feat(bb): op counting mode (AztecProtocol#4437)

- Introduces preset 'op-counting' that builds with support for operation
counts
- Introduces mechanism to connect this to google benchmark
- Support for ultra_honk_rounds_bench and goblin_bench right now

![image](https://github.com/AztecProtocol/aztec-packages/assets/163993/9785e99b-ef1f-4ea6-bfab-cd63d33499e1)

For best results run with e.g. `./bin/goblin_bench
--benchmark_min_time=0s --benchmark_counters_tabular=true`

other: - Make macros consistently have BB_, rename some BBERG_ macros

---------

Co-authored-by: ludamad <adam@aztecprotocol.com>

Author: ludamad

barretenberg/cpp/CMakePresets.json

@@ -166,6 +166,16 @@
         "LDFLAGS": "-fsanitize=memory"
       }
     },
+    {
+      "name": "op-counting",
+      "displayName": "Release build with operation counts for benchmarks",
+      "description": "Build with op counting",
+      "inherits": "clang16",
+      "binaryDir": "build-op-counting",
+      "environment": {
+        "CXXFLAGS": "-DBB_USE_OP_COUNT"
+      }
+    },
     {
       "name": "coverage",
       "displayName": "Build with coverage",
@@ -300,6 +310,11 @@
       "inherits": "default",
       "configurePreset": "clang16"
     },
+    {
+      "name": "op-counting",
+      "inherits": "default",
+      "configurePreset": "op-counting"
+    },
     {
       "name": "clang16-dbg",
       "inherits": "default",

barretenberg/cpp/src/barretenberg/benchmark/basics_bench/basics.bench.cpp

@@ -20,6 +20,7 @@
  *      sequential_copy:                        3.3
  *
  */
+#include "barretenberg/common/op_count.hpp"
 #include "barretenberg/common/thread.hpp"
 #include "barretenberg/ecc/curves/bn254/bn254.hpp"
 #include <benchmark/benchmark.h>

barretenberg/cpp/src/barretenberg/benchmark/goblin_bench/goblin.bench.cpp

@@ -2,6 +2,7 @@
 #include <benchmark/benchmark.h>
 
 #include "barretenberg/benchmark/ultra_bench/mock_proofs.hpp"
+#include "barretenberg/common/op_count_google_bench.hpp"
 #include "barretenberg/goblin/goblin.hpp"
 #include "barretenberg/goblin/mock_circuits.hpp"
 #include "barretenberg/proof_system/circuit_builder/ultra_circuit_builder.hpp"
@@ -67,6 +68,7 @@ BENCHMARK_DEFINE_F(GoblinBench, GoblinFull)(benchmark::State& state)
     GoblinMockCircuits::perform_op_queue_interactions_for_mock_first_circuit(goblin.op_queue);
 
     for (auto _ : state) {
+        BB_REPORT_OP_COUNT_IN_BENCH(state);
         // Perform a specified number of iterations of function/kernel accumulation
         perform_goblin_accumulation_rounds(state, goblin);
 

barretenberg/cpp/src/barretenberg/benchmark/ultra_bench/ultra_honk_rounds.bench.cpp

@@ -1,6 +1,7 @@
 #include <benchmark/benchmark.h>
 
 #include "barretenberg/benchmark/ultra_bench/mock_proofs.hpp"
+#include "barretenberg/common/op_count_google_bench.hpp"
 #include "barretenberg/proof_system/circuit_builder/ultra_circuit_builder.hpp"
 #include "barretenberg/ultra_honk/ultra_composer.hpp"
 #include "barretenberg/ultra_honk/ultra_prover.hpp"
@@ -27,15 +28,20 @@ enum {
  * @param prover - The ultrahonk prover.
  * @param index - The pass to measure.
  **/
-BBERG_PROFILE static void test_round_inner(State& state, UltraProver& prover, size_t index) noexcept
+BB_PROFILE static void test_round_inner(State& state, UltraProver& prover, size_t index) noexcept
 {
     auto time_if_index = [&](size_t target_index, auto&& func) -> void {
+        BB_REPORT_OP_COUNT_IN_BENCH(state);
         if (index == target_index) {
             state.ResumeTiming();
         }
+
         func();
         if (index == target_index) {
             state.PauseTiming();
+        } else {
+            // We don't actually want to write to user-defined counters
+            BB_REPORT_OP_COUNT_BENCH_CANCEL();
         }
     };
 
@@ -47,7 +53,7 @@ BBERG_PROFILE static void test_round_inner(State& state, UltraProver& prover, si
     time_if_index(RELATION_CHECK, [&] { prover.execute_relation_check_rounds(); });
     time_if_index(ZEROMORPH, [&] { prover.execute_zeromorph_rounds(); });
 }
-BBERG_PROFILE static void test_round(State& state, size_t index) noexcept
+BB_PROFILE static void test_round(State& state, size_t index) noexcept
 {
     bb::srs::init_crs_factory("../srs_db/ignition");
 

barretenberg/cpp/src/barretenberg/benchmark/ultra_bench/ultra_plonk_rounds.bench.cpp

