On Sat, 08 Nov 2014 15:45:30 -0800 Zac Medico wrote: > On 11/08/2014 03:33 PM, Patrick Lauer wrote: > > We can choose for "code that works reasonably fast" - portage hasn't > > gotten any noticeable work on performance in a while, and people have > > just piled on more and more features and complexity. > > Yes, as one of only 2 people who have worked on the resolver in recent > history, I agree with your statement. There have been lots of features > added (including EAPI 5 sub-slot rebuilds), with not much thought to > performance tuning. It will be interesting to do some profiling and see > what we can improve. > > > There's no reason that it takes a minute to start up, > > If it takes a minute then it probably means that > /var/cache/edb/vdb_metadata.pickle got deleted. In that case, it has to > reload lots of metadata from /var/db/pkg/*/*/*.
On old hardware it may take dozens of minutes of CPU time. I have that *.pickle files, I have sqlite metadata cache, I have 100% CPU usage. It's not an I/O problem. Just take into account that due to instruction set, Lx cache, frequency and memory speed difference old CPU-based system may be 20x times slower than recent one. Best regards, Andrew Savchenko
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