| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/git/checkouts/tantivy-65d0bbbddbbd5d02/433372d/src/postings/stacker/expull.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>expull.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../../../normalize.css"><link rel="stylesheet" href="../../../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../../../ayu.css" disabled><link rel="stylesheet" href="../../../../dark.css" disabled><link rel="stylesheet" href="../../../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../../../storage.js"></script><script defer src="../../../../source-script.js"></script><script defer src="../../../../source-files.js"></script><script defer src="../../../../main.js"></script><noscript><link rel="stylesheet" href="../../../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../../../tantivy/index.html"><div class="logo-container"> |
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| </pre><pre class="rust"><code><span class="kw">use </span>std::mem; |
| |
| <span class="kw">use </span>common::serialize_vint_u32; |
| |
| <span class="kw">use super</span>::{Addr, MemoryArena}; |
| <span class="kw">use </span><span class="kw">crate</span>::postings::stacker::memory_arena::{load, store}; |
| |
| <span class="kw">const </span>MAX_BLOCK_LEN: u32 = <span class="number">1u32 </span><< <span class="number">15</span>; |
| <span class="kw">const </span>FIRST_BLOCK: usize = <span class="number">16</span>; |
| <span class="kw">const </span>INLINED_BLOCK_LEN: usize = FIRST_BLOCK + mem::size_of::<Addr>(); |
| |
| <span class="kw">enum </span>CapacityResult { |
| Available(u32), |
| NeedAlloc(u32), |
| } |
| |
| <span class="kw">fn </span>len_to_capacity(len: u32) -> CapacityResult { |
| <span class="kw">match </span>len { |
| <span class="number">0</span>..=<span class="number">15 </span>=> CapacityResult::Available(FIRST_BLOCK <span class="kw">as </span>u32 - len), |
| <span class="number">16</span>..=MAX_BLOCK_LEN => { |
| <span class="kw">let </span>cap = <span class="number">1 </span><< (<span class="number">32u32 </span>- (len - <span class="number">1u32</span>).leading_zeros()); |
| <span class="kw">let </span>available = cap - len; |
| <span class="kw">if </span>available == <span class="number">0 </span>{ |
| CapacityResult::NeedAlloc(len) |
| } <span class="kw">else </span>{ |
| CapacityResult::Available(available) |
| } |
| } |
| n => { |
| <span class="kw">let </span>available = n % MAX_BLOCK_LEN; |
| <span class="kw">if </span>available == <span class="number">0 </span>{ |
| CapacityResult::NeedAlloc(MAX_BLOCK_LEN) |
| } <span class="kw">else </span>{ |
| CapacityResult::Available(MAX_BLOCK_LEN - available) |
| } |
| } |
| } |
| } |
| |
| <span class="doccomment">/// An exponential unrolled link. |
| /// |
| /// The use case is as follows. Tantivy's indexer conceptually acts like a |
| /// `HashMap<Term, Vec<u32>>`. As we come across a given term in document |
| /// `D`, we lookup the term in the map and append the document id to its vector. |
| /// |
| /// The vector is then only read when it is serialized. |
| /// |
| /// The `ExpUnrolledLinkedList` offers a more efficient solution to this |
| /// problem. |
| /// |
| /// It combines the idea of the unrolled linked list and tries to address the |
| /// problem of selecting an adequate block size using a strategy similar to |
| /// that of the `Vec` amortized resize strategy. |
| /// |
| /// Data is stored in a linked list of blocks. The first block has a size of `4` |
| /// and each block has a length of twice that of the previous block up to |
| /// `MAX_BLOCK_LEN = 32768`. |
| /// |
| /// This strategy is a good trade off to handle numerous very rare terms |
| /// and avoid wasting half of the memory for very frequent terms. |
| </span><span class="attribute">#[derive(Debug, Clone, Copy)] |
| </span><span class="kw">pub struct </span>ExpUnrolledLinkedList { |
| len: u32, |
| tail: Addr, |
| inlined_data: [u8; INLINED_BLOCK_LEN <span class="kw">as </span>usize], |
| } |
| |
| <span class="kw">pub struct </span>ExpUnrolledLinkedListWriter<<span class="lifetime">'a</span>> { |
| eull: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>ExpUnrolledLinkedList, |
| arena: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>MemoryArena, |
| } |
| |
| <span class="kw">fn </span>ensure_capacity<<span class="lifetime">'a</span>>( |
| eull: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>ExpUnrolledLinkedList, |
| arena: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>MemoryArena, |
| ) -> <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>[u8] { |
| <span class="kw">if </span>eull.len <= FIRST_BLOCK <span class="kw">as </span>u32 { |
| <span class="comment">// We are still hitting the inline block. |
| </span><span class="kw">if </span>eull.len < FIRST_BLOCK <span class="kw">as </span>u32 { |
| <span class="kw">return </span><span class="kw-2">&mut </span>eull.inlined_data[eull.len <span class="kw">as </span>usize..FIRST_BLOCK]; |
| } |
| <span class="comment">// We need to allocate a new block! |
| </span><span class="kw">let </span>new_block_addr: Addr = arena.allocate_space(FIRST_BLOCK + mem::size_of::<Addr>()); |
| store(<span class="kw-2">&mut </span>eull.inlined_data[FIRST_BLOCK..], new_block_addr); |
| eull.tail = new_block_addr; |
| <span class="kw">return </span>arena.slice_mut(eull.tail, FIRST_BLOCK); |
| } |
| <span class="kw">let </span>len = <span class="kw">match </span>len_to_capacity(eull.len) { |
| CapacityResult::NeedAlloc(new_block_len) => { |
| <span class="kw">let </span>new_block_addr: Addr = |
| arena.allocate_space(new_block_len <span class="kw">as </span>usize + mem::size_of::<Addr>()); |
| arena.write_at(eull.tail, new_block_addr); |
| eull.tail = new_block_addr; |
| new_block_len |
| } |
| CapacityResult::Available(available) => available, |
| }; |
| arena.slice_mut(eull.tail, len <span class="kw">as </span>usize) |
| } |
| |
| <span class="kw">impl</span><<span class="lifetime">'a</span>> ExpUnrolledLinkedListWriter<<span class="lifetime">'a</span>> { |
| <span class="kw">pub fn </span>write_u32_vint(<span class="kw-2">&mut </span><span class="self">self</span>, val: u32) { |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = [<span class="number">0u8</span>; <span class="number">8</span>]; |
| <span class="kw">let </span>data = serialize_vint_u32(val, <span class="kw-2">&mut </span>buf); |
| <span class="self">self</span>.extend_from_slice(data); |
| } |
| |
| <span class="kw">pub fn </span>extend_from_slice(<span class="kw-2">&mut </span><span class="self">self</span>, <span class="kw-2">mut </span>buf: <span class="kw-2">&</span>[u8]) { |
| <span class="kw">while </span>!buf.is_empty() { |
| <span class="kw">let </span>add_len: usize; |
| { |
| <span class="kw">let </span>output_buf = ensure_capacity(<span class="self">self</span>.eull, <span class="self">self</span>.arena); |
| add_len = buf.len().min(output_buf.len()); |
| output_buf[..add_len].copy_from_slice(<span class="kw-2">&</span>buf[..add_len]); |
| } |
| <span class="self">self</span>.eull.len += add_len <span class="kw">as </span>u32; |
| <span class="self">self</span>.eull.tail = <span class="self">self</span>.eull.tail.offset(add_len <span class="kw">as </span>u32); |
| buf = <span class="kw-2">&</span>buf[add_len..]; |
| } |
| } |
| } |
| |
| <span class="kw">impl </span>ExpUnrolledLinkedList { |
| <span class="kw">pub fn </span>new() -> ExpUnrolledLinkedList { |
| ExpUnrolledLinkedList { |
| len: <span class="number">0u32</span>, |
| tail: Addr::null_pointer(), |
| inlined_data: [<span class="number">0u8</span>; INLINED_BLOCK_LEN <span class="kw">as </span>usize], |
| } |
| } |
| |
| <span class="attribute">#[inline] |
| </span><span class="kw">pub fn </span>writer<<span class="lifetime">'a</span>>(<span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span><span class="self">self</span>, arena: <span class="kw-2">&</span><span class="lifetime">'a </span><span class="kw-2">mut </span>MemoryArena) -> ExpUnrolledLinkedListWriter<<span class="lifetime">'a</span>> { |
| ExpUnrolledLinkedListWriter { eull: <span class="self">self</span>, arena } |
| } |
| |
| <span class="kw">pub fn </span>read_to_end(<span class="kw-2">&</span><span class="self">self</span>, arena: <span class="kw-2">&</span>MemoryArena, output: <span class="kw-2">&mut </span>Vec<u8>) { |
| <span class="kw">let </span>len = <span class="self">self</span>.len <span class="kw">as </span>usize; |
| <span class="kw">if </span>len <= FIRST_BLOCK { |
| output.extend_from_slice(<span class="kw-2">&</span><span class="self">self</span>.inlined_data[..len]); |
| <span class="kw">return</span>; |
| } |
| output.extend_from_slice(<span class="kw-2">&</span><span class="self">self</span>.inlined_data[..FIRST_BLOCK]); |
| <span class="kw">let </span><span class="kw-2">mut </span>cur = FIRST_BLOCK; |
| <span class="kw">let </span><span class="kw-2">mut </span>addr = load(<span class="kw-2">&</span><span class="self">self</span>.inlined_data[FIRST_BLOCK..]); |
| <span class="kw">loop </span>{ |
| <span class="kw">let </span>cap = <span class="kw">match </span>len_to_capacity(cur <span class="kw">as </span>u32) { |
