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Groups > linux.kernel > #1370560 > unrolled thread
| Started by | nad gam <nadavkernel@gmail.com> |
|---|---|
| First post | 2016-04-04 13:40 +0200 |
| Last post | 2016-04-04 13:40 +0200 |
| Articles | 1 — 1 participant |
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why cfs load balancer (3.14.1) doesnt pull tasks of busier run queue ? nad gam <nadavkernel@gmail.com> - 2016-04-04 13:40 +0200
| From | nad gam <nadavkernel@gmail.com> |
|---|---|
| Date | 2016-04-04 13:40 +0200 |
| Subject | why cfs load balancer (3.14.1) doesnt pull tasks of busier run queue ? |
| Message-ID | <rkb1n-2kr-1@gated-at.bofh.it> |
Im working with ubuntu with kernel 3.14.1 .The computer has intel's i7 processor - which has 4 hyper threaded cores - so in total 8 logical cores . I run processes that does sqrt in infinite loop - just to try and get cpu time - I create 15 for each logical core with set affinity syscall(15 attached to core 0, 15 to core 1 and so on..) When I disable one of the cores - for eg core 7, all of its process move to core 3 (which is the core other thread ..) and stay like that . So now there's imbalance as run queue 3 has almost double the load of any other cpu. The cpu_allowed of this process is changed to 11111111 - which mean they should be allowed to be scheduled to all cpus , but they just stick to cpu 3 , even though its load is twice as any other logical core . What could be the problem ? where in the kernel code should I look? Thanks !
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