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Stable release v32.1bitcoin/bitcoin · f0de87f04062 ↗3,020 source files · 47.5 MB stored on the server440 file guides

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bitcoin / bitcoinstable

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bitcoin / src / bench / nanobench.h

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130,367 bytes · SHA-256 324a40ee27419492… · View upstream ↗

2501class LinuxPerformanceCounters {
2502public:
2503    struct Target {
2504        Target(uint64_t* targetValue_, bool correctMeasuringOverhead_, bool correctLoopOverhead_)
2505            : targetValue(targetValue_)
2506            , correctMeasuringOverhead(correctMeasuringOverhead_)
2507            , correctLoopOverhead(correctLoopOverhead_) {}
2508
2509        uint64_t* targetValue{};         // NOLINT(misc-non-private-member-variables-in-classes)
2510        bool correctMeasuringOverhead{}; // NOLINT(misc-non-private-member-variables-in-classes)
2511        bool correctLoopOverhead{};      // NOLINT(misc-non-private-member-variables-in-classes)
2512    };
2513
2514    LinuxPerformanceCounters() = default;
2515    LinuxPerformanceCounters(LinuxPerformanceCounters const&) = delete;
2516    LinuxPerformanceCounters(LinuxPerformanceCounters&&) = delete;
2517    LinuxPerformanceCounters& operator=(LinuxPerformanceCounters const&) = delete;
2518    LinuxPerformanceCounters& operator=(LinuxPerformanceCounters&&) = delete;
2519    ~LinuxPerformanceCounters();
2520
2521    // quick operation
2522    inline void start() {}
2523
2524    inline void stop() {}
2525
2526    bool monitor(perf_sw_ids swId, Target target);
2527    bool monitor(perf_hw_id hwId, Target target);
2528
2529    ANKERL_NANOBENCH(NODISCARD) bool hasError() const noexcept {
2530        return mHasError;
2531    }
2532
2533    // Just reading data is faster than enable & disabling.
2534    // we subtract data ourselves.
2535    inline void beginMeasure() {
2536        if (mHasError) {
2537            return;
2538        }
2539
2540        // NOLINTNEXTLINE(hicpp-signed-bitwise,cppcoreguidelines-pro-type-vararg)
2541        mHasError = -1 == ioctl(mFd, PERF_EVENT_IOC_RESET, PERF_IOC_FLAG_GROUP);
2542        if (mHasError) {
2543            return;
2544        }
2545
2546        // NOLINTNEXTLINE(hicpp-signed-bitwise,cppcoreguidelines-pro-type-vararg)
2547        mHasError = -1 == ioctl(mFd, PERF_EVENT_IOC_ENABLE, PERF_IOC_FLAG_GROUP);
2548    }
2549
2550    inline void endMeasure() {
2551        if (mHasError) {
2552            return;
2553        }
2554
2555        // NOLINTNEXTLINE(hicpp-signed-bitwise,cppcoreguidelines-pro-type-vararg)
2556        mHasError = (-1 == ioctl(mFd, PERF_EVENT_IOC_DISABLE, PERF_IOC_FLAG_GROUP));
2557        if (mHasError) {
2558            return;
2559        }
2560
2561        auto const numBytes = sizeof(uint64_t) * mCounters.size();
2562        auto ret = read(mFd, mCounters.data(), numBytes);
2563        mHasError = ret != static_cast<ssize_t>(numBytes);
2564    }
2565
2566    void updateResults(uint64_t numIters);
2567
2568    // rounded integer division
2569    template <typename T>
2570    static inline T divRounded(T a, T divisor) {
2571        return (a + divisor / 2) / divisor;
2572    }
2573
2574    ANKERL_NANOBENCH_NO_SANITIZE("integer", "undefined")
