/usr/lib/python2.7/dist-packages/ZEO/tests/test_cache.py is in python-zodb 1:3.10.7-1.
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#
# Copyright (c) 2003 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""Basic unit tests for a client cache."""
from ZODB.utils import p64, repr_to_oid
import doctest
import os
import re
import string
import struct
import sys
import tempfile
import unittest
import ZEO.cache
import ZODB.tests.util
import zope.testing.setupstack
import zope.testing.renormalizing
import ZEO.cache
from ZODB.utils import p64, u64, z64
n1 = p64(1)
n2 = p64(2)
n3 = p64(3)
n4 = p64(4)
n5 = p64(5)
def hexprint(file):
file.seek(0)
data = file.read()
offset = 0
while data:
line, data = data[:16], data[16:]
printable = ""
hex = ""
for character in line:
if (character in string.printable
and not ord(character) in [12,13,9]):
printable += character
else:
printable += '.'
hex += character.encode('hex') + ' '
hex = hex[:24] + ' ' + hex[24:]
hex = hex.ljust(49)
printable = printable.ljust(16)
print '%08x %s |%s|' % (offset, hex, printable)
offset += 16
def oid(o):
repr = '%016x' % o
return repr_to_oid(repr)
tid = oid
class CacheTests(ZODB.tests.util.TestCase):
def setUp(self):
# The default cache size is much larger than we need here. Since
# testSerialization reads the entire file into a string, it's not
# good to leave it that big.
ZODB.tests.util.TestCase.setUp(self)
self.cache = ZEO.cache.ClientCache(size=1024**2)
def tearDown(self):
self.cache.close()
if self.cache.path:
os.remove(self.cache.path)
ZODB.tests.util.TestCase.tearDown(self)
def testLastTid(self):
self.assertEqual(self.cache.getLastTid(), z64)
self.cache.setLastTid(n2)
self.assertEqual(self.cache.getLastTid(), n2)
self.assertEqual(self.cache.getLastTid(), n2)
self.cache.setLastTid(n3)
self.assertEqual(self.cache.getLastTid(), n3)
# Check that setting tids out of order gives an error:
# the cache complains only when it's non-empty
self.cache.store(n1, n3, None, 'x')
self.assertRaises(ValueError, self.cache.setLastTid, n2)
def testLoad(self):
data1 = "data for n1"
self.assertEqual(self.cache.load(n1), None)
self.cache.store(n1, n3, None, data1)
self.assertEqual(self.cache.load(n1), (data1, n3))
def testInvalidate(self):
data1 = "data for n1"
self.cache.store(n1, n3, None, data1)
self.cache.invalidate(n2, n2)
self.cache.invalidate(n1, n4)
self.assertEqual(self.cache.load(n1), None)
self.assertEqual(self.cache.loadBefore(n1, n4),
(data1, n3, n4))
def testNonCurrent(self):
data1 = "data for n1"
data2 = "data for n2"
self.cache.store(n1, n4, None, data1)
self.cache.store(n1, n2, n3, data2)
# can't say anything about state before n2
self.assertEqual(self.cache.loadBefore(n1, n2), None)
# n3 is the upper bound of non-current record n2
self.assertEqual(self.cache.loadBefore(n1, n3), (data2, n2, n3))
# no data for between n2 and n3
self.assertEqual(self.cache.loadBefore(n1, n4), None)
self.cache.invalidate(n1, n5)
self.assertEqual(self.cache.loadBefore(n1, n5), (data1, n4, n5))
self.assertEqual(self.cache.loadBefore(n2, n4), None)
def testException(self):
self.cache.store(n1, n2, None, "data")
self.cache.store(n1, n2, None, "data")
self.assertRaises(ValueError,
self.cache.store,
n1, n3, None, "data")
def testEviction(self):
# Manually override the current maxsize
cache = ZEO.cache.ClientCache(None, 3395)
# Trivial test of eviction code. Doesn't test non-current
# eviction.
data = ["z" * i for i in range(100)]
for i in range(50):
n = p64(i)
cache.store(n, n, None, data[i])
self.assertEquals(len(cache), i + 1)
# The cache is now almost full. The next insert
# should delete some objects.
n = p64(50)
cache.store(n, n, None, data[51])
self.assert_(len(cache) < 51)
# TODO: Need to make sure eviction of non-current data
# are handled correctly.
def testSerialization(self):
self.cache.store(n1, n2, None, "data for n1")
self.cache.store(n3, n3, n4, "non-current data for n3")
self.cache.store(n3, n4, n5, "more non-current data for n3")
path = tempfile.mktemp()
# Copy data from self.cache into path, reaching into the cache
# guts to make the copy.
dst = open(path, "wb+")
src = self.cache.f
src.seek(0)
dst.write(src.read(self.cache.maxsize))
dst.close()
copy = ZEO.cache.ClientCache(path)
# Verify that internals of both objects are the same.
# Could also test that external API produces the same results.
eq = self.assertEqual
eq(copy.getLastTid(), self.cache.getLastTid())
eq(len(copy), len(self.cache))
eq(dict(copy.current), dict(self.cache.current))
eq(dict([(k, dict(v)) for (k, v) in copy.noncurrent.items()]),
dict([(k, dict(v)) for (k, v) in self.cache.noncurrent.items()]),
)
def testCurrentObjectLargerThanCache(self):
if self.cache.path:
os.remove(self.cache.path)
self.cache = ZEO.cache.ClientCache(size=50)
# We store an object that is a bit larger than the cache can handle.
self.cache.store(n1, n2, None, "x"*64)
# We can see that it was not stored.
self.assertEquals(None, self.cache.load(n1))
# If an object cannot be stored in the cache, it must not be
# recorded as current.
self.assert_(n1 not in self.cache.current)
# Regression test: invalidation must still work.
self.cache.invalidate(n1, n2)
def testOldObjectLargerThanCache(self):
if self.cache.path:
os.remove(self.cache.path)
cache = ZEO.cache.ClientCache(size=50)
# We store an object that is a bit larger than the cache can handle.
cache.store(n1, n2, n3, "x"*64)
# We can see that it was not stored.
self.assertEquals(None, cache.load(n1))
# If an object cannot be stored in the cache, it must not be
# recorded as non-current.
self.assert_(1 not in cache.noncurrent)
def testVeryLargeCaches(self):
cache = ZEO.cache.ClientCache('cache', size=(1<<32)+(1<<20))
cache.store(n1, n2, None, "x")
cache.close()
cache = ZEO.cache.ClientCache('cache', size=(1<<33)+(1<<20))
self.assertEquals(cache.load(n1), ('x', n2))
cache.close()
def testConversionOfLargeFreeBlocks(self):
f = open('cache', 'wb')
f.write(ZEO.cache.magic+
'\0'*8 +
'f'+struct.pack(">I", (1<<32)-12)
)
f.seek((1<<32)-1)
f.write('x')
f.close()
cache = ZEO.cache.ClientCache('cache', size=1<<32)
cache.close()
cache = ZEO.cache.ClientCache('cache', size=1<<32)
cache.close()
f = open('cache', 'rb')
f.seek(12)
self.assertEquals(f.read(1), 'f')
self.assertEquals(struct.unpack(">I", f.read(4))[0],
ZEO.cache.max_block_size)
f.close()
if not sys.platform.startswith('linux'):
# On platforms without sparse files, these tests are just way
# too hard on the disk and take too long (especially in a windows
# VM).
del testVeryLargeCaches
del testConversionOfLargeFreeBlocks
def test_clear_zeo_cache(self):
cache = self.cache
for i in range(10):
cache.store(p64(i), n2, None, str(i))
cache.store(p64(i), n1, n2, str(i)+'old')
self.assertEqual(len(cache), 20)
self.assertEqual(cache.load(n3), ('3', n2))
self.assertEqual(cache.loadBefore(n3, n2), ('3old', n1, n2))
cache.clear()
self.assertEqual(len(cache), 0)
self.assertEqual(cache.load(n3), None)
self.assertEqual(cache.loadBefore(n3, n2), None)
def testChangingCacheSize(self):
# start with a small cache
data = 'x'
recsize = ZEO.cache.allocated_record_overhead+len(data)
for extra in (2, recsize-2):
cache = ZEO.cache.ClientCache(
'cache', size=ZEO.cache.ZEC_HEADER_SIZE+100*recsize+extra)
for i in range(100):
cache.store(p64(i), n1, None, data)
self.assertEquals(len(cache), 100)
self.assertEquals(os.path.getsize(
'cache'), ZEO.cache.ZEC_HEADER_SIZE+100*recsize+extra)
# Now make it smaller
cache.close()
small = 50
cache = ZEO.cache.ClientCache(
'cache', size=ZEO.cache.ZEC_HEADER_SIZE+small*recsize+extra)
self.assertEquals(len(cache), small)
self.assertEquals(os.path.getsize(
'cache'), ZEO.cache.ZEC_HEADER_SIZE+small*recsize+extra)
self.assertEquals(set(u64(oid) for (oid, tid) in cache.contents()),
set(range(small)))
for i in range(100, 110):
cache.store(p64(i), n1, None, data)
# We use small-1 below because an extra object gets
# evicted because of the optimization to assure that we
# always get a free block after a new allocated block.
expected_len = small - 1
self.assertEquals(len(cache), expected_len)
expected_oids = set(range(11, 50)+range(100, 110))
self.assertEquals(
set(u64(oid) for (oid, tid) in cache.contents()),
expected_oids)
# Make sure we can reopen with same size
cache.close()
cache = ZEO.cache.ClientCache(
'cache', size=ZEO.cache.ZEC_HEADER_SIZE+small*recsize+extra)
self.assertEquals(len(cache), expected_len)
self.assertEquals(set(u64(oid) for (oid, tid) in cache.contents()),
expected_oids)
# Now make it bigger
cache.close()
large = 150
cache = ZEO.cache.ClientCache(
'cache', size=ZEO.cache.ZEC_HEADER_SIZE+large*recsize+extra)
self.assertEquals(len(cache), expected_len)
self.assertEquals(os.path.getsize(
'cache'), ZEO.cache.ZEC_HEADER_SIZE+large*recsize+extra)
self.assertEquals(set(u64(oid) for (oid, tid) in cache.contents()),
expected_oids)
for i in range(200, 305):
cache.store(p64(i), n1, None, data)
