zc.monitorcache

zc.montorcache is a zc.z3monitor plugin that allows one to modify or check the cache size (in objects or bytes) of a running instance.

>>> import zc.monitorcache
>>> import zope.component
>>> import zc.ngi.testing
>>> import zc.monitor
>>> import zc.monitor.interfaces
>>> import zc.z3monitor
>>> import zc.z3monitor.interfaces

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> zope.component.provideUtility(zc.monitorcache.cacheMonitor,
...     zc.z3monitor.interfaces.IZ3MonitorPlugin, 'cache_size')

>>> connection.test_input('cache_size\n')
-> CLOSE

We have no databases right now. Let’s add a few so that we can test.

>>> import ZODB.tests.util
>>> import ZODB.interfaces
>>> main = ZODB.tests.util.DB()
>>> zope.component.provideUtility(main, ZODB.interfaces.IDatabase)
>>> test = ZODB.tests.util.DB()
>>> zope.component.provideUtility(
...     test, ZODB.interfaces.IDatabase, 'test')

Now we should get information on each of the database’s cache sizes

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size\n')
DB cache sizes for main
Max objects: 400
Max object size bytes: 0MB
DB cache sizes for test
Max objects: 400
Max object size bytes: 0MB
-> CLOSE

We can request information about a specific db as well

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size -\n')
DB cache sizes for main
Max objects: 400
Max object size bytes: 0MB
-> CLOSE

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size test\n')
DB cache sizes for test
Max objects: 400
Max object size bytes: 0MB
-> CLOSE

We can also modify cache sizes for a specific db

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size test 300\n')
Set max objects to 300
-> CLOSE

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size test 10MB\n')
Set max object size bytes to 10MB
-> CLOSE

>>> connection = zc.ngi.testing.TextConnection()
>>> server = zc.monitor.Server(connection)

>>> connection.test_input('cache_size test\n')
DB cache sizes for test
Max objects: 300
Max object size bytes: 10MB
-> CLOSE