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Explain max_prepared_transactions requirement in isolation tests' README.

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Now that we have a test that requires nondefault settings to pass, it seems
like we'd better mention that detail in the directions about how to run the
tests.

Also do some very minor copy-editing.
This commit is contained in:
Tom Lane 2011-08-18 11:45:33 -04:00
parent b936d9264c
commit 6a42b29102
1 changed files with 24 additions and 6 deletions
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30
src/test/isolation/README
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@ -5,13 +5,20 @@ Isolation tests
This directory contains a set of tests for the serializable isolation level.
Testing isolation requires running multiple overlapping transactions,
which requires multiple concurrent connections, and can't therefore be
which requires multiple concurrent connections, and therefore can't be
tested using the normal pg_regress program.
To represent a test with overlapping transactions, we use a test specification
file with a custom syntax, described in the next section.
To run the tests, you need to have a server running at the default port
expected by libpq. (You can set PGPORT and so forth in your environment
to control this.) Then run
gmake installcheck
Note that the prepared-transactions test will not pass unless you have
the server's max_prepared_transactions parameter set to at least 3.
isolationtester is program that uses libpq to open multiple connections,
To represent a test with overlapping transactions, we use a test specification
file with a custom syntax, which is described in the next section.
isolationtester is a program that uses libpq to open multiple connections,
and executes a test specified by a spec file. A libpq connection string
specifies the server and database to connect to; defaults derived from
environment variables are used otherwise.
@ -19,8 +26,6 @@ environment variables are used otherwise.
pg_isolation_regress is a tool similar to pg_regress, but instead of using
psql to execute a test, it uses isolationtester.
To run the tests, you need to have a server up and running. Run
gmake installcheck
Test specification
==================
@ -63,3 +68,16 @@ permutation "<step name>" ...
all possible overlapping orderings of the given sessions.
Lines beginning with a # are considered comments.
Support for blocking commands
=============================
Each spec may contain commands that block until further action has been taken
(most likely, some other session runs a step that unblocks it or causes a
deadlock). Such a spec needs to be careful to manually specify valid
permutations, i.e. those that would not expect a blocked session to execute a
command. If the spec fails to follow that rule, the spec is aborted.
Only one command can be waiting at a time. As long as one command is waiting,
other commands are run to completion synchronously.