Re: [GHC] #14741: High-memory usage during compilation using Template Haskell

#14741: High-memory usage during compilation using Template Haskell -------------------------------------+------------------------------------- Reporter: donatello | Owner: sighingnow Type: bug | Status: patch Priority: normal | Milestone: Component: Compiler | Version: 8.6.4 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple performance bug | Test Case: Blocked By: | Blocking: Related Tickets: #16190 | Differential Rev(s): Phab:D4384, Wiki Page: | https://gitlab.haskell.org/ghc/ghc/merge_requests/141 -------------------------------------+------------------------------------- Comment (by Marge Bot ): In [changeset:"224a6b864c6aa0d851fcbf79469e5702b1116dbc/ghc" 224a6b86/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="224a6b864c6aa0d851fcbf79469e5702b1116dbc" TH: support raw bytes literals (#14741) GHC represents String literals as ByteString internally for efficiency reasons. However, until now it wasn't possible to efficiently create large string literals with TH (e.g. to embed a file in a binary, cf #14741): TH code had to unpack the bytes into a [Word8] that GHC then had to re- pack into a ByteString. This patch adds the possibility to efficiently create a "string" literal from raw bytes. We get the following compile times for different sizes of TH created literals: || Size || Before || After || Gain || || 30K || 2.307s || 2.299 || 0% || || 3M || 3.073s || 2.400s || 21% || || 30M || 8.517s || 3.390s || 60% || Ticket #14741 can be fixed if the original code uses this new TH feature. }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14741#comment:21 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler