2 files changed, 948 insertions, 0 deletions
diff --git a/third_party/rust/indexmap/benches/bench.rs b/third_party/rust/indexmap/benches/bench.rs
new file mode 100644
index 0000000000..a4e8e21bc2
--- /dev/null
+++ b/third_party/rust/indexmap/benches/bench.rs
@@ -0,0 +1,763 @@
+#![feature(test)]
+
+extern crate test;
+#[macro_use]
+extern crate lazy_static;
+
+use fnv::FnvHasher;
+use std::hash::BuildHasherDefault;
+use std::hash::Hash;
+type FnvBuilder = BuildHasherDefault<FnvHasher>;
+
+use test::black_box;
+use test::Bencher;
+
+use indexmap::IndexMap;
+
+use std::collections::HashMap;
+
+use rand::rngs::SmallRng;
+use rand::seq::SliceRandom;
+use rand::SeedableRng;
+
+/// Use a consistently seeded Rng for benchmark stability
+fn small_rng() -> SmallRng {
+    let seed = u64::from_le_bytes(*b"indexmap");
+    SmallRng::seed_from_u64(seed)
+}
+
+#[bench]
+fn new_hashmap(b: &mut Bencher) {
+    b.iter(|| HashMap::<String, String>::new());
+}
+
+#[bench]
+fn new_indexmap(b: &mut Bencher) {
+    b.iter(|| IndexMap::<String, String>::new());
+}
+
+#[bench]
+fn with_capacity_10e5_hashmap(b: &mut Bencher) {
+    b.iter(|| HashMap::<String, String>::with_capacity(10_000));
+}
+
+#[bench]
+fn with_capacity_10e5_indexmap(b: &mut Bencher) {
+    b.iter(|| IndexMap::<String, String>::with_capacity(10_000));
+}
+
+#[bench]
+fn insert_hashmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_string_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x.to_string(), ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_string_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x.to_string(), ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_str_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let ss = Vec::from_iter((0..c).map(|x| x.to_string()));
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for key in &ss {
+            map.insert(&key[..], ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_str_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let ss = Vec::from_iter((0..c).map(|x| x.to_string()));
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for key in &ss {
+            map.insert(&key[..], ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_int_bigvalue_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let value = [0u64; 10];
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for i in 0..c {
+            map.insert(i, value);
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_int_bigvalue_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let value = [0u64; 10];
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for i in 0..c {
+            map.insert(i, value);
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_100_000(b: &mut Bencher) {
+    let c = 100_000;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_100_000(b: &mut Bencher) {
+    let c = 100_000;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_150(b: &mut Bencher) {
+    let c = 150;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_150(b: &mut Bencher) {
+    let c = 150;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x, ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn entry_hashmap_150(b: &mut Bencher) {
+    let c = 150;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.entry(x).or_insert(());
+        }
+        map
+    });
+}
+
+#[bench]
+fn entry_indexmap_150(b: &mut Bencher) {
+    let c = 150;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.entry(x).or_insert(());
+        }
+        map
+    });
+}
+
+#[bench]
+fn iter_sum_hashmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let len = c - c / 10;
+    for x in 0..len {
+        map.insert(x, ());
+    }
+    assert_eq!(map.len(), len);
+    b.iter(|| map.keys().sum::<usize>());
+}
+
+#[bench]
+fn iter_sum_indexmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let len = c - c / 10;
+    for x in 0..len {
+        map.insert(x, ());
+    }
+    assert_eq!(map.len(), len);
