[Bug 22503] New: wineserver: massive amount of rescheduling interupts / context switches on +1.8GB application load ( both wine32 / wine64 )

http://bugs.winehq.org/show_bug.cgi?id=22503

Summary: wineserver: massive amount of rescheduling interupts /
                    context switches on +1.8GB application load ( both
                    wine32 / wine64 )
           Product: Wine
           Version: 1.1.43
          Platform: All
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: wineserver
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

Created an attachment (id=27570)
 --> (http://bugs.winehq.org/attachment.cgi?id=27570)
memory usage vs CPU load from 2.1GB to 1.7GB RAM

Wineserver creates a massive amount of rescheduling interupts / context
switching when using + 1.8GB RAM application load, both on Wine32 and the
Wine64 versions ( meaning the 64 bit Wine, not the 32 bit for 64bit systems )
The rescheduling becomes very apparant when going over 2GB RAM usage, and will
effectively hog down an SMP processor to a crawl.

For a long time I've been using Wine to succesfully run various brands of
renderers ( Lightwave / Maya / Fryrender / Maxwell ... )

The problem exists already for a long time, but became very apparant when I
recently switched (compiled) to Wine64 because of a big project. ( Previous
projects never needed the amount of ram needed for the current one )

Reverting back to Wine32 bit ( which should run fine as long as I stay under
4GB ) showed me the exact same slow down, except that on wine32 "top" for some
reason doesn't show visually wineserver consuming a lot of resources ( only
visible on Wine64 )
... nevertheless the amount of rescheduling interupts and context switches
skyrocket at exact the same loads for both versions.

This behaviour is visible on various ( CLI based ) multithreaded renderers
which makes me confident in believing it is not related to a renderer specific
DLL.

I would flag this bug as major as in quite a short while other applications /
games will encounter the same issue.

I know a fair share of programming and can do some debugging, but I'm not very
familiar with all the Wine components / not sure what logs / graphs I should
submit ( I've got quite a few ).
Any debug commands to pinpoint the problem are usefull too.

The added graph shows the CPU load/interupts whith variable memory usage from
+2.1GB to +1.7GB on a compute node > the lower the memory usage, the higher the
CPU load. ( ignore the halted state between 8.30PM/5AM )

Thx

Jan Van Haute