Skip sorting if already sorted for skip list

CMakeLists.txt

@@ -380,11 +380,13 @@ if(CMAKE_SOURCE_DIR STREQUAL CMAKE_CURRENT_SOURCE_DIR AND BUILD_TESTING)
         ${symbol_imports})
   endif()
 
-  find_program(HARDENING_CHECK hardening-check)
-  if(HARDENING_CHECK)
-    add_test(NAME hardening_check
-             COMMAND ${HARDENING_CHECK} $<TARGET_FILE:${PROJECT_NAME}>
-                     --nofortify --nostackprotector)
+  if(NOT CMAKE_CROSSCOMPILING)
+    find_program(HARDENING_CHECK hardening-check)
+    if(HARDENING_CHECK)
+      add_test(NAME hardening_check
+               COMMAND ${HARDENING_CHECK} $<TARGET_FILE:${PROJECT_NAME}>
+                       --nofortify --nostackprotector)
+    endif()
   endif()
 
   # bench

ConflictSet.cpp

@@ -3183,6 +3183,12 @@ Node *firstGeqPhysical(Node *n, const TrivialSpan key) {
 #define PRESERVE_NONE
 #endif
 
+#if __has_attribute(musttail) && __has_attribute(preserve_none)
+constexpr bool kEnableInterleaved = true;
+#else
+constexpr bool kEnableInterleaved = false;
+#endif
+
 namespace check {
 
 typedef PRESERVE_NONE void (*Continuation)(struct Job *, struct Context *);
@@ -4969,51 +4975,50 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     check::Context context;
     context.readContext.impl = this;
 
-#if __has_attribute(musttail)
-    if (count == 1) {
-      useSequential(reads, result, count, context);
-    } else {
-      constexpr int kConcurrent = 16;
-      check::Job inProgress[kConcurrent];
-      context.count = count;
-      context.oldestVersionFullPrecision = oldestVersionFullPrecision;
-      context.root = root;
-      context.queries = reads;
-      context.results = result;
-      int64_t started = std::min(kConcurrent, count);
-      context.started = started;
-      for (int i = 0; i < started; i++) {
-        inProgress[i].init(reads + i, result + i, root,
-                           oldestVersionFullPrecision);
-      }
-      for (int i = 0; i < started - 1; i++) {
-        inProgress[i].next = inProgress + i + 1;
-      }
-      for (int i = 1; i < started; i++) {
-        inProgress[i].prev = inProgress + i - 1;
-      }
-      inProgress[0].prev = inProgress + started - 1;
-      inProgress[started - 1].next = inProgress;
+    if constexpr (kEnableInterleaved) {
+      if (count == 1) {
+        useSequential(reads, result, count, context);
+      } else {
+        constexpr int kConcurrent = 16;
+        check::Job inProgress[kConcurrent];
+        context.count = count;
+        context.oldestVersionFullPrecision = oldestVersionFullPrecision;
+        context.root = root;
+        context.queries = reads;
+        context.results = result;
+        int64_t started = std::min(kConcurrent, count);
+        context.started = started;
+        for (int i = 0; i < started; i++) {
+          inProgress[i].init(reads + i, result + i, root,
+                             oldestVersionFullPrecision);
+        }
+        for (int i = 0; i < started - 1; i++) {
+          inProgress[i].next = inProgress + i + 1;
+        }
+        for (int i = 1; i < started; i++) {
+          inProgress[i].prev = inProgress + i - 1;
+        }
+        inProgress[0].prev = inProgress + started - 1;
+        inProgress[started - 1].next = inProgress;
 
-      // Kick off the sequence of tail calls that finally returns once all jobs
-      // are done
-      inProgress->continuation(inProgress, &context);
+        // Kick off the sequence of tail calls that finally returns once all
+        // jobs are done
+        inProgress->continuation(inProgress, &context);
 
 #ifndef NDEBUG
-      Arena arena;
-      auto *results2 = new (arena) Result[count];
-      check::Context context2;
-      context2.readContext.impl = this;
-      useSequential(reads, results2, count, context2);
-      assert(memcmp(result, results2, count) == 0);
-      assert(context.readContext == context2.readContext);
+        Arena arena;
+        auto *results2 = new (arena) Result[count];
+        check::Context context2;
+        context2.readContext.impl = this;
+        useSequential(reads, results2, count, context2);
+        assert(memcmp(result, results2, count) == 0);
+        assert(context.readContext == context2.readContext);
 #endif
+      }
+    } else {
+      useSequential(reads, result, count, context);
     }
 
