Fix #3408: lengthen the idle GC time to 5s for GHC/GHCi.

1 files changed, 4 insertions, 1 deletions

diff --git a/compiler/parser/hschooks.c b/compiler/parser/hschooks.c
index 7b091e84ac..4878021a8b 100644
--- a/compiler/parser/hschooks.c
+++ b/compiler/parser/hschooks.c
@@ -5,7 +5,6 @@ in instead of the defaults.
 */
 
 #include "Rts.h"
-#include "RtsFlags.h"
 
 #include "HsFFI.h"
 
@@ -22,6 +21,10 @@ defaultsHook (void)
     RtsFlags.GcFlags.maxStkSize         = 512*1024*1024 / sizeof(W_);
     RtsFlags.GcFlags.giveStats = COLLECT_GC_STATS;
     RtsFlags.GcFlags.statsFile = stderr;
+
+    // See #3408: the default idle GC time of 0.3s is too short on
+    // Windows where we receive console events once per second or so.
+    RtsFlags.GcFlags.idleGCDelayTime = 5*1000;
 }
 
 void