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Date: Mon, 6 Aug 2012 16:04:32 +0200 From: Pedro Larroy <pedro.larroy.lists@...il.com> To: linux-kernel@...r.kernel.org Subject: unfair scheduling with tbb application observed, could it be a kernel issue? 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. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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