[Bug 307807] Insane abuse of nepomuk causes power abuse and makes the system unusable

[LuRan]

https://bugs.kde.org/show_bug.cgi?id=307807

LuRan <hephooey_dev at fastmail.fm> changed:

           What    |Removed                     |Added
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                 CC|                            |hephooey_dev at fastmail.fm

--- Comment #10 from LuRan <hephooey_dev at fastmail.fm> ---
I decided to gave akonadi/nepomuk another try recently and have similar issue.
I actually deleted the old nepomuk database to make sure everything started
from scratch. I had 200k mails and virtuoso is using 100% cpu for 5 DAYS and
still not finished. And the worst part is most of cputime is spended on
waiting, even when there is no indexing happening, virtuoso is using 100% cpu,,
the feeder only used about 1% (I have 4 cores and virtuoso only uses 100%,
maybe related to the waiting). and according to strace, almost all is spend on
futex:
% time     seconds  usecs/call     calls    errors syscall
------ ----------- ----------- --------- --------- ----------------
 93.54    4.461622         257     17363       382 futex
  6.00    0.286012          44      6507           select
  0.40    0.018997        4749         4           fsync
  0.02    0.000993           0      5787           recvfrom
  0.02    0.000786           0      6678           lseek
  0.01    0.000612         306         2           ftruncate
  0.01    0.000490           0      5787           sendto
  0.01    0.000375           0      6684           write
  0.00    0.000000           0         4           read
  0.00    0.000000           0         2           open
  0.00    0.000000           0         2           close
  0.00    0.000000           0        48           stat
  0.00    0.000000           0         2           fstat
  0.00    0.000000           0         1           mmap
  0.00    0.000000           0         1           munmap
  0.00    0.000000           0         2           rt_sigprocmask
  0.00    0.000000           0         2           unlink
------ ----------- ----------- --------- --------- ----------------
100.00    4.769887                 48876       382 total
Comparing with the file indexing by nepomuk+strigi seems to confirm this
problem, in that case the cpu used by virtuoso is almost always below 10%

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