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consider cache lines, and tail non-avx-able ops #9

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merged 1 commit into from
Aug 11, 2024
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@PhilipDeegan PhilipDeegan commented Aug 7, 2024

Summary by CodeRabbit

  • Improvements
    • Updated the GitHub Actions workflow to enhance the downloading process of the mkn_nix executable using curl, improving reliability and conciseness.
    • Refined the performance and structure of the LazyEvaluator for more efficient data processing and potential future optimizations.
    • Adjusted the constant value in tests to increase the parameter size, potentially impacting performance and outcomes in related operations.

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coderabbitai bot commented Aug 7, 2024

Walkthrough

The recent changes streamline the GitHub Actions workflow for downloading the mkn_nix executable, improving the download method from wget to curl. Additionally, the LazyEvaluator struct in lazy.hpp has been refactored for better clarity and performance by using a lambda function, while a constant in test_lazy.cpp was adjusted to enhance testing parameters. These updates enhance both reliability and efficiency in the codebase.

Changes

File Change Summary
.github/workflows/build_nix.yml Updated the download method for mkn_nix from wget to curl for enhanced reliability and conciseness.
inc/mkn/avx/lazy.hpp Refactored LazyEvaluator to encapsulate logic in a lambda function, improving clarity and modularity, and optimized batch processing by incorporating hardware interference size.
test/test_lazy.cpp Increased the constant N from 1e6 to 1e6 + 5, adjusting test parameters without altering overall structure or logic.

Poem

Hop, hop, hooray, what a bright new day!
With curl in the lead, our downloads won't stray.
The LazyEvaluator dances, so clear and so neat,
While constants grow larger, making tests more sweet.
Let's celebrate changes, let our code play! 🐇✨


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Actionable comments posted: 0

Review details

Configuration used: CodeRabbit UI
Review profile: CHILL

Commits

Files that changed from the base of the PR and between b83ca47 and d0f2b78.

Files selected for processing (3)
  • .github/workflows/build_nix.yml (1 hunks)
  • inc/mkn/avx/lazy.hpp (2 hunks)
  • test/test_lazy.cpp (1 hunks)
Files skipped from review due to trivial changes (1)
  • .github/workflows/build_nix.yml
Additional comments not posted (14)
test/test_lazy.cpp (10)

Line range hint 101-111:
LGTM!

The code changes are approved.


Line range hint 17-23:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the mul function is not negatively impacted by the updated constant N.


Line range hint 91-99:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fn1 function is not negatively impacted by the updated constant N.

Verification successful

Function fn1 is only used in the test file and does not impact the main codebase's performance.

  • The function fn1 is only found in test/test_lazy.cpp.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the performance of the `fn1` function.

# Test: Search for the function usage. Expect: Only occurrences of the function.
rg --type cpp 'void fn1\(\)'

Length of output: 60


Line range hint 80-89:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fn0 function is not negatively impacted by the updated constant N.


Line range hint 53-62:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fma1 function is not negatively impacted by the updated constant N.


7-7: Verify the impact of the updated constant N.

The constant N has been updated from 1e6 to 1e6 + 5. Ensure that this change does not negatively impact performance or outcomes in functions that rely on N.

Verification successful

Verify the impact of the updated constant N.

The constant N has been updated from 1e6 to 1e6 + 5. The change is minor and is unlikely to negatively impact performance or outcomes in functions that rely on N.

  • The constant N is used in test/test_lazy.cpp for initializing vectors and performing various operations.
  • The increase in size by 5 elements is relatively minor.
Scripts executed

The following scripts were executed for the analysis:

Script:

#!/bin/bash
# Description: Verify the impact of the updated constant `N`.

# Test: Search for the constant usage. Expect: Only occurrences of the new value.
rg --type cpp 'constexpr static std::size_t N = 1e6 \+ 5'

Length of output: 120


Script:

#!/bin/bash
# Description: Search for all occurrences and usages of the constant `N` in the codebase.

# Test: Find all usages of the constant `N`.
rg 'N' -A 5 -B 5 --type cpp

Length of output: 42580


Line range hint 43-51:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fma0 function is not negatively impacted by the updated constant N.


Line range hint 64-72:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fma2 function is not negatively impacted by the updated constant N.


Line range hint 9-15:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the add function is not negatively impacted by the updated constant N.


Line range hint 25-41:
LGTM! But verify the function's performance.

The code changes are approved.

However, ensure that the performance of the fma3 function is not negatively impacted by the updated constant N.

inc/mkn/avx/lazy.hpp (4)

178-237: LGTM!

The introduction of the do_avx lambda function improves the clarity and modularity of the code.


228-236: LGTM!

The adjustment to batch sizes using std::hardware_destructive_interference_size optimizes memory access patterns.


183-225: LGTM!

The refined handling of temporary variables results in a more efficient flow of data processing.


Line range hint 151-167:
LGTM!

The updated compile method ensures that the correct operand references are maintained during compilation.

@PhilipDeegan PhilipDeegan merged commit a645d68 into master Aug 11, 2024
1 check passed
@PhilipDeegan PhilipDeegan deleted the next branch August 20, 2024 16:16
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