode=S_IFDIR|0755, st_size=4096, ...}) = 0
Thanks,
Jennifer