| CapacityResult::Available(capacity) => capacity, |
| CapacityResult::NeedAlloc(capacity) => capacity, |
| } <span class="kw">as </span>usize; |
| <span class="kw">let </span>data = arena.slice(addr, cap); |
| <span class="kw">if </span>cur + cap >= len { |
| output.extend_from_slice(<span class="kw-2">&</span>data[..(len - cur)]); |
| <span class="kw">return</span>; |
| } |
| output.extend_from_slice(data); |
| cur += cap; |
| addr = arena.read(addr.offset(cap <span class="kw">as </span>u32)); |
| } |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">use </span>common::{read_u32_vint, write_u32_vint}; |
| |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::MemoryArena; |
| <span class="kw">use super</span>::{len_to_capacity, <span class="kw-2">*</span>}; |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_eull() { |
| <span class="kw">let </span><span class="kw-2">mut </span>arena = MemoryArena::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = ExpUnrolledLinkedList::new(); |
| stack.writer(<span class="kw-2">&mut </span>arena).extend_from_slice(<span class="kw-2">&</span>[<span class="number">1u8</span>]); |
| stack.writer(<span class="kw-2">&mut </span>arena).extend_from_slice(<span class="kw-2">&</span>[<span class="number">2u8</span>]); |
| stack.writer(<span class="kw-2">&mut </span>arena).extend_from_slice(<span class="kw-2">&</span>[<span class="number">3u8</span>, <span class="number">4u8</span>]); |
| stack.writer(<span class="kw-2">&mut </span>arena).extend_from_slice(<span class="kw-2">&</span>[<span class="number">5u8</span>]); |
| { |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = Vec::new(); |
| stack.read_to_end(<span class="kw-2">&</span>arena, <span class="kw-2">&mut </span>buffer); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>buffer[..], <span class="kw-2">&</span>[<span class="number">1u8</span>, <span class="number">2u8</span>, <span class="number">3u8</span>, <span class="number">4u8</span>, <span class="number">5u8</span>]); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_eull_long() { |
| <span class="kw">let </span><span class="kw-2">mut </span>arena = MemoryArena::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>eull = ExpUnrolledLinkedList::new(); |
| <span class="kw">let </span>data: Vec<u32> = (<span class="number">0</span>..<span class="number">100</span>).collect(); |
| <span class="kw">for </span><span class="kw-2">&</span>el <span class="kw">in </span><span class="kw-2">&</span>data { |
| eull.writer(<span class="kw-2">&mut </span>arena).write_u32_vint(el); |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>buffer = Vec::new(); |
| eull.read_to_end(<span class="kw-2">&</span>arena, <span class="kw-2">&mut </span>buffer); |
| <span class="kw">let </span><span class="kw-2">mut </span>result = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>remaining = <span class="kw-2">&</span>buffer[..]; |
| <span class="kw">while </span>!remaining.is_empty() { |
| result.push(read_u32_vint(<span class="kw-2">&mut </span>remaining)); |
| } |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>result[..], <span class="kw-2">&</span>data[..]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_eull_interlaced() { |
| <span class="kw">let </span><span class="kw-2">mut </span>eull = MemoryArena::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack = ExpUnrolledLinkedList::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stack2 = ExpUnrolledLinkedList::new(); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>vec1: Vec<u8> = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>vec2: Vec<u8> = <span class="macro">vec!</span>[]; |
| |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">9 </span>{ |
| stack.writer(<span class="kw-2">&mut </span>eull).write_u32_vint(i); |
| <span class="macro">assert!</span>(write_u32_vint(i, <span class="kw-2">&mut </span>vec1).is_ok()); |
| <span class="kw">if </span>i % <span class="number">2 </span>== <span class="number">0 </span>{ |
| stack2.writer(<span class="kw-2">&mut </span>eull).write_u32_vint(i); |
| <span class="macro">assert!</span>(write_u32_vint(i, <span class="kw-2">&mut </span>vec2).is_ok()); |
| } |
| } |
| <span class="kw">let </span><span class="kw-2">mut </span>res1 = <span class="macro">vec!</span>[]; |
| <span class="kw">let </span><span class="kw-2">mut </span>res2 = <span class="macro">vec!</span>[]; |
| stack.read_to_end(<span class="kw-2">&</span>eull, <span class="kw-2">&mut </span>res1); |
| stack2.read_to_end(<span class="kw-2">&</span>eull, <span class="kw-2">&mut </span>res2); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>vec1[..], <span class="kw-2">&</span>res1[..]); |
