>
> All my tracks, hiking, car & cycle, are 1 second interval, & I
> frequently deal with multiple tracks created during the course of a
> days cycling or walking.
>
> The majority of my tracks are created by a Garmin Oregon 300. When I
> load the tracks (generally using file / append) my laptop screen dims &
> everything freezes for several seconds, but always recovers. If there
After loading each individual gpx file, Viking generates a redraw at the view
to see all of that gpx.
This means if there's a map layer present it will load/download tiles
for that view too (reading lots map tiles from disk times a little time)
At present it's not clever enough to only do the redraw when the last gpx is
opened.
This should be simple to generate the code improvement.
> are several tracks with many waypoints the programme may become slower
^^^^^^^^^^
Using many waypoints* will slow Viking down as it's written using the
traditional (i.e. slow Gdk API graphics functions)**.
But there is a workaround by adjusting the TrackWaypoint Layer Properties,
Waypoints tab:
1. Turn off 'Draw Labels'
- This seems to make the biggest difference as drawing text to the viewport is
slow (especially when panning the screen around)
2. Turn off 'Draw Waypoint Symbols'***
* Interestingly only just discovered this - helped by using some 1000 Waypoint
gpxs.
I use Viking with massive tracklogs, so I don't really notice this issue.
Behaviour is worse on my laptop then the desktop, presumably since the laptop
is of a lower spec.
** Rewriting Viking to use cairo / champlain for the main view is a
possibility .... but don't hold your breath for this little volunteer
project.
*** There might be a way for this to scale up better, however the main
slow down is in point 1, so IMHO there's not much incentive to attempt
to address this.
> but still functions. However, I need to save the file at an early
> stage, and then keep saving at regular intervals as I edit the tracks,
> combining them, removing duplicates, and uploading them to OSM etc. If
> I don't regularly save the whole laptop will freeze and not recover,
> necessitating holding the power button for a few seconds to switch it
> off, and then starting again. I don't have evidence of this, but
> creating a track/route seems to use even more resources, so my laptop
> may crash more often - again frequent saving stops this.
The whole laptop freezing seems a symptom of allocation vast amounts of memory
and the system locks up. Eventually the OOM Killer may kick in a removes a
lucky program. I don't think there are any severe memory leaks or memory
allocations in Viking (other then DEMs) ....
The only cause I know of in Viking is opening *lots* of DEMs (i.e. over 50 or
more).
Redrawing with DEMs is also very slow as they recalculate every point on
display.
For using DEMs (this is how I do it:), is to load them in for your area - my
machine copes with coverage of the UK for example *but keep the layer
invisible*.
Since you probably have OSM tiles for map view anyway, the DEMs don't need to
be visible but they'll still be used the other DEM functionality: the cursor
height readout, track creation and track property elevation display.
> It may be that a feature that regularly saves to disk at 2 minute
> intervals would alleviate this?
This maybe something to add.
> I hasten to add, this is not a complaint - you asked, so I'm answering.
> I'm a long term fan of viking & recommend it to friends. I also think
> that Ubuntu may be partially to blame here, as the performance of the
> laptops seems to have reduced over the last 2 versions of Ubuntu. It's
> difficult for me to say if other programmes can cause similar effects,
> but I do know that 'Evolution' the PIM programme is resource heavy and
> can slow my system causing similar problems. I think the problems
> partially depend on the other programmes running - Thunderbird causes
> less problems than Evolution, Chromium causes less problems than
> Firefox.
I'm glad you're a fan.
> My computer is a laptop, Intel(R) Core(TM)2 CPU T7200 @ 2.00GHz with
> 4GB of ram, running Ubuntu 11.10 (can also boot into windows 7, where
> there is a version of Viking as well, but I rarely do this & don't know
Your laptop seems well specc'ed especially with 4GB RAM.
NB All my machines are single core efforts.
I wouldn't have thought multi core machines would effect Viking negatively.
May be you could try on a single core machine and see how that compares?
Rob. (OSM user robbieonsea)
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