2575    static inline uint32_t mix(uint32_t x) noexcept {
2576        x ^= x << 13U;
2577        x ^= x >> 17U;
2578        x ^= x << 5U;
2579        return x;
2580    }
2581
2582    template <typename Op>
2583    ANKERL_NANOBENCH_NO_SANITIZE("integer", "undefined")
2584    void calibrate(Op&& op) {
2585        // clear current calibration data,
2586        for (auto& v : mCalibratedOverhead) {
2587            v = UINT64_C(0);
2588        }
2589
2590        // create new calibration data
2591        auto newCalibration = mCalibratedOverhead;
2592        for (auto& v : newCalibration) {
2593            v = (std::numeric_limits<uint64_t>::max)();
2594        }
2595        for (size_t iter = 0; iter < 100; ++iter) {
2596            beginMeasure();
2597            op();
2598            endMeasure();
2599            if (mHasError) {
2600                return;
2601            }
2602
2603            for (size_t i = 0; i < newCalibration.size(); ++i) {
2604                auto diff = mCounters[i];
2605                if (newCalibration[i] > diff) {
2606                    newCalibration[i] = diff;
2607                }
2608            }
2609        }
2610
2611        mCalibratedOverhead = std::move(newCalibration);
2612
2613        {
2614            // calibrate loop overhead. For branches & instructions this makes sense, not so much for everything else like cycles.
2615            // marsaglia's xorshift: mov, sal/shr, xor. Times 3.
2616            // This has the nice property that the compiler doesn't seem to be able to optimize multiple calls any further.
2617            // see https://godbolt.org/z/49RVQ5
2618            uint64_t const numIters = 100000U + (std::random_device{}() & 3U);
2619            uint64_t n = numIters;
2620            uint32_t x = 1234567;
2621
2622            beginMeasure();
2623            while (n-- > 0) {
2624                x = mix(x);
2625            }
2626            endMeasure();
2627            detail::doNotOptimizeAway(x);
2628            auto measure1 = mCounters;
2629
2630            n = numIters;
2631            beginMeasure();
2632            while (n-- > 0) {
2633                // we now run *twice* so we can easily calculate the overhead
2634                x = mix(x);
2635                x = mix(x);
2636            }
2637            endMeasure();
2638            detail::doNotOptimizeAway(x);
2639            auto measure2 = mCounters;
2640
2641            for (size_t i = 0; i < mCounters.size(); ++i) {
2642                // factor 2 because we have two instructions per loop
2643                auto m1 = measure1[i] > mCalibratedOverhead[i] ? measure1[i] - mCalibratedOverhead[i] : 0;
2644                auto m2 = measure2[i] > mCalibratedOverhead[i] ? measure2[i] - mCalibratedOverhead[i] : 0;
2645                auto overhead = m1 * 2 > m2 ? m1 * 2 - m2 : 0;
2646
2647                mLoopOverhead[i] = divRounded(overhead, numIters);
2648            }
2649        }
2650    }
2651
2652private:
2653    bool monitor(uint32_t type, uint64_t eventid, Target target);
2654
2655    std::map<uint64_t, Target> mIdToTarget{};
2656
2657    // start with minimum size of 3 for read_format
2658    std::vector<uint64_t> mCounters = std::vector<uint64_t>(3);
2659    std::vector<uint64_t> mCalibratedOverhead = std::vector<uint64_t>(3);
