1. You got an OutofMemoryException,
now what?
Andres Olarte
Nick Rodriguez
4/16/10

2. Iden%fying
the
problem
 Memory
related
problems
 Performance
issues
 Stability
issues
 Frontend
vs.
backend
issues
 Tools
to
examine
the
system
 JMX
 Logs
4/16/10

3. Crea%ng
a
baseline
 Simula%ng
traffic
 Using
access
logs
as
test
base
 Examining
the
memory
usage
 Crea%ng
reproducible
tests
 Tools
for
the
job
 Comparing
results
4/16/10

4. Understanding
the
System
 Java
memory
management
 Garbage
collec%on
 Memory
u%liza%on
in
dotCMS
 Database
usage
in
dotCMS
 Common
boKlenecks
4/16/10

5. Memory
issues
 JVM
memory
configura%on
 Cache
configura%on
 Regions
and
their
sizes
 Time
to
live
 Per
request
memory
usage
 Per
session
memory
usage
4/16/10

6. Performance
issues
 Per
page
performance
 System-­‐wide
performance
 Garbage
collec%on
 hKp
vs
hKps
 Resource
u%liza%on
 Database
connec%ons
 Client
connec%ons
4/16/10

7. Best
prac%ces
 Assign
as
much
memory
as
possible
 Use
as
liKle
memory
as
possible
 Limit
the
amount
of
data
used
per
page
 If
benchmarking,
change
one
variable
at
a
%me
4/16/10

8. Thank you!!
4/16/10