[[Property:title|Record execution]]
[[Property:weight|1]]
[[Property:uuid|1255beef-e115-b8ae-87f6-08e267fe3d8f]]
For performance reason, the recording mechanism has a few parameters. For now there is no way to change them easily with the graphical debugger, however you can change those parameters by editing (and recompiling) <code>{RT_DBG_EXECUTION_PARAMETERS}.make</code>. 
* <code>{RT_DBG_EXECUTION_PARAMETERS}.maximum_record_count</code>
** Type: <code>INTEGER</code>
** Default value: 1_000_000
** Effect: The recording keeps only the last <code>maximum_record_count</code> object's records.
* <code>{RT_DBG_EXECUTION_PARAMETERS}.flatten_when_closing</code>
** Type: <code>BOOLEAN</code>
** Default value: <code>True</code> 
** Effect: When leaving a feature, the recorder flattens the associated record. This saves memory space, and optimizes the underlying mechanism. The default value of <code>True</code> is recommended.
* <code>{RT_DBG_EXECUTION_PARAMETERS}.keep_calls_records</code>
** Type: <code>BOOLEAN</code>
** Default value: <code>True</code>
** Effect: When flattening call records' values, keep the sub-call records (i.e: the execution calls history)
* <code>{RT_DBG_EXECUTION_PARAMETERS}.recording_values</code>
** Type: <code>BOOLEAN</code>
** Default value: <code>True</code>
** Effect: During execution, record attribute and locals assignment. Set to <code>False</code> if you just want to review the calls history. Values will not be recorded, but recording will be faster.


{{warning|Since there is no way to restore local values when the execution left the related call stack frame, the recording discards the recorded local values.}}


The recording functionality is graphically available on the Call stack tool, or though the "Execution" menu (formerly the "Debug" menu).

After you start debugging, if at some point you decide to start recording, click on the "record" button in the Call stack tool:


[[Image:exec-replay-00]]


or follow the menu path: 
<code lang=text>
Execution --> Activate Execution Recording</code>


{{note|If you want to record from the beginning, just enable the recording before starting the debug session (the recording button is a toggle button)}}


{{tip|You can also use the "When hits.." actions of [[Breakpoint editing|breakpoints]]  to start and stop the execution recording. This can be useful to record only the part of an execution that you are interested in.}}


[[Image:exec-replay-00-1]]


The execution is now recorded. Whenever the application is stopped, you can decide to [[Replay (recorded) execution|replay]] the previously recorded execution. See: [[Replay (recorded) execution]] to learn how to replay an execution.


{{note|EiffelStudio provides record and replay only in classic mode. So, it is not yet supported for .NET systems.}}