...
| No Format |
|---|
export CATALINA_OPTS="-Xms256m -Xmx512m -Xloggc:/usr/local/tomcat4/logs/tomcat_gc.log" |
Example snipplet (your output may look different depending on JVM and options):
| No Format |
|---|
262274.805: [GC 256470K->242332K(260224K), 0.0389740 secs]
262286.923: [GC 258588K->242892K(260224K), 0.0208520 secs]
262299.466: [GC 259141K->245443K(261760K), 0.0377540 secs]
262299.504: [Full GC 245443K->69440K(261760K), 0.5614360 secs]
262303.010: [GC 85685K->70542K(260224K), 0.0092740 secs]
262303.191: [GC 86798K->71190K(260224K), 0.0160590 secs]
262317.124: [GC 87445K->73472K(260224K), 0.0302200 secs]
|
thread dump of the jvm
On Linux you can use the following to create a thread dump of all the running Java threads.
The thread dump will be written to Tomcat's catalina.out file.
This little script assumes you have only one process called java.
...
On Linux you can look at the load average and the CPU percent used using the top command.
If these are high Don't Panic and test how long it takes to load up a page in uPortal.
network connections
Network connections can help in diagnosing problems with database connection pools.
| No Format |
|---|
netstat -e >> file.out
|
Output example:
| No Format |
|---|
Active Internet connections (w/o servers)
Proto Recv-Q Send-Q Local Address Foreign Address State User Inode
tcp 0 0 portalsvr.foo.edu:48787 oraclesvr1.foo.edu:1521 ESTABLISHED tomcat 3065471
tcp 0 0 portalsvr.foo.edu:45708 oraclesvr2.foo.edu:1521 ESTABLISHED tomcat 3040316
tcp 0 0 portalsvr.foo.edu:45715 oraclesvr2.foo.edu:1521 ESTABLISHED tomcat 3040360
... snip...
|
memory usage reported by the OS
...