Shard AllocMap Lock

This improves performance on many-seed parallel (-Zthreads=32) miri
executions from managing to use ~8 cores to using 27-28 cores. That's
pretty reasonable scaling for the simplicity of this solution.

Author: Mark-Simulacrum

compiler/rustc_middle/src/mir/interpret/mod.rs

@@ -10,11 +10,13 @@ mod value;
 
 use std::io::{Read, Write};
 use std::num::NonZero;
+use std::sync::atomic::AtomicU64;
 use std::{fmt, io};
 
 use rustc_abi::{AddressSpace, Align, Endian, HasDataLayout, Size};
 use rustc_ast::{LitKind, Mutability};
 use rustc_data_structures::fx::FxHashMap;
+use rustc_data_structures::sharded::ShardedHashMap;
 use rustc_data_structures::sync::Lock;
 use rustc_hir::def::DefKind;
 use rustc_hir::def_id::{DefId, LocalDefId};
@@ -389,35 +391,37 @@ pub const CTFE_ALLOC_SALT: usize = 0;
 
 pub(crate) struct AllocMap<'tcx> {
     /// Maps `AllocId`s to their corresponding allocations.
-    alloc_map: FxHashMap<AllocId, GlobalAlloc<'tcx>>,
+    // Note that this map on rustc workloads seems to be rather dense. In #136105 we considered
+    // replacing it with a (dense) Vec-based map, but since there are workloads where it can be
+    // sparse we decided to go with sharding for now. At least up to 32 cores there doesn't seem to
+    // be much difference in performance on the one parallel workload we tested.
+    to_alloc: ShardedHashMap<AllocId, GlobalAlloc<'tcx>>,
 
     /// Used to deduplicate global allocations: functions, vtables, string literals, ...
     ///
     /// The `usize` is a "salt" used by Miri to make deduplication imperfect, thus better emulating
     /// the actual guarantees.
-    dedup: FxHashMap<(GlobalAlloc<'tcx>, usize), AllocId>,
+    dedup: Lock<FxHashMap<(GlobalAlloc<'tcx>, usize), AllocId>>,
 
     /// The `AllocId` to assign to the next requested ID.
     /// Always incremented; never gets smaller.
-    next_id: AllocId,
+    next_id: AtomicU64,
 }
 
 impl<'tcx> AllocMap<'tcx> {
     pub(crate) fn new() -> Self {
         AllocMap {
-            alloc_map: Default::default(),
+            to_alloc: Default::default(),
             dedup: Default::default(),
-            next_id: AllocId(NonZero::new(1).unwrap()),
+            next_id: AtomicU64::new(1),
         }
     }
-    fn reserve(&mut self) -> AllocId {
-        let next = self.next_id;
-        self.next_id.0 = self.next_id.0.checked_add(1).expect(
-            "You overflowed a u64 by incrementing by 1... \
-             You've just earned yourself a free drink if we ever meet. \
-             Seriously, how did you do that?!",
-        );
-        next
+    fn reserve(&self) -> AllocId {
+        // Technically there is a window here where we overflow and then another thread
+        // increments `next_id` *again* and uses it before we panic and tear down the entire session.
+        // We consider this fine since such overflows cannot realistically occur.
+        let next_id = self.next_id.fetch_add(1, std::sync::atomic::Ordering::Relaxed);
+        AllocId(NonZero::new(next_id).unwrap())
     }
 }
 
@@ -428,26 +432,33 @@ impl<'tcx> TyCtxt<'tcx> {
     /// Make sure to call `set_alloc_id_memory` or `set_alloc_id_same_memory` before returning such
     /// an `AllocId` from a query.
     pub fn reserve_alloc_id(self) -> AllocId {
-        self.alloc_map.lock().reserve()
+        self.alloc_map.reserve()
     }
 
