So how do you know a process has crashed then? Because of the 25% CPU usage? Are you certain that it's not a legitimate thing it's doing? Have you let it go for an hour or two to see what happens?
And you don't need to erase Aperture every single time. Install OS, install Aperture and your library. Run Aperture and look for your odd CPU usage. If none, install next app. Look again. Install next app and look again.....
And you think this is a long process? Try doing this on a Windows system!
Well, it may not be apps. It could be a rogue preference file. It could be a corrupt library. The reason it would take a long time is that my library is 600 GB. reinstalling it from a backup to troubleshoot would take forever - and yes, I have to reinstall the Aperture Library every time to be consistent - as it's the thumbnail rebuild that shows the issue after a few hours (again this adds to the trouble shoot time). I guess technically, I COULD just delete thumbnails, but you know, to be properly consistent.
ie - Clean install of OS X - 3-4 hours (internet connection not the best) - reinstall Aperture and Library 3-4 hours. Let thumb nails build until it "hangs" - 2-3 hours.
Then add new test-addition - then either reinstall aperture library and let thumnails build again, etc etc.
It's not like it's a small library, with a few minutes of building to see the hang.
At any rate, I reinstalled OS X and Aperture, and it was BETTER, but not fixed. It happened less frequently, and allowed me to just brute force the rebuild. the "hang" ONLY happened during thumbnail rebuilds.
No, I didn't let it go for several hours, but probably for an hour at least. The weird thing was that it was a SYSTEM thing, but no associated process. I posted this on an Aperture-related board, and one person chimed in and said they've seen the same thing, so that would suggest a software bug (again I haven't done a large thumbnail rebuild on Mavericks an the latest Aperture).
That's not right and that doesn't sound like a hardware issue. Back up your data and go with a clean install as xraydoc stated. I use Aperture and my rMBP does not lock up at all when using it.
If I force quit any apps including aperture, I can restarted them fairly quickly. Time to reinstall OSX to see if that corrects the issue.
Aperture doesn't lock up when I'm using it. It locks up during thumbnail rebuilding. 50,000 thumbnails, it gets through a few thousand with a user process (green) then just stops, and a red process (belongs to system) uses exactly 25% and just sits there, even if I force quit Aperture.
I know it's not normal, I was mostly just curious if anyone else has seen this to get an idea if it's unique to my setup or just a rare instance. It helps to troubleshoot before going on an epic journey to bit-by-bit test.
I simply don't have the time to spend on piecing together my system from scratch, unless it gives me a really good lead to where the issue is. I know the very basic step to take would be clean install and add just the library - that would tell me if it's a library and/or software issue. But yeah, it's already several days for my system to be rebuilt if I'm working as best I can, let alone having to piece it together to test.
But like I said, I have brute forced the the thumbnail rebuild. No doubt there is SOME issue SOMEWHERE. at a guess I would say it's either the interaction with Mavericks and Aperture (a bug that only comes up in my particular instance i.e with my system configuration), or it's my Aperture Library itself (it has quirks since it has been built from early versions and simply ported) - I've been meaning to export it into a new library to start anew, but frankly, it's a case of "if it's not severely broken - don't fixt it", because it's such a huge library, any rebuild is not likely to go smoothly, and I'd need to check it properly to see if things move smoothly.
One day, when I have the time and inclination.
Thanks for the input, though, greatly appreciated.