factor: Optimize factor command with advanced factorization algorithms by naoNao89 · Pull Request #9587 · uutils/coreutils

naoNao89 · 2025-12-07T07:55:28Z

Implement modular factorization architecture with Pollard-Rho, ECM, and Fermat algorithms. Adds Montgomery arithmetic optimization and u64 fast-path for improved u128 performance. Dynamic algorithm selection based on input size routes through unified entry point.

Fixes #1456


--- Testing: 12 ---
uutils: 12: 2 2 3
GNU:    12: 2 2 3
uutils time: real       0m0.007s
GNU time:    real       0m0.007s

--- Testing: 1000000007 ---
uutils: 1000000007: 1000000007
GNU:    1000000007: 1000000007
uutils time: real       0m0.005s
GNU time:    real       0m0.006s

--- Testing: 9999999999999999999 ---
uutils: 9999999999999999999: 3 3 1111111111111111111
GNU:    9999999999999999999: 3 3 1111111111111111111
uutils time: real       0m0.004s
GNU time:    real       0m0.007s

--- Testing: 18446744073709551557 ---
uutils: 18446744073709551557: 18446744073709551557
GNU:    18446744073709551557: 18446744073709551557
uutils time: real       0m0.004s
GNU time:    real       0m0.007s

--- Testing: 123456789012345678901234567890 ---
uutils: 123456789012345678901234567890: 2 3 3 3 5 7 13 31 37 211 241 2161 3607 3803 2906161
GNU:    123456789012345678901234567890: 2 3 3 3 5 7 13 31 37 211 241 2161 3607 3803 2906161
uutils time: real       0m0.004s
GNU time:    real       0m0.006s

--- Testing: 2305843009213693951 ---
uutils: 2305843009213693951: 2305843009213693951
GNU:    2305843009213693951: 2305843009213693951
uutils time: real       0m0.004s
GNU time:    real       0m0.007s

--- Testing: 6469693230 ---
uutils: 6469693230: 2 3 5 7 11 13 17 19 23 29
GNU:    6469693230: 2 3 5 7 11 13 17 19 23 29
uutils time: real       0m0.004s
GNU time:    real       0m0.006s

--- Testing: 340282366920938463463374607431768211297 ---
uutils: 340282366920938463463374607431768211297: 340282366920938463463374607431768211297
GNU:    340282366920938463463374607431768211297: 340282366920938463463374607431768211297
uutils time: real       0m0.004s
GNU time:    real       0m0.006s

--- Testing: 9223372036854775783 ---
uutils: 9223372036854775783: 9223372036854775783
GNU:    9223372036854775783: 9223372036854775783
uutils time: real       0m0.004s
GNU time:    real       0m0.007s

--- Testing: 18446744073709551615 ---
uutils: 18446744073709551615: 3 5 17 257 641 65537 6700417
GNU:    18446744073709551615: 3 5 17 257 641 65537 6700417
uutils time: real       0m0.010s
GNU time:    real       0m0.006s

Benchmark 1: ./target/release/factor 18446744073709551557 (64-bit prime near 2^64)
  Time (mean ± σ):      35.1 ms ±   1.8 ms    [User: 25.7 ms, System: 8.1 ms]
  Output: 18446744073709551557 (prime)

Benchmark 2: ./target/release/factor 9999999999999999999 (large u64)
  Time (mean ± σ):      34.8 ms ±   1.2 ms    [User: 25.7 ms, System: 7.9 ms]
  Output: 3 3 1111111111111111111

Benchmark 3: ./target/release/factor 123456789012345678901234567890 (97-bit u128)
  Time (mean ± σ):      36.3 ms ±   7.0 ms    [User: 26.0 ms, System: 8.1 ms]
  Output: 2 3 3 3 5 7 13 31 37 211 241 2161 3607 3803 2906161

Benchmark 4: ./target/release/factor 18446743979220271189 (64-bit semiprime)
  Time (mean ± σ):      36.3 ms ±   8.1 ms    [User: 25.9 ms, System: 8.1 ms]
  Output: 4294967279 4294967291

All inputs processed in ~35-36ms consistently

naoNao89 · 2025-12-07T07:59:11Z

@asder8215 👀

oech3 · 2025-12-07T08:08:08Z

Can this close #1456 ?

github-actions · 2025-12-07T08:14:30Z

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

asder8215 · 2025-12-07T13:17:50Z

Wow, this looks awesome to see a highly optimized version of the factor command.

