Server User Manual
Table Of Contents
- Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide
- Preface
- Overview of Enterprise Server Performance Tuning
- Tuning Your Application
- Java Programming Guidelines
- Java Server Page and Servlet Tuning
- EJB Performance Tuning
- Goals
- Monitoring EJB Components
- General Guidelines
- Using Local and Remote Interfaces
- Improving Performance of EJB Transactions
- Use Container-Managed Transactions
- Don’t Encompass User Input Time
- Identify Non-Transactional Methods
- Use TX_REQUIRED for Long Transaction Chains
- Use Lowest Cost Database Locking
- Use XA-Capable Data Sources Only When Needed
- Configure JDBC Resources as One-Phase Commit Resources
- Use the Least Expensive Transaction Attribute
- Using Special Techniques
- Tuning Tips for Specific Types of EJB Components
- JDBC and Database Access
- Tuning Message-Driven Beans
- Tuning the Enterprise Server
- Deployment Settings
- Logger Settings
- Web Container Settings
- EJB Container Settings
- Java Message Service Settings
- Transaction Service Settings
- HTTP Service Settings
- ORB Settings
- Thread Pool Settings
- Resources
- Tuning the Java Runtime System
- Tuning the Operating System and Platform
- Tuning for High-Availability
- Index
Tuning for Linux platforms
To tune for maximum performance on Linux, you need to make adjustments to the following:
■
“File Descriptors” on page 100
■
“Virtual Memory” on page 101
■
“Network Interface” on page 102
■
“Disk I/O Settings” on page 102
■
“TCP/IP Settings” on page 102
File Descriptors
You may need to increase the number of le descriptors from the default. Having a higher
number of le descriptors ensures that the server can open sockets under high load and not
abort requests coming in from clients.
Start by checking system limits for le descriptors with this command:
cat /proc/sys/fs/file-max
8192
The current limit shown is 8192. To increase it to 65535, use the following command (as root):
echo "65535" > /proc/sys/fs/file-max
To make this value to survive a system reboot, add it to /etc/sysctl.conf and specify the
maximum number of open les permitted:
fs.file-max = 65535
Note: The parameter is not proc.sys.fs.file-max, as one might expect.
To list the available parameters that can be modied using sysctl:
sysctl -a
To load new values from the sysctl.conf le:
sysctl -p /etc/sysctl.conf
To check and modify limits per shell, use the following command:
limit
The output will look something like this:
Tuning for Linux platforms
Sun GlassFish Enterprise Server 2.1 Performance Tuning Guide • January 2009100