lockedpool.cpp

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// Copyright (c) 2016 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/bench.h>

#include <support/lockedpool.h>

#include <vector>

#define ASIZE 2048
#define BITER 5000
#define MSIZE 2048

static void BenchLockedPool(benchmark::State &state) {
    void *synth_base = reinterpret_cast<void *>(0x08000000);
    const size_t synth_size = 1024 * 1024;
    Arena b(synth_base, synth_size, 16);

    std::vector<void *> addr;
    for (int x = 0; x < ASIZE; ++x) {
        addr.push_back(nullptr);
    }
    uint32_t s = 0x12345678;
    while (state.KeepRunning()) {
        for (int x = 0; x < BITER; ++x) {
            int idx = s & (addr.size() - 1);
            if (s & 0x80000000) {
                b.free(addr[idx]);
                addr[idx] = nullptr;
            } else if (!addr[idx]) {
                addr[idx] = b.alloc((s >> 16) & (MSIZE - 1));
            }
            bool lsb = s & 1;
            s >>= 1;
            if (lsb) {
                s ^= 0xf00f00f0; // LFSR period 0xf7ffffe0
            }
        }
    }
    for (void *ptr : addr) {
        b.free(ptr);
    }
    addr.clear();
}

BENCHMARK(BenchLockedPool, 1300);