2660    std::vector<uint64_t> mLoopOverhead = std::vector<uint64_t>(3);
2661
2662    uint64_t mTimeEnabledNanos = 0;
2663    uint64_t mTimeRunningNanos = 0;
2664    int mFd = -1;
2665    bool mHasError = false;
2666};
2667ANKERL_NANOBENCH(IGNORE_PADDED_POP)
2668
2669LinuxPerformanceCounters::~LinuxPerformanceCounters() {
2670    if (-1 != mFd) {
2671        close(mFd);
2672    }
2673}
2674
2675bool LinuxPerformanceCounters::monitor(perf_sw_ids swId, LinuxPerformanceCounters::Target target) {
2676    return monitor(PERF_TYPE_SOFTWARE, swId, target);
2677}
2678
2679bool LinuxPerformanceCounters::monitor(perf_hw_id hwId, LinuxPerformanceCounters::Target target) {
2680    return monitor(PERF_TYPE_HARDWARE, hwId, target);
2681}
2682
2683// overflow is ok, it's checked
2684ANKERL_NANOBENCH_NO_SANITIZE("integer", "undefined")
2685void LinuxPerformanceCounters::updateResults(uint64_t numIters) {
2686    // clear old data
2687    for (auto& id_value : mIdToTarget) {
2688        *id_value.second.targetValue = UINT64_C(0);
2689    }
2690
2691    if (mHasError) {
2692        return;
2693    }
2694
2695    mTimeEnabledNanos = mCounters[1] - mCalibratedOverhead[1];
2696    mTimeRunningNanos = mCounters[2] - mCalibratedOverhead[2];
2697
2698    for (uint64_t i = 0; i < mCounters[0]; ++i) {
2699        auto idx = static_cast<size_t>(3 + i * 2 + 0);
2700        auto id = mCounters[idx + 1U];
2701
2702        auto it = mIdToTarget.find(id);
2703        if (it != mIdToTarget.end()) {
2704
2705            auto& tgt = it->second;
2706            *tgt.targetValue = mCounters[idx];
2707            if (tgt.correctMeasuringOverhead) {
2708                if (*tgt.targetValue >= mCalibratedOverhead[idx]) {
2709                    *tgt.targetValue -= mCalibratedOverhead[idx];
2710                } else {
2711                    *tgt.targetValue = 0U;
2712                }
2713            }
2714            if (tgt.correctLoopOverhead) {
2715                auto correctionVal = mLoopOverhead[idx] * numIters;
2716                if (*tgt.targetValue >= correctionVal) {
2717                    *tgt.targetValue -= correctionVal;
2718                } else {
2719                    *tgt.targetValue = 0U;
2720                }
2721            }
2722        }
2723    }
2724}
2725
2726bool LinuxPerformanceCounters::monitor(uint32_t type, uint64_t eventid, Target target) {
2727    *target.targetValue = (std::numeric_limits<uint64_t>::max)();
2728    if (mHasError) {
2729        return false;
2730    }
2731
2732    auto pea = perf_event_attr();
2733    std::memset(&pea, 0, sizeof(perf_event_attr));
2734    pea.type = type;
2735    pea.size = sizeof(perf_event_attr);
2736    pea.config = eventid;
2737    pea.disabled = 1; // start counter as disabled
2738    pea.exclude_kernel = 1;
2739    pea.exclude_hv = 1;
2740
2741    // NOLINTNEXTLINE(hicpp-signed-bitwise)
2742    pea.read_format = PERF_FORMAT_GROUP | PERF_FORMAT_ID | PERF_FORMAT_TOTAL_TIME_ENABLED | PERF_FORMAT_TOTAL_TIME_RUNNING;
2743
2744    const int pid = 0;                    // the current process
2745    const int cpu = -1;                   // all CPUs
2746#        if defined(PERF_FLAG_FD_CLOEXEC) // since Linux 3.14
2747    const unsigned long flags = PERF_FLAG_FD_CLOEXEC;
2748#        else
2749    const unsigned long flags = 0;
2750#        endif

