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#!/usr/bin/env python
#
# Public Domain 2014-2019 MongoDB, Inc.
# Public Domain 2008-2014 WiredTiger, Inc.
#
# This is free and unencumbered software released into the public domain.
#
# Anyone is free to copy, modify, publish, use, compile, sell, or
# distribute this software, either in source code form or as a compiled
# binary, for any purpose, commercial or non-commercial, and by any
# means.
#
# In jurisdictions that recognize copyright laws, the author or authors
# of this software dedicate any and all copyright interest in the
# software to the public domain. We make this dedication for the benefit
# of the public at large and to the detriment of our heirs and
# successors. We intend this dedication to be an overt act of
# relinquishment in perpetuity of all present and future rights to this
# software under copyright law.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
# OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
# ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
# OTHER DEALINGS IN THE SOFTWARE.
import os, shutil
import helper, wiredtiger, wttest
from wiredtiger import stat
# test_log03.py
# test configuration for log.dirty_max
class test_log03(wttest.WiredTigerTestCase):
"""
Test log.dirty_max
"""
homedir = 'HOME'
uri = 'table:test_log03'
nentries = 20000
# Tests need to setup the connection in their own way.
def setUpConnectionOpen(self, dir):
return None
def setUpSessionOpen(self, conn):
return None
def populate(self):
big_str = 'A' * 10000
self.session.create(self.uri, "key_format=S,value_format=S")
cursor = self.session.open_cursor(self.uri)
for i in range(self.nentries):
cursor[str(i)] = big_str
cursor.close()
def fsync_stat(self):
cursor = self.session.open_cursor('statistics:', None, None)
result = cursor[stat.conn.fsync_io][2]
cursor.close()
return result
def with_log_sync(self, log_size, dirty_pct):
config = "cache_size=1G,create,statistics=(fast),log=(enabled"
config += ",file_max=" + str(log_size) + "M"
config += ",os_cache_dirty_pct=" + str(dirty_pct)
config += "),transaction_sync=(enabled=false,method=none)"
#self.tty('CONFIG: ' + config)
# Recreate a home directory each time so we have the log
# starting at zero. That makes our calculations easier.
shutil.rmtree(self.homedir, ignore_errors=True)
os.mkdir(self.homedir)
self.conn = self.wiredtiger_open(self.homedir, config)
self.session = self.conn.open_session(None)
self.populate()
result = self.fsync_stat()
self.session.close()
self.conn.close()
return result
def test_dirty_max(self):
# With this test, we have a baseline of syncs performed for 12M
# log files. Then we set dirty_max to values that are half,
# a third, a quarter and a fifth of the log file, and we would
# expect an increase of syncs each time. The number of syncs
# produced turns out to be a little variable, so we've picked
# conservative increases.
baseline = self.with_log_sync(12, 0)
#self.tty('baseline: ' + str(baseline))
for dirty_pct,increase in [50, 8], [33, 16], [25, 24], [20, 32]:
result = self.with_log_sync(12, dirty_pct)
#self.tty('tried: ' + str(dirty_pct) + ', got: ' + str(result))
self.assertGreater(result, baseline + increase)
if __name__ == '__main__':
wttest.run()
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