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search small libraries on the main thread to reduce wait times in barriers

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This commit is contained in:
Nikita Smith
2026-07-27 14:47:29 -07:00
committed by Ryan Fleury
parent db0151c3e2
commit 4235fa85b4
1 changed files with 36 additions and 1 deletions
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src/linker/lnk.c
+35
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@@ -1742,6 +1742,25 @@ THREAD_POOL_TASK_FUNC(lnk_search_lib_task)
lib->search_cursor_indices[task_id] = end_count;
}
internal U64
lnk_search_lib_task_work_count(LNK_SearchLibTask *task, U64 task_id)
{
LNK_Lib *lib = task->lib;
LNK_SymbolTable *symtab = task->symtab;
LNK_SymbolHashTrieChunk *start_chunk = task->reset_search_cursor ? 0 : lib->search_cursor_chunks[task_id];
U64 start_idx = task->reset_search_cursor ? 0 : lib->search_cursor_indices[task_id];
LNK_SymbolHashTrieChunk *end_chunk = symtab->search_chunks[task_id].last;
U64 end_count = end_chunk ? end_chunk->count : 0;
U64 work_count = 0;
for EachNode(c, LNK_SymbolHashTrieChunk, start_chunk ? start_chunk : symtab->search_chunks[task_id].first) {
U64 i_begin = (c == start_chunk) ? start_idx : 0;
U64 i_end = (c == end_chunk) ? end_count : c->count;
work_count += i_end - i_begin;
}
return work_count;
}
internal LNK_Lib *
lnk_find_first_crt_lib(LNK_Config *config, LNK_Inputer *inputer)
{
@@ -1899,7 +1918,23 @@ lnk_link_inputs(TP_Context *tp,
.lib_member_infos = lib_member_infos,
.member_ref_lists = member_ref_lists
};
enum { serial_work_limit = 16384 };
U64 search_work_count = 0;
for EachIndex(task_id, tp->worker_count) {
search_work_count += lnk_search_lib_task_work_count(&search_task, task_id);
if (search_work_count > serial_work_limit) {
break;
}
}
if (search_work_count <= serial_work_limit) {
// thread pool barrier waits dominate small library searches,
// search small tasks on the main thread
for EachIndex(task_id, tp->worker_count) {
lnk_search_lib_task(arena->v[0], 0, task_id, &search_task, tp);
}
} else {
tp_for_parallel(tp, arena, tp->worker_count, lnk_search_lib_task, &search_task);
}
// cache last search mode, if the mode changes then skipped weak anti-dependency must be searched again
lib->searched_anti_deps = search_anti_deps;