# We use large-2 for the same reason we used small-1 above.
expected_len = large-2
self.assertEquals(len(cache), expected_len)
expected_oids = set(range(11, 50)+range(106, 110)+range(200, 305))
self.assertEquals(set(u64(oid) for (oid, tid) in cache.contents()),
expected_oids)
# Make sure we can reopen with same size
cache.close()
cache = ZEO.cache.ClientCache(
'cache', size=ZEO.cache.ZEC_HEADER_SIZE+large*recsize+extra)
self.assertEquals(len(cache), expected_len)
self.assertEquals(set(u64(oid) for (oid, tid) in cache.contents()),
expected_oids)
# Cleanup
cache.close()
os.remove('cache')
def testSetAnyLastTidOnEmptyCache(self):
self.cache.setLastTid(p64(5))
self.cache.setLastTid(p64(5))
self.cache.setLastTid(p64(3))
self.cache.setLastTid(p64(4))
def kill_does_not_cause_cache_corruption():
r"""
If we kill a process while a cache is being written to, the cache
isn't corrupted. To see this, we'll write a little script that
writes records to a cache file repeatedly.
>>> import os, random, sys, time
>>> open('t', 'w').write('''
... import os, random, sys, thread, time
... sys.path = %r
...
... def suicide():
... time.sleep(random.random()/10)
... os._exit(0)
...
... import ZEO.cache
... from ZODB.utils import p64
... cache = ZEO.cache.ClientCache('cache')
... oid = 0
... t = 0
... thread.start_new_thread(suicide, ())
... while 1:
... oid += 1
... t += 1
... data = 'X' * random.randint(5000,25000)
... cache.store(p64(oid), p64(t), None, data)
...
... ''' % sys.path)
>>> for i in range(10):
... _ = os.spawnl(os.P_WAIT, sys.executable, sys.executable, 't')
... if os.path.exists('cache'):
... cache = ZEO.cache.ClientCache('cache')
... cache.close()
... os.remove('cache')
... os.remove('cache.lock')
"""
def full_cache_is_valid():
r"""
If we fill up the cache without any free space, the cache can
still be used.
>>> import ZEO.cache
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> data = 'X' * (1000 - ZEO.cache.ZEC_HEADER_SIZE - 41)
>>> cache.store(p64(1), p64(1), None, data)
>>> cache.close()
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> cache.store(p64(2), p64(2), None, 'XXX')
>>> cache.close()
"""
def cannot_open_same_cache_file_twice():
r"""
>>> import ZEO.cache
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> cache2 = ZEO.cache.ClientCache('cache', 1000)
Traceback (most recent call last):
...
LockError: Couldn't lock 'cache.lock'
>>> cache.close()
"""
def thread_safe():
r"""
>>> import ZEO.cache, ZODB.utils
>>> cache = ZEO.cache.ClientCache('cache', 1000000)
>>> for i in range(100):
... cache.store(ZODB.utils.p64(i), ZODB.utils.p64(1), None, '0')
>>> import random, sys, threading
>>> random = random.Random(0)
>>> stop = False
>>> read_failure = None
>>> def read_thread():
... def pick_oid():
... return ZODB.utils.p64(random.randint(0,99))
...
... try:
... while not stop:
... cache.load(pick_oid())
... cache.loadBefore(pick_oid(), ZODB.utils.p64(2))
... except:
... global read_failure
... read_failure = sys.exc_info()
>>> thread = threading.Thread(target=read_thread)
>>> thread.start()
>>> for tid in range(2,10):
... for oid in range(100):
... oid = ZODB.utils.p64(oid)
... cache.invalidate(oid, ZODB.utils.p64(tid))
... cache.store(oid, ZODB.utils.p64(tid), None, str(tid))
>>> stop = True
>>> thread.join()
>>> if read_failure:
... print 'Read failure:'
... import traceback
... traceback.print_exception(*read_failure)
>>> expected = '9', ZODB.utils.p64(9)
>>> for oid in range(100):
... loaded = cache.load(ZODB.utils.p64(oid))
... if loaded != expected:
... print oid, loaded
>>> cache.close()
"""
def broken_non_current():
r"""
In production, we saw a situation where an _del_noncurrent raused
a key error when trying to free space, causing the cache to become
unusable. I can't see why this would occur, but added a logging
exception handler so, in the future, we'll still see cases in the
log, but will ignore the error and keep going.
