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name: performance-test/README 	 # note: path name is non-authoritative(*)

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Pre-requisites
--------------

In addition to having notmuch, you need:

- gpg
- gnu tar
- gnu time
- xz. Some speedup can be gotten by installing "pixz", but this is
  probably only worthwhile if you are debugging the tests.

Getting set up to run tests:
----------------------------

First, you need to get the corpus.  If you don't already have the gpg
key for David Bremner, run

   % gpg --search 'david@tethera.net'

This should get you a key with fingerprint

    815B 6398 2A79 F8E7 C727  86C4 762B 57BB 7842 06AD

(the last 8 digits are printed as the "key id").

To fetch the actual corpus it should work to run

   % make download-corpus

In case that fails or is too slow, check

   http://notmuchmail.org/corpus

for a list of mirrors.

Running tests
-------------

The easiest way to run performance tests is to say "make perf-test", (or
simply run the notmuch-perf-test script). Either command will run all
available performance tests.

Alternately, you can run a specific subset of tests by simply invoking
one of the executable scripts in this directory, (such as ./basic).
Each test script supports the following arguments

--small / --medium / --large	Choose corpus size.
--debug				Enable debugging. In particular don't delete
				temporary directories.

Writing tests
-------------

Have a look at "01-dump-restore" for an example. Sourcing
"perf-test-lib.sh" is mandatory.  Utility functions include

- 'add_email_corpus' unpacks a set of messages and adds them to the database.
- 'cache_database': makes a snapshot of the current database
- 'uncache_database': forces the next 'add_email_corpus' to rebuild the
  database.
- 'time_done' does the cleanup; comment it out or pass --debug to the
  script to leave the temporary files around.

Scripts are run in the order specified in notmuch-perf-test. In the
future this order might be chosen automatically so please follow the
convention of starting the name with two digits to specify the order.

debug log:

solving 35489a9 ...
found 35489a9 in https://yhetil.org/notmuch/1354762908-5788-11-git-send-email-david@tethera.net/
found fd5c977 in https://yhetil.org/notmuch/1354762908-5788-8-git-send-email-david@tethera.net/
found 36f1dac in https://yhetil.org/notmuch.git/
preparing index
index prepared:
100644 36f1dacd3cbff9e35c78801fe8712e37fe3e72a2	performance-test/README

applying [1/2] https://yhetil.org/notmuch/1354762908-5788-8-git-send-email-david@tethera.net/
diff --git a/performance-test/README b/performance-test/README
index 36f1dac..fd5c977 100644


applying [2/2] https://yhetil.org/notmuch/1354762908-5788-11-git-send-email-david@tethera.net/
diff --git a/performance-test/README b/performance-test/README
index fd5c977..35489a9 100644

Checking patch performance-test/README...
Applied patch performance-test/README cleanly.
Checking patch performance-test/README...
Applied patch performance-test/README cleanly.

index at:
100644 35489a950cc3e194f264e064ffe171360079049a	performance-test/README

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