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Comments (3)

archshift avatar archshift commented on June 2, 2024

It makes sense for DynStack to be a little bit slower here as you don’t actually dereference the Box. But I think there’s some room for optimizing our iterator implementation.

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faern avatar faern commented on June 2, 2024

Yes. The comparison here is unfair. Since for access_native (which is probably meant to be named access_naive like the others?) is actually calling black_box::<Box<usize>>(i) while access_dynstack is calling black_box<usize>(i). So you are not measuring accessing all the integers in access_native.

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breezewish avatar breezewish commented on June 2, 2024

Thanks for pointing out that I missed a dereference for access_native 😆

Re-run using some dereferences and now they look to be very close:

access_native           time:   [1.7039 us 1.7159 us 1.7286 us]                              
Found 6 outliers among 100 measurements (6.00%)
  4 (4.00%) high mild
  2 (2.00%) high severe

access_dynstack         time:   [1.7637 us 1.7747 us 1.7865 us]                                
Found 7 outliers among 100 measurements (7.00%)
  4 (4.00%) high mild
  3 (3.00%) high severe

Additionally found that when Boxes are allocated discretely, DynStack performs better as expected:

access_native           time:   [1.8888 us 1.9224 us 1.9606 us]                              
Found 6 outliers among 100 measurements (6.00%)
  5 (5.00%) high mild
  1 (1.00%) high severe

access_dynstack         time:   [1.7361 us 1.7598 us 1.7841 us]                                
Found 8 outliers among 100 measurements (8.00%)
  7 (7.00%) high mild
  1 (1.00%) high severe

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