     /// Reserves a new ID *if* this allocation has not been dedup-reserved before.
     /// Should not be used for mutable memory.
     fn reserve_and_set_dedup(self, alloc: GlobalAlloc<'tcx>, salt: usize) -> AllocId {
-        let mut alloc_map = self.alloc_map.lock();
         if let GlobalAlloc::Memory(mem) = alloc {
             if mem.inner().mutability.is_mut() {
                 bug!("trying to dedup-reserve mutable memory");
             }
         }
         let alloc_salt = (alloc, salt);
-        if let Some(&alloc_id) = alloc_map.dedup.get(&alloc_salt) {
+        let mut dedup = self.alloc_map.dedup.lock();
+        if let Some(&alloc_id) = dedup.get(&alloc_salt) {
             return alloc_id;
         }
-        let id = alloc_map.reserve();
+        let id = self.alloc_map.reserve();
         debug!("creating alloc {:?} with id {id:?}", alloc_salt.0);
-        alloc_map.alloc_map.insert(id, alloc_salt.0.clone());
-        alloc_map.dedup.insert(alloc_salt, id);
+        // We just reserved, so should always be unique.
+        assert!(
+            self.alloc_map
+                .to_alloc
+                .lock_shard_by_value(&id)
+                .insert(id, alloc_salt.0.clone())
+                .is_none()
+        );
+        dedup.insert(alloc_salt, id);
         id
     }
 
@@ -497,7 +508,7 @@ impl<'tcx> TyCtxt<'tcx> {
     /// local dangling pointers and allocations in constants/statics.
     #[inline]
     pub fn try_get_global_alloc(self, id: AllocId) -> Option<GlobalAlloc<'tcx>> {
-        self.alloc_map.lock().alloc_map.get(&id).cloned()
+        self.alloc_map.to_alloc.lock_shard_by_value(&id).get(&id).cloned()
     }
 
     #[inline]
@@ -516,16 +527,21 @@ impl<'tcx> TyCtxt<'tcx> {
     /// Freezes an `AllocId` created with `reserve` by pointing it at an `Allocation`. Trying to
     /// call this function twice, even with the same `Allocation` will ICE the compiler.
     pub fn set_alloc_id_memory(self, id: AllocId, mem: ConstAllocation<'tcx>) {
-        if let Some(old) = self.alloc_map.lock().alloc_map.insert(id, GlobalAlloc::Memory(mem)) {
+        if let Some(old) =
+            self.alloc_map.to_alloc.lock_shard_by_value(&id).insert(id, GlobalAlloc::Memory(mem))
+        {
             bug!("tried to set allocation ID {id:?}, but it was already existing as {old:#?}");
         }
     }
 
     /// Freezes an `AllocId` created with `reserve` by pointing it at a static item. Trying to
     /// call this function twice, even with the same `DefId` will ICE the compiler.
     pub fn set_nested_alloc_id_static(self, id: AllocId, def_id: LocalDefId) {
-        if let Some(old) =
-            self.alloc_map.lock().alloc_map.insert(id, GlobalAlloc::Static(def_id.to_def_id()))
+        if let Some(old) = self
+            .alloc_map
+            .to_alloc
+            .lock_shard_by_value(&id)
+            .insert(id, GlobalAlloc::Static(def_id.to_def_id()))
         {
             bug!("tried to set allocation ID {id:?}, but it was already existing as {old:#?}");
         }

compiler/rustc_middle/src/ty/context.rs

@@ -1348,7 +1348,7 @@ pub struct GlobalCtxt<'tcx> {
     pub data_layout: TargetDataLayout,
 
     /// Stores memory for globals (statics/consts).
-    pub(crate) alloc_map: Lock<interpret::AllocMap<'tcx>>,
+    pub(crate) alloc_map: interpret::AllocMap<'tcx>,
 }
 
 /// This is used to get a reference to a `GlobalCtxt` if one is available.
@@ -1538,7 +1538,7 @@ impl<'tcx> TyCtxt<'tcx> {
             new_solver_evaluation_cache: Default::default(),
             canonical_param_env_cache: Default::default(),
             data_layout,
-            alloc_map: Lock::new(interpret::AllocMap::new()),
+            alloc_map: interpret::AllocMap::new(),
         });
 
         let icx = tls::ImplicitCtxt::new(&gcx);