chewiebug
Wrong graph display when open series
Hello,
My GC logs are configured with a rotation based on the size.
When I restart the JVM it creates a new one and keep the old ones.
If I open my gc logs as a series, the display of the graph is totally crazy.
It looks like the parsing of the different files has a problem and don't understand there has been a break beetween the logs.
Thank you for your feedback.
gc_logs.zip
I think I found the reason.
The GC(*) index is reset to 0 when the JVM restart
and the time from start too...
Hi
I don't think it has to do with the GC(*) index. It is used during parsing to keep lines together that are part of the same gc event. But they are not used for rendering.
I suspect it is related to the order of the files during parsing. If a file with later timestamps is parsed first and one with earlier timestamps later, then the graph is corrupt, because the events are not ordered by timestamp. I don't remember the ordering criteria during parsing any more, but I remember some discussion around the subject.
A solution would probably need to order the files by timestamp (maybe filetimestamp would be enough) or make the internal list of events ordered by timestamp. The latter is not always possible, because the logs may not contain timestamps, but simply durations since startup. So it would probably have to involve (better?) ordering of the files during parsing.
I see, that GcSeriesLoader#determineStartTimePerGcModel() tries to do some ordering. Maybe that logic is broken.
Best regards Jörg
I made some tests on my side and I'm pretty sure the durations since startup is used to determined the timeline