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fix: stop overriding the engine's --max-temp-files default - #24
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📝 WalkthroughWalkthroughThe CLI no longer overrides the engine’s ChangesTemporary-file limit behavior
Estimated code review effort: 2 (Simple) | ~10 minutes Merge Risk: 🔵 Low · up to The change removes mako's obsolete max-temp-files override and relies on the engine's defaults, but the declared fgumi 0.5.0 dependency and README's 0.6.0 auto-sizing behavior remain inconsistent, which could confuse users about the effective default; the PR is otherwise mergeable with explicit owner follow-up. Possibly related issues
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Inline comments:
In `@README.md`:
- Line 95: Correct the README description of mako’s --max-temp-files default to
match the resolved fgumi version: either upgrade fgumi to 0.6.0 or later and
update the lockfile and tests so the auto/RLIMIT_NOFILE behavior is true, or
revise the documentation to state the fixed default of 64.
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README.mdsrc/main.rstests/cli.rs
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fgumi 0.6.0 changes `Sort::max_temp_files` from `Option<usize>` to
`MaxTempFiles { Auto, Fixed(usize) }` with a clap default of `auto`, so
`main.rs`'s `.or(Some(DEFAULT_MAX_TEMP_FILES))` no longer compiles — and,
more to the point, no longer expresses anything. The override worked by
reading absence: `None` meant "user did not pass the flag", which is when
mako substituted 256. With a clap default there is no absence to read, so
mako cannot distinguish an unset flag from an explicit `--max-temp-files
auto`, and any substitution would silently override a user who asked for
auto-sizing.
Drop the override entirely rather than reconstruct the distinction. mako is
a thin wrapper that flattens fgumi's `Sort` clap struct precisely so it
tracks the engine's CLI without maintaining a parallel opinion, and the
engine now does what the 256 default was reaching for: `auto` sizes the
limit from the process's `RLIMIT_NOFILE` budget, which lands far above the
run counts a whole-genome sort spills. The 14%-on-1.29B-reads result that
motivated the raised default still holds; it is now the engine's behavior
rather than mako's.
Also make the spilled-run scrape in the consolidation test read either
`Temporary chunks: N` (through fgumi 0.5.0) or `[N spills]` (0.6.0+). mako
is built against both: its crates.io pin, and the unreleased candidate that
fgumi-benchmarks compiles it against via a path dependency.
The default-limit test is removed rather than rewritten. There is no
override left to defeat, and no assertion covers both engine versions —
0.5.0 defaults to a fixed 64 and logs no temp-file configuration line at
all, while 0.6.0 defaults to `auto` and reports its RLIMIT_NOFILE
provenance. A test pinned to 0.6.0's wording fails against the crates.io
pin; one weakened to pass on both is vacuous on it. A comment records the
assertion to add once the pin moves.
Verified green both ways: 12 tests, fmt and clippy clean against crates.io
fgumi 0.5.0, and 12 tests against the 0.6.0 candidate via a path dependency.
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fgumi 0.6.0 lands the temp-file work mako was waiting on: `--max-temp-files`
becomes `MaxTempFiles { Auto, Fixed(usize) }` with a clap default of `auto`,
which sizes the spilled-run consolidation limit from the process's soft
`RLIMIT_NOFILE` — `clamp(soft - 32, 16, 1024)` — instead of a fixed 64.
mako's own override was already deleted in #24, so `main.rs` needs no change;
the engine now does what the 256 default was reaching for, sized to the host
rather than guessed. What this commit finishes is the follow-through #24
deferred until the pin moved.
Add the default-limit test that comment recorded. With no `--max-temp-files`,
the engine must log `Max temp files: N (derived from RLIMIT_NOFILE soft limit
S)` — direct evidence that `auto` survived mako's flattened `Sort` struct,
since any mako-side default would arrive as a number and be logged bare. The
consequence, no consolidation pass at a spill count a fixed 64 would
consolidate at, is asserted under a `resolved > runs` guard: the auto limit is
a property of the host's descriptor budget, so a low `ulimit -n` should make
that assertion inapplicable rather than failing. Observed locally at
resolved 1024 against 129 spilled runs, so the guard is live and not vacuous.
Also assert the explicit case against the same log line. `--max-temp-files 64`
must be reported back as exactly `64`; the pre-existing consolidation-happened
check confirms the value reached the sorter, but on its own it would pass for
any limit below the run count.
Drop the pre-0.6.0 `Temporary chunks: N` branch from the spilled-run scrape.
0.6.0 reports the count only as `[N spills]` in the phase breakdown, and with
the pin moved there is no version left in play that logs the other spelling.
README: `--max-temp-files` is documented as `auto` and what it derives from,
rather than as the pinned engine's fixed 64.
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Why
fgumi 0.6.0 changes
Sort::max_temp_filesfromOption<usize>toMaxTempFiles { Auto, Fixed(usize) }with a clap default ofauto.main.rs's.or(Some(DEFAULT_MAX_TEMP_FILES))no longer compiles:More importantly, it no longer expresses anything. The override worked by reading absence:
Nonemeant "the user did not pass the flag", which is when mako substituted 256. With a clap default there is no absence left to read — mako cannot distinguish an unset flag from an explicit--max-temp-files auto, so any substitution would silently override a user who asked for auto-sizing.What
Drop the override rather than reconstruct the distinction. mako flattens fgumi's
Sortclap struct precisely so it tracks the engine's CLI without maintaining a parallel opinion, and the engine now does what the raised default was reaching for:autosizes the limit fromRLIMIT_NOFILE(clamp(soft - 32, 16, 1024)), landing far above the run counts a whole-genome sort spills. The 14%-on-1.29B-reads result that motivated 256 still holds — it is now the engine's behavior rather than mako's. README updated accordingly.Two test changes:
Temporary chunks: N(through fgumi 0.5.0) or[N spills](0.6.0+, where the sort summary was restructured into a phase breakdown). mako is built against both — its crates.io pin, and the unreleased candidate that fgumi-benchmarks compiles it against via a path dependency.autoand reports itsRLIMIT_NOFILEprovenance. A test pinned to 0.6.0's wording fails against the crates.io pin; one weakened to pass on both is vacuous on it. A comment records the assertion to add once the pin moves to 0.6.0.Testing
Green both ways:
fgumi = "0.5.0"(the declared pin, what CI builds): 12 tests pass,cargo fmt --checkandcargo clippy --all-targets -- -D warningsclean.fgumi = { path = ... }at the v0.6.0 candidate: 12 tests pass.Note on how this was found
mako's CI could not have caught this. The crates.io pin builds against 0.5.0, where the old API still exists, so CI is green while mako is broken against the fgumi that is about to ship. It surfaced in fgumi-benchmarks, whose Docker build rewrites the pin to a path dependency on the exact fgumi commit under test — currently the head of the v0.6.0 release PR. That rewrite is the only thing that compiles mako against unreleased fgumi.
Summary by CodeRabbit
Performance
Bug Fixes
Documentation