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Difference between revisions of "Lustre Debugging for Developers"

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  #define DEBUG_SUBSYSTEM S_PORTALS
 
  #define DEBUG_SUBSYSTEM S_PORTALS
  
A list of available macros with descriptions is provided in see [http://wiki.lustre.org/manual/LustreManual18_HTML/LustreDebugging.html#50651266_pgfId-1291518 Section 24.2.8: ''Adding Debugging to the Lustre Source Code''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
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A list of available macros with descriptions is provided in see [http://wiki.lustre.org/manual/LustreManual20_HTML/LustreDebugging.html#50438274_pgfId-1296027 Section 28.3.1: ''Adding Debugging to the Lustre Source Code''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
  
 
== Accessing a ''ptlrpc'' Request History ==
 
== 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.
 
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 [http://wiki.lustre.org/manual/LustreManual18_HTML/LustreDebugging.html#50651266_pgfId-1291584 Section 24.5: ''Ptlrpc Request History''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
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For more information about how to use ''prlrpc'', see [http://wiki.lustre.org/manual/LustreManual20_HTML/LustreDebugging.html#50438274_pgfId-1296100 Section 28.3.2: ''Accessing a Ptlrpc Request History''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
  
 
=Finding memory leaks using ''leak_finder.pl''=
 
=Finding memory leaks using ''leak_finder.pl''=
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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.   
 
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 [http://wiki.lustre.org/manual/LustreManual18_HTML/LustreDebugging.html#50651266_pgfId-1291477 Section 24.2.4: ''Finding Memory Leaks''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
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For details, see [http://wiki.lustre.org/manual/LustreManual20_HTML/LustreDebugging.html#50438274_pgfId-1296154 Section 28.3.3: ''Finding Memory Leaks Using leak_finder.pl''] in the [http://wiki.lustre.org/manual/LustreManual20_HTML/index.html ''Lustre Operations Manual''].
  
 
=Using LWT Tracing=
 
=Using LWT Tracing=

Latest revision as of 07:18, 20 January 2011

(Updated: Jan 2011)

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:

#define DEBUG_SUBSYSTEM S_PORTALS

A list of available macros with descriptions is provided in see Section 28.3.1: 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 28.3.2: Accessing a Ptlrpc Request History in the Lustre Operations Manual.

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 28.3.3: Finding Memory Leaks Using leak_finder.pl in the Lustre Operations Manual.

Using LWT Tracing

Lustre offers a lightweight tracing facility called LWT. It prints fixed size requests into a buffer and is much faster than LDEBUG. The LWT tracking facility can be used to debug difficult problems. Use of LWT tracing requires rebuilding LNET code.

Dumped LWT trace-based records contain:

  • Current CPU
  • Process counter
  • Pointer to file
  • Pointer to line in the file
  • Four void * pointers

An lctl command can be used to dump the logs to files.