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440 guided files · 2,580 pending. Guides cover key sections, not every line.

cmake/bitcoin-build-config.h.in src/consensus/amount.h src/consensus/consensus.h src/primitives/block.h src/primitives/transaction.h src/crypto/sha256.h src/util/moneystr.h src/clientversion.h src/uint256.h src/script/script.h src/policy/policy.h CMakeLists.txt README.md COPYING src/consensus/tx_check.cpp src/consensus/tx_verify.cpp src/consensus/merkle.cpp src/pow.cpp src/validation.cpp src/script/interpreter.cpp src/script/solver.cpp src/script/sign.cpp src/key_io.cpp src/net.cpp src/net_processing.cpp src/netaddress.cpp src/protocol.h src/wallet/wallet.cpp src/wallet/spend.cpp

← Previous 250 linesCode page 11Next 250 lines →

src/wallet/receive.cpp

src/wallet/coinselection.cpp

src/consensus/validation.h

src/primitives/transaction.cpp

src/script/descriptor.cpp

src/bitcoin-cli.cpp

src/rpc/blockchain.cpp

src/rpc/rawtransaction.cpp

src/init.cpp

src/crypto/sha256.cpp

src/consensus/merkle.h

src/consensus/tx_check.h

src/consensus/tx_verify.h

src/policy/feerate.h

src/policy/feerate.cpp

src/primitives/transaction_identifier.h

src/chainparamsbase.h

src/chainparamsbase.cpp

src/util/moneystr.cpp

src/crypto/ripemd160.h

src/crypto/sha1.h

src/crypto/sha512.h

src/crypto/hmac_sha256.h

src/crypto/hmac_sha512.h

src/crypto/hmac_sha256.cpp

src/crypto/hmac_sha512.cpp

src/crypto/hkdf_sha256_32.h

src/crypto/hkdf_sha256_32.cpp

src/support/cleanse.h

src/support/cleanse.cpp

src/crypto/siphash.cpp

src/crypto/muhash.h

src/crypto/chacha20.h

src/crypto/poly1305.h

src/crypto/chacha20poly1305.h

src/crypto/chacha20poly1305.cpp

src/util/chaintype.cpp

src/util/obfuscation.h

src/util/byte_units.h

src/util/overflow.h

src/blockencodings.cpp

src/net_permissions.cpp

src/policy/packages.cpp

src/policy/rbf.cpp

src/policy/truc_policy.cpp

src/policy/ephemeral_policy.cpp

src/policy/settings.cpp

src/policy/policy.cpp

src/node/transaction.cpp

src/node/coin.cpp

src/rpc/client.cpp

src/rpc/external_signer.cpp

src/rpc/request.cpp

src/rpc/server_util.cpp

src/rpc/fees.cpp

src/rpc/output_script.cpp

src/rpc/rawtransaction_util.cpp

src/rpc/rawtransaction_util.h

src/rpc/register.h

src/rpc/request.h

src/rpc/server_util.h

src/rpc/protocol.h

src/rpc/server.h

src/rpc/signmessage.cpp

src/rpc/txoutproof.cpp

src/rpc/util.cpp

src/rpc/util.h

src/wallet/rpc/addresses.cpp

src/wallet/rpc/backup.cpp

src/wallet/rpc/coins.cpp

src/wallet/rpc/encrypt.cpp

src/wallet/rpc/signmessage.cpp

src/wallet/rpc/util.cpp

src/wallet/rpc/util.h

src/wallet/coincontrol.cpp

src/wallet/coincontrol.h

src/wallet/context.cpp

src/wallet/context.h

src/wallet/crypter.cpp

src/wallet/crypter.h

src/wallet/db.cpp

src/wallet/export.cpp

src/wallet/external_signer_scriptpubkeyman.cpp

src/wallet/rpc/spend.cpp

src/wallet/rpc/transactions.cpp

src/wallet/rpc/wallet.cpp

src/wallet/feebumper.cpp

src/wallet/feebumper.h

src/index/base.h

src/index/base.cpp

src/index/txindex.h

src/index/txindex.cpp

src/index/txindex_key.h

src/index/txospenderindex.h

src/index/txospenderindex.cpp

src/index/blockfilterindex.h

src/index/blockfilterindex.cpp

src/index/coinstatsindex.h

src/index/coinstatsindex.cpp

src/index/db_key.h

src/index/disktxpos.h

src/kernel/chain.cpp

src/kernel/chain.h

src/kernel/checks.cpp

src/kernel/checks.h

src/kernel/context.cpp

src/kernel/context.h

src/kernel/cs_main.cpp

src/kernel/cs_main.h

src/kernel/disconnected_transactions.cpp

src/kernel/disconnected_transactions.h

src/kernel/mempool_removal_reason.cpp

src/kernel/mempool_removal_reason.h

src/kernel/coinstats.cpp

src/kernel/coinstats.h

src/kernel/chainparams.cpp

src/kernel/chainparams.h

src/wallet/sqlite.cpp

src/wallet/sqlite.h

src/wallet/transaction.cpp

src/wallet/transaction.h

src/wallet/dump.cpp

src/wallet/dump.h

src/wallet/init.cpp

src/wallet/walletutil.cpp

src/wallet/walletutil.h

src/wallet/wallettool.cpp

src/wallet/wallettool.h

src/wallet/export.h

src/wallet/migrate.cpp

src/wallet/migrate.h

src/wallet/db.h

src/wallet/walletdb.cpp

src/wallet/interfaces.cpp

src/wallet/scriptpubkeyman.cpp

src/wallet/scriptpubkeyman.h

src/kernel/bitcoinkernel.cpp

src/kernel/bitcoinkernel.h

src/kernel/bitcoinkernel_wrapper.h

src/node/chainstate.cpp

