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On Wed, 2011-10-19 at 17:32 +0200, Stephan Bergmann wrote:
What the LibO hsqldb code does a lot is call JNI's 
Attach/DetachCurrentThread.  Googling around, 
<http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6929067> "Stack 
guard pages should be removed when thread is detached" suggests that 
reading /proc/self/maps might have been added into 
Attach/DetachCurrentThread as part of a bug fix.  That would explain things.

        Good catch ! The irony ... :-) this Java bug was kindly fixed for us
indirectly via Andrew Haley to address the bad stack page left around when
we had run some java. That page was causing crashes in calc formula computation
in large sheets.

        It seems we can't win at some stage here. Andrew - I wonder are other
people getting frustrated by performance here too ? it seems there is
some huge /proc/self/maps thrash as we enter/exit Java now on Linux.

        ATB,

                Michael.

-- 
michael.meeks@suse.com  <><, Pseudo Engineer, itinerant idiot


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