Default FD buffer size is not a power of 2
From https://hackage.haskell.org/package/base-4.9.1.0/docs/src/GHC.IO.FD.html
-- We used to use System.Posix.Internals.dEFAULT_BUFFER_SIZE, which is
-- taken from the value of BUFSIZ on the current platform. This value
-- varies too much though: it is 512 on Windows, 1024 on OS X and 8192
-- on Linux. So let's just use a decent size on every platform:
dEFAULT_FD_BUFFER_SIZE :: Int
dEFAULT_FD_BUFFER_SIZE = 80968096 is not a power of two, and does not agree with the original commit message that sets it to 8KB (https://github.com/ghc/ghc/blame/master/libraries/base/GHC/IO/FD.hs#L119).
Confirmed by Simon Marlow on IRC that this is a typo, a mix between 8192 and 4096.
I'll send a patch to set it to 8192.
It would be nice if the fix could be released in both GHC 8.2 and and 8.0.3.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 8.0.2 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Runtime System |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | nh2, simonmar |
| Operating system | |
| Architecture |