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// Copyright (c) 2021 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 <node/minisketchwrapper.h>
#include <logging.h>
#include <util/time.h>
#include <minisketch.h>
#include <algorithm>
#include <cstddef>
#include <cstdint>
#include <optional>
#include <utility>
#include <vector>
namespace {
static constexpr uint32_t BITS = 32;
uint32_t FindBestImplementation()
{
std::optional<std::pair<int64_t, uint32_t>> best;
uint32_t max_impl = Minisketch::MaxImplementation();
for (uint32_t impl = 0; impl <= max_impl; ++impl) {
std::vector<int64_t> benches;
uint64_t offset = 0;
/* Run a little benchmark with capacity 32, adding 184 entries, and decoding 11 of them once. */
for (int b = 0; b < 11; ++b) {
if (!Minisketch::ImplementationSupported(BITS, impl)) break;
Minisketch sketch(BITS, impl, 32);
auto start = GetTimeMicros();
for (uint64_t e = 0; e < 100; ++e) {
sketch.Add(e*1337 + b*13337 + offset);
}
for (uint64_t e = 0; e < 84; ++e) {
sketch.Add(e*1337 + b*13337 + offset);
}
offset += (*sketch.Decode(32))[0];
auto stop = GetTimeMicros();
benches.push_back(stop - start);
}
/* Remember which implementation has the best median benchmark time. */
if (!benches.empty()) {
std::sort(benches.begin(), benches.end());
if (!best || best->first > benches[5]) {
best = std::make_pair(benches[5], impl);
}
}
}
assert(best.has_value());
LogPrintf("Using Minisketch implementation number %i\n", best->second);
return best->second;
}
uint32_t Minisketch32Implementation()
{
// Fast compute-once idiom.
static uint32_t best = FindBestImplementation();
return best;
}
} // namespace
Minisketch MakeMinisketch32(size_t capacity)
{
return Minisketch(BITS, Minisketch32Implementation(), capacity);
}
Minisketch MakeMinisketch32FP(size_t max_elements, uint32_t fpbits)
{
return Minisketch::CreateFP(BITS, Minisketch32Implementation(), max_elements, fpbits);
}
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