@@ -17,7 +17,7 @@ enum {
     SIXTH_BATCH_OPEN
 };
 
-BBERG_PROFILE static void plonk_round(
+BB_PROFILE static void plonk_round(
     State& state, plonk::UltraProver& prover, size_t target_index, size_t index, auto&& func) noexcept
 {
     if (index == target_index) {
@@ -37,7 +37,7 @@ BBERG_PROFILE static void plonk_round(
  * @param prover - The ultraplonk prover.
  * @param index - The pass to measure.
  **/
-BBERG_PROFILE static void test_round_inner(State& state, plonk::UltraProver& prover, size_t index) noexcept
+BB_PROFILE static void test_round_inner(State& state, plonk::UltraProver& prover, size_t index) noexcept
 {
     plonk_round(state, prover, PREAMBLE, index, [&] { prover.execute_preamble_round(); });
     plonk_round(state, prover, FIRST_WIRE_COMMITMENTS, index, [&] { prover.execute_first_round(); });
@@ -47,7 +47,7 @@ BBERG_PROFILE static void test_round_inner(State& state, plonk::UltraProver& pro
     plonk_round(state, prover, FIFTH_COMPUTE_QUOTIENT_EVALUTION, index, [&] { prover.execute_fifth_round(); });
     plonk_round(state, prover, SIXTH_BATCH_OPEN, index, [&] { prover.execute_sixth_round(); });
 }
-BBERG_PROFILE static void test_round(State& state, size_t index) noexcept
+BB_PROFILE static void test_round(State& state, size_t index) noexcept
 {
     bb::srs::init_crs_factory("../srs_db/ignition");
     for (auto _ : state) {

barretenberg/cpp/src/barretenberg/common/compiler_hints.hpp

@@ -1,16 +1,26 @@
 #pragma once
 
 #ifdef _WIN32
-#define BBERG_INLINE __forceinline inline
+#define BB_INLINE __forceinline inline
 #else
-#define BBERG_INLINE __attribute__((always_inline)) inline
+#define BB_INLINE __attribute__((always_inline)) inline
 #endif
 
 // TODO(AD): Other instrumentation?
 #ifdef XRAY
-#define BBERG_PROFILE [[clang::xray_always_instrument]] [[clang::noinline]]
-#define BBERG_NO_PROFILE [[clang::xray_never_instrument]]
+#define BB_PROFILE [[clang::xray_always_instrument]] [[clang::noinline]]
+#define BB_NO_PROFILE [[clang::xray_never_instrument]]
 #else
-#define BBERG_PROFILE
-#define BBERG_NO_PROFILE
+#define BB_PROFILE
+#define BB_NO_PROFILE
+#endif
+
+// Optimization hints for clang - which outcome of an expression is expected for better
+// branch-prediction optimization
+#ifdef __clang__
+#define BB_LIKELY(x) __builtin_expect(!!(x), 1)
+#define BB_UNLIKELY(x) __builtin_expect(!!(x), 0)
+#else
+#define BB_LIKELY(x) x
+#define BB_UNLIKELY(x) x
 #endif

barretenberg/cpp/src/barretenberg/common/op_count.cpp

@@ -0,0 +1,51 @@
+
+#include <cstddef>
+#ifdef BB_USE_OP_COUNT
+#include "op_count.hpp"
+#include <iostream>
+#include <sstream>
+#include <thread>
+
+namespace bb::detail {
+void GlobalOpCountContainer::add_entry(const char* key, std::size_t* count)
+{
+    std::unique_lock<std::mutex> lock(mutex);
+    std::stringstream ss;
+    ss << std::this_thread::get_id();
+    counts.push_back({ key, ss.str(), count });
+}
+
+void GlobalOpCountContainer::print() const
+{
+    std::cout << "print_op_counts() START" << std::endl;
+    for (const Entry& entry : counts) {
+        if (*entry.count > 0) {
+            std::cout << entry.key << "\t" << *entry.count << "\t[thread=" << entry.thread_id << "]" << std::endl;
+        }
+    }
+    std::cout << "print_op_counts() END" << std::endl;
+}
+
+std::map<std::string, std::size_t> GlobalOpCountContainer::get_aggregate_counts() const
+{
+    std::map<std::string, std::size_t> aggregate_counts;
+    for (const Entry& entry : counts) {
+        if (*entry.count > 0) {
+            aggregate_counts[entry.key] += *entry.count;
+        }
+    }
+    return aggregate_counts;
+}
+
+void GlobalOpCountContainer::clear()
+{
+    std::unique_lock<std::mutex> lock(mutex);
+    for (Entry& entry : counts) {
+        *entry.count = 0;
+    }
+}
+
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+GlobalOpCountContainer GLOBAL_OP_COUNTS;
+} // namespace bb::detail
+#endif

