splot does not handle overlapping events

[lkraider]

With this data:

2014-06-05 00:00:00.00 >process event1
2014-06-05 00:00:02.00 >process event2
2014-06-05 00:00:03.00 <process event2
2014-06-05 00:00:05.00 <process event1

By running:
splot -w 200 -h 100 -if splot-test.txt -o splot-test.png

Results in:

Notice that the event1 representation does not continue after event2 finishes, as it should.

[jkff]

splot currently does not support overlapping events on a single track.
A better way to understand how splot interprets your log would be this:

2014-06-05 00:00:00.00 >process green # start a green bar
2014-06-05 00:00:02.00 >process blue # forget that, start a blue bar instead
2014-06-05 00:00:03.00 <process blue # end the current bar, possibly overriding its color with blue
2014-06-05 00:00:05.00 <process green # end the current bar, possibly overriding its color with green

Can you elaborate on the use case where you want such behavior, and on the semantics you'd like to have in the general case?

[lkraider]

The idea is to have it graph a longer process, and inner markings to show specific parts of it. Example:

>process request
(do some initial work with data)
>process image (long running part of the worker)
<process image
>process wait (wait another process to finish)
<process wait
(do some other operations like db access)
<process request

So I want to see the overall request time, along with specific parts within it. Let me know if it makes sense within splot intended use case.

[jkff]

Sorry for the long delay. Yes, I think it makes sense, though I would
prefer to not change the existing semantics of > <. And anyway I won't have
time to work on it on the foreseeable future (but I'll be happy to review a
pull request).
The most generic yet easy-to-use thing I can come up with here is this:
allow overlapping tracks, specified by track@priority (higher priority is
drawn on top): e.g. you could have

process request
process@1 image
<process@1 image
process@1 wait
<process@1 wait
<process
etc.

In the meantime you can use colored text annotations for important events,
e.g. you could use:

process request
!process red [
!process red ]
!process blue [
!process blue ]

then you'll have "image" delimited by a red "[" and a red "]", and "wait"
by blue.

On Tue, Jun 10, 2014 at 2:31 PM, Paul Eipper notifications@github.com
wrote:

The idea is to have it graph a longer process, and inner markings to show
specific parts of it. Example:

process request (do some initial work with data)
process image (long running part of the worker)
<process image
process wait (wait another process to finish)
<process wait
(do some other operations like db access)
<process request

So I want to see the overall request time, along with specific parts
within it. Let me know if it makes sense within splot intended use case.

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Eugene Kirpichov
Google, distributed computing frameworks
http://www.linkedin.com/in/eugenekirpichov
http://jkff.info/software/timeplotters - my performance visualization tools