| <span class="macro">assert_eq!</span>(<span class="kw-2">&</span>vec2[..], <span class="kw-2">&</span>res2[..]); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_jump_if_needed() { |
| <span class="kw">let </span><span class="kw-2">mut </span>available = <span class="number">16u32</span>; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..<span class="number">10_000_000 </span>{ |
| <span class="kw">match </span>len_to_capacity(i) { |
| CapacityResult::NeedAlloc(cap) => { |
| <span class="macro">assert_eq!</span>(available, <span class="number">0</span>, <span class="string">"Failed len={}: Expected 0 got {}"</span>, i, cap); |
| available = cap; |
| } |
| CapacityResult::Available(cap) => { |
| <span class="macro">assert_eq!</span>( |
| available, cap, |
| <span class="string">"Failed len={}: Expected {} Got {}"</span>, |
| i, available, cap |
| ); |
| } |
| } |
| available -= <span class="number">1</span>; |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_jump_if_needed_progression() { |
| <span class="kw">let </span><span class="kw-2">mut </span>v = <span class="macro">vec!</span>[]; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>.. { |
| <span class="kw">if </span>v.len() >= <span class="number">10 </span>{ |
| <span class="kw">break</span>; |
| } |
| <span class="kw">if let </span>CapacityResult::NeedAlloc(cap) = len_to_capacity(i) { |
| v.push((i, cap)); |
| } |
| } |
| <span class="macro">assert_eq!</span>( |
| <span class="kw-2">&</span>v[..], |
| <span class="kw-2">&</span>[ |
| (<span class="number">16</span>, <span class="number">16</span>), |
| (<span class="number">32</span>, <span class="number">32</span>), |
| (<span class="number">64</span>, <span class="number">64</span>), |
| (<span class="number">128</span>, <span class="number">128</span>), |
| (<span class="number">256</span>, <span class="number">256</span>), |
| (<span class="number">512</span>, <span class="number">512</span>), |
| (<span class="number">1024</span>, <span class="number">1024</span>), |
| (<span class="number">2048</span>, <span class="number">2048</span>), |
| (<span class="number">4096</span>, <span class="number">4096</span>), |
| (<span class="number">8192</span>, <span class="number">8192</span>) |
| ] |
| ); |
| } |
| } |
| |
| <span class="attribute">#[cfg(all(test, feature = <span class="string">"unstable"</span>))] |
| </span><span class="kw">mod </span>bench { |
| <span class="kw">use </span>std::iter; |
| |
| <span class="kw">use </span>test::Bencher; |
| |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::MemoryArena; |
| <span class="kw">use </span><span class="kw">super</span>::ExpUnrolledLinkedList; |
| |
| <span class="kw">const </span>NUM_STACK: usize = <span class="number">10_000</span>; |
| <span class="kw">const </span>STACK_SIZE: u32 = <span class="number">1000</span>; |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_push_vec(bench: <span class="kw-2">&mut </span>Bencher) { |
| bench.iter(|| { |
| <span class="kw">let </span><span class="kw-2">mut </span>vecs = Vec::with_capacity(<span class="number">100</span>); |
| <span class="kw">for _ in </span><span class="number">0</span>..NUM_STACK { |
| vecs.push(Vec::new()); |
| } |
| <span class="kw">for </span>s <span class="kw">in </span><span class="number">0</span>..NUM_STACK { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0u32</span>..STACK_SIZE { |
| <span class="kw">let </span>t = s * <span class="number">392017 </span>% NUM_STACK; |
| vecs[t].push(i); |
| } |
| } |
| }); |
| } |
| |
| <span class="attribute">#[bench] |
| </span><span class="kw">fn </span>bench_push_stack(bench: <span class="kw-2">&mut </span>Bencher) { |
| bench.iter(|| { |
| <span class="kw">let </span><span class="kw-2">mut </span>arena = MemoryArena::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>stacks: Vec<ExpUnrolledLinkedList> = |
| iter::repeat_with(ExpUnrolledLinkedList::new) |
| .take(NUM_STACK) |
| .collect(); |
| <span class="kw">for </span>s <span class="kw">in </span><span class="number">0</span>..NUM_STACK { |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0u32</span>..STACK_SIZE { |
| <span class="kw">let </span>t = s * <span class="number">392017 </span>% NUM_STACK; |
| stacks[t] |
| .writer(<span class="kw-2">&mut </span>arena) |
| .extend_from_slice(<span class="kw-2">&</span>i.to_ne_bytes()); |
| } |
| } |
| }); |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../../../" data-current-crate="tantivy" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
