one other tidbit here: we don't cache zinc increme...
# generalw
witty-crayon-22786
03/05/2018, 4:55 PMone other tidbit here: we don't cache zinc incremental compiles
witty-crayon-22786
03/05/2018, 4:59 PM@polite-vase-75369: it's possible this is tied in to what you're seeing; but unknown. see the
--compile-zinc-incrementalp
polite-vase-75369
03/05/2018, 5:00 PMwhat should i try setting it to?
w
witty-crayon-22786
03/05/2018, 5:01 PMleave it where it is. would just suggest reading the docs on that setting and the
--compile-zinc-incremental-cachingwitty-crayon-22786
03/05/2018, 5:02 PMfind in page for
-incrementalwitty-crayon-22786
03/05/2018, 5:02 PM Copy code
--[no-]compile-zinc-incremental (default: True)
When set, zinc will use sub-target incremental compilation, which dramatically improves compile performance while changing large targets. When unset, changed targets will be compiled with an empty output directory, as if after running clean-all.
--[no-]compile-zinc-incremental-caching (default: False)
When set, the results of incremental compiles will be written to the cache. This is unset by default, because it is generally a good precaution to cache only clean/cold builds.p
polite-vase-75369
03/05/2018, 5:03 PMah fascinating
w
witty-crayon-22786
03/05/2018, 5:05 PMso it's a good idea to set
--no-compile-zinc-incrementalwitty-crayon-22786
03/05/2018, 5:06 PMalso "generally a good precaution" is too soft... basically: zinc is still riddled with bugs
p
polite-vase-75369
03/05/2018, 5:22 PMhah so this might be bad to enable?
w
witty-crayon-22786
03/05/2018, 5:22 PM--compile-zinc-incremental-cachingwitty-crayon-22786
03/05/2018, 5:23 PMbasically, any of the zinc bugs under https://github.com/pantsbuild/pants/labels/jvm would be liable to be written to the cache
witty-crayon-22786
03/05/2018, 5:23 PMand then you'd have to wipe the cache
witty-crayon-22786
03/05/2018, 5:24 PMwe've been about 2 years "need to wipe the cache to fix an issue" free.
p
polite-vase-75369
03/05/2018, 5:26 PMso enabling incremental "fixed the problem" for me, but i dont get why it wont just cache after a compile finishes?
w
witty-crayon-22786
03/05/2018, 5:27 PMsorry, which setting?
p
polite-vase-75369
03/05/2018, 5:27 PM--compile-zinc-incremental-cachingw
witty-crayon-22786
03/05/2018, 5:27 PMyea, that one is scary. would not recommend it.
p
polite-vase-75369
03/05/2018, 5:28 PMso how can i go about getting cacheing to work when i do a pants run?
w
witty-crayon-22786
03/05/2018, 5:28 PMthe cache writing happens in a background thread, and it starts before compile finishes.
witty-crayon-22786
03/05/2018, 5:29 PM@polite-vase-75369: generally, doing clean builds in CI is a good way to populate the cache (by setting
--no-compile-zinc-incrementalwitty-crayon-22786
03/05/2018, 5:29 PM...without also waiting for clean builds locally
p
polite-vase-75369
03/05/2018, 5:30 PMhmmm
polite-vase-75369
03/05/2018, 5:30 PMbut now even when i compile locally i dont see it populating the cache
polite-vase-75369
03/05/2018, 5:30 PMnot doing run, doing compile
polite-vase-75369
03/05/2018, 5:30 PMhave i screwed up a setting somehow?
w
witty-crayon-22786
03/05/2018, 5:31 PMread the help strings again
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