def test_cpu_bound_fork_operator_error():
print('##### test_cpu_bound_fork_operator_error #####')
try:
x = 1 + fork(operator_error_cpu)
print(x)
except:
given_traceback = traceback.format_exc()
if re.match(wanted_operator_traceback.strip(), given_traceback.strip()):
print('Traceback looks as desired.')
else:
print('Traceback do not look as desired:')
print(given_traceback.strip())
def test_io_bound_fork_runtime_error():
print('##### test_io_bound_fork_runtime_error #####')
try:
x = fork(runtime_error_io)
print(x)
except:
given_traceback = traceback.format_exc()
if re.match(wanted_runtime_traceback.strip(), given_traceback.strip()):
print('Traceback looks as desired.')
else:
print('Traceback do not look as desired:')
print(given_traceback.strip())
def test_cpu_bound_fork_contagious(n):
print('##### test_cpu_bound_fork_contagious #####')
start = time.time()
seq_results = 0
for i in [20]*n:
seq_results += fib(i)
str(seq_results)
end = time.time()
print('sequential:', end-start)
start = time.time()
par_results = 0
for i in [20]*n:
par_results += fork(fib, i)
str(par_results)
end = time.time()
print('parallel: ', end-start)
if seq_results == par_results:
print('results are equal')
else:
print('results are unequal')
print('sequential:', seq_results)
print('parallel: ', par_results)
def test_io_bound_fork_contagious(n):
print('##### test_io_bound_fork_contagious #####')
start = time.time()
seq_results = ''
for i in range(n):
seq_results += webservice()
str(seq_results)
end = time.time()
print('sequential:', end-start)
start = time.time()
par_results = ''
for i in range(n):
par_results += fork(webservice)
str(par_results)
end = time.time()
print('parallel: ', end-start)
if seq_results == par_results:
print('results are equal')
else:
print('results are unequal')
print('sequential:', seq_results)
print('parallel: ', par_results)
def test_cpu_bound_fork(n):
print('##### test_cpu_bound_fork #####')
start = time.time()
seq_results = []
for i in range(n):
seq_results += [fib(i)]
str(seq_results)
end = time.time()
print('sequential:', end-start)
start = time.time()
par_results = []
for i in range(n):
par_results += [fork(fib, i)]
str(par_results)
end = time.time()
print('parallel: ', end-start)
if seq_results == par_results:
print('results are equal')
else:
print('results are unequal')
print('sequential:', seq_results)
print('parallel: ', par_results)
def difficulty(node, db_handler):
try:
POW_FORK, FORK_AHEAD, FORK_DIFF = fork()
db_handler.execute(
db_handler.c,
"SELECT * FROM transactions WHERE reward != 0 ORDER BY block_height DESC LIMIT 2"
)
result = db_handler.c.fetchone()
timestamp_last = Decimal(result[1])
block_height = int(result[0])
node.last_block_timestamp = timestamp_last
#node.last_block = block_height do not fetch this here, could interfere with block saving
previous = db_handler.c.fetchone()
node.last_block_ago = int(time.time() - int(timestamp_last))
# Failsafe for regtest starting at block 1}
timestamp_before_last = timestamp_last if previous is None else Decimal(
previous[1])
db_handler.execute_param(db_handler.c, (
"SELECT timestamp FROM transactions WHERE block_height > ? AND reward != 0 ORDER BY timestamp ASC LIMIT 2"
), (block_height - 1441, ))
timestamp_1441 = Decimal(db_handler.c.fetchone()[0])
block_time_prev = (timestamp_before_last - timestamp_1441) / 1440
temp = db_handler.c.fetchone()
timestamp_1440 = timestamp_1441 if temp is None else Decimal(temp[0])
block_time = Decimal(timestamp_last - timestamp_1440) / 1440
db_handler.execute(
db_handler.c,
"SELECT difficulty FROM misc ORDER BY block_height DESC LIMIT 1")
diff_block_previous = Decimal(db_handler.c.fetchone()[0])
time_to_generate = timestamp_last - timestamp_before_last
if node.is_regnet:
return (float('%.10f' % regnet.REGNET_DIFF),
