The time for SLED to open the database is unstable.

[uuhan]

The phenomenon observed on the server in a production service:

sample code likes:

let now = std::time::Instant::now();
let db = sled::Config::new()
   .path("./storage.db")
   .cache_capacity(16 * 1024 * 1024)
   .use_compression(true)
   .open()?;
println!("elapsed={}", now.elapsed().as_secs_f32());

Recently, this time has increased unusually, but the size of the database has not changed much:

2025-07-17T23:32:58.010810Z elapsed=13.472283609s
2025-07-18T00:31:03.073596Z elapsed=13.150252891s
2025-07-18T12:31:04.696735Z elapsed=14.755547727s
2025-07-20T23:31:53.854639Z elapsed=13.819491925s
2025-07-21T00:31:03.706423Z elapsed=13.752676247s
2025-07-21T12:31:19.391920Z elapsed=29.445001172s
2025-07-21T23:32:20.055279Z elapsed=44.517126211s
2025-07-22T00:31:31.889764Z elapsed=41.946305046s
2025-07-22T12:31:52.674744Z elapsed=62.728473777s
2025-07-22T23:33:40.422165Z elapsed=75.634247358s
2025-07-23T00:32:04.365899Z elapsed=74.431517059s
2025-07-23T12:32:31.898247Z elapsed=101.967701055s
2025-07-23T23:33:08.859329Z elapsed=114.070511298s
2025-07-24T00:32:44.411158Z elapsed=114.493044037s
2025-07-24T12:34:46.989691Z elapsed=237.088078772s
2025-07-25T00:33:34.003131Z elapsed=164.05172684s
2025-07-25T12:34:07.044842Z elapsed=197.080333689s
2025-07-28T00:32:28.076355Z elapsed=134.037426401s
2025-07-28T14:35:49.755988Z elapsed=7535.357810537s
2025-07-28T23:38:22.012366Z elapsed=261.49002902s
2025-07-29T00:34:33.777072Z elapsed=259.388673781s
2025-07-29T12:35:21.829718Z elapsed=307.395638257s
2025-07-29T23:34:56.492743Z elapsed=328.469383901s
2025-07-30T00:35:38.536849Z elapsed=324.142181597s
2025-07-30T12:36:31.171183Z elapsed=376.758787583s
2025-07-30T23:37:08.702157Z elapsed=397.178602595s
2025-07-31T00:36:52.972404Z elapsed=398.581099713s
2025-07-31T12:37:49.472034Z elapsed=455.060896567s
2025-07-31T23:42:02.100265Z elapsed=556.576408736s
2025-08-01T00:38:08.159251Z elapsed=473.762119737s
2025-08-01T12:39:06.424923Z elapsed=531.997469132s
2025-08-04T00:41:08.758576Z elapsed=654.358384829s
2025-08-04T12:42:06.699699Z elapsed=712.274436445s
2025-08-04T23:44:43.955825Z elapsed=652.928123053s
2025-08-05T00:41:06.616980Z elapsed=652.18547025s
2025-08-05T12:42:12.842694Z elapsed=718.393923134s
2025-08-06T00:42:47.772554Z elapsed=753.321329743s
2025-08-06T12:43:59.024460Z elapsed=824.572329428s
2025-08-06T23:45:43.976588Z elapsed=864.703123776s
2025-08-07T00:44:42.957125Z elapsed=868.516326905s
2025-08-07T12:45:51.028193Z elapsed=936.503370317s
2025-08-07T23:48:20.610289Z elapsed=1090.086356179s
2025-08-08T00:46:51.576136Z elapsed=997.099327802s
2025-08-08T12:48:11.939840Z elapsed=1077.483584712s
2025-08-11T00:00:21.260889Z elapsed=1118.963474407s
2025-08-11T00:48:45.194438Z elapsed=1110.760534196s
2025-08-11T12:02:32.356440Z elapsed=1210.30146322s
2025-08-11T12:22:59.687279Z elapsed=1210.162728276s
2025-08-11T12:50:15.219787Z elapsed=1200.781613488s
2025-08-11T23:56:35.229178Z elapsed=1251.455442896s
2025-08-12T00:51:01.020527Z elapsed=1246.575805027s
2025-08-12T12:52:39.198688Z elapsed=1344.713850158s
2025-08-13T00:55:27.514278Z elapsed=1513.121583575s
2025-08-13T12:07:19.209526Z elapsed=1527.899563823s
2025-08-13T12:55:25.859336Z elapsed=1511.414951124s
2025-08-14T00:55:22.649731Z elapsed=1508.20038979s
2025-08-14T12:59:26.377996Z elapsed=1751.973299227s
