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std.ArrayHashMap: base linear_scan_max on cache line size

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This commit is contained in:
Andrew Kelley 2025-02-11 11:37:12 -08:00
parent 58f928814d
commit 53216d2f22
1 changed files with 7 additions and 4 deletions
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11
lib/std/array_hash_map.zig
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@ -605,7 +605,10 @@ pub fn ArrayHashMapUnmanaged(
const Self = @This(); const Self = @This();
const linear_scan_max = 8; const linear_scan_max = @as(comptime_int, @max(1, @as(comptime_int, @min(
std.atomic.cache_line / @as(comptime_int, @max(1, @sizeOf(Hash))),
std.atomic.cache_line / @as(comptime_int, @max(1, @sizeOf(K))),
))));
const RemovalType = enum { const RemovalType = enum {
swap, swap,
@ -2393,7 +2396,7 @@ test "shrink" {
defer map.deinit(); defer map.deinit();
// This test is more interesting if we insert enough entries to allocate the index header. // This test is more interesting if we insert enough entries to allocate the index header.
const num_entries = 20; const num_entries = 200;
var i: i32 = 0; var i: i32 = 0;
while (i < num_entries) : (i += 1) while (i < num_entries) : (i += 1)
try testing.expect((try map.fetchPut(i, i * 10)) == null); try testing.expect((try map.fetchPut(i, i * 10)) == null);
@ -2404,7 +2407,7 @@ test "shrink" {
// Test `shrinkRetainingCapacity`. // Test `shrinkRetainingCapacity`.
map.shrinkRetainingCapacity(17); map.shrinkRetainingCapacity(17);
try testing.expect(map.count() == 17); try testing.expect(map.count() == 17);
try testing.expect(map.capacity() == 20); try testing.expect(map.capacity() >= num_entries);
i = 0; i = 0;
while (i < num_entries) : (i += 1) { while (i < num_entries) : (i += 1) {
const gop = try map.getOrPut(i); const gop = try map.getOrPut(i);
@ -2453,7 +2456,7 @@ test "reIndex" {
defer map.deinit(); defer map.deinit();
// Populate via the API. // Populate via the API.
const num_indexed_entries = 20; const num_indexed_entries = 200;
var i: i32 = 0; var i: i32 = 0;
while (i < num_indexed_entries) : (i += 1) while (i < num_indexed_entries) : (i += 1)
try testing.expect((try map.fetchPut(i, i * 10)) == null); try testing.expect((try map.fetchPut(i, i * 10)) == null);