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Load balancing for LTO
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Authored by david2050 on Apr 9 2019, 7:32 PM.



Use bitcode size as an estimated for compilation time and sort
compilation tasks in order decreasing sizee to provide better
load balance when there are large number of taks.

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david2050 created this revision.Apr 9 2019, 7:32 PM
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fhahn added a subscriber: fhahn.Apr 10 2019, 5:04 AM
mehdi_amini added inline comments.Apr 11 2019, 5:48 PM

The ThinLink has access to much fine grain data: like number of function and number of instructions. Have you looked into using this?



I used a separate index vector in ThinLTOCodeGenerator to do the same, it may make the code a bit easier to track (less pair<> and .first->second kind of thing).

david2050 planned changes to this revision.Apr 11 2019, 6:54 PM
david2050 marked 2 inline comments as done.
david2050 added inline comments.

I did not explore alternatives. This was effective for the workloads that motivated it so I thought I would share.


Your implementation is cleaner. I may not have time to retest.

david2050 updated this revision to Diff 194799.Apr 11 2019, 7:41 PM

copy & paste & modify :-) from Mehdi pointerwd

ormris added a subscriber: ormris.Apr 12 2019, 9:36 AM