cache: add tracing to prune #5627
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The prune logic would prune multiple times because one prune could cause more things to be capable of pruning and change the logic. This was done through a recursive invocation. Since go doesn't have support for function tail calls, this would result in a new stack entry for each loop. This unrolls the logic so the prune function is invoked iteratively rather than recursively. `prune` and `pruneOnce` have also had their names swapped. In general, `pruneOnce` implies that it runs a single prune while `prune` sounds like the top level function. The current code had this reversed and `pruneOnce` would call `prune` and `prune` would call itself recursively. I've also updated a section in the controller that invoked prune on each worker. In older versions of Go, the current version was correct because those versions of Go would reuse the location for each loop which would cause goroutines to all reference the same worker instead of different workers. Recent versions of Go have changed the behavior so this is no longer needed. Signed-off-by: Jonathan A. Sternberg <[email protected]>
Adds tracing to the cache manager prune operation. The attribute will show both explicit prunes from a user and background prunes initiated after solve requests are processed. Signed-off-by: Jonathan A. Sternberg <[email protected]>
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Adds tracing to the cache manager prune operation. The attribute will show both explicit prunes from a user and background prunes initiated after solve requests are processed.
The prune code has also been refactored a bit to remove a recursive call to prune. It has now been unrolled and the functions have been renamed so
prunestands for the entire prune process andpruneOnceis a single cycle. Previously,prunewas a single cycle andpruneOncewould run the entire prune cycle with a set of options.This also disabled the delve component of the
hack/composescript. It appears to be broken at the moment.