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Implement a minimum readback buffer

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This commit is contained in:
electricboogie 2021-04-25 19:07:24 -05:00
parent 32222c1ee7
commit fc899ffe7a
1 changed files with 14 additions and 5 deletions
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19
src/uu/sort/src/external_sort/mod.rs
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@ -212,13 +212,22 @@ where
}
// initialize buffers for each chunk
// iter.max_per_chunk = adjusted_buffer_size
// .checked_div(iter.chunks)
// .unwrap_or(adjusted_buffer_size);
//
//
// Having a right sized buffer for each chunk for smallish values seems silly to me?
//
iter.max_per_chunk = adjusted_buffer_size;
// We will have to have the entire iter in memory sometime right?
// Set minimum to the size of the writer buffer, ~8K
//
const MINIMUM_READBACK_BUFFER: u64 = 8200;
let right_sized_buffer = adjusted_buffer_size
.checked_div(iter.chunks)
.unwrap_or(adjusted_buffer_size);
iter.max_per_chunk =
if right_sized_buffer > MINIMUM_READBACK_BUFFER {
right_sized_buffer
} else {
MINIMUM_READBACK_BUFFER
};
iter.buffers = vec![VecDeque::new(); iter.chunks as usize];
iter.chunk_offsets = vec![0 as u64; iter.chunks as usize];
for chunk_num in 0..iter.chunks {