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21 changes: 13 additions & 8 deletions .claude/rules/perf-fork-budget.md
View file
Open in desktop
Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
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docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

View file


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Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Force GitHub README to respect dark mode
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style.textContent = '
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docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

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Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Highlight search terms from Google/DuckDuckGo/Bing referrer
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var ref = document.referrer;
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} catch(__e) { console.warn('[Userscript:Highlight Search Terms]', __e); }
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try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
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#818
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Strip utm_, fbclid, gclid, etc. from all links on page
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observer.observe(document.body, { childList: true, subtree: true });
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} catch(__e) { console.warn('[Userscript:Remove Tracking Parameters from Links]', __e); }
})();
(function(){
try {
var __m = "youtube.com";
var __re = new RegExp('^' + "youtube\\.com" + '
docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
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docs: final fork-budget numbers after #817#818

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#818
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
Loading

, 'i');
if (__m === '*' || __re.test(location.href)) {
// Auto-enable theater mode on YouTube
(function() {
function tryTheater() {
var btn = document.querySelector('button[aria-label="Theater mode"], ytd-player #player button[title="Theater mode"]');
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lastUrl = location.href;
setTimeout(tryTheater, 500);
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observer.observe(document.body, { childList: true, subtree: true });
})();
}
} catch(__e) { console.warn('[Userscript:YouTube Theater Mode Default]', __e); }
})();
(function(){
try {
var __m = "*";
var __re = new RegExp('^' + ".*" + '
docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
Skip to content
docs: final fork-budget numbers after #817#818

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#818
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
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docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
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docs: final fork-budget numbers after #817#818

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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

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Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
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docs: final fork-budget numbers after #817 by Chemaclass · Pull Request #818 · TypedDevs/bashunit · GitHub
Skip to content
docs: final fork-budget numbers after #817#818

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 Merged

Chemaclass
merged 1 commit into

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Jul 16, 2026
 Merged


docs: final fork-budget numbers after #817
#818
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21 changes: 13 additions & 8 deletions
.claude/rules/perf-fork-budget.md

View file


Open in desktop

Original file line numberDiff line numberDiff line change
Expand Up@@ -9,8 +9,10 @@ paths:
bashunit's dominant runtime cost on Bash 3.2 (macOS) is **process forks**, not
shell execution. A fork costs ~1-3ms; the acceptance suite spawns ~258 nested
`./bashunit` runs, so one avoidable fork per file or per test multiplies fast.
PRs #801-#811 removed the per-test and cold-start forks; this file records how
to measure and the traps found, so future work starts from evidence.
PRs #801-#817 removed the per-test, per-file and cold-start forks (the full
`--parallel` acceptance suite went from ~61s to ~17s wall, CPU time halved);
this file records how to measure and the traps found, so future work starts
from evidence.

## Measuring: shim census is ground truth, traces overcount

Expand DownExpand Up@@ -75,12 +77,15 @@ only** — toggling it in the caller's shell clobbers caller state (#808).

## Current budgets (Bash 3.2 macOS)

**Sequential 1-test file run:** ~3 `awk` (provider map ×2 — the counting
subshell can't share its cache with the runner — plus the duplicate check),
`perl` ×2 clock reads (start/end; no `EPOCHREALTIME` before Bash 5), 1 `base64`
capability probe, 1 `mkdir`, 1 `tput`. Per-test cost is fork-free. Cold start
~50ms, ~31ms of which is sourcing `src/` (irreducible without lazy-loading,
rejected in #798).
**Sequential 1-test file run:** 2 `awk` (provider map — built once in the main
shell since #817, the header count reads a return slot so the cache survives
into the runner — plus the duplicate check), `perl` ×2 clock reads (start/end;
no `EPOCHREALTIME` before Bash 5), 1 `base64` capability probe, 1 `mkdir`,
1 `tput`. Per-test cost is fork-free. Cold start ~45-50ms, ~31ms of which is
sourcing `src/` (irreducible without lazy-loading, rejected in #798).
`--coverage` adds ~3 forks per unique file first seen by the DEBUG trap
(decision-cache miss: grep|head + dirname) — bounded by file count, nightly
non-gating workflow, not worth chasing.

**Parallel 10-test file run (CI's mode):** ~21 forks — 10 `mktemp` (one per
test: the unique result file; deterministic names collide because different
Expand Down
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