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Avoid ledger copy and mutation in Sparse_ledger.of_ledger_subset_exn #14587

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merged 26 commits into from
Dec 5, 2023
Merged

Avoid ledger copy and mutation in Sparse_ledger.of_ledger_subset_exn #14587

merged 26 commits into from
Dec 5, 2023

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mrmr1993
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This PR builds upon #14586, removing the Ledger.copy and Ledger.create_empty_exn calls from Sparse_ledger.of_ledger_subset_exn. This function takes a significant amount of time in staged ledger diff application, and so this PR should further improve performance there.

Checklist:

  • Dependency versions are unchanged
    • Notify Velocity team if dependencies must change in CI
  • Modified the current draft of release notes with details on what is completed or incomplete within this project
  • Document code purpose, how to use it
    • Mention expected invariants, implicit constraints
  • Tests were added for the new behavior
    • Document test purpose, significance of failures
    • Test names should reflect their purpose
  • All tests pass (CI will check this if you didn't)
  • Serialized types are in stable-versioned modules
  • Does this close issues? List them

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@sebastiencs
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From what I understand, Ledger.create_empty_exn is slow because it indirectly calls Masking_merkle_tree.set, which re-compute all hashes for each new accounts:
https://github.com/MinaProtocol/mina/blob/55d20405f195b3f8e4d6603e216798191472d707/src/lib/merkle_mask/masking_merkle_tree.ml#L318C1-L327C38

There are multiple PRs opened to optimize transaction applications by avoiding access to disk, but I don't think that the slowness comes from those DB access.

The slowest part is that every modification to a Mask re-computes all hashes.
A solution would be to delay re-hashing a Mask until one of the method merkle_root or merkle_path is called.
In the case of Sparse_ledger.of_ledger_subset_exn, with new accounts, no hashing is even required since those are empty accounts.

@mrmr1993 mrmr1993 mentioned this pull request Nov 21, 2023
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From what I understand, Ledger.create_empty_exn is slow because it indirectly calls Masking_merkle_tree.set, which re-compute all hashes for each new accounts:

Indeed, we already knew and were working on a fix. To keep the PRs small and testing more modular, it's in its own PR here: #14594

@mrmr1993 mrmr1993 marked this pull request as ready for review November 21, 2023 18:23
@mrmr1993 mrmr1993 requested a review from a team as a code owner November 21, 2023 18:23
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@georgeee georgeee force-pushed the feature/merkle-mask-dont-rehash branch from cd8f02c to 10fe9b6 Compare November 27, 2023 18:09
@georgeee georgeee force-pushed the feature/sparse-ledger-of-subset-no-mutability branch from d2f3c8d to dbfe750 Compare November 27, 2023 18:23
ghost-not-in-the-shell
ghost-not-in-the-shell reviewed Nov 28, 2023
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src/lib/mina_ledger/sparse_ledger.ml Outdated
non_empty_locations
in
let merkle_paths = Ledger.merkle_path_batch oledger merkle_path_locations in
(let rec pop_empties num_empties merkle_paths locations acc =
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Can't we just do a list.split here? We don't use the location of empty accounts later.
I think we could just have List.split merkle_paths num_new_accounts here.

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@ghost-not-in-the-shell do you mind implementing this change and committing to this PR?

@georgeee georgeee force-pushed the feature/sparse-ledger-of-subset-no-mutability branch 3 times, most recently from 2120e7c to 44c86cc Compare November 28, 2023 20:15
@georgeee georgeee changed the base branch from feature/merkle-mask-dont-rehash to feature/merkle-mask-empty-account-preloading November 28, 2023 20:32
@georgeee georgeee force-pushed the feature/sparse-ledger-of-subset-no-mutability branch from 44c86cc to a8b5b8e Compare November 28, 2023 20:32
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@deepthiskumar
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@georgeee georgeee force-pushed the feature/sparse-ledger-of-subset-no-mutability branch from c86eced to 9c89cca Compare December 1, 2023 20:57
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!ci-nightly-me

nholland94 and others added 9 commits December 1, 2023 22:08
@nholland94 @georgeee
Replace tables with maps in merkle masks
758955f
@nholland94 @georgeee
Fix merkle ledger tests
175c24a
@nholland94 @georgeee
Use map refs instead of mutable map fields
8371f64
@georgeee
Fixup after rebase
4403440
@deepthiskumar
Merge branch 'feature/merkle-mask-empty-account-preloading' into feat…
a27ed50 
…ure/sparse-ledger-of-subset-no-mutability
@deepthiskumar
Merge branch 'feature/sparse-ledger-of-subset-no-mutability' into fea…
5baa860 
…ture/sparse-ledger-wide-merkle-paths
@deepthiskumar
Merge branch 'feature/sparse-ledger-wide-merkle-paths' into feature/l…
7240af9 
…edger-mask-maps
@deepthiskumar
Merge pull request #14595 from MinaProtocol/feature/ledger-mask-maps
6458ec8 
Replace tables with maps in merkle masks
@deepthiskumar
Merge pull request #14594 from MinaProtocol/feature/sparse-ledger-wid…
5364a0f 
…e-merkle-paths

Use 'wide merkle paths' to optimize `Sparse_ledger.of_ledger_subset_exn`
@deepthiskumar deepthiskumar merged commit dc434fa into feature/merkle-mask-empty-account-preloading Dec 5, 2023
1 check passed
@deepthiskumar deepthiskumar deleted the feature/sparse-ledger-of-subset-no-mutability branch December 5, 2023 06:32
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@mrmr1993 @sebastiencs @ghost-not-in-the-shell @deepthiskumar @georgeee @nholland94