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这篇文章主要讲解了“相似图像搜索插件 imgsmlr 性能测试与优化方法是什么”,文中的讲解内容简单清晰,易于学习与理解,下面请大家跟着丸趣 TV 小编的思路慢慢深入,一起来研究和学习“相似图像搜索插件 imgsmlr 性能测试与优化方法是什么”吧!
citus (8 节点, 128 shard)
1、安装 imgsmlr 插件软件 (所有节点)
2、create extension imgsmlr (所有节点)
3、生成随机 img sig 的函数 (cn, 因为只需要用于插入, 不需要下推)
CREATE OR REPLACE FUNCTION public.gen_rand_img_sig(integer)
RETURNS signature
LANGUAGE sql
STRICT
AS $function$
select (( ||rtrim(ltrim(array(select (random()*$1)::float4 from generate_series(1,16))::text, {),} )|| ) )::signature;
$function$;
4、创建测试表 (cn)
create table t_img (id int primary key, sig signature);
5、创建索引 (cn)
create index idx_t_img_1 on t_img using gist (sig);
6、创建分片表 (128 shard) (cn)
set citus.shard_count = 128;
select create_distributed_table(t_img , id
7、写入 4.5 亿随机图像特征值
vi test.sql
\set id random(1,2000000000)
insert into t_img values (:id, gen_rand_img_sig(10)) on conflict(id) do nothing;
pgbench -M prepared -n -r -P 1 -f ./test.sql -c 128 -j 128 -t 10000000
写入约 4.5 亿随机图像特征值
postgres=# select count(*) from t_img;
count
-----------
446953185
(1 row)
postgres=# select * from t_img limit 10;
id | sig
-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------
47902935 | (5.861920, 1.062770, 8.318020, 2.205840, 0.202951, 6.956610, 1.413190, 2.898480, 8.961630, 6.377800, 1.110450, 6.684520, 2.286290, 7.850760, 1.832650, 0.074348)
174656795 | (2.165030, 0.183753, 9.913950, 9.208260, 5.165660, 6.603510, 2.008380, 8.117910, 2.358590, 5.466330, 9.139280, 8.893700, 4.664190, 9.361670, 9.016990, 2.271000)
96186891 | (9.605980, 4.395920, 4.336720, 3.174360, 8.706960, 0.155107, 9.408940, 4.531100, 2.783530, 5.681780, 9.792380, 6.428320, 2.983760, 9.733290, 7.635160, 7.035780)
55061667 | (7.567960, 5.874530, 5.222040, 5.638520, 3.488960, 8.770750, 7.054610, 7.239630, 9.202280, 9.465020, 4.079080, 5.729770, 0.475227, 8.434800, 6.873730, 5.140080)
64659434 | (4.860650, 3.984440, 3.009900, 5.116680, 6.489150, 4.224800, 0.609752, 8.731120, 6.577390, 8.542540, 9.096120, 8.976700, 8.936000, 2.836270, 7.186250, 6.264300)
87143098 | (4.801570, 7.870150, 0.939599, 3.666670, 1.102340, 5.819580, 6.511330, 6.430760, 0.584531, 3.024190, 6.255460, 8.823820, 5.076960, 0.181344, 8.137380, 1.230360)
109245945 | (7.541850, 7.201460, 6.858400, 2.605210, 1.283090, 7.525200, 4.213240, 8.413760, 9.707390, 1.916970, 1.719320, 1.255280, 9.006780, 4.851420, 2.168250, 5.997360)
4979218 | (8.463000, 4.051410, 9.057320, 1.367980, 3.344340, 7.032640, 8.583770, 1.873090, 5.524810, 0.187254, 5.783270, 6.141040, 2.479410, 6.406450, 9.371700, 0.050690)
72846137 | (7.018560, 4.039150, 9.114800, 2.911170, 5.531180, 8.557330, 6.739050, 0.103649, 3.691390, 7.584640, 8.184180, 0.599390, 9.037130, 4.090610, 4.369770, 6.480000)
36813995 | (4.643480, 8.704640, 1.073880, 2.665530, 3.298300, 9.244280, 5.768050, 0.887555, 5.990350, 2.991390, 6.186550, 6.464940, 6.187140, 0.150242, 2.123070, 2.932270)
(10 rows)
查询性能
1、由于 imgsmlr 的一些类型没有写对应的 send, recv 函数接口,所以需要使用 TEXT 交互。CN 设置参数如下
set citus.binary_master_copy_format =off;
未设置时报错
WARNING: 42883: no binary output function available for type signature