+    b.iter(|| map.keys().sum::<usize>());
+}
+
+#[bench]
+fn iter_black_box_hashmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let len = c - c / 10;
+    for x in 0..len {
+        map.insert(x, ());
+    }
+    assert_eq!(map.len(), len);
+    b.iter(|| {
+        for &key in map.keys() {
+            black_box(key);
+        }
+    });
+}
+
+#[bench]
+fn iter_black_box_indexmap_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let len = c - c / 10;
+    for x in 0..len {
+        map.insert(x, ());
+    }
+    assert_eq!(map.len(), len);
+    b.iter(|| {
+        for &key in map.keys() {
+            black_box(key);
+        }
+    });
+}
+
+fn shuffled_keys<I>(iter: I) -> Vec<I::Item>
+where
+    I: IntoIterator,
+{
+    let mut v = Vec::from_iter(iter);
+    let mut rng = small_rng();
+    v.shuffle(&mut rng);
+    v
+}
+
+#[bench]
+fn lookup_hashmap_10_000_exist(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key, 1);
+    }
+    b.iter(|| {
+        let mut found = 0;
+        for key in 5000..c {
+            found += map.get(&key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_hashmap_10_000_noexist(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key, 1);
+    }
+    b.iter(|| {
+        let mut found = 0;
+        for key in c..15000 {
+            found += map.get(&key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_10_000_exist(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key, 1);
+    }
+    b.iter(|| {
+        let mut found = 0;
+        for key in 5000..c {
+            found += map.get(&key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_10_000_noexist(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key, 1);
+    }
+    b.iter(|| {
+        let mut found = 0;
+        for key in c..15000 {
+            found += map.get(&key).is_some() as i32;
+        }
+        found
+    });
+}
+
+// number of items to look up
+const LOOKUP_MAP_SIZE: u32 = 100_000_u32;
+const LOOKUP_SAMPLE_SIZE: u32 = 5000;
+const SORT_MAP_SIZE: usize = 10_000;
+
+// use lazy_static so that comparison benchmarks use the exact same inputs
+lazy_static! {
+    static ref KEYS: Vec<u32> = shuffled_keys(0..LOOKUP_MAP_SIZE);
+}
+
+lazy_static! {
+    static ref HMAP_100K: HashMap<u32, u32> = {
+        let c = LOOKUP_MAP_SIZE;
+        let mut map = HashMap::with_capacity(c as usize);
+        let keys = &*KEYS;
+        for &key in keys {
+            map.insert(key, key);
+        }
+        map
+    };
+}
+
+lazy_static! {
+    static ref IMAP_100K: IndexMap<u32, u32> = {
+        let c = LOOKUP_MAP_SIZE;
+        let mut map = IndexMap::with_capacity(c as usize);
+        let keys = &*KEYS;
+        for &key in keys {
+            map.insert(key, key);
+        }
+        map
+    };
+}
+
+lazy_static! {
+    static ref IMAP_SORT_U32: IndexMap<u32, u32> = {
+        let mut map = IndexMap::with_capacity(SORT_MAP_SIZE);
+        for &key in &KEYS[..SORT_MAP_SIZE] {
+            map.insert(key, key);
+        }
+        map
+    };
+}
+lazy_static! {
+    static ref IMAP_SORT_S: IndexMap<String, String> = {
+        let mut map = IndexMap::with_capacity(SORT_MAP_SIZE);
+        for &key in &KEYS[..SORT_MAP_SIZE] {
+            map.insert(format!("{:^16x}", &key), String::new());
+        }
+        map
+    };
+}
+
+#[bench]
+fn lookup_hashmap_100_000_multi(b: &mut Bencher) {
+    let map = &*HMAP_100K;
+    b.iter(|| {
+        let mut found = 0;
+        for key in 0..LOOKUP_SAMPLE_SIZE {
+            found += map.get(&key).is_some() as u32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_100_000_multi(b: &mut Bencher) {
+    let map = &*IMAP_100K;
+    b.iter(|| {
+        let mut found = 0;
+        for key in 0..LOOKUP_SAMPLE_SIZE {
+            found += map.get(&key).is_some() as u32;
+        }
+        found
+    });
+}
+
+// inorder: Test looking up keys in the same order as they were inserted
+#[bench]
