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Shrink disk buckets index record (#21973) 

* Shrink index record

* Update bucket_map/src/index_entry.rs

Co-authored-by: Brooks Prumo <brooks@prumo.org>

Co-authored-by: Brooks Prumo <brooks@prumo.org>
This commit is contained in:
Jeff Washington (jwash) 2022-01-07 12:12:36 -06:00 committed by GitHub
parent c2389fc209
commit b11d3b5abf
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1 changed files with 18 additions and 11 deletions
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29
bucket_map/src/index_entry.rs
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@ -19,30 +19,38 @@ use {
pub struct IndexEntry {
pub key: Pubkey, // can this be smaller if we have reduced the keys into buckets already?
pub ref_count: RefCount, // can this be smaller? Do we ever need more than 4B refcounts?
storage_offset: u64, // smaller? since these are variably sized, this could get tricky. well, actually accountinfo is not variable sized...
// storage_offset_mask contains both storage_offset and storage_capacity_when_created_pow2
// see _MASK_ constants below
storage_offset_mask: u64, // smaller? since these are variably sized, this could get tricky. well, actually accountinfo is not variable sized...
// if the bucket doubled, the index can be recomputed using create_bucket_capacity_pow2
storage_capacity_when_created_pow2: u8, // see data_location
pub num_slots: Slot, // can this be smaller? epoch size should ~ be the max len. this is the num elements in the slot list
}
/// how many bits to shift the capacity value in the mask
const STORAGE_OFFSET_MASK_CAPACITY_SHIFT: u64 = (u64::BITS - u8::BITS) as u64;
/// mask to use on 'storage_offset_mask' to get the 'storage_offset' portion
const STORAGE_OFFSET_MASK_STORAGE_OFFSET: u64 = (1 << STORAGE_OFFSET_MASK_CAPACITY_SHIFT) - 1;
impl IndexEntry {
pub fn init(&mut self, pubkey: &Pubkey) {
self.key = *pubkey;
self.ref_count = 0;
self.storage_offset = 0;
self.storage_capacity_when_created_pow2 = 0;
self.storage_offset_mask = 0;
self.num_slots = 0;
}
pub fn set_storage_capacity_when_created_pow2(
&mut self,
storage_capacity_when_created_pow2: u8,
) {
self.storage_capacity_when_created_pow2 = storage_capacity_when_created_pow2;
self.storage_offset_mask = self.storage_offset()
| ((storage_capacity_when_created_pow2 as u64) << STORAGE_OFFSET_MASK_CAPACITY_SHIFT)
}
pub fn set_storage_offset(&mut self, storage_offset: u64) {
self.storage_offset = storage_offset;
let offset_mask = storage_offset & STORAGE_OFFSET_MASK_STORAGE_OFFSET;
assert_eq!(storage_offset, offset_mask, "offset too large");
self.storage_offset_mask = ((self.storage_capacity_when_created_pow2() as u64)
<< STORAGE_OFFSET_MASK_CAPACITY_SHIFT)
| offset_mask;
}
pub fn data_bucket_from_num_slots(num_slots: Slot) -> u64 {
@ -58,10 +66,10 @@ impl IndexEntry {
}
fn storage_offset(&self) -> u64 {
self.storage_offset
self.storage_offset_mask & STORAGE_OFFSET_MASK_STORAGE_OFFSET
}
fn storage_capacity_when_created_pow2(&self) -> u8 {
self.storage_capacity_when_created_pow2
(self.storage_offset_mask >> STORAGE_OFFSET_MASK_CAPACITY_SHIFT) as u8
}
// This function maps the original data location into an index in the current bucket storage.
@ -101,8 +109,7 @@ mod tests {
IndexEntry {
key,
ref_count: 0,
storage_offset: 0,
storage_capacity_when_created_pow2: 0,
storage_offset_mask: 0,
num_slots: 0,
}
}