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Re: [sumo-user] statistics output & summary output
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(please forward a few lines below for my remarks)
Am 14.03.2022, 10:18 Uhr, schrieb Jakob Erdmann <namdre.sumo@xxxxxxxxx>:
> Therefore I point out mor clearly that without using the -c command line
option, no summary is generated. At the moment I cannot say whether
this condition also applies to statistics output, since I did the tests
on my office computer.
I'm pretty sure that this is working in our test. Please post the exact command that doesn't behave as expected.
$ sumo-gui --statistic-output "output/stats.xml" --summary output/summary.xml &
With this command, only edgedata.xml is generated (right from the start, just after having loaded the sumocfg file from the file menu. Note that edgedata.xml is specified via an include of an additional-misc.xml file with following contents:
<additional>
<edgeData id="full" file="output/edgedata.xml"/>
</additional>
Of course, edgedata.xml is also generated when sumo-gui is not started from the command line.
The report-section of the sumocfg file contains this:
<verbose value="true"/>
<duration-log.statistics value="true"/>
<no-step-log value="true"/>
Therefore I'd expect that a statistics output is generated. But I think that a missing statistic-output argument makes that this is not the case. Therefore I was using the commandline interface, hence the --statistic-output in the quoted command line above.
When I invoke this...
$ sumo-gui -c osm.sumocfg --statistic-output "output/stats.xml" --summary output/summary.xml &
... both stats.xml as well as summary.xml are created right after the start (initially only containing the header).
Hence, indeed the statistics output is generated only when specifying the osmcfg file via the command line.
Tested with 1.12.0 and also with 1.12.0+1158.
At any case: only when a file is present with header content after loading the simulation, the file will grow (summary) during or show content (edgedata, stats) after a simulation ends: there will by no output file when it it not present from the start. This allows very quick determination of behaviour without actually starting the simulation.
Regards,
Rob
> Regarding buildup of summary data in memory
Summary output size grows linear with simulation duration and would therefore function as a "memory leak" in long-running simulations if not flushed to disk. In contrast, statistic-output uses a fixed amount of memory since it only accumulates in a constant number of variables.
Jakob,
perhaps I was a bit misunderstanding. Therefore I point out mor clearly that without using the -c command line option, no summary is generated. At the moment I cannot say whether this condition also applies to statistics output, since I did the tests on my office computer.
Regarding buildup of summary data in memory (array) or disk: Well, let me compare with statistics output. This is something that IS build up into memory and is flushed into the file at the very moment of closing the final simulation end dialog with "yes" (closing view & files). Whether it's only flushing the file output buffer or outputting a data structure at that time is secondary.
Regards,
Rob
The documentation already says "The elements vehicleTripStatistics, pedestrianStatistics, rideStatistics and transportStatistics are only generated when either of the options
--duration-log.statistics or --tripinfo-output are set."
I've now put this into a yellow box to make it more visible.
Note: the reason why this isn't on by default is because the additional bookkeeping required by this feature can slow down the simulation.
> I'd suggest to accumulate the summary in memory and output it at once to file, because this wouldn't slow down simulation.
I'm not sure I understood the suggestion. Do you propose that accumulating in memory would bring a speedup or that it would bring some other benefit (without slowing down the simulation)?
best regards,
Jakob