>>> import ZEO.cache, ZODB.utils, logging, sys
>>> logger = logging.getLogger('ZEO.cache')
>>> logger.setLevel(logging.ERROR)
>>> handler = logging.StreamHandler(sys.stdout)
>>> logger.addHandler(handler)
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> cache.store(ZODB.utils.p64(1), ZODB.utils.p64(1), None, '0')
>>> cache.invalidate(ZODB.utils.p64(1), ZODB.utils.p64(2))
>>> cache._del_noncurrent(ZODB.utils.p64(1), ZODB.utils.p64(2))
... # doctest: +NORMALIZE_WHITESPACE
Couldn't find non-current
('\x00\x00\x00\x00\x00\x00\x00\x01', '\x00\x00\x00\x00\x00\x00\x00\x02')
>>> cache._del_noncurrent(ZODB.utils.p64(1), ZODB.utils.p64(1))
>>> cache._del_noncurrent(ZODB.utils.p64(1), ZODB.utils.p64(1)) #
... # doctest: +NORMALIZE_WHITESPACE
Couldn't find non-current
('\x00\x00\x00\x00\x00\x00\x00\x01', '\x00\x00\x00\x00\x00\x00\x00\x01')
>>> logger.setLevel(logging.NOTSET)
>>> logger.removeHandler(handler)
>>> cache.close()
"""
# def bad_magic_number(): See rename_bad_cache_file
def cache_trace_analysis():
r"""
Check to make sure the cache analysis scripts work.
>>> import time
>>> timetime = time.time
>>> now = 1278864701.5
>>> time.time = lambda : now
>>> os.environ["ZEO_CACHE_TRACE"] = 'yes'
>>> import random
>>> random = random.Random(42)
>>> history = []
>>> serial = 1
>>> for i in range(1000):
... serial += 1
... oid = random.randint(i+1000, i+6000)
... history.append(('s', p64(oid), p64(serial),
... 'x'*random.randint(200,2000)))
... for j in range(10):
... oid = random.randint(i+1000, i+6000)
... history.append(('l', p64(oid), p64(serial),
... 'x'*random.randint(200,2000)))
>>> def cache_run(name, size):
... serial = 1
... random.seed(42)
... global now
... now = 1278864701.5
... cache = ZEO.cache.ClientCache(name, size*(1<<20))
... for action, oid, serial, data in history:
... now += 1
... if action == 's':
... cache.invalidate(oid, serial)
... cache.store(oid, serial, None, data)
... else:
... v = cache.load(oid)
... if v is None:
... cache.store(oid, serial, None, data)
... cache.close()
>>> cache_run('cache', 2)
>>> import ZEO.scripts.cache_stats, ZEO.scripts.cache_simul
>>> def ctime(t):
... return time.asctime(time.gmtime(t-3600*4))
>>> ZEO.scripts.cache_stats.ctime = ctime
>>> ZEO.scripts.cache_simul.ctime = ctime
############################################################
Stats
>>> ZEO.scripts.cache_stats.main(['cache.trace'])
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 291 19 609 35.6%
Jul 11 13:00-14 818 295 36 605 36.1%
Jul 11 13:15-29 818 277 31 623 33.9%
Jul 11 13:30-44 819 276 29 624 33.7%
Jul 11 13:45-59 818 251 25 649 30.7%
Jul 11 14:00-14 818 295 27 605 36.1%
Jul 11 14:15-29 818 262 33 638 32.0%
Jul 11 14:30-44 818 297 32 603 36.3%
Jul 11 14:45-59 819 268 23 632 32.7%
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15-15 2 1 0 1 50.0%
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Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
>>> ZEO.scripts.cache_stats.main('-q cache.trace'.split())
loads hits inv(h) writes hitrate
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
>>> ZEO.scripts.cache_stats.main('-v cache.trace'.split())
... # doctest: +ELLIPSIS
loads hits inv(h) writes hitrate
Jul 11 12:11:41 00 '' 0000000000000000 0000000000000000 -
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11:42 10 1065 0000000000000002 0000000000000000 -
Jul 11 12:11:42 52 1065 0000000000000002 0000000000000000 - 245
Jul 11 12:11:43 20 947 0000000000000000 0000000000000000 -
Jul 11 12:11:43 52 947 0000000000000002 0000000000000000 - 602
Jul 11 12:11:44 20 124b 0000000000000000 0000000000000000 -
Jul 11 12:11:44 52 124b 0000000000000002 0000000000000000 - 1418
...
