mirror of
https://github.com/monero-project/monero.git
synced 2025-08-06 17:04:19 -04:00
blockchain: keep a rolling long term block weight median
This commit is contained in:
parent
581994b61c
commit
a4c4a2d8aa
6 changed files with 476 additions and 34 deletions
202
tests/unit_tests/rolling_median.cpp
Normal file
202
tests/unit_tests/rolling_median.cpp
Normal file
|
@ -0,0 +1,202 @@
|
|||
// Copyright (c) 2019, The Monero Project
|
||||
//
|
||||
// All rights reserved.
|
||||
//
|
||||
// Redistribution and use in source and binary forms, with or without modification, are
|
||||
// permitted provided that the following conditions are met:
|
||||
//
|
||||
// 1. Redistributions of source code must retain the above copyright notice, this list of
|
||||
// conditions and the following disclaimer.
|
||||
//
|
||||
// 2. Redistributions in binary form must reproduce the above copyright notice, this list
|
||||
// of conditions and the following disclaimer in the documentation and/or other
|
||||
// materials provided with the distribution.
|
||||
//
|
||||
// 3. Neither the name of the copyright holder nor the names of its contributors may be
|
||||
// used to endorse or promote products derived from this software without specific
|
||||
// prior written permission.
|
||||
//
|
||||
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
|
||||
// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
||||
// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
|
||||
// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
||||
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
|
||||
// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
|
||||
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
|
||||
// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
|
||||
// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
||||
|
||||
#include <random>
|
||||
#include "gtest/gtest.h"
|
||||
#include "misc_language.h"
|
||||
#include "rolling_median.h"
|
||||
#include "crypto/crypto.h"
|
||||
|
||||
TEST(rolling_median, one)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(1);
|
||||
m.insert(42);
|
||||
ASSERT_EQ(m.median(), 42);
|
||||
m.insert(18);
|
||||
ASSERT_EQ(m.median(), 18);
|
||||
m.insert(7483);
|
||||
ASSERT_EQ(m.median(), 7483);
|
||||
}
|
||||
|
||||
TEST(rolling_median, two)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(2);
|
||||
m.insert(42);
|
||||
ASSERT_EQ(m.median(), 42);
|
||||
m.insert(45);
|
||||
ASSERT_EQ(m.median(), 43);
|
||||
m.insert(49);
|
||||
ASSERT_EQ(m.median(), 47);
|
||||
m.insert(41);
|
||||
ASSERT_EQ(m.median(), 45);
|
||||
m.insert(43);
|
||||
ASSERT_EQ(m.median(), 42);
|
||||
m.insert(40);
|
||||
ASSERT_EQ(m.median(), 41);
|
||||
m.insert(41);
|
||||
ASSERT_EQ(m.median(), 40);
|
||||
}
|
||||
|
||||
TEST(rolling_median, series)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(100);
|
||||
std::vector<uint64_t> v;
|
||||
v.reserve(100);
|
||||
for (int i = 0; i < 10000; ++i)
|
||||
{
|
||||
uint64_t r = rand();
|
||||
v.push_back(r);
|
||||
if (v.size() > 100)
|
||||
v.erase(v.begin());
|
||||
m.insert(r);
|
||||
std::vector<uint64_t> vcopy = v;
|
||||
ASSERT_EQ(m.median(), epee::misc_utils::median(vcopy));
|
||||
}
|
||||
}
|
||||
|
||||
TEST(rolling_median, clear_whole)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(100);
|
