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Kirill Smelkov
ZEO
Commits
0bb2eb3e
Commit
0bb2eb3e
authored
Sep 10, 2002
by
Guido van Rossum
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A few edits suggested by Barry.
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src/ZEO/README.txt
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0bb2eb3e
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@@ -6,16 +6,17 @@ What's ZEO?
===========
ZEO stands for Zope Enterprise Objects. ZEO is an add-on for Zope
that allows a
ZODB storage to live on a separate machine, which is
accessed via a network by multiple Zope instances. ZEO 2 has many
improvements over ZEO 1, and is incompatible with ZEO 1; if you
upgrade an existing ZEO 1 installation, you must upgrade the server
and all clients simultaneous. If you received ZEO 2 as part of the
ZODB 3 distribution, the ZEO 1 sources are provided in a separate
that allows a
multiple processes to connect to a single ZODB storage.
Those processes can live on different machines, but don't need to.
ZEO 2 has many improvements over ZEO 1, and is incompatible with ZEO
1; if you upgrade an existing ZEO 1 installation, you must upgrade the
server and all clients simultaneous. If you received ZEO 2 as part of
the
ZODB 3 distribution, the ZEO 1 sources are provided in a separate
directory (ZEO1). Some documentation for ZEO is available in the ZODB
3 package in the Doc subdirectory. ZEO depends on the ZODB software;
it can be used with the version of ZODB distributed with Zope 2.5.1 or
later. More information about ZEO can be found on its home on the web:
later. More information about ZEO can be found on its home on the
web:
http://www.zope.org/Products/ZEO/
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@@ -45,8 +46,8 @@ zrpc/ subpackage implementing Remote Procedure Call (RPC)
Client Cache Tracing
====================
An important question for ZEO users is
,
how large should the ZEO
client cache be
.
ZEO 2 (as of ZEO 2.0b2) has a new feature that lets
An important question for ZEO users is
:
how large should the ZEO
client cache be
?
ZEO 2 (as of ZEO 2.0b2) has a new feature that lets
you collect a trace of cache activity and tools to analyze this trace,
enabling you to make an informed decision about the cache size.
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@@ -64,8 +65,8 @@ problems with the file, a log message is written to the standard Zope
log file. To start or stop tracing, the ZEO client process (typically
a Zope application server) must be restarted.
The trace file can grow pretty
fast; on a moderately loaded server, we
observed it growing by 5 MB per hour. The file consists of binary
The trace file can grow pretty
quickly; on a moderately loaded server,
we
observed it growing by 5 MB per hour. The file consists of binary
records, each 24 bytes long; a detailed description of the record
lay-out is given in stats.py. No sensitive data is logged.
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