Jul 11 15:14:55 52 10cc 00000000000003e9 0000000000000000 - 1306
Jul 11 15:14:56 20 18a7 0000000000000000 0000000000000000 -
Jul 11 15:14:56 52 18a7 00000000000003e9 0000000000000000 - 1610
Jul 11 15:14:57 22 18b5 000000000000031d 0000000000000000 - 1636
Jul 11 15:14:58 20 b8a 0000000000000000 0000000000000000 -
Jul 11 15:14:58 52 b8a 00000000000003e9 0000000000000000 - 838
Jul 11 15:14:59 22 1085 0000000000000357 0000000000000000 - 217
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15:00 22 1072 000000000000037e 0000000000000000 - 204
Jul 11 15:15:01 20 16c5 0000000000000000 0000000000000000 -
Jul 11 15:15:01 52 16c5 00000000000003e9 0000000000000000 - 1712
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
>>> ZEO.scripts.cache_stats.main('-h cache.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 291 19 609 35.6%
Jul 11 13:00-14 818 295 36 605 36.1%
Jul 11 13:15-29 818 277 31 623 33.9%
Jul 11 13:30-44 819 276 29 624 33.7%
Jul 11 13:45-59 818 251 25 649 30.7%
Jul 11 14:00-14 818 295 27 605 36.1%
Jul 11 14:15-29 818 262 33 638 32.0%
Jul 11 14:30-44 818 297 32 603 36.3%
Jul 11 14:45-59 819 268 23 632 32.7%
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
<BLANKLINE>
Histogram of object load frequency
Unique oids: 4,585
Total loads: 10,000
loads objects %obj %load %cum
1 1,645 35.9% 16.4% 16.4%
2 1,465 32.0% 29.3% 45.8%
3 809 17.6% 24.3% 70.0%
4 430 9.4% 17.2% 87.2%
5 167 3.6% 8.3% 95.6%
6 49 1.1% 2.9% 98.5%
7 12 0.3% 0.8% 99.3%
8 7 0.2% 0.6% 99.9%
9 1 0.0% 0.1% 100.0%
>>> ZEO.scripts.cache_stats.main('-s cache.trace'.split())
... # doctest: +ELLIPSIS
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 291 19 609 35.6%
Jul 11 13:00-14 818 295 36 605 36.1%
Jul 11 13:15-29 818 277 31 623 33.9%
Jul 11 13:30-44 819 276 29 624 33.7%
Jul 11 13:45-59 818 251 25 649 30.7%
Jul 11 14:00-14 818 295 27 605 36.1%
Jul 11 14:15-29 818 262 33 638 32.0%
Jul 11 14:30-44 818 297 32 603 36.3%
Jul 11 14:45-59 819 268 23 632 32.7%
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
<BLANKLINE>
Histograms of object sizes
<BLANKLINE>
<BLANKLINE>
Unique sizes written: 1,782
size objs writes
200 5 5
201 4 4
202 4 4
203 1 1
204 1 1
205 6 6
206 8 8
...
1,995 1 2
1,996 2 2
1,997 1 1
1,998 2 2
1,999 2 4
2,000 1 1
>>> ZEO.scripts.cache_stats.main('-S cache.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 291 19 609 35.6%
Jul 11 13:00-14 818 295 36 605 36.1%
Jul 11 13:15-29 818 277 31 623 33.9%
Jul 11 13:30-44 819 276 29 624 33.7%
Jul 11 13:45-59 818 251 25 649 30.7%
Jul 11 14:00-14 818 295 27 605 36.1%
Jul 11 14:15-29 818 262 33 638 32.0%
Jul 11 14:30-44 818 297 32 603 36.3%
Jul 11 14:45-59 819 268 23 632 32.7%
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15-15 2 1 0 1 50.0%
>>> ZEO.scripts.cache_stats.main('-X cache.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 291 19 609 35.6%
Jul 11 13:00-14 818 295 36 605 36.1%
Jul 11 13:15-29 818 277 31 623 33.9%
Jul 11 13:30-44 819 276 29 624 33.7%
Jul 11 13:45-59 818 251 25 649 30.7%
Jul 11 14:00-14 818 295 27 605 36.1%
Jul 11 14:15-29 818 262 33 638 32.0%
Jul 11 14:30-44 818 297 32 603 36.3%
Jul 11 14:45-59 819 268 23 632 32.7%
Jul 11 15:00-14 818 291 30 609 35.6%
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
>>> ZEO.scripts.cache_stats.main('-i 5 cache.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-19 272 19 2 281 7.0%
Jul 11 12:20-24 273 35 5 265 12.8%
Jul 11 12:25-29 273 53 2 247 19.4%
Jul 11 12:30-34 272 60 8 240 22.1%
Jul 11 12:35-39 273 68 6 232 24.9%
Jul 11 12:40-44 273 85 8 215 31.1%
Jul 11 12:45-49 273 84 6 216 30.8%
Jul 11 12:50-54 272 104 9 196 38.2%
