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Diffstat (limited to 'doc/0/A-meta_alloc.md')
| -rw-r--r-- | doc/0/A-meta_alloc.md | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/doc/0/A-meta_alloc.md b/doc/0/A-meta_alloc.md index 45d851a..577f066 100644 --- a/doc/0/A-meta_alloc.md +++ b/doc/0/A-meta_alloc.md @@ -208,18 +208,19 @@ values used by the implementation are as follows: * Padding: 56 bytes -* Maximum count: 32 indexes +* Maximum count: 16 indexes * Smallest size class: 256 bytes -The extra index array starts after 64 bytes, and requires 128 bytes, -since it stores up to 32 4-byte integers; that gives us a total size -of 192, which fits in under 256 bytes. +The extra index array starts after 64 bytes, and requires 64 bytes, +since it stores up to 16 32-bit integers; that's a total size of 128, +which fits within 256, and means we could decrease the smallest size +to 128 as well if deemed more appropriate. The 64-byte padding is to allow for efficient bulk memory transfer using up to 512-bit SIMD instructions on modern processors. -Why we would need to bulk-transfer 32 index values will be explained +Why we would need to bulk-transfer 16 index values will be explained later, as we look into thread-local cache metadata. ## Per-thread metadata |