ZEO 5.0.0b0 released

ZEO 5.0.0b0 has been released.  This is a major revision of ZEO built on
the Python asyncio library rather than the ancient asyncore library.

Changes in this release as well as earlier ZEO 5 releases can be found here:

https://pypi.python.org/pypi/ZEO#b0-2016-08-18

I performed some performance tests:

https://docs.google.com/spreadsheets/d/1bTxtO9J7fcrGeZLaam38ncIEgWcXu
8Gpb-R8MfBhuYc/edit?usp=sharing

Here's my high-level summary of the results.

On Python 2.7, ZEO 5 is generally faster writing and slower reading than
ZEO 4.  When ZEO 5 prefetch is used, then it may be faster reading than ZEO
4.

On Python 3.5 using uvloop, ZEO 5 is faster that ZEO 4, sometimes much
faster, especially with more clients.

Using SSL slows down transactions by roughly 20% (it varies).

Using server sync slows down transactions a bit more. The transactions in
the tests were pretty small.  The impact of server sync would be less for
larger transactions.  With server sync, the client makes a do-nothing
request to the server at the start of a transaction to make sure it's seen
any invalidations that were in-flight when the transaction was initiated.
This is useful, for example, when you make a change using one client and
perform a transaction in a different client that depends on the change.
Server sync is somewhat similar to the polling done by Relstorage at the
start of a transaction.

ZEO 5.0 clients will work with ZEO 4.2 and later servers.  ZEO 5 servers
work with ZEO 5 clients.

Jim

-- 
Jim Fulton
http://jimfulton.info

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