Unload once per linkable instead of once per splice #3390
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Dec 12, 2022
| @@ -160,8 +160,7 @@ computePackageDeps env pkg = do | |||
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| data TypecheckHelpers | |||
| = TypecheckHelpers | |||
| { getLinkablesToKeep :: !(IO (ModuleEnv UTCTime)) | |||
| , getLinkables :: !([NormalizedFilePath] -> IO [LinkableResult]) | |||
| { getLinkables :: !([NormalizedFilePath] -> IO [LinkableResult]) | |||
| @@ -1119,7 +1118,10 @@ getLinkableRule recorder = | |||
| -- Record the linkable so we know not to unload it | |||
| whenJust (hm_linkable =<< hmi) $ \(LM time mod _) -> do | |||
| compiledLinkables <- getCompiledLinkables <$> getIdeGlobalAction | |||
| liftIO $ void $ modifyVar' compiledLinkables $ \old -> extendModuleEnv old mod time | |||
| liftIO $ modifyVar compiledLinkables $ \old -> do | |||
| let !to_keep = extendModuleEnv old mod time | |||
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Surely some of the explanation you put in the PR description should be written in the code for future people?
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Sorry, forgot to include the file. I've updated it now.
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We need to unload old linkables before we can load in new linkables. However,
the
unloadfunction in the GHC API takes a list of linkables to keep (i.e.not unload). Earlier we
unloaded right before loading in new linkables, whichis effectively once per splice. This can be slow as
unloadneeds to walk overthe list of all loaded linkables, for each splice.
Instead, now we unload old linkables right after we generate a new linkable and
just before returning it to be loaded. This has a substantial effect on recompile
times as the number of loaded modules and splices increases.