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docs/tasks/0141: switch dispatch measured, not built - #470
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Switch dispatch for body children and plain names (closed PR #468) traded +0.1..+1.35% Render instructions for fewer mispredicts in callgrind's last-target branch model only; the perf track rejected it. The write-up, the rejected wide variant, the header-inlining trap and the condition for reopening stay in the task file. Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018j47FUYwQ9s69rR6Jesrwc
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Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01KMcWcpGwhiaEs33YjAgEV4
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Claude-Session: https://claude.ai/code/session_01KMcWcpGwhiaEs33YjAgEV4 Co-authored-by: Claude <noreply@anthropic.com>
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Requested by Ruslan · project thread
Before: task 0141 (dispatch hot node kinds by a switch instead of virtual calls) was open and unmeasured.
After: 0141 is done as "measured, not built". The experiment in #468 (closed) cut simulated mispredicts by up to 71%, but only in callgrind's last-target branch model. It cost +0.1..+1.35% Render instructions, eight cases past the ±0.5% bar, so the perf track rejected it. The task file keeps the CI table, the branch-simulation figures, the rejected wide variant, the header-inlining trap (Load +1.22%), and the condition for reopening it: a gain of at least 3% wall time on a quiet machine with hardware counters.
How: docs-only, this task's file only; the index sync is the perf track's.
Roles: main session; the verifier ran one round on #468's code (ready). Red pushes on #468: none.
🤖 Generated with Claude Code
https://claude.ai/code/session_018j47FUYwQ9s69rR6Jesrwc