Try to increase limits on start

Cargo.lock

@@ -1282,6 +1282,7 @@ dependencies = [
  "rand",
  "regex",
  "reqwest",
+ "rlimit",
  "serde",
  "serde_json",
  "serde_urlencoded",
@@ -2013,6 +2014,15 @@ dependencies = [
  "windows-sys 0.48.0",
 ]
 
+[[package]]
+name = "rlimit"
+version = "0.10.1"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "3560f70f30a0f16d11d01ed078a07740fe6b489667abc7c7b029155d9f21c3d8"
+dependencies = [
+ "libc",
+]
+
 [[package]]
 name = "rqbit"
 version = "5.3.0"

crates/librqbit/Cargo.toml

@@ -67,6 +67,7 @@ base64 = "0.21.5"
 serde_with = "3.4.0"
 tokio-util = "0.7.10"
 bytes = "1.5.0"
+rlimit = "0.10.1"
 
 [dev-dependencies]
 futures = {version = "0.3"}

crates/librqbit/src/lib.rs

@@ -59,3 +59,7 @@ pub use librqbit_core::torrent_metainfo::*;
 pub fn version() -> &'static str {
     env!("CARGO_PKG_VERSION")
 }
+
+pub fn try_increase_nofile_limit() -> anyhow::Result<u64> {
+    Ok(rlimit::increase_nofile_limit(1024 * 1024)?)
+}

crates/rqbit/src/main.rs

@@ -246,6 +246,11 @@ async fn async_main(opts: Opts) -> anyhow::Result<()> {
         log_file_rust_log: Some(&opts.log_file_rust_log),
     })?;
 
+    match librqbit::try_increase_nofile_limit() {
+        Ok(limit) => info!(limit = limit, "inreased open file limit"),
+        Err(e) => warn!("failed increasing open file limit: {:#}", e),
+    };
+
     let mut sopts = SessionOptions {
         disable_dht: opts.disable_dht,
         disable_dht_persistence: opts.disable_dht_persistence,

desktop/src-tauri/src/main.rs

@@ -24,7 +24,7 @@ use librqbit::{
 };
 use parking_lot::RwLock;
 use serde::Serialize;
-use tracing::{error, error_span};
+use tracing::{error, error_span, info, warn};
 
 const ERR_NOT_CONFIGURED: ApiError =
     ApiError::new_from_text(StatusCode::FAILED_DEPENDENCY, "not configured");
@@ -307,6 +307,11 @@ async fn start() {
     })
     .unwrap();
 
+    match librqbit::try_increase_nofile_limit() {
+        Ok(limit) => info!(limit = limit, "inreased open file limit"),
+        Err(e) => warn!("failed increasing open file limit: {:#}", e),
+    };
+
     let state = State::new(init_logging_result).await;
 
     tauri::Builder::default()