src/node/chainstate.h

src/node/blockstorage.cpp

src/node/blockstorage.h

src/node/mempool_persist.cpp

src/node/mempool_persist.h

src/node/utxo_snapshot.cpp

src/node/utxo_snapshot.h

src/node/kernel_notifications.cpp

src/node/kernel_notifications.h

src/node/blockmanager_args.cpp

src/kernel/blockmanager_opts.h

src/util/expected.cpp

src/policy/settings.h

src/util/types.h

src/kernel/messagestartchars.h

src/kernel/warning.h

src/util/exception.h

src/common/license_info.h

src/node/coins_view_args.h

src/node/database_args.h

src/util/batchpriority.h

src/util/ui_change_type.h

src/node/coins_view_args.cpp

src/node/peerman_args.h

src/util/serfloat.h

src/node/blockmanager_args.h

src/node/database_args.cpp

src/util/overloaded.h

src/interfaces/types.h

src/node/chainstatemanager_args.h

src/node/minisketchwrapper.h

src/util/macros.h

src/util/syserror.h

src/common/run_command.h

src/util/bytevectorhash.cpp

src/node/mempool_persist_args.cpp

src/util/exec.h

src/util/rbf.h

src/crypto/hex_base.h

src/node/mempool_persist_args.h

src/interfaces/echo.h

src/util/any.h

src/util/batchpriority.cpp

src/util/threadnames.h

src/node/coin.h

src/node/mempool_args.h

src/util/asmap.h

src/util/bytevectorhash.h

src/node/context.cpp

src/util/insert.h

src/util/readwritefile.h

src/node/peerman_args.cpp

src/node/interface_ui.cpp

src/interfaces/handler.h

src/node/mining_args.h

src/util/hasher.cpp

src/common/init.h

src/kernel/mempool_limits.h

src/common/system.h

src/crypto/sha3.h

src/util/threadinterrupt.cpp

src/node/protocol_version.h

src/util/exception.cpp

src/common/messages.h

src/node/connection_types.cpp

src/util/bip32.h

src/common/license_info.cpp

src/util/stdmutex.h

src/common/run_command.cpp

src/util/check.cpp

src/util/golombrice.h

src/node/types.h

src/node/timeoffsets.h

src/util/readwritefile.cpp

src/util/fastrange.h

src/util/signalinterrupt.h

src/util/task_runner.h

src/util/syserror.cpp

src/common/interfaces.cpp

src/common/types.h

src/util/threadinterrupt.h

src/kernel/chainstatemanager_opts.h

src/node/psbt.h

src/policy/ephemeral_policy.h

src/util/trace.h

src/common/url.cpp

src/kernel/mempool_options.h

src/util/serfloat.cpp

src/kernel/notifications_interface.h

src/node/timeoffsets.cpp

src/node/warnings.cpp

src/util/hash_type.h

src/crypto/hex_base.cpp

src/node/eviction.h

src/util/tokenbucket.h

src/crypto/aes.h

src/common/pcp.h

src/util/feefrac.cpp

src/node/transaction.h

src/util/threadnames.cpp

src/common/signmessage.h

src/util/exec.cpp

src/util/signalinterrupt.cpp

src/clientversion.cpp

src/common/signmessage.cpp

src/compat/assumptions.h

src/compat/byteswap.h

src/deploymentinfo.cpp

src/deploymentinfo.h

src/deploymentstatus.cpp

src/deploymentstatus.h

src/dummywallet.cpp

src/external_signer.h

src/init/bitcoin-gui.cpp

src/init/bitcoin-node.cpp

src/init/bitcoin-qt.cpp

src/init/bitcoin-wallet.cpp

src/init/bitcoind.cpp

src/init/common.h

src/interfaces/init.h

src/interfaces/ipc.h

src/key_io.h

src/logging/categories.h

src/logging/timer.h

src/mapport.h

src/musig.h

src/net_permissions.h

src/netgroup.h

src/netmessagemaker.h

src/node/chainstatemanager_args.cpp

src/node/connection_types.h

src/node/context.h

src/node/interface_ui.h

src/node/mempool_args.cpp

src/node/mining_args.cpp

src/node/minisketchwrapper.cpp

src/node/txreconciliation.h

src/policy/fees/estimator_args.cpp

src/policy/fees/estimator_args.h

src/policy/fees/estimator_man.cpp

src/policy/fees/estimator_man.h

src/policy/packages.h

src/policy/rbf.h

src/policy/truc_policy.h

src/pow.h

src/primitives/block.cpp

src/randomenv.h

src/rest.h

src/script/keyorigin.h

src/script/parsing.cpp

src/script/parsing.h

src/script/script_error.h

src/script/sigcache.cpp

src/script/sigcache.h

src/script/solver.h

src/script/verify_flags.h

src/semaphore_grant.h

src/signet.h

src/span.h

src/support/allocators/secure.h

src/support/allocators/zeroafterfree.h

src/util/tokenpipe.cpp

src/util/translation.h

src/util/vector.h

src/versionbits.h

src/versionbits_impl.h

src/wallet/external_signer_scriptpubkeyman.h

src/wallet/fees.h

src/wallet/load.h

src/wallet/receive.h

src/wallet/rpc/wallet.h

src/wallet/types.h

src/walletinitinterface.h

src/zmq/zmqabstractnotifier.cpp

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