+fn lookup_hashmap_100_000_inorder_multi(b: &mut Bencher) {
+    let map = &*HMAP_100K;
+    let keys = &*KEYS;
+    b.iter(|| {
+        let mut found = 0;
+        for key in &keys[0..LOOKUP_SAMPLE_SIZE as usize] {
+            found += map.get(key).is_some() as u32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_100_000_inorder_multi(b: &mut Bencher) {
+    let map = &*IMAP_100K;
+    let keys = &*KEYS;
+    b.iter(|| {
+        let mut found = 0;
+        for key in &keys[0..LOOKUP_SAMPLE_SIZE as usize] {
+            found += map.get(key).is_some() as u32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_hashmap_100_000_single(b: &mut Bencher) {
+    let map = &*HMAP_100K;
+    let mut iter = (0..LOOKUP_MAP_SIZE + LOOKUP_SAMPLE_SIZE).cycle();
+    b.iter(|| {
+        let key = iter.next().unwrap();
+        map.get(&key).is_some()
+    });
+}
+
+#[bench]
+fn lookup_indexmap_100_000_single(b: &mut Bencher) {
+    let map = &*IMAP_100K;
+    let mut iter = (0..LOOKUP_MAP_SIZE + LOOKUP_SAMPLE_SIZE).cycle();
+    b.iter(|| {
+        let key = iter.next().unwrap();
+        map.get(&key).is_some()
+    });
+}
+
+const GROW_SIZE: usize = 100_000;
+type GrowKey = u32;
+
+// Test grow/resize without preallocation
+#[bench]
+fn grow_fnv_hashmap_100_000(b: &mut Bencher) {
+    b.iter(|| {
+        let mut map: HashMap<_, _, FnvBuilder> = HashMap::default();
+        for x in 0..GROW_SIZE {
+            map.insert(x as GrowKey, x as GrowKey);
+        }
+        map
+    });
+}
+
+#[bench]
+fn grow_fnv_indexmap_100_000(b: &mut Bencher) {
+    b.iter(|| {
+        let mut map: IndexMap<_, _, FnvBuilder> = IndexMap::default();
+        for x in 0..GROW_SIZE {
+            map.insert(x as GrowKey, x as GrowKey);
+        }
+        map
+    });
+}
+
+const MERGE: u64 = 10_000;
+#[bench]
+fn hashmap_merge_simple(b: &mut Bencher) {
+    let first_map: HashMap<u64, _> = (0..MERGE).map(|i| (i, ())).collect();
+    let second_map: HashMap<u64, _> = (MERGE..MERGE * 2).map(|i| (i, ())).collect();
+    b.iter(|| {
+        let mut merged = first_map.clone();
+        merged.extend(second_map.iter().map(|(&k, &v)| (k, v)));
+        merged
+    });
+}
+
+#[bench]
+fn hashmap_merge_shuffle(b: &mut Bencher) {
+    let first_map: HashMap<u64, _> = (0..MERGE).map(|i| (i, ())).collect();
+    let second_map: HashMap<u64, _> = (MERGE..MERGE * 2).map(|i| (i, ())).collect();
+    let mut v = Vec::new();
+    let mut rng = small_rng();
+    b.iter(|| {
+        let mut merged = first_map.clone();
+        v.extend(second_map.iter().map(|(&k, &v)| (k, v)));
+        v.shuffle(&mut rng);
+        merged.extend(v.drain(..));
+
+        merged
+    });
+}
+
+#[bench]
+fn indexmap_merge_simple(b: &mut Bencher) {
+    let first_map: IndexMap<u64, _> = (0..MERGE).map(|i| (i, ())).collect();
+    let second_map: IndexMap<u64, _> = (MERGE..MERGE * 2).map(|i| (i, ())).collect();
+    b.iter(|| {
+        let mut merged = first_map.clone();
+        merged.extend(second_map.iter().map(|(&k, &v)| (k, v)));
+        merged
+    });
+}
+
+#[bench]
+fn indexmap_merge_shuffle(b: &mut Bencher) {
+    let first_map: IndexMap<u64, _> = (0..MERGE).map(|i| (i, ())).collect();
+    let second_map: IndexMap<u64, _> = (MERGE..MERGE * 2).map(|i| (i, ())).collect();
+    let mut v = Vec::new();
+    let mut rng = small_rng();
+    b.iter(|| {
+        let mut merged = first_map.clone();
+        v.extend(second_map.iter().map(|(&k, &v)| (k, v)));
+        v.shuffle(&mut rng);
+        merged.extend(v.drain(..));
+
+        merged
+    });
+}
+
+#[bench]
+fn swap_remove_indexmap_100_000(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+    let mut keys = Vec::from_iter(map.keys().copied());
+    let mut rng = small_rng();
+    keys.shuffle(&mut rng);
+
+    b.iter(|| {
+        let mut map = map.clone();
+        for key in &keys {
+            map.swap_remove(key);
+        }
+        assert_eq!(map.len(), 0);
+        map
