Re: [ANNOUNCE][RFC] PlugSched-6.2 for 2.6.16-rc1 and 2.6.16-rc1-mm1

[Paolo Ornati <ornati@fastwebnet.it>]

On Fri, 20 Jan 2006 08:45:43 +1100
Peter Williams <pwil3058@bigpond.net.au> wrote:

> Modifications have been made to spa_ws to (hopefully) address the issues 
> raised by Paolo Ornati recently and a new entitlement based 
> interpretation of "nice" scheduler, spa_ebs, which is a cut down version 
> of the Zaphod schedulers "eb" mode has been added as this mode of Zaphod 
> performed will for Paolo's problem when he tried it at my request. 
> Paolo, could you please give these a test drive on your problem?

---- spa_ws: the problem is still here

(sched_fooler)
./a.out 3000 & ./a.out 4307 &

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5573 paolo     34   0  2396  292  228 R 59.0  0.1   0:24.51 a.out
 5572 paolo     34   0  2392  288  228 R 40.7  0.1   0:16.94 a.out
 5580 paolo     35   0  4948 1468  372 R  0.3  0.3   0:00.04 dd

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5573 paolo     34   0  2396  292  228 R 59.3  0.1   0:59.65 a.out
 5572 paolo     33   0  2392  288  228 R 40.3  0.1   0:41.32 a.out
 5440 paolo     28   0 86652  21m  15m S  0.3  4.4   0:03.34 konsole
 5580 paolo     37   0  4948 1468  372 R  0.3  0.3   0:00.10 dd


(real life - transcode)
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5585 paolo     33   0  115m  18m 2432 S 90.0  3.7   0:38.04 transcode
 5599 paolo     37   0 50996 4472 1872 R  9.1  0.9   0:04.03 tcdecode
 5610 paolo     37   0  4948 1468  372 R  0.6  0.3   0:00.19 dd


DD test takes ages in both cases.

What exactly have you done to spa_ws?


---- spa_ebs: great! (as expected)

(sched_fooler)
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5418 paolo     34   0  2392  288  228 R 51.4  0.1   1:06.47 a.out
 5419 paolo     34   0  2392  288  228 R 43.7  0.1   0:54.60 a.out
 5448 paolo     11   0  4952 1468  372 D  3.0  0.3   0:00.12 dd

(transcode)
  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 5456 paolo     34   0  115m  18m 2432 R 51.9  3.7   0:23.34 transcode
 5470 paolo     12   0 51000 4472 1872 S  5.7  0.9   0:02.38 tcdecode
 5480 paolo     11   0  4948 1468  372 D  3.5  0.3   0:00.33 dd

Very good DD test performance in both cases.


-- 
	Paolo Ornati
	Linux 2.6.16-rc1-plugsched on x86_64