2025-08-14T13:26:46.769002Z elapsed=1619.7459927s
2025-08-14T13:54:04.283436Z elapsed=1616.260301335s
2025-08-15T00:57:29.190210Z elapsed=1634.731761182s
2025-08-15T13:01:22.988764Z elapsed=1868.555842684s
2025-08-18T01:00:28.549301Z elapsed=1814.027124723s
2025-08-18T13:02:39.124988Z elapsed=1944.638793668s
2025-08-18T13:35:02.996549Z elapsed=1935.474028451s
2025-08-18T14:07:30.429207Z elapsed=1933.40651204s
2025-08-19T00:03:32.285877Z elapsed=1989.254480549s
2025-08-19T01:03:23.102007Z elapsed=1988.615617428s
2025-08-19T13:07:19.749479Z elapsed=2225.336054689s
2025-08-20T00:07:44.830691Z elapsed=2117.306350225s
2025-08-20T01:05:24.463811Z elapsed=2109.990992419s
2025-08-20T12:18:24.726179Z elapsed=2353.419034798s
2025-08-20T13:07:14.670750Z elapsed=2234.090418988s
2025-08-21T00:09:23.198658Z elapsed=2415.157296778s
2025-08-21T01:09:12.815706Z elapsed=2338.303110452s
2025-08-21T13:11:21.573998Z elapsed=2467.082727553s
2025-08-22T01:12:37.862362Z elapsed=2543.368887877s
2025-08-22T13:15:03.022059Z elapsed=2688.526935915s
2025-08-22T13:59:39.787783Z elapsed=2670.264004958s
2025-08-25T00:19:44.846743Z elapsed=2721.323053705s
2025-08-25T01:15:48.479022Z elapsed=2733.988783935s
2025-08-25T13:18:35.934296Z elapsed=2901.421797767s
2025-08-26T00:22:55.495496Z elapsed=2986.191769211s
2025-08-26T01:19:46.582487Z elapsed=2972.092131432s
2025-08-26T13:22:12.390615Z elapsed=3117.873482156s
2025-08-26T14:13:59.245595Z elapsed=3100.468814347s
2025-08-27T00:23:16.830631Z elapsed=3164.806755402s
2025-08-27T01:22:58.767117Z elapsed=3164.28216022s
2025-08-27T13:27:42.710304Z elapsed=3448.299382341s
2025-08-27T14:24:09.069909Z elapsed=3371.797187597s
2025-08-28T00:29:35.303272Z elapsed=3363.270571341s
2025-08-28T01:26:08.647082Z elapsed=3354.162655194s
2025-08-28T13:28:43.325396Z elapsed=3508.791477085s
2025-08-28T14:27:24.885412Z elapsed=3509.111734957s
2025-08-29T01:29:33.293692Z elapsed=3558.754348777s
2025-08-29T13:32:08.445917Z elapsed=3713.907220381s
2025-08-29T14:34:02.445654Z elapsed=3698.667840169s
2025-09-01T01:31:38.146983Z elapsed=3697.470428458s
2025-09-01T13:35:05.120275Z elapsed=3890.556488843s
2025-09-01T14:40:03.419057Z elapsed=3891.888924426s
2025-09-02T01:35:25.873681Z elapsed=3925.235033363s
2025-09-02T13:38:49.561137Z elapsed=4115.019732234s
2025-09-02T14:47:31.178437Z elapsed=4099.626849373s
2025-09-03T01:38:54.256748Z elapsed=4119.74652137s
2025-09-03T13:42:15.965166Z elapsed=4321.472463679s
2025-09-04T01:43:03.902771Z elapsed=4383.174509745s
2025-09-04T13:46:27.619513Z elapsed=4573.043362275s
2025-09-05T01:47:41.860823Z elapsed=4661.172873209s
2025-09-05T13:50:46.953813Z elapsed=4832.373594115s
2025-09-05T15:11:16.339867Z elapsed=4809.318963783s
2025-09-08T01:51:18.798205Z elapsed=4878.106076577s
2025-09-08T13:54:44.727129Z elapsed=5070.126162314s
2025-09-09T01:54:24.998935Z elapsed=5050.428089342s

Environments:

sled version: 0.34.7
db size： **6.7G**
os: archlinux
filesystem: zfs

[eval-exec]

@uuhan Hello, could you provide the db file, so we can reproduce it locally?

[uuhan]

@uuhan Hello, could you provide the db file, so we can reproduce it locally?

It's not quiet easy to share the db content. A bit sensitive.

But it's quiet strange, I write a small program just to open the db file, the open time is just around 10s. Can not reproduce this every time.