+    });
+}
+
+#[bench]
+fn shift_remove_indexmap_100_000_few(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+    let mut keys = Vec::from_iter(map.keys().copied());
+    let mut rng = small_rng();
+    keys.shuffle(&mut rng);
+    keys.truncate(50);
+
+    b.iter(|| {
+        let mut map = map.clone();
+        for key in &keys {
+            map.shift_remove(key);
+        }
+        assert_eq!(map.len(), IMAP_100K.len() - keys.len());
+        map
+    });
+}
+
+#[bench]
+fn shift_remove_indexmap_2_000_full(b: &mut Bencher) {
+    let mut keys = KEYS[..2_000].to_vec();
+    let mut map = IndexMap::with_capacity(keys.len());
+    for &key in &keys {
+        map.insert(key, key);
+    }
+    let mut rng = small_rng();
+    keys.shuffle(&mut rng);
+
+    b.iter(|| {
+        let mut map = map.clone();
+        for key in &keys {
+            map.shift_remove(key);
+        }
+        assert_eq!(map.len(), 0);
+        map
+    });
+}
+
+#[bench]
+fn pop_indexmap_100_000(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        while !map.is_empty() {
+            map.pop();
+        }
+        assert_eq!(map.len(), 0);
+        map
+    });
+}
+
+#[bench]
+fn few_retain_indexmap_100_000(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 7 == 0);
+        map
+    });
+}
+
+#[bench]
+fn few_retain_hashmap_100_000(b: &mut Bencher) {
+    let map = HMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 7 == 0);
+        map
+    });
+}
+
+#[bench]
+fn half_retain_indexmap_100_000(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 2 == 0);
+        map
+    });
+}
+
+#[bench]
+fn half_retain_hashmap_100_000(b: &mut Bencher) {
+    let map = HMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 2 == 0);
+        map
+    });
+}
+
+#[bench]
+fn many_retain_indexmap_100_000(b: &mut Bencher) {
+    let map = IMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 100 != 0);
+        map
+    });
+}
+
+#[bench]
+fn many_retain_hashmap_100_000(b: &mut Bencher) {
+    let map = HMAP_100K.clone();
+
+    b.iter(|| {
+        let mut map = map.clone();
+        map.retain(|k, _| *k % 100 != 0);
+        map
+    });
+}
+
+// simple sort impl for comparison
+pub fn simple_sort<K: Ord + Hash, V>(m: &mut IndexMap<K, V>) {
+    let mut ordered: Vec<_> = m.drain(..).collect();
+    ordered.sort_by(|left, right| left.0.cmp(&right.0));
+    m.extend(ordered);
+}
+
+#[bench]
+fn indexmap_sort_s(b: &mut Bencher) {
+    let map = IMAP_SORT_S.clone();
+
+    // there's a map clone there, but it's still useful to profile this
+    b.iter(|| {
+        let mut map = map.clone();
+        map.sort_keys();
+        map
+    });
+}
+
+#[bench]
+fn indexmap_simple_sort_s(b: &mut Bencher) {
+    let map = IMAP_SORT_S.clone();
+
+    // there's a map clone there, but it's still useful to profile this
+    b.iter(|| {
+        let mut map = map.clone();
+        simple_sort(&mut map);
+        map
+    });
+}
+
+#[bench]
+fn indexmap_sort_u32(b: &mut Bencher) {
+    let map = IMAP_SORT_U32.clone();
+
+    // there's a map clone there, but it's still useful to profile this
+    b.iter(|| {
+        let mut map = map.clone();
+        map.sort_keys();
+        map
+    });
+}
+
+#[bench]
+fn indexmap_simple_sort_u32(b: &mut Bencher) {
+    let map = IMAP_SORT_U32.clone();
+
+    // there's a map clone there, but it's still useful to profile this
+    b.iter(|| {
+        let mut map = map.clone();
+        simple_sort(&mut map);
+        map
+    });
+}
+
+// measure the fixed overhead of cloning in sort benchmarks
+#[bench]
+fn indexmap_clone_for_sort_s(b: &mut Bencher) {
+    let map = IMAP_SORT_S.clone();
+
+    b.iter(|| map.clone());
+}
+
+#[bench]
+fn indexmap_clone_for_sort_u32(b: &mut Bencher) {
+    let map = IMAP_SORT_U32.clone();
+
+    b.iter(|| map.clone());
+}
diff --git a/third_party/rust/indexmap/benches/faststring.rs b/third_party/rust/indexmap/benches/faststring.rs
