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Document the thread scheduler settings - #7832
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| Check name | Status | Explanation |
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| Description check |  |
The description accurately summarizes the documentation changes, configuration settings covered, corrected units and defaults, and the limited comment updates in config.hpp. |
| Title check | |
The title clearly and concisely describes the main change: documenting the thread scheduler settings. |
| Linked Issues check | |
Linked issue #7750 is closed and supplies historical context only. No active directly linked issue supplies coding requirements. The documented scheduler settings and corrected comments therefore have… |
| Out of Scope Changes check | |
The changes add scheduler documentation, update configuration tables, and correct two configuration comments. These changes match the current PR description. The summary shows no unrelated implementat… |
| Docstring Coverage | |
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1… |
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Linked issue
#7750is closed and supplies historical context only. No active directly linked issue supplies coding requirements. The documented scheduler settings and corrected comments therefore have no unmet linked-issue requirement.
Full details: Out of Scope Changes check
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The changes add scheduler documentation, update configuration tables, and correct two configuration comments. These changes match the current PR description. The summary shows no unrelated implementation changes.
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No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 1 files. (1 skipped: 1 unsupported.)
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Actionable comments posted: 3
- 🪄 Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @docs/sphinx/manual/thread_scheduler_configuration.rst:
- Around line 303-304: Clarify the runtime scheduler-mode guidance near
hpx::threads::add_scheduler_mode, remove_scheduler_mode, and set_scheduler_mode:
changing do_background_work on a running pool does not start or stop background
work because the worker captures that decision when its scheduling loop starts.
State that this setting must not be relied on to control polling through a live
mode change.
- Around line 115-117: Update the fast idle description in the
thread_scheduler_modes section to say that fast idle removes the idle-loop delay
for staged stealing while preserving min_tasks_to_steal_pending and
min_tasks_to_steal_staged; work remains unavailable when either minimum exceeds
the victim queue length.
- Around line 433-435: Update the idle loop count description to preserve that
idle backoff does not reset it, while clarifying that background work resets it
when callbacks.background_() returns true with the background thread active.
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📒 Files selected for processing: 4
docs/sphinx/manual.rstdocs/sphinx/manual/launching_and_configuring_hpx_applications.rstdocs/sphinx/manual/thread_scheduler_configuration.rstlibs/core/config/include/hpx/config.hpp
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Add the manual section "Configuring and tuning the thread schedulers": how a worker thread finds work, all settings that influence it, the scheduler modes, which scheduler uses which setting, how the settings depend on each other, and tuning hints. Complete the [hpx] and [hpx.thread_queue] settings tables, and fix the unit of hpx.max_idle_backoff_time (microseconds) and the description of hpx.max_busy_loop_count in the docs and config.hpp. Signed-off-by: Hartmut Kaiser <[email protected]>
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Signed-off-by: Hartmut Kaiser <[email protected]>
Proposed Changes
docs/sphinx/manual/thread_scheduler_configuration.rst): how a worker thread finds work, all settings that influence it (pending and staged stealing, conversion of staged tasks, idle backoff, background work, thread object recycling, NUMA), the scheduler modes, which scheduler uses which setting, how the settings depend on each other, and tuning hints.[hpx]and[hpx.thread_queue]sections in "Launching and configuring HPX applications" now list all keys (hpx.scheduler,hpx.numa_sensitive,hpx.default_scheduler_mode,max_thread_count,min_delete_count,max_terminated_threads,init_threads_count,cached_threads_countwere missing) and describe what each one does.hpx.max_idle_backoff_timeis in microseconds, not milliseconds;hpx.max_background_threadsdefaults tohpx.os_threads.HPX_BUSY_LOOP_COUNT_MAXandHPX_IDLE_BACKOFF_TIME_MAXinconfig.hppare fixed accordingly.Any background context you want to provide?
Documentation only, no code changes (apart from two comments in
config.hpp).The text describes master as of eaff5b9, i.e. after the scheduler fixes #7750-#7757 and #7771: the three
hpx.numa_sensitivelevels with default 1, the work-requesting schedulers always running in fast idle mode and honoringmin_tasks_to_steal_pending, the modes some schedulers enforce, andmin_add_new_countbeing limited tomax_add_new_count. Each statement was checked against the code.A follow-up PR for the local priority queue scheduler (pending stealing gate) will add its two new settings to these pages.
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