[GitHub] [couchdb] nickva commented on a diff in pull request #4601: Add a simple fabric benchmark

["nickva (via GitHub)" <gi...@apache.org>]

nickva commented on code in PR #4601:
URL: https://github.com/apache/couchdb/pull/4601#discussion_r1193036140


##########
src/fabric/src/fabric_bench.erl:
##########
@@ -0,0 +1,371 @@
+% Licensed under the Apache License, Version 2.0 (the "License"); you may not
+% use this file except in compliance with the License. You may obtain a copy of
+% the License at
+%
+%   http://www.apache.org/licenses/LICENSE-2.0
+%
+% Unless required by applicable law or agreed to in writing, software
+% distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+% WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+% License for the specific language governing permissions and limitations under
+% the License.
+
+-module(fabric_bench).
+
+-export([
+    opts/0,
+    go/0,
+    go/1,
+    doc/2,
+    body/1,
+    delete_old_dbs/0
+]).
+
+-define(VERSION, "1").
+-define(PREFIX, "fabricbenchdb-").
+-define(MAX_DB_AGE_USEC, (60 * 60 * 8 * 1000000)).
+
+opts() ->
+    #{
+        q => default,
+        n => default,
+        % Doc size type: small, medium or large
+        doc_size => medium,
+        % How many total docs to insert using _bulk_docs. These are the
+        % docs used for reads and streaming bechmarks
+        docs => 100000,
+        % Batch size used for _bulk_docs insertion
+        batch_size => 1000,
+        % How many individual doc updates to do
+        individual_docs => 1000
+    }.
+
+go() ->
+    go(#{}).
+
+go(#{} = Opts) ->
+    #{q := Q, n := N} = maps:merge(opts(), Opts),
+    QN = [{q, Q}, {n, N}],
+    DbOpts = [{K, V} || {K, V} <- QN, V =/= default],
+    ok = delete_old_dbs(),
+    Db = db_name(),
+    ok = fabric:create_db(Db, DbOpts),
+    Shards = disable_compaction(Db),
+    try
+        go(Db, Opts)
+    after
+        ok = fabric:delete_db(Db),
+        clear_compaction_settings(Shards)
+    end.
+
+go(Db, #{} = Opts0) when is_binary(Db) ->
+    Opts = maps:merge(opts(), Opts0),
+    #{
+        doc_size := DocSize,
+        docs := BulkDocs,
+        batch_size := BatchSize,
+        individual_docs := IndividualDocs
+    } = Opts,
+
+    log_opts(Opts),
+    log_environment_info(Db),
+
+    io:format("~n *** Inserting ~B docs~n", [BulkDocs]),
+    {T1, {Ok, Accepted}} = run(fun() -> bulk_docs(Db, DocSize, BatchSize, BulkDocs, {0, 0}) end),
+    log("Add ~p docs, ok:~p/accepted:~p", [BulkDocs, Ok, Accepted], T1, BulkDocs),
+
+    % Avoid a lagging internal replicator skewing test results, so wait
+    % for the backlog to clear.
+    wait_for_internal_replicator(),
+
+    {ok, N} = fabric:get_doc_count(Db),
+    case N =/= BulkDocs of
+        true -> throw({unexpected_doc_count, N, BulkDocs});
+        false -> ok
+    end,
+
+    {T2, _} = run(fun() ->
+        rand:seed(default, 0),
+        get_docs(Db, N, N)
+    end),
+    log("Get random doc ~pX", [N], T2, N),
+
+    {T3, N} = run(fun() -> get_all_docs(Db, []) end),
+    log("All docs", [], T3, N),
+
+    {T4, N} = run(fun() -> get_all_docs(Db, [{include_docs, true}]) end),
+    log("All docs w/ include_docs", [], T4, N),
+
+    {T5, N} = run(fun() -> get_changes(Db, []) end),

Review Comment:
   There are there to check that we have actually processed the expected N docs/rows. I noticed emacs's erlang-ls complained but wasn't sure it made sense to make the matches more verbose.



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