new file mode 100644
index 0000000000..ecc28b408b
--- /dev/null
+++ b/third_party/rust/indexmap/benches/faststring.rs
@@ -0,0 +1,185 @@
+#![feature(test)]
+
+extern crate test;
+
+use test::Bencher;
+
+use indexmap::IndexMap;
+
+use std::collections::HashMap;
+
+use rand::rngs::SmallRng;
+use rand::seq::SliceRandom;
+use rand::SeedableRng;
+
+use std::hash::{Hash, Hasher};
+
+use std::borrow::Borrow;
+use std::ops::Deref;
+
+/// Use a consistently seeded Rng for benchmark stability
+fn small_rng() -> SmallRng {
+    let seed = u64::from_le_bytes(*b"indexmap");
+    SmallRng::seed_from_u64(seed)
+}
+
+#[derive(PartialEq, Eq, Copy, Clone)]
+#[repr(transparent)]
+pub struct OneShot<T: ?Sized>(pub T);
+
+impl Hash for OneShot<str> {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        h.write(self.0.as_bytes())
+    }
+}
+
+impl<'a, S> From<&'a S> for &'a OneShot<str>
+where
+    S: AsRef<str>,
+{
+    fn from(s: &'a S) -> Self {
+        let s: &str = s.as_ref();
+        unsafe { &*(s as *const str as *const OneShot<str>) }
+    }
+}
+
+impl Hash for OneShot<String> {
+    fn hash<H: Hasher>(&self, h: &mut H) {
+        h.write(self.0.as_bytes())
+    }
+}
+
+impl Borrow<OneShot<str>> for OneShot<String> {
+    fn borrow(&self) -> &OneShot<str> {
+        <&OneShot<str>>::from(&self.0)
+    }
+}
+
+impl<T> Deref for OneShot<T> {
+    type Target = T;
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+fn shuffled_keys<I>(iter: I) -> Vec<I::Item>
+where
+    I: IntoIterator,
+{
+    let mut v = Vec::from_iter(iter);
+    let mut rng = small_rng();
+    v.shuffle(&mut rng);
+    v
+}
+
+#[bench]
+fn insert_hashmap_string_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x.to_string(), ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_hashmap_string_oneshot_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = HashMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(OneShot(x.to_string()), ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn insert_indexmap_string_10_000(b: &mut Bencher) {
+    let c = 10_000;
+    b.iter(|| {
+        let mut map = IndexMap::with_capacity(c);
+        for x in 0..c {
+            map.insert(x.to_string(), ());
+        }
+        map
+    });
+}
+
+#[bench]
+fn lookup_hashmap_10_000_exist_string(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key.to_string(), 1);
+    }
+    let lookups = (5000..c).map(|x| x.to_string()).collect::<Vec<_>>();
+    b.iter(|| {
+        let mut found = 0;
+        for key in &lookups {
+            found += map.get(key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_hashmap_10_000_exist_string_oneshot(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = HashMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(OneShot(key.to_string()), 1);
+    }
+    let lookups = (5000..c)
+        .map(|x| OneShot(x.to_string()))
+        .collect::<Vec<_>>();
+    b.iter(|| {
+        let mut found = 0;
+        for key in &lookups {
+            found += map.get(key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_10_000_exist_string(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(key.to_string(), 1);
+    }
+    let lookups = (5000..c).map(|x| x.to_string()).collect::<Vec<_>>();
+    b.iter(|| {
+        let mut found = 0;
+        for key in &lookups {
+            found += map.get(key).is_some() as i32;
+        }
+        found
+    });
+}
+
+#[bench]
+fn lookup_indexmap_10_000_exist_string_oneshot(b: &mut Bencher) {
+    let c = 10_000;
+    let mut map = IndexMap::with_capacity(c);
+    let keys = shuffled_keys(0..c);
+    for &key in &keys {
+        map.insert(OneShot(key.to_string()), 1);
+    }
+    let lookups = (5000..c)
+        .map(|x| OneShot(x.to_string()))
+        .collect::<Vec<_>>();
+    b.iter(|| {
+        let mut found = 0;
+        for key in &lookups {
+            found += map.get(key).is_some() as i32;
+        }
+        found
+    });
+}