Jul 11 12:55-59 273 103 4 197 37.7%
Jul 11 13:00-04 273 92 12 208 33.7%
Jul 11 13:05-09 273 103 8 197 37.7%
Jul 11 13:10-14 272 100 16 200 36.8%
Jul 11 13:15-19 273 91 11 209 33.3%
Jul 11 13:20-24 273 96 9 204 35.2%
Jul 11 13:25-29 272 90 11 210 33.1%
Jul 11 13:30-34 273 82 14 218 30.0%
Jul 11 13:35-39 273 102 9 198 37.4%
Jul 11 13:40-44 273 92 6 208 33.7%
Jul 11 13:45-49 272 82 6 218 30.1%
Jul 11 13:50-54 273 83 8 217 30.4%
Jul 11 13:55-59 273 86 11 214 31.5%
Jul 11 14:00-04 273 95 11 205 34.8%
Jul 11 14:05-09 272 91 10 209 33.5%
Jul 11 14:10-14 273 109 6 191 39.9%
Jul 11 14:15-19 273 89 9 211 32.6%
Jul 11 14:20-24 272 84 16 216 30.9%
Jul 11 14:25-29 273 89 8 211 32.6%
Jul 11 14:30-34 273 97 12 203 35.5%
Jul 11 14:35-39 273 93 10 207 34.1%
Jul 11 14:40-44 272 107 10 193 39.3%
Jul 11 14:45-49 273 80 8 220 29.3%
Jul 11 14:50-54 273 100 8 200 36.6%
Jul 11 14:55-59 273 88 7 212 32.2%
Jul 11 15:00-04 272 99 8 201 36.4%
Jul 11 15:05-09 273 95 11 205 34.8%
Jul 11 15:10-14 273 97 11 203 35.5%
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 18,876 trace records (641,776 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (58.3%), average size 1108 bytes
Hit rate: 31.2% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
682 10 invalidate (miss)
318 1c invalidate (hit, saving non-current)
6,875 20 load (miss)
3,125 22 load (hit)
7,875 52 store (current, non-version)
>>> ZEO.scripts.cache_simul.main('-s 2 -i 5 cache.trace'.split())
CircularCacheSimulation, cache size 2,097,152 bytes
START TIME DUR. LOADS HITS INVALS WRITES HITRATE EVICTS INUSE
Jul 11 12:11 3:17 180 1 2 197 0.6% 0 10.7
Jul 11 12:15 4:59 272 19 2 281 7.0% 0 26.4
Jul 11 12:20 4:59 273 35 5 265 12.8% 0 40.4
Jul 11 12:25 4:59 273 53 2 247 19.4% 0 54.8
Jul 11 12:30 4:59 272 60 8 240 22.1% 0 67.1
Jul 11 12:35 4:59 273 68 6 232 24.9% 0 79.8
Jul 11 12:40 4:59 273 85 8 215 31.1% 0 91.4
Jul 11 12:45 4:59 273 84 6 216 30.8% 77 99.1
Jul 11 12:50 4:59 272 104 9 196 38.2% 196 98.9
Jul 11 12:55 4:59 273 104 4 196 38.1% 188 99.1
Jul 11 13:00 4:59 273 92 12 208 33.7% 213 99.3
Jul 11 13:05 4:59 273 103 8 197 37.7% 190 99.0
Jul 11 13:10 4:59 272 100 16 200 36.8% 203 99.2
Jul 11 13:15 4:59 273 91 11 209 33.3% 222 98.7
Jul 11 13:20 4:59 273 96 9 204 35.2% 210 99.2
Jul 11 13:25 4:59 272 89 11 211 32.7% 212 99.1
Jul 11 13:30 4:59 273 82 14 218 30.0% 220 99.1
Jul 11 13:35 4:59 273 101 9 199 37.0% 191 99.5
Jul 11 13:40 4:59 273 92 6 208 33.7% 214 99.4
Jul 11 13:45 4:59 272 80 6 220 29.4% 217 99.3
Jul 11 13:50 4:59 273 81 8 219 29.7% 214 99.2
Jul 11 13:55 4:59 273 86 11 214 31.5% 208 98.8
Jul 11 14:00 4:59 273 95 11 205 34.8% 188 99.3
Jul 11 14:05 4:59 272 93 10 207 34.2% 207 99.3
Jul 11 14:10 4:59 273 110 6 190 40.3% 198 98.8
Jul 11 14:15 4:59 273 91 9 209 33.3% 209 99.1
Jul 11 14:20 4:59 272 85 16 215 31.2% 210 99.3
Jul 11 14:25 4:59 273 89 8 211 32.6% 226 99.3
Jul 11 14:30 4:59 273 96 12 204 35.2% 214 99.3
Jul 11 14:35 4:59 273 90 10 210 33.0% 213 99.3
Jul 11 14:40 4:59 272 106 10 194 39.0% 196 98.8
Jul 11 14:45 4:59 273 80 8 220 29.3% 230 99.0
Jul 11 14:50 4:59 273 99 8 201 36.3% 202 99.0
Jul 11 14:55 4:59 273 87 8 213 31.9% 205 99.4
Jul 11 15:00 4:59 272 98 8 202 36.0% 211 99.3
Jul 11 15:05 4:59 273 93 11 207 34.1% 198 99.2
Jul 11 15:10 4:59 273 96 11 204 35.2% 184 99.2
Jul 11 15:15 1 2 1 0 1 50.0% 1 99.2
--------------------------------------------------------------------------
Jul 11 12:45 2:30:01 8184 2794 286 6208 34.1% 6067 99.2
>>> cache_run('cache4', 4)
>>> ZEO.scripts.cache_stats.main('cache4.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 213 22 687 26.0%
Jul 11 12:45-59 818 322 23 578 39.4%
