src/bench/lockedpool.cpp


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// Copyright (c) 2016-2020 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 MSIZE 2048

static void BenchLockedPool(benchmark::Bench& bench)
{
    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;
    bench.run([&] {
        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);