Add Basic CheckQueue Benchmark

Author: JeremyRubin

src/Makefile.bench.include

@@ -15,6 +15,7 @@ bench_bench_bitcoin_SOURCES = \
   bench/bench.cpp \
   bench/bench.h \
   bench/checkblock.cpp \
+  bench/checkqueue.cpp \
   bench/Examples.cpp \
   bench/rollingbloom.cpp \
   bench/crypto_hash.cpp \

src/bench/checkqueue.cpp

@@ -0,0 +1,94 @@
+// Copyright (c) 2015 The Bitcoin Core developers
+// Distributed under the MIT software license, see the accompanying
+// file COPYING or http://www.opensource.org/licenses/mit-license.php.
+
+#include "bench.h"
+#include "util.h"
+#include "validation.h"
+#include "checkqueue.h"
+#include "prevector.h"
+#include <vector>
+#include <boost/thread/thread.hpp>
+#include "random.h"
+
+
+// This Benchmark tests the CheckQueue with the lightest
+// weight Checks, so it should make any lock contention
+// particularly visible
+static void CCheckQueueSpeed(benchmark::State& state)
+{
+    struct FakeJobNoWork {
+        bool operator()()
+        {
+            return true;
+        }
+        void swap(FakeJobNoWork& x){};
+    };
+    CCheckQueue<FakeJobNoWork> queue {128};
+    boost::thread_group tg;
+    for (auto x = 0; x < std::max(2, GetNumCores()); ++x) {
+       tg.create_thread([&]{queue.Thread();});
+    }
+    while (state.KeepRunning()) {
+        CCheckQueueControl<FakeJobNoWork> control(&queue);
+        // We can make vChecks out of the loop because calling Add doesn't
+        // change the size of the vector.
+        std::vector<FakeJobNoWork> vChecks;
+        vChecks.resize(30);
+
+        // We call Add a number of times to simulate the behavior of adding
+        // a block of transactions at once.
+        for (size_t j = 0; j < 101; ++j) {
+            control.Add(vChecks);
+        }
+        // control waits for completion by RAII, but
+        // it is done explicitly here for clarity
+        control.Wait();
+    }
+    tg.interrupt_all();
+    tg.join_all();
+}
+
+// This Benchmark tests the CheckQueue with a slightly realistic workload,
+// where checks all contain a prevector that is indirect 50% of the time
+// and there is a little bit of work done between calls to Add.
+static void CCheckQueueSpeedPrevectorJob(benchmark::State& state)
+{
+    struct PrevectorJob {
+        prevector<28, uint8_t> p;
+        PrevectorJob(){
+        }
+        PrevectorJob(FastRandomContext& insecure_rand){
+            p.resize(insecure_rand.rand32() % 56);
+        }
+        bool operator()()
+        {
+            return true;
+        }
+        void swap(PrevectorJob& x){p.swap(x.p);};
+    };
+    CCheckQueue<PrevectorJob> queue {128};
+    boost::thread_group tg;
+    for (auto x = 0; x < std::max(2, GetNumCores()); ++x) {
+       tg.create_thread([&]{queue.Thread();});
+    }
+    while (state.KeepRunning()) {
+        // Make insecure_rand here so that each iteration is identical.
+        FastRandomContext insecure_rand(true);
+        CCheckQueueControl<PrevectorJob> control(&queue);
+        for (size_t j = 0; j < 101; ++j) {
+            std::vector<PrevectorJob> vChecks;
+            vChecks.reserve(30);
+            for (auto x = 0; x < 30; ++x)
+                vChecks.emplace_back(insecure_rand);
+            control.Add(vChecks);
+        }
+        // control waits for completion by RAII, but
+        // it is done explicitly here for clarity
+        control.Wait();
+    }
+    tg.interrupt_all();
+    tg.join_all();
+}
+BENCHMARK(CCheckQueueSpeed);
+BENCHMARK(CCheckQueueSpeedPrevectorJob);