||||
std::vector<uint64_t> random, median;
|
||||
random.reserve(10000);
|
||||
median.reserve(10000);
|
||||
for (int i = 0; i < 10000; ++i)
|
||||
{
|
||||
random.push_back(rand());
|
||||
m.insert(random.back());
|
||||
median.push_back(m.median());
|
||||
}
|
||||
m.clear();
|
||||
for (int i = 0; i < 10000; ++i)
|
||||
{
|
||||
m.insert(random[i]);
|
||||
ASSERT_EQ(median[i], m.median());
|
||||
}
|
||||
}
|
||||
|
||||
TEST(rolling_median, clear_partway)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(100);
|
||||
std::vector<uint64_t> random, median;
|
||||
random.reserve(10000);
|
||||
median.reserve(10000);
|
||||
for (int i = 0; i < 10000; ++i)
|
||||
{
|
||||
random.push_back(rand());
|
||||
m.insert(random.back());
|
||||
median.push_back(m.median());
|
||||
}
|
||||
m.clear();
|
||||
for (int i = 10000 - 100; i < 10000; ++i)
|
||||
{
|
||||
m.insert(random[i]);
|
||||
}
|
||||
ASSERT_EQ(median[10000-1], m.median());
|
||||
}
|
||||
|
||||
TEST(rolling_median, order)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(1000);
|
||||
std::vector<uint64_t> random;
|
||||
random.reserve(1000);
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
{
|
||||
random.push_back(rand());
|
||||
m.insert(random.back());
|
||||
}
|
||||
const uint64_t med = m.median();
|
||||
|
||||
std::sort(random.begin(), random.end(), [](uint64_t a, uint64_t b) { return a < b; });
|
||||
m.clear();
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
m.insert(random[i]);
|
||||
ASSERT_EQ(med, m.median());
|
||||
|
||||
std::sort(random.begin(), random.end(), [](uint64_t a, uint64_t b) { return a > b; });
|
||||
m.clear();
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
m.insert(random[i]);
|
||||
ASSERT_EQ(med, m.median());
|
||||
|
||||
std::shuffle(random.begin(), random.end(), std::default_random_engine(crypto::rand<unsigned>()));
|
||||
m.clear();
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
m.insert(random[i]);
|
||||
ASSERT_EQ(med, m.median());
|
||||
}
|
||||
|
||||
TEST(rolling_median, history_blind)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(10);
|
||||
|
||||
uint64_t median = 0;
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
{
|
||||
m.clear();
|
||||
int history_length = 743723 % (i+1);
|
||||
while (history_length--)
|
||||
m.insert(743284 % (i+1));
|
||||
for (int j = 0; j < 10; ++j)
|
||||
m.insert(8924829384 % (j+1));
|
||||
if (i == 0)
|
||||
median = m.median();
|
||||
else
|
||||
ASSERT_EQ(median, m.median());
|
||||
}
|
||||
}
|
||||
|
||||
TEST(rolling_median, size)
|
||||
{
|
||||
epee::misc_utils::rolling_median_t<uint64_t> m(10);
|
||||
|
||||
ASSERT_EQ(m.size(), 0);
|
||||
m.insert(1);
|
||||
ASSERT_EQ(m.size(), 1);
|
||||
m.insert(2);
|
||||
ASSERT_EQ(m.size(), 2);
|
||||
m.clear();
|
||||
ASSERT_EQ(m.size(), 0);
|
||||
for (int i = 0; i < 10; ++i)
|
||||
{
|
||||
m.insert(80 % (i + 1));
|
||||
ASSERT_EQ(m.size(), i + 1);
|
||||
}
|
||||
m.insert(1);
|
||||
ASSERT_EQ(m.size(), 10);
|
||||
m.insert(2);
|
||||
ASSERT_EQ(m.size(), 10);
|
||||
m.clear();
|
||||
ASSERT_EQ(m.size(), 0);
|
||||
m.insert(4);
|
||||
ASSERT_EQ(m.size(), 1);
|
||||
for (int i = 0; i < 1000; ++i)
|
||||
{
|
||||
m.insert(80 % (i + 1));
|
||||
ASSERT_EQ(m.size(), std::min<int>(10, i + 2));
|
||||
}
|
||||
}
|
Loading…
Add table
Add a link
Reference in a new issue