Is it possible to view the time delta between each line?

[lheinold]

Is your feature request related to a problem? Please describe.
I know how to get the time delta from the beginning of the file or from a marked line (shift+t) but is there a way to show the delta between each line? So if messages were being printed every second (for example), the time delta would show 1s, 1s, 1s, 1s instead of 1s, 2s, 3s, 4s.

Describe the solution you'd like
A way to switch from cumulative time delta to time delta from the previous line.

Describe alternatives you've considered
While the current feature (shift+t) does show the same information, it is not as easy (for me) to understand.

Additional context
N/A

[tstack]

Can you explain what you're trying to do/how it would be used?

The data is not shown in the log view now, but it is available when querying the log tables with SQL as the log_idle_msecs column. Would that satisfy your ultimate use case?

[lheinold]

Basically, the software I'm debugging is going much slower than usual and log statements that are usually .001s apart or less are .02s+. I am trying to write up a description of the issue and want to be able to put something like "log statements are anywhere from x ms to y ms apart, averaging around z ms". I can get this information from the "shift+t" option and using a calculator but I am lazy (lol).

I have not really worked with the SQL log tables but it does sound like that could satisfy my use case. I'll look into it, thanks!

[haydenflinner]

This would be super useful for further derivations from the timestamps. Like, this log I usually see every 5 seconds, but starting at this time, I saw it only every 6 or 7 seconds..Could do a histogram on the distribution of the deltas of repeating log lines

[unhammer]

Deltas would be very useful! However, I was able to get something good enough for me with

lnav  -n \
        -c ';SELECT log_text from generic_log WHERE log_idle_msecs > 100' 
        -c ':write-raw-to -'  \
        my.log \
   | lnav

[trapier]

For anyone looking to see delta time adjacent to displayed log messages, this did the trick for me:

;SELECT log_idle_msecs, log_text from logline

Query results have all filters applied whether or not those filters are enabled. Not sure if this is expected or not. Version 0.12.4.

[tstack]

... this did the trick for me:

;SELECT log_idle_msecs, log_text from logline

Note that the logline table will only return results for messages that have the same "textual format".

You probably want to use the all_logs table, which returns all log messages that are displayed in the "LOG" view.

;SELECT log_idle_msecs, log_text FROM all_logs

[FaffeF]

could be a nice addition to the T "elapsed time" column? Toggle through none/absolute/relative log message times?