LOCATION: ReportResultError, remote_commands.c:302
2、创建生成随机图像特征值 stable 函数,便于测试。(所有节点)
create or replace function get_rand_img_sig(int) returns signature as $$
select (( ||rtrim(ltrim(array(select (random()*$1)::float4 from generate_series(1,16))::text, {),} )|| ) )::signature;
$$ language sql strict stable;
3、性能
postgres=# select * from t_img order by sig - get_rand_img_sig(10) limit 1;
id | sig
-----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------
565459043 | (1.790420, 9.463960, 7.089370, 5.888980, 0.974693, 2.148580, 6.153310, 9.098670, 2.815750, 7.625620, 7.598990, 7.141670, 7.189410, 4.630740, 3.673030, 7.820140)
(1 row)
Time: 612.839 ms
4、执行计划
postgres=# explain (analyze,verbose,timing,costs,buffers) select * from t_img order by sig - get_rand_img_sig(10) limit 1;
QUERY PLAN
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Limit (cost=0.00..0.00 rows=0 width=0) (actual time=823.235..823.237 rows=1 loops=1)
Output: remote_scan.id, remote_scan.sig, remote_scan.worker_column_3
- Sort (cost=0.00..0.00 rows=0 width=0) (actual time=823.233..823.233 rows=1 loops=1)
Output: remote_scan.id, remote_scan.sig, remote_scan.worker_column_3
Sort Key: remote_scan.worker_column_3
Sort Method: top-N heapsort Memory: 25kB
- Custom Scan (Citus Real-Time) (cost=0.00..0.00 rows=0 width=0) (actual time=823.185..823.200 rows=128 loops=1)
Output: remote_scan.id, remote_scan.sig, remote_scan.worker_column_3
Task Count: 128
Tasks Shown: One of 128
- Task
Node: host=172.24.211.224 port=1921 dbname=postgres
- Limit (cost=0.67..0.97 rows=1 width=72) (actual time=151.011..151.012 rows=1 loops=1)
Output: id, sig, ((sig - get_rand_img_sig(10)))
Buffers: shared hit=5769
- Index Scan using idx_t_img_1_106940 on public.t_img_106940 t_img (cost=0.67..1052191.36 rows=3488100 width=72) (actual time=151.008..151.009 rows=1 loops=1)
Output: id, sig, (sig - get_rand_img_sig(10))
Order By: (t_img.sig - get_rand_img_sig(10))
Buffers: shared hit=5769
Planning time: 1.021 ms
Execution time: 156.785 ms
Planning time: 2.364 ms
Execution time: 823.577 ms
(23 rows)
postgres=# select * from t_img order by sig - get_rand_img_sig(10) limit 1;
id | sig
----------+------------------------------------------------------------------------------------------------------------------------------------------------------------------
30290963 | (4.656000, 7.143380, 7.738080, 1.971150, 4.294430, 4.397560, 7.121350, 8.629690, 2.768710, 2.715320, 0.358493, 0.486682, 5.985860, 8.319860, 2.560290, 3.384480)
(1 row)
Time: 612.783 ms
postgres=# select * from t_img order by sig - get_rand_img_sig(10) limit 1;
id | sig
------------+------------------------------------------------------------------------------------------------------------------------------------------------------------------
1632633492 | (6.969460, 5.835990, 0.629481, 7.621580, 0.171138, 2.586950, 1.483150, 5.526530, 3.835270, 2.275350, 3.470760, 4.934100, 0.442193, 1.843810, 0.561291, 0.647721)
(1 row)
Time: 610.960 ms
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