experimental: try a container growth factor of 1.5x #14811
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instead of 2x. we will have to see if this has an impact in our regular performance tests.
goedderz
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Sep 23, 2021
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I took the time to quickly search for this. folly does this for its fbvector implementation with 1.5 as well, except for smaller capacities, where 2 is used. And what "smaller capacity" means may depend on jemalloc.
This is to exactly match the block sizes of the allocator if possible for small sizes, and start to try and re-use memory for larger sizes.
https://github.com/facebook/folly/blob/master/folly/FBVector.h#L1151
https://github.com/facebook/folly/blob/master/folly/docs/FBVector.md
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goedderz
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Sep 23, 2021
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jsteemann
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Sep 27, 2021
goedderz
reviewed
Sep 28, 2021
Co-authored-by: Tobias Gödderz <tobias@arangodb.com>
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goedderz
approved these changes
Sep 28, 2021
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Merging now after 3.9 branch-off... |
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Scope & Purpose
Should be merged for 3.10.
As suggest by @goedderz in #14803 (comment):
Experimental: try a container growth factor of 1.5x instead of 2x. We will have to see if this has an impact in our regular performance tests.
If this does not have any measurable or a negative effect on performance, we can simply revert the changes in this PR.
Backports:
Testing & Verification