Fix: Only create large stack size if enough memory

Small boxes do not have enough memory to create a large stack

Conversely we want a large stack size for large boxes with a very highly
nested directory structure.

Version: New version

src/main.rs

@@ -11,7 +11,6 @@ mod utils;
 
 use crate::cli::build_cli;
 use std::collections::HashSet;
-use std::panic;
 use std::process;
 use sysinfo::{System, SystemExt};
 
@@ -157,10 +156,7 @@ fn main() {
         by_filecount,
         ignore_hidden: config.get_ignore_hidden(&options),
     };
-    let pool = panic::catch_unwind(init_rayon);
+    let _rayon = init_rayon();
-    if pool.is_err() {
-        eprintln!("Warning: Could not configure threads {:?}", pool.err());
-    }
 
     let iso = config.get_iso(&options);
     let (top_level_nodes, has_errors) = walk_it(simplified_dirs, walk_data);
@@ -195,14 +191,17 @@ fn main() {
 }
 
 fn init_rayon() -> Result<(), ThreadPoolBuildError> {
-    let s = System::new_all();
+    let large_stack = usize::pow(1024, 3);
-    let av = s.get_available_memory();
+    // Warning: Creating System is slow, takes ~ 100ms
-    let free = s.get_free_memory();
+    let s = System::new();
-    println!("{}", av);
+    let available = s.get_available_memory() * 1024;
-    println!("{}", free);
-    // Larger stack size to handle cases with lots of nested directories
-    rayon::ThreadPoolBuilder::new()
-        .stack_size(usize::pow(1024, 3))
-        .build_global()
 
+    if available > large_stack.try_into().unwrap() {
+        // Larger stack size to handle cases with lots of nested directories
+        rayon::ThreadPoolBuilder::new()
+            .stack_size(large_stack)
+            .build_global()
+    } else {
+        Ok(())
+    }
 }