float('%.10f' % (regnet.REGNET_DIFF - 8)),
float(time_to_generate), float(regnet.REGNET_DIFF),
float(block_time), float(0), float(0), block_height)
hashrate = pow(2, diff_block_previous / Decimal(2.0)) / (
block_time * math.ceil(28 - diff_block_previous / Decimal(16.0)))
# Calculate new difficulty for desired blocktime of 60 seconds
target = Decimal(60.00)
##D0 = diff_block_previous
difficulty_new = Decimal(
(2 / math.log(2)) *
math.log(hashrate * target *
math.ceil(28 - diff_block_previous / Decimal(16.0))))
# Feedback controller
Kd = 10
difficulty_new = difficulty_new - Kd * (block_time - block_time_prev)
diff_adjustment = (difficulty_new - diff_block_previous
) / 720 # reduce by factor of 720
if diff_adjustment > Decimal(1.0):
diff_adjustment = Decimal(1.0)
difficulty_new_adjusted = quantize_ten(diff_block_previous +
diff_adjustment)
difficulty = difficulty_new_adjusted
if node.is_mainnet:
if block_height == POW_FORK - FORK_AHEAD:
limit_version(node)
if block_height == POW_FORK - 1:
difficulty = FORK_DIFF
if block_height == POW_FORK:
difficulty = FORK_DIFF
# Remove mainnet0018 from allowed
limit_version(node)
# disconnect our outgoing connections
diff_drop_time = Decimal(180)
if Decimal(time.time()) > Decimal(timestamp_last) + Decimal(
2 * diff_drop_time):
# Emergency diff drop
time_difference = quantize_two(
time.time()) - quantize_two(timestamp_last)
diff_dropped = quantize_ten(difficulty) - quantize_ten(1) \
- quantize_ten(10 * (time_difference - 2 * diff_drop_time) / diff_drop_time)
elif Decimal(time.time()
) > Decimal(timestamp_last) + Decimal(diff_drop_time):
time_difference = quantize_two(
time.time()) - quantize_two(timestamp_last)
diff_dropped = quantize_ten(difficulty) + quantize_ten(
1) - quantize_ten(time_difference / diff_drop_time)
else:
diff_dropped = difficulty
if difficulty < 50:
difficulty = 50
if diff_dropped < 50:
diff_dropped = 50
return (float('%.10f' % difficulty), float('%.10f' % diff_dropped),
float(time_to_generate), float(diff_block_previous),
float(block_time), float(hashrate), float(diff_adjustment),
block_height
) # need to keep float here for database inserts support
except: #new chain or regnet
difficulty = [24, 24, 0, 0, 0, 0, 0, 0]
return difficulty
import base64
import essentials
import hashlib
import staking
from fork import *
import mining
import mining_heavy3
import regnet
import mempool as mp
from essentials import db_to_drive #rework
from essentials import checkpoint_set #rework
from essentials import ledger_balance3 #rework
from difficulty import *
POW_FORK, FORK_AHEAD, FORK_DIFF = fork()
from Cryptodome.Hash import SHA
from Cryptodome.PublicKey import RSA
from Cryptodome.Signature import PKCS1_v1_5
def digest_block(node, data, sdef, peer_ip, db_handler):
"""node param for imports"""
class Transaction():
def __init__(self):
self.start_time_tx = 0
self.q_received_timestamp = 0
self.received_timestamp = "0.00"
self.received_address = None
self.received_recipient = None
# linux 才能运行fork
import os
import fork
import time
print('--尝试fork()进程--')
pid = fork() # 返回0 代表子进程， 反之代表主进程
print('进程ID', os.getpid(), 'hello...')
def cpu_a():
print('cpu_a')
for _ in range(30):
fork(cpu_b)
print('cpu_a end')
def io_b():
print('io_b')
for _ in range(30):
fork(io_c)
print('io_b end')
def io_a():
print('io_a')
for _ in range(30):
fork(io_b)
print('io_a end')
def cpu_b():
print('cpu_b')
for _ in range(30):
fork(cpu_c)
print('cpu_b end')
print('cpu_c')
pass
@io_bound
def io_a():
print('io_a')
for _ in range(30):
fork(io_b)
print('io_a end')
@io_bound
def io_b():
print('io_b')
for _ in range(30):
fork(io_c)
print('io_b end')
@io_bound
def io_c():
print('io_c')
pass
fork(cpu_a)
fork(io_a)
fork(fork, fork, fork, fork, fork, cpu_a)
fork(fork, fork, fork, fork, fork, io_a)
