diff --git a/docs/config.md b/docs/config.md index 655b56cf..a127a5ac 100644 --- a/docs/config.md +++ b/docs/config.md @@ -825,19 +825,27 @@ out [this discussion on Reddit](https://www.reddit.com/r/golang/comments/r9u4ee/ Depending on *how you run it*, here are a few limits that are relevant: -### WAL for message cache +### Message cache By default, the [message cache](#message-cache) (defined by `cache-file`) uses the SQLite default settings, which means it syncs to disk on every write. For personal servers, this is perfectly adequate. For larger installations, such as ntfy.sh, the [write-ahead log (WAL)](https://sqlite.org/wal.html) should be enabled, and the sync mode should be adjusted. See [this article](https://phiresky.github.io/blog/2020/sqlite-performance-tuning/) for details. +In addition to that, for very high load servers (such as ntfy.sh), it may be beneficial to write messages to the cache +in batches, and asynchronously. This can be enabled with the `cache-batch-size` and `cache-batch-timeout`. If you start +seeing `database locked` messages in the logs, you should probably enable that. + Here's how ntfy.sh has been tuned in the `server.yml` file: ``` yaml +cache-batch-size: 25 +cache-batch-timeout: "1s" cache-startup-queries: | pragma journal_mode = WAL; pragma synchronous = normal; pragma temp_store = memory; + pragma busy_timeout = 15000; + vacuum; ``` ### For systemd services @@ -990,6 +998,8 @@ variable before running the `ntfy` command (e.g. `export NTFY_LISTEN_HTTP=:80`). | `cache-file` | `NTFY_CACHE_FILE` | *filename* | - | If set, messages are cached in a local SQLite database instead of only in-memory. This allows for service restarts without losing messages in support of the since= parameter. See [message cache](#message-cache). | | `cache-duration` | `NTFY_CACHE_DURATION` | *duration* | 12h | Duration for which messages will be buffered before they are deleted. This is required to support the `since=...` and `poll=1` parameter. Set this to `0` to disable the cache entirely. | | `cache-startup-queries` | `NTFY_CACHE_STARTUP_QUERIES` | *string (SQL queries)* | - | SQL queries to run during database startup; this is useful for tuning and [enabling WAL mode](#wal-for-message-cache) | +| `cache-batch-size` | `NTFY_CACHE_BATCH_SIZE` | *int* | 0 | Max size of messages to batch together when writing to message cache (if zero, writes are synchronous) | +| `cache-batch-timeout` | `NTFY_CACHE_BATCH_TIMEOUT` | *duration* | 0s | Timeout for batched async writes to the message cache (if zero, writes are synchronous) | | `auth-file` | `NTFY_AUTH_FILE` | *filename* | - | Auth database file used for access control. If set, enables authentication and access control. See [access control](#access-control). | | `auth-default-access` | `NTFY_AUTH_DEFAULT_ACCESS` | `read-write`, `read-only`, `write-only`, `deny-all` | `read-write` | Default permissions if no matching entries in the auth database are found. Default is `read-write`. | | `behind-proxy` | `NTFY_BEHIND_PROXY` | *bool* | false | If set, the X-Forwarded-For header is used to determine the visitor IP address instead of the remote address of the connection. | @@ -1054,6 +1064,8 @@ OPTIONS: --behind-proxy, --behind_proxy, -P if set, use X-Forwarded-For header to determine visitor IP address (for rate limiting) (default: false) [$NTFY_BEHIND_PROXY] --cache-duration since, --cache_duration since, -b since buffer messages for this time to allow since requests (default: 12h0m0s) [$NTFY_CACHE_DURATION] --cache-file value, --cache_file value, -C value cache file used for message caching [$NTFY_CACHE_FILE] + --cache-batch-size value, --cache_batch_size value max size of messages to batch together when writing to message cache (if zero, writes are synchronous) (default: 0) [$NTFY_BATCH_SIZE] + --cache-batch-timeout value, --cache_batch_timeout value timeout for batched async writes to the message cache (if zero, writes are synchronous) (default: 0s) [$NTFY_CACHE_BATCH_TIMEOUT] --cache-startup-queries value, --cache_startup_queries value queries run when the cache database is initialized [$NTFY_CACHE_STARTUP_QUERIES] --cert-file value, --cert_file value, -E value certificate file, if listen-https is set [$NTFY_CERT_FILE] --config value, -c value config file (default: /etc/ntfy/server.yml) [$NTFY_CONFIG_FILE]