[WIP, Investigation] Cache project options #2801
Conversation
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How does this work on the dense solution? |
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@saul
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dotTrace on this PR (that 15% CPU load)
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Looks like
That's after I've made the cache here https://github.com/Microsoft/visualfsharp/blob/master/src/fsharp/vs/IncrementalBuild.fs#L1671 global, like static let cache = TimeStampCache(defaultTimeStamp) (it's obviously must be invalidated on file changes (watcher?), but it's not the point here) |
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That looks a lot better, thanks for investigating this. I think AreSameForChecking doesn't need to be recursive, though. Maybe remove the recursion and see what the performance is like? |
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@saul With no recursion it was loading CPU at 15% for about 4 minutes, then dropped to zero. I'm not sure we can remove recursion there because if a referenced project changed, we won't know that and project options becomes outdated. |
There's surely got to be a better way of doing these comparisons (e.g. making the project options type abstract and giving the values a unique stamp, or a SHA1 hash, then just comparing stamps/hashes) |
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Any closing thoughts @vasily-kirichenko ? |
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@saul no. I think I'm not going to touch project system in near future. Let's wait until MS port it to CPS (no sarcasm, I'm just tired with this stuff). |
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Fair enough - as this is in the language service though I don't think CPS will help us here. |
It caches
FSharpProjectOptionsand it won't work if projects changed. The log shows the following:So, yes, there is lot redundant work, but all these are done in about 2 seconds, so...