Utku Ozdemir a89d270cd3

fix: replace gotextdiff with linear-space Myers diff to prevent OOM ...

The gotextdiff/myers library uses the naive Myers algorithm variant that stores the full edit trace, resulting in O((M+N)^2) space complexity.

For machine configs with large inline K8s manifests (thousands of lines), this causes massive memory spikes — e.g., 80K lines allocates ~98 GB and gets OOM-killed.

Replace it with neticdk/go-stdlib/diff/myers which implements the linear-space Myers variant (divide-and-conquer). Memory usage drops from ~25 GB to ~8 MB for 40K-line inputs.

The diff output format is unchanged (unified diff with @@ hunks).

Co-authored-by: Artem Chernyshev <artem.chernyshev@talos-systems.com>
Co-authored-by: Oguz Kilcan <oguz.kilcan@siderolabs.com>
Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>

2026-02-12 15:06:43 +01:00

..

testdata

fix: replace gotextdiff with linear-space Myers diff to prevent OOM

2026-02-12 15:06:43 +01:00

diff_test.go

fix: replace gotextdiff with linear-space Myers diff to prevent OOM

2026-02-12 15:06:43 +01:00

diff.go

fix: replace gotextdiff with linear-space Myers diff to prevent OOM

2026-02-12 15:06:43 +01:00