[Akonadi] [Bug 334218] synchronizations of large folders with filesystem contents hogs a Sandybridge core for minutes stat()ing every file in it

[Martin Steigerwald]

https://bugs.kde.org/show_bug.cgi?id=334218

--- Comment #5 from Martin Steigerwald <Martin at Lichtvoll.de> ---
Testing with:

diff --git a/resources/maildir/libmaildir/maildir.cpp
b/resources/maildir/libmaildir/maildir.cpp
index 9bd3802..36166ed 100644
--- a/resources/maildir/libmaildir/maildir.cpp
+++ b/resources/maildir/libmaildir/maildir.cpp
@@ -106,12 +106,14 @@ public:
     QStringList listNew() const
     {
         QDir d( path + QString::fromLatin1( "/new" ) );
+        d.setSorting(QDir::NoSort);
         return d.entryList( QDir::Files );
     }

     QStringList listCurrent() const
     {
         QDir d( path + QString::fromLatin1( "/cur" ) );
+        d.setSorting(QDir::NoSort);
         return d.entryList( QDir::Files );
     }

which disables QDir sorting which was so prominent in callgrind traces. I get
the impression it helps the bit, but it does not seem to fix all of the
performance issue. Need to take more time to check more thoroughly.

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