Jul 11 13:00-14 818 381 43 519 46.6%
Jul 11 13:15-29 818 450 44 450 55.0%
Jul 11 13:30-44 819 503 47 397 61.4%
Jul 11 13:45-59 818 496 49 404 60.6%
Jul 11 14:00-14 818 516 48 384 63.1%
Jul 11 14:15-29 818 532 59 368 65.0%
Jul 11 14:30-44 818 516 51 384 63.1%
Jul 11 14:45-59 819 529 53 371 64.6%
Jul 11 15:00-14 818 515 49 385 63.0%
Jul 11 15:15-15 2 2 0 0 100.0%
<BLANKLINE>
Read 16,918 trace records (575,204 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (65.0%), average size 1104 bytes
Hit rate: 50.8% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
501 10 invalidate (miss)
499 1c invalidate (hit, saving non-current)
4,917 20 load (miss)
5,083 22 load (hit)
5,917 52 store (current, non-version)
>>> ZEO.scripts.cache_simul.main('-s 4 cache.trace'.split())
CircularCacheSimulation, cache size 4,194,304 bytes
START TIME DUR. LOADS HITS INVALS WRITES HITRATE EVICTS INUSE
Jul 11 12:11 3:17 180 1 2 197 0.6% 0 5.4
Jul 11 12:15 14:59 818 107 9 793 13.1% 0 27.4
Jul 11 12:30 14:59 818 213 22 687 26.0% 0 45.7
Jul 11 12:45 14:59 818 322 23 578 39.4% 0 61.4
Jul 11 13:00 14:59 818 381 43 519 46.6% 0 75.8
Jul 11 13:15 14:59 818 450 44 450 55.0% 0 88.2
Jul 11 13:30 14:59 819 503 47 397 61.4% 36 98.2
Jul 11 13:45 14:59 818 496 49 404 60.6% 388 98.5
Jul 11 14:00 14:59 818 515 48 385 63.0% 376 98.3
Jul 11 14:15 14:59 818 529 58 371 64.7% 391 98.1
Jul 11 14:30 14:59 818 511 51 389 62.5% 376 98.5
Jul 11 14:45 14:59 819 529 53 371 64.6% 410 97.9
Jul 11 15:00 14:59 818 512 49 388 62.6% 379 97.7
Jul 11 15:15 1 2 2 0 0 100.0% 0 97.7
--------------------------------------------------------------------------
Jul 11 13:30 1:45:01 5730 3597 355 2705 62.8% 2356 97.7
>>> cache_run('cache1', 1)
>>> ZEO.scripts.cache_stats.main('cache1.trace'.split())
loads hits inv(h) writes hitrate
Jul 11 12:11-11 0 0 0 0 n/a
Jul 11 12:11:41 ==================== Restart ====================
Jul 11 12:11-14 180 1 2 197 0.6%
Jul 11 12:15-29 818 107 9 793 13.1%
Jul 11 12:30-44 818 160 16 740 19.6%
Jul 11 12:45-59 818 158 8 742 19.3%
Jul 11 13:00-14 818 141 21 759 17.2%
Jul 11 13:15-29 818 128 17 772 15.6%
Jul 11 13:30-44 819 151 13 749 18.4%
Jul 11 13:45-59 818 120 17 780 14.7%
Jul 11 14:00-14 818 159 17 741 19.4%
Jul 11 14:15-29 818 141 13 759 17.2%
Jul 11 14:30-44 818 157 16 743 19.2%
Jul 11 14:45-59 819 133 13 767 16.2%
Jul 11 15:00-14 818 158 10 742 19.3%
Jul 11 15:15-15 2 1 0 1 50.0%
<BLANKLINE>
Read 20,286 trace records (689,716 bytes) in 0.0 seconds
Versions: 0 records used a version
First time: Sun Jul 11 12:11:41 2010
Last time: Sun Jul 11 15:15:01 2010
Duration: 11,000 seconds
Data recs: 11,000 (54.2%), average size 1105 bytes
Hit rate: 17.1% (load hits / loads)
<BLANKLINE>
Count Code Function (action)
1 00 _setup_trace (initialization)
828 10 invalidate (miss)
172 1c invalidate (hit, saving non-current)
8,285 20 load (miss)
1,715 22 load (hit)
9,285 52 store (current, non-version)
>>> ZEO.scripts.cache_simul.main('-s 1 cache.trace'.split())
CircularCacheSimulation, cache size 1,048,576 bytes
START TIME DUR. LOADS HITS INVALS WRITES HITRATE EVICTS INUSE
Jul 11 12:11 3:17 180 1 2 197 0.6% 0 21.5
Jul 11 12:15 14:59 818 107 9 793 13.1% 96 99.6
Jul 11 12:30 14:59 818 160 16 740 19.6% 724 99.6
Jul 11 12:45 14:59 818 158 8 742 19.3% 741 99.2
Jul 11 13:00 14:59 818 140 21 760 17.1% 771 99.5
Jul 11 13:15 14:59 818 125 17 775 15.3% 781 99.6
Jul 11 13:30 14:59 819 147 13 753 17.9% 748 99.5
Jul 11 13:45 14:59 818 120 17 780 14.7% 763 99.5
Jul 11 14:00 14:59 818 159 17 741 19.4% 728 99.4
Jul 11 14:15 14:59 818 141 13 759 17.2% 787 99.6
Jul 11 14:30 14:59 818 150 15 750 18.3% 755 99.2
