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What Happens When 4096 Cores All Do synchronize_rcu_expedited()?
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lca
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lca2016
--room r1mix 10665 --force
Next: 12 Adventures in OpenPower Firmware
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Marks
Author(s):
Paul McKenney
Location
Costa Hall
Date
feb Wed 03
Days Raw Files
Start
13:20
First Raw Start
13:13
Duration
0:45:00
Offset
0:06:31
End
14:05
Last Raw End
14:13
Chapters
00:00
0:03:07
0:13:07
0:23:07
0:33:07
0:43:07
Total cuts_time
46 min.
https://linux.conf.au/schedule/30164/view_talk
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In order to operate efficiently on very large systems, algorithms must avoid high levels of contention on global locks, global counters, and pretty much all other global mechanisms. So what is a parallel algorithm to do? My usual advice might be expected to be "Use RCU!", but that advice is not always helpful within an RCU implementation. This presentation will illustrate some useful parallel techniques, using expedited RCU grace periods as a vehicle for motivating these techniques and for demonstrating their effectiveness.
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