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Subjectunfair scheduling with tbb application observed, could it be a kernel issue?
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Hi

I think we are observing unfair scheduling of processes that use intel
TBB thread scheduler, as we have several processes with nice of 19 and
ioniced idle, and somehow the process with nice 0 should be getting
more than 1000% cpu

Any ideas? Kernel is 3.0.0.-17-generic on unbutu 11.10.


Avg[||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||99.6%]
Tasks: 331; 81 running
Mem[||||||||||||||||||||||||||||||||||||||||||||||||||||||||36386/96868MB]
Load average: 76.99 46.08 34.32
Swp[|||||||||
534/4099MB] Time: 15:51:51
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
10597 disco 39 19 6772M 6366M 14384 R 636. 6.6 37:56.63
/map_store/developers/disco/12_08_06-13_53_1344254009-j3UGmL/mmcc -X
178 -c /map_store/de
11629 visciano 20 0 6106M 5504M 18668 R 585. 5.7 39:02.15
build/release/mmcc -D --compact -f 8 -h bfmapcomp03.europe.nokia.com
-d 1521 -s LDMTEST -
10235 disco 39 19 4566M 4190M 12512 R 197. 4.3 25:13.58
/map_store/developers/disco/12_08_06-13_53_1344254009-j3UGmL/mmcc -X
183 -c /map_store/de
11599 disco 39 19 4935M 4644M 12572 R 188. 4.8 15:44.48
/map_store/developers/disco/12_08_06-13_53_1344254009-j3UGmL/mmcc -X
176 -c /map_store/de
11996 disco 39 19 4407M 4164M 12580 R 103. 4.3 12:08.25
/map_store/developers/disco/12_08_06-13_53_1344254009-j3UGmL/mmcc -X
174 -c /map_store/de
12630 disco 39 19 1804M 1589M 12248 R 101. 1.6 4:31.51
/map_store/developers/disco/12_08_06-13_53_1344254009-j3UGmL/mmcc -X
172 -c /map_store/de
Another example, the processes at 100% not being throttled at all when
having more processes waiting with higher priority:


Tasks: 559 total, 37 running, 522 sleeping, 0 stopped, 0 zombie
Cpu(s): 67.8%us, 16.0%sy, 13.0%ni, 1.7%id, 0.6%wa, 0.0%hi, 1.0%si, 0.0%st
Mem: 98998032k total, 97444688k used, 1553344k free, 53772k buffers
Swap: 4198316k total, 704860k used, 3493456k free, 73270776k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
14373 disco 39 19 8734m 6.9g 12m R 107 7.3 36:09.72 mmcc
15293 disco 39 19 3174m 1.4g 12m R 101 1.5 19:33.79 mmcc
20341 disco 39 19 2735m 1.1g 12m R 101 1.1 8:40.38 mmcc
18241 disco 39 19 3040m 1.3g 11m R 100 1.4 14:27.91 mmcc
15204 disco 39 19 5418m 3.7g 12m R 99 3.9 20:53.89 mmcc
24901 larroy 20 0 327m 296m 4276 R 88 0.3 0:04.14 cc1plus
24942 larroy 20 0 193m 159m 4008 R 87 0.2 0:01.47 cc1plus
24862 larroy 20 0 417m 388m 7992 R 84 0.4 0:07.02 cc1plus
24959 larroy 20 0 184m 153m 4008 R 80 0.2 0:01.32 cc1plus
24935 larroy 20 0 254m 222m 4024 R 77 0.2 0:02.44 cc1plus
24919 larroy 20 0 336m 301m 4036 R 76 0.3 0:03.61 cc1plus
24972 larroy 20 0 43160 15m 2332 R 76 0.0 0:00.95 cc1plus
24918 larroy 20 0 287m 255m 4024 R 70 0.3 0:02.99 cc1plus
24962 larroy 20 0 44872 17m 2332 R 69 0.0 0:01.23 cc1plus
24976 larroy 20 0 41212 14m 2332 R 66 0.0 0:00.67 cc1plus
24501 larroy 20 0 687m 657m 8044 R 64 0.7 0:22.97 cc1plus
24933 larroy 20 0 211m 177m 4008 R 62 0.2 0:01.79 cc1plus
24899 larroy 20 0 327m 296m 4276 R 57 0.3 0:04.25 cc1plus

This is 3.2.0-26-generic on ubuntu 12.04

Regards.

Pedro.


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