Debug Information - Debugging Information: Online Zope debugging

Description

This view provides simple debugging information to help product authors find memory leaks in their products as well as Zope itself.

Debugging Information

• The Zope version
• The Python version
• The system platform name
• The filesystem path of the Zope core software, add-on software, and data files.
• The ID number of the Zope process (if available on your platform)
• The length of time Zope has been running
• The Python module search paths (sys.path).
• The top refcounts, including a table listing the changes since * the last snapshot
• The open object database connections

The Zope version, Python version, and system platform name are used to verify compatibility between Zope, Python, and your system. On platforms where the process ID number is available, the Zope process can be managed using a more forceful means than is available through the web.

Refcounts

The top refcounts list lets you take a look at what is being stored by Zope in memory. The scrollable list shows how many instances of each type of object are currently in memory.

If there are items in the list with a very high refcount, there is a good chance there is a memory leak in a product or in Zope. Using the snapshot and refresh options allow you to determine which operations are causing memory leaks.

Open Connections

A database connection usually corresponds with an HTTP request. The left column shows the time at which the connection was opened. If there is a request that has been running for a long time you may need to restart Zope to kill the corresponding thread. The middle column usually shows the state of the REQUEST object with size of the cache for that connection in parentheses. The right column shows information about the version the user is working in.

Controls

Update Snapshot

Takes the current refcounts and store them in memory. Then each time the debugging page is reloaded, the table will show the difference in refcounts between the snapshot and the current state.

Refresh

Reloads and updates the debugging information.

Auto refresh interval

The number of seconds to wait before automatically refreshing the debugging information.

Start auto refresh

Begins automatically refreshing the debugging information.

Stop auto refresh

Ends automatic refreshing of the debugging information.