Lustre Debugging for Developers

The procedures below may be useful to developers debugging Lustre code.

Adding Debugging to the Source Code
The debug infrastructure provides a number of macros that can be used in Lustre™ source code to aid in debugging or reporting serious errors.

To use these macros, you will need to set the DEBUG_SUBSYSTEM variable at the top of the file to as shown below:


 * 1) define DEBUG_SUBSYSTEM S_PORTALS

A list of available macros with descriptions is provided in see Section 23.2.8: Adding Debugging to the Lustre Source Code in the Lustre Operations Manual.

Accessing a ptlrpc Request History
Each service maintains a request history, which can be useful for first occurrence troubleshooting. Prlrpc is an RPC protocol layered on LNET. This protocol deals with stateful servers and has semantics and built in support for recovery. Prlrpc is a subsystem in the Lustre Debug Messages section.

For more information about how to use prlrpc, see Section 23.5: Ptlrpc Request History in the Lustre Operations Manual.

Using lightweight tracing (LWT) for debugging
Lustre offers a lightweight tracing facility called LWT that can be useful for debugging difficult problems. It prints fixed size requests into a buffer and is much faster than LDEBUG.

LWT trace-based records that are dumped contain:
 * Current CPU
 * Process counter
 * Pointer to file
 * Pointer to line in the file
 * Four void * pointers

An lctl command dumps the logs to files.

How is LWT used?

=Finding memory leaks using leak_finder.pl=

Memory leaks can occur in code when memory has been allocated and then not freed once it is no longer required. The leak_finder.pl program provides a way to find memory leaks.

For details, see Section 23.2.4: Finding Memory Leaks in the Lustre Operations Manual.