Add caching for generated files

Question

Add caching for generated files

dergraaf opened this issue 5 years ago · comments

Files should not be regenerated if the configuration did not change.

Niklas Hauser · Answer 1 · Mon May 06 2019 05:39:30 GMT+0800 (China Standard Time)

I'm not sure how much time this will save tho. For reference, building node tree for lbuild discover for a large modm example takes ~0.7s, generating the the selected modules takes ~1.8s.

Ok, generating the whole library takes ~5s. Good point.

Niklas Hauser · Answer 2 · Mon May 06 2019 06:14:03 GMT+0800 (China Standard Time)

This needs to be super robust though. There is nothing worse than to start mistrusting lbuild because it didn't rebuild something.

Fabian Greif · Answer 3 · Mon May 06 2019 15:03:58 GMT+0800 (China Standard Time)

That is true. The solution I had in mind would actually not bring any speed-up (or only if we're IO write limited), but would instead allow to detect local changes by hashing/comparing the output before writing it to the output file. This would solve #19 as well.