-#else
-    useSequential(reads, result, count, context);
-#endif
-
     for (int i = 0; i < count; ++i) {
       assert(reads[i].readVersion >= 0);
       assert(reads[i].readVersion <= newestVersionFullPrecision);
@@ -5186,11 +5191,6 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
     assert(allPointWrites || sorted);
 #endif
 
-#if __has_attribute(musttail)
-    constexpr bool kEnableInterleaved = true;
-#else
-    constexpr bool kEnableInterleaved = false;
-#endif
     if (kEnableInterleaved && count > 1) {
       interleavedWrites(writes, count, InternalVersionT(writeVersion));
     } else {

ServerBench.cpp

@@ -64,31 +64,47 @@ template <class... Ts> std::string tupleKey(const Ts &...ts) {
   return result;
 }
 
-constexpr int kWindowSize = 300000;
+constexpr int kTotalKeyRange = 1'000'000'000;
+constexpr int kWindowSize = 1'000'000;
+constexpr int kNumKeys = 10;
 
 void workload(weaselab::ConflictSet *cs) {
   int64_t version = kWindowSize;
-  constexpr int kNumWrites = 16;
   for (;; transactions.fetch_add(1, std::memory_order_relaxed)) {
     std::vector<int64_t> keyIndices;
-    for (int i = 0; i < kNumWrites; ++i) {
-      keyIndices.push_back(rand() % 100'000'000);
+    for (int i = 0; i < kNumKeys; ++i) {
+      keyIndices.push_back(rand() % kTotalKeyRange);
     }
     std::sort(keyIndices.begin(), keyIndices.end());
     std::vector<std::string> keys;
-    std::vector<weaselab::ConflictSet::WriteRange> writes;
-    constexpr std::string_view suffix = "this is a suffix";
-    for (int i = 0; i < kNumWrites; ++i) {
-      keys.push_back(tupleKey(0x100, i, keyIndices[i],
-                              suffix.substr(0, rand() % suffix.size()),
-                              rand()));
+    constexpr std::string_view fullString =
+        "this is a string, where a prefix of it is used as an element of the "
+        "tuple forming the key";
+    for (int i = 0; i < kNumKeys; ++i) {
+      keys.push_back(
+          tupleKey(0x100, keyIndices[i] / fullString.size(),
+                   fullString.substr(0, keyIndices[i] % fullString.size())));
       // printf("%s\n", printable(keys.back()).c_str());
     }
-    for (int i = 0; i < kNumWrites; ++i) {
+
+    std::vector<weaselab::ConflictSet::ReadRange> reads;
+    std::vector<weaselab::ConflictSet::WriteRange> writes;
+    std::vector<weaselab::ConflictSet::Result> results;
+    for (int i = 0; i < kNumKeys; ++i) {
       writes.push_back({{(const uint8_t *)keys[i].data(), int(keys[i].size())},
                         {nullptr, 0}});
+      reads.push_back({{(const uint8_t *)keys[i].data(), int(keys[i].size())},
+                       {nullptr, 0},
+                       version - kWindowSize});
     }
-    cs->addWrites(writes.data(), writes.size(), version);
+    results.resize(reads.size());
+
+    cs->check(reads.data(), results.data(), reads.size());
+    bool ok = true;
+    for (auto result : results) {
+      ok &= result == weaselab::ConflictSet::Commit;
+    }
+    cs->addWrites(writes.data(), ok ? writes.size() : 0, version);
     cs->setOldestVersion(version - kWindowSize);
     ++version;
   }

SkipList.cpp

@@ -767,7 +767,9 @@ struct __attribute__((visibility("hidden"))) ConflictSet::Impl {
           false, true);
     }
 
-    sortPoints(points);
+    if (!std::is_sorted(points.begin(), points.end())) {
+      sortPoints(points);
+    }
 
     int activeWriteCount = 0;
     std::vector<std::pair<StringRef, StringRef>> combinedWriteConflictRanges;