[GHC] #16190: Speed up handling of large String literals

[GHC]

#16190: Speed up handling of large String literals
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        Reporter:  hsyl20            |                Owner:  (none)
            Type:  task              |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.6.3
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:
                                     |  Unknown/Multiple
 Type of failure:  None/Unknown      |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by hsyl20):

 > What does "no optimisation" and "threshold 100" mean? I though if
 "threshold 100" means that if a literal is > 100 bytes then it is put in
 the extra file, then every single line will do that, so the threshold is
 irrelevant.

 Indeed with threshold=100 the optimization applies in every tested case to
 the string literal in the file. I could have written "optimization enable"
 but then we would have wondered what the threshold was (in particular if
 the optimization was triggered for small strings).

 > I wonder why it every slows down? Just the extra file handling?

 I guess it's extra file handling (generation and linking) + the traversal
 of the module bindings. With the small strings, this test seems to be
 consistently worse with the optimization enabled (i.e. it's not just
 measure noise).

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/16190#comment:5>
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