barretenberg/cpp/src/barretenberg/common/op_count.hpp

@@ -0,0 +1,87 @@
+
+#pragma once
+
+#ifndef BB_USE_OP_COUNT
+// require a semicolon to appease formatters
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_OP_COUNT_TRACK() (void)0
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_OP_COUNT_TRACK_NAME(name) (void)0
+#else
+/**
+ * Provides an abstraction that counts operations based on function names.
+ * For efficiency, we spread out counts across threads.
+ */
+
+#include "barretenberg/common/compiler_hints.hpp"
+#include <algorithm>
+#include <atomic>
+#include <cstdlib>
+#include <map>
+#include <mutex>
+#include <string>
+#include <vector>
+namespace bb::detail {
+// Compile-time string
+// See e.g. https://www.reddit.com/r/cpp_questions/comments/pumi9r/does_c20_not_support_string_literals_as_template/
+template <std::size_t N> struct OperationLabel {
+    // NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays)
+    constexpr OperationLabel(const char (&str)[N])
+    {
+        for (std::size_t i = 0; i < N; ++i) {
+            value[i] = str[i];
+        }
+    }
+
+    // NOLINTNEXTLINE(cppcoreguidelines-avoid-c-arrays)
+    char value[N];
+};
+
+// Contains all statically known op counts
+struct GlobalOpCountContainer {
+  public:
+    struct Entry {
+        std::string key;
+        std::string thread_id;
+        std::size_t* count;
+    };
+    std::mutex mutex;
+    std::vector<Entry> counts;
+    void print() const;
+    // NOTE: Should be called when other threads aren't active
+    void clear();
+    void add_entry(const char* key, std::size_t* count);
+    std::map<std::string, std::size_t> get_aggregate_counts() const;
+};
+
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+extern GlobalOpCountContainer GLOBAL_OP_COUNTS;
+
+template <OperationLabel Op> struct GlobalOpCount {
+  public:
+    // NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+    static thread_local std::size_t* thread_local_count;
+
+    static constexpr void increment_op_count()
+    {
+        if (std::is_constant_evaluated()) {
+            // We do nothing if the compiler tries to run this
+            return;
+        }
+        if (BB_UNLIKELY(thread_local_count == nullptr)) {
+            thread_local_count = new std::size_t();
+            GLOBAL_OP_COUNTS.add_entry(Op.value, thread_local_count);
+        }
+        (*thread_local_count)++;
+    }
+};
+// NOLINTNEXTLINE(cppcoreguidelines-avoid-non-const-global-variables)
+template <OperationLabel Op> thread_local std::size_t* GlobalOpCount<Op>::thread_local_count;
+
+} // namespace bb::detail
+
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_OP_COUNT_TRACK() bb::detail::GlobalOpCount<__func__>::increment_op_count()
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_OP_COUNT_TRACK_NAME(name) bb::detail::GlobalOpCount<name>::increment_op_count()
+#endif

barretenberg/cpp/src/barretenberg/common/op_count_google_bench.hpp

@@ -0,0 +1,50 @@
+
+#pragma once
+#include <benchmark/benchmark.h>
+
+#ifndef BB_USE_OP_COUNT
+namespace bb {
+struct GoogleBenchOpCountReporter {
+    GoogleBenchOpCountReporter(::benchmark::State& state)
+    {
+        // unused, we don't have op counts on
+        (void)state;
+    }
+};
+}; // namespace bb
+// require a semicolon to appease formatters
+#define BB_REPORT_OP_COUNT_IN_BENCH(state) (void)0
+#define BB_REPORT_OP_COUNT_BENCH_CANCEL() (void)0
+#else
+#include "op_count.hpp"
+namespace bb {
+// NOLINTNEXTLINE(cppcoreguidelines-special-member-functions)
+struct GoogleBenchOpCountReporter {
+    // We allow having a ref member as this only lives inside a function frame
+    ::benchmark::State& state;
+    bool cancelled = false;
+    GoogleBenchOpCountReporter(::benchmark::State& state)
+        : state(state)
+    {
+        // Intent: Clear when we enter the state loop
+        bb::detail::GLOBAL_OP_COUNTS.clear();
+    }
+    ~GoogleBenchOpCountReporter()
+    {
+        // Allow for conditional reporting
+        if (cancelled) {
+            return;
+        }
+        // Intent: Collect results when we exit the state loop
+        for (auto& entry : bb::detail::GLOBAL_OP_COUNTS.get_aggregate_counts()) {
+            state.counters[entry.first] = static_cast<double>(entry.second);
+        }
+    }
+};
+// Allow for integration with google benchmark user-defined counters
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_REPORT_OP_COUNT_IN_BENCH(state) GoogleBenchOpCountReporter __bb_report_op_count_in_bench{ state };
+// NOLINTNEXTLINE(cppcoreguidelines-macro-usage)
+#define BB_REPORT_OP_COUNT_BENCH_CANCEL() __bb_report_op_count_in_bench.cancelled = true;
+}; // namespace bb
+#endif

barretenberg/cpp/src/barretenberg/common/parallel_for_mutex_pool.cpp

@@ -52,7 +52,7 @@ class ThreadPool {
     std::condition_variable complete_condition_;
     bool stop = false;
 
-    BBERG_NO_PROFILE void worker_loop(size_t thread_index);
+    BB_NO_PROFILE void worker_loop(size_t thread_index);
 
     void do_iterations()
     {