Re: [SCHED] wrong priority calc - SIMPLE test case

[Paolo Ornati]

On Tue, 10 Jan 2006 14:01:36 +0100
Mike Galbraith <efault@xxxxxx> wrote:

> > > Can you please try this version?  It tries harder to correct any
> >
> >It seems that you have forgotten the to attach the patch...
> 
> Drat.  At least I'm not the first to ever do so :)

This version basically works like the the previous, except that it makes
the priority adjustment faster (that is fine).

However I can fool it the same way.

"./a.out 7000"
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5459 paolo     22   0  2392  288  228 S 71.3  0.1   0:09.47 a.out

"./a.out 3000"
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5493 paolo     19   0  2396  292  228 R 49.8  0.1   0:14.42 a.out

"./a.out 1500"
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5495 paolo     18   0  2396  288  228 S 33.4  0.1   0:09.60 a.out


Fooling it:

"./a.out 7000 & ./a.out 6537 & ./a.out 6347 & ./a.out 5873 &"
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5502 paolo     19   0  2392  288  228 R 27.0  0.1   0:05.64 a.out
 5503 paolo     19   0  2396  288  228 R 26.0  0.1   0:07.50 a.out
 5505 paolo     19   0  2396  292  228 R 25.6  0.1   0:07.24 a.out
 5504 paolo     18   0  2392  288  228 R 21.0  0.1   0:06.78 a.out

(priorities fluctuate between 18/19)


Again with more of them:

./a.out 7000 & ./a.out 6537 & ./a.out 6347 & ./a.out 5873& ./a.out 6245 & ./a.out 5467 &

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5525 paolo     18   0  2396  288  228 R 26.4  0.1   0:07.48 a.out
 5521 paolo     19   0  2396  288  228 R 22.0  0.1   0:09.00 a.out
 5524 paolo     19   0  2392  288  228 R 19.6  0.1   0:07.21 a.out
 5523 paolo     19   0  2392  288  228 R 13.0  0.1   0:10.60 a.out
 5520 paolo     19   0  2392  288  228 R 11.0  0.1   0:08.46 a.out
 5522 paolo     19   0  2396  288  228 R  7.8  0.1   0:07.14 a.out

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5528 paolo     18   0  2392  288  228 R 19.7  0.1   0:18.15 a.out
 5533 paolo     15   0  2396  288  228 S 19.3  0.1   0:19.12 a.out
 5531 paolo     18   0  2396  288  228 R 18.5  0.1   0:19.23 a.out
 5532 paolo     17   0  2392  288  228 R 15.1  0.1   0:18.55 a.out
 5529 paolo     18   0  2396  288  228 R 14.7  0.1   0:13.05 a.out
 5530 paolo     18   0  2392  288  228 R 12.5  0.1   0:20.42 a.out

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5530 paolo     18   0  2392  288  228 R 21.0  0.1   0:25.42 a.out
 5533 paolo     18   0  2396  288  228 R 20.2  0.1   0:24.75 a.out
 5529 paolo     18   0  2396  288  228 R 16.2  0.1   0:17.68 a.out
 5532 paolo     18   0  2392  288  228 R 14.8  0.1   0:23.33 a.out
 5531 paolo     18   0  2396  288  228 R 14.4  0.1   0:23.96 a.out
 5528 paolo     18   0  2392  288  228 R 13.6  0.1   0:23.03 a.out


-- 
	Paolo Ornati
	Linux 2.6.15-sched_trottle2 on x86_64
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