I won't have time to look at it today (most likely tomorrow afternoon), but this is good stuff right here

github-actions · 2025-12-08T04:03:18Z

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

github-actions · 2025-12-08T04:55:03Z

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)
Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

sylvestre · 2025-12-08T07:01:25Z

cool

a few things:

some jobs are failing
maybe add some benchmarks?!
maybe it is why codspeed isn't showing improvements
in comment #0 - i would prefer to have hyperfine output for benchmarks

codspeed-hq · 2025-12-08T07:25:29Z

CodSpeed Performance Report

Merging #9587 will not alter performance

_{Comparing naoNao89:perf/u128-performance-only (f4aa430) with main (c96b96e)}

Summary

✅ 138 untouched
🆕 12 new
⏩ 31 skipped¹

Benchmarks breakdown

	Benchmark	`BASE`	`HEAD`	Efficiency
🆕	`factorize_96bit_composite`	N/A	97.1 µs	N/A
🆕	`factor_large_u64_prime`	N/A	278.2 µs	N/A
🆕	`factor_64bit_semiprime`	N/A	176 µs	N/A
🆕	`factorize_120bit_mixed`	N/A	20.7 ms	N/A
🆕	`factorize_64bit_semiprime`	N/A	20.8 µs	N/A
🆕	`factor_medium_u64`	N/A	352 µs	N/A
🆕	`factorize_close_factors`	N/A	11 µs	N/A
🆕	`factor_batch_mixed`	N/A	348.4 µs	N/A
🆕	`factorize_32bit_semiprime`	N/A	10.4 µs	N/A
🆕	`factor_small_u64`	N/A	43.2 ms	N/A
🆕	`factorize_small_u64`	N/A	104.4 µs	N/A
🆕	`factorize_large_prime`	N/A	17.4 µs	N/A

31 benchmarks were skipped, so the baseline results were used instead. If they were deleted from the codebase, click here and archive them to remove them from the performance reports. ↩

github-actions · 2025-12-08T07:29:31Z

GNU testsuite comparison:

Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

github-actions · 2025-12-08T08:05:09Z

GNU testsuite comparison:

Congrats! The gnu test tests/stty/stty-invalid is now passing!
Congrats! The gnu test tests/stty/stty-pairs is now passing!
Note: The gnu test tests/mv/i-3 was skipped on 'main' but is now failing.
Note: The gnu test tests/stty/stty was skipped on 'main' but is now failing.
Note: The gnu test tests/stty/stty-row-col was skipped on 'main' but is now failing.

github-actions · 2025-12-08T08:38:18Z

GNU testsuite comparison:

Congrats! The gnu test tests/stty/stty-invalid is now passing!
Congrats! The gnu test tests/stty/stty-pairs is now passing!
Note: The gnu test tests/mv/i-3 was skipped on 'main' but is now failing.
Note: The gnu test tests/stty/stty was skipped on 'main' but is now failing.
Note: The gnu test tests/stty/stty-row-col was skipped on 'main' but is now failing.

github-actions · 2025-12-08T09:12:31Z

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

github-actions · 2025-12-08T09:31:05Z

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

github-actions · 2025-12-08T10:12:19Z

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)
Skip an intermittent issue tests/timeout/timeout (fails in this run but passes in the 'main' branch)

github-actions · 2025-12-10T07:25:33Z

GNU testsuite comparison:

Skip an intermittent issue tests/tail/overlay-headers (fails in this run but passes in the 'main' branch)

github-actions · 2025-12-10T17:33:25Z

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

github-actions · 2025-12-10T21:33:31Z

GNU testsuite comparison:

Skipping an intermittent issue tests/tail/overlay-headers (passes in this run but fails in the 'main' branch)

naoNao89 · 2025-12-11T15:06:38Z

next phase for 400bit

time target/release/factor
 18042293517206497542309510624433271319838885652990797220840253733663197676853651276247377312     
DEBUG: Attempting yamaquasi SIQS for 287-bit number
DEBUG: yamaquasi found factor: 73 bits
18042293517206497542309510624433271319838885652990797220840253733663197676853651276247377312: 2 2 2 2 2 11 293 7189204372506229734671 24333278690998283582226208220580048953269361177999035383847458677
target/release/factor   1.72s user 0.03s system 378% cpu 0.463 total

naoNao89 force-pushed the perf/u128-performance-only branch from 561e1cf to 3673060 Compare December 7, 2025 07:58

naoNao89 marked this pull request as draft December 7, 2025 08:01

naoNao89 force-pushed the perf/u128-performance-only branch from 3673060 to 78e5601 Compare December 8, 2025 03:47

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sylvestre force-pushed the perf/u128-performance-only branch from e92a74c to e4125bf Compare December 8, 2025 07:00

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naoNao89 mentioned this pull request Dec 10, 2025

test(more): Fix test_from_line_option race condition by increasing PTY delay #9629

Merged

naoNao89 mentioned this pull request Dec 11, 2025

hotfix(tail): skip events for untracked files in follow mode #9630

Open

naoNao89 marked this pull request as ready for review December 11, 2025 15:02

naoNao89 mentioned this pull request Dec 11, 2025

test(tail): fix flaky test_follow_name_multiple on macOS #9636

Open

uutils deleted a comment from github-actions bot Dec 26, 2025

factor: optimize for u128 performance with modular architecture

f4aa430

naoNao89 force-pushed the perf/u128-performance-only branch 3 times, most recently from 7a5f4fd to f4aa430 Compare January 3, 2026 01:00

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