Jul 11 14:45 14:59 819 132 13 768 16.1% 771 99.5
Jul 11 15:00 14:59 818 154 10 746 18.8% 723 99.2
Jul 11 15:15 1 2 1 0 1 50.0% 0 99.3
--------------------------------------------------------------------------
Jul 11 12:15 3:00:01 9820 1694 169 9108 17.3% 8388 99.3
Cleanup:
>>> del os.environ["ZEO_CACHE_TRACE"]
>>> time.time = timetime
>>> ZEO.scripts.cache_stats.ctime = time.ctime
>>> ZEO.scripts.cache_simul.ctime = time.ctime
"""
def cache_simul_properly_handles_load_miss_after_eviction_and_inval():
r"""
Set up evicted and then invalidated oid
>>> os.environ["ZEO_CACHE_TRACE"] = 'yes'
>>> cache = ZEO.cache.ClientCache('cache', 1<<21)
>>> cache.store(p64(1), p64(1), None, 'x')
>>> for i in range(10):
... cache.store(p64(2+i), p64(1), None, 'x'*(1<<19)) # Evict 1
>>> cache.store(p64(1), p64(1), None, 'x')
>>> cache.invalidate(p64(1), p64(2))
>>> cache.load(p64(1))
>>> cache.close()
Now try to do simulation:
>>> import ZEO.scripts.cache_simul
>>> ZEO.scripts.cache_simul.main('-s 1 cache.trace'.split())
... # doctest: +ELLIPSIS +NORMALIZE_WHITESPACE
CircularCacheSimulation, cache size 1,048,576 bytes
START TIME DUR. LOADS HITS INVALS WRITES HITRATE EVICTS INUSE
... 1 0 1 12 0.0% 10 50.0
--------------------------------------------------------------------------
... 1 0 1 12 0.0% 10 50.0
>>> del os.environ["ZEO_CACHE_TRACE"]
"""
def invalidations_with_current_tid_dont_wreck_cache():
"""
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> cache.store(p64(1), p64(1), None, 'data')
>>> import logging, sys
>>> handler = logging.StreamHandler(sys.stdout)
>>> logging.getLogger().addHandler(handler)
>>> old_level = logging.getLogger().getEffectiveLevel()
>>> logging.getLogger().setLevel(logging.WARNING)
>>> cache.invalidate(p64(1), p64(1))
Ignoring invalidation with same tid as current
>>> cache.close()
>>> cache = ZEO.cache.ClientCache('cache', 1000)
>>> cache.close()
>>> logging.getLogger().removeHandler(handler)
>>> logging.getLogger().setLevel(old_level)
"""
def rename_bad_cache_file():
"""
An attempt to open a bad cache file will cause it to be dropped and recreated.
>>> open('cache', 'w').write('x'*100)
>>> import logging, sys
>>> handler = logging.StreamHandler(sys.stdout)
>>> logging.getLogger().addHandler(handler)
>>> old_level = logging.getLogger().getEffectiveLevel()
>>> logging.getLogger().setLevel(logging.WARNING)
>>> cache = ZEO.cache.ClientCache('cache', 1000) # doctest: +ELLIPSIS
Moving bad cache file to 'cache.bad'.
Traceback (most recent call last):
...
ValueError: unexpected magic number: 'xxxx'
>>> cache.store(p64(1), p64(1), None, 'data')
>>> cache.close()
>>> f = open('cache')
>>> f.seek(0, 2)
>>> print f.tell()
1000
>>> f.close()
>>> open('cache', 'w').write('x'*200)
>>> cache = ZEO.cache.ClientCache('cache', 1000) # doctest: +ELLIPSIS
Removing bad cache file: 'cache' (prev bad exists).
Traceback (most recent call last):
...
ValueError: unexpected magic number: 'xxxx'
>>> cache.store(p64(1), p64(1), None, 'data')
>>> cache.close()
>>> f = open('cache')
>>> f.seek(0, 2)
>>> print f.tell()
1000
>>> f.close()
>>> f = open('cache.bad')
>>> f.seek(0, 2)
>>> print f.tell()
100
>>> f.close()
>>> logging.getLogger().removeHandler(handler)
>>> logging.getLogger().setLevel(old_level)
"""
def test_suite():
suite = unittest.TestSuite()
suite.addTest(unittest.makeSuite(CacheTests))
suite.addTest(
doctest.DocTestSuite(
setUp=zope.testing.setupstack.setUpDirectory,
tearDown=zope.testing.setupstack.tearDown,
checker=zope.testing.renormalizing.RENormalizing([
(re.compile(r'31\.3%'), '31.2%'),
]),
)
)
return suite
|