Marge Bot pushed to branch master at Glasgow Haskell Compiler / GHC

Commits:

• 161d3285
  by Teo Camarasu at 2026-03-26T03:56:18-04:00

  Revert "Set default eventlog-flush-interval to 5s"
  
  Flushing the eventlog forces a synchronisation of all the capabilities
  and there was a worry that this might lead to a performance cost for
  some highly parallel workloads.
  
  This reverts commit 66b96e2a591d8e3d60e74af3671344dfe4061cf2.
  

2 changed files:

• docs/users_guide/9.16.1-notes.rst
• rts/RtsFlags.c

Changes:

   kqueue). This first one, based on `poll()`, is merely intended to be

   portable.

-- The default for :rts-flag:`--eventlog-flush-interval=⟨seconds⟩` has changed from being disabled to being enabled with a flush inverval of 5 seconds.

-

 Cmm

 ~~~

     RtsFlags.TraceFlags.ticky         = false;

     RtsFlags.TraceFlags.trace_output  = NULL;

 #  if defined(THREADED_RTS)

-    RtsFlags.TraceFlags.eventlogFlushTime = SecondsToTime(5); // 5s

+    RtsFlags.TraceFlags.eventlogFlushTime = 0;

 #  endif

     RtsFlags.TraceFlags.nullWriter = false;

 #endif