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

Cargo.lock

@@ -68,6 +68,12 @@ dependencies = [
  "regex-automata",
 ]
 
+[[package]]
+name = "cc"
+version = "1.0.73"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "2fff2a6927b3bb87f9595d67196a70493f627687a71d87a0d692242c33f58c11"
+
 [[package]]
 name = "cfg-if"
 version = "1.0.0"
@@ -118,6 +124,12 @@ dependencies = [
  "toml",
 ]
 
+[[package]]
+name = "core-foundation-sys"
+version = "0.8.3"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "5827cebf4670468b8772dd191856768aedcb1b0278a04f989f7766351917b9dc"
+
 [[package]]
 name = "crossbeam-channel"
 version = "0.5.6"
@@ -197,7 +209,7 @@ checksum = "fea41bba32d969b513997752735605054bc0dfa92b4c56bf1189f2e174be7a10"
 
 [[package]]
 name = "du-dust"
-version = "0.8.2"
+version = "0.8.3"
 dependencies = [
  "ansi_term",
  "assert_cmd",
@@ -210,6 +222,7 @@ dependencies = [
  "regex",
  "serde",
  "stfu8",
+ "sysinfo",
  "tempfile",
  "terminal_size",
  "thousands",
@@ -322,6 +335,15 @@ dependencies = [
  "autocfg",
 ]
 
+[[package]]
+name = "ntapi"
+version = "0.3.7"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "c28774a7fd2fbb4f0babd8237ce554b73af68021b5f695a3cebd6c59bac0980f"
+dependencies = [
+ "winapi",
+]
+
 [[package]]
 name = "num_cpus"
 version = "1.13.1"
@@ -518,6 +540,23 @@ dependencies = [
  "unicode-ident",
 ]
 
+[[package]]
+name = "sysinfo"
+version = "0.15.9"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "de94457a09609f33fec5e7fceaf907488967c6c7c75d64da6a7ce6ffdb8b5abd"
+dependencies = [
+ "cc",
+ "cfg-if",
+ "core-foundation-sys",
+ "doc-comment",
+ "libc",
+ "ntapi",
+ "once_cell",
+ "rayon",
+ "winapi",
+]
+
 [[package]]
 name = "tempfile"
 version = "3.3.0"

Cargo.toml

@@ -1,7 +1,7 @@
 [package]
 name = "du-dust"
 description = "A more intuitive version of du"
-version = "0.8.2"
+version = "0.8.3"
 authors = ["bootandy <bootandy@gmail.com>", "nebkor <code@ardent.nebcorp.com>"]
 edition = "2021"
 readme = "README.md"
@@ -39,6 +39,7 @@ regex = "1"
 config-file = "0.2"
 serde = { version = "1.0", features = ["derive"] }
 directories = "4"
+sysinfo = "0.15"
 
 [target.'cfg(windows)'.dependencies]
 winapi-util = "0.1"

src/main.rs

@@ -12,6 +12,7 @@ mod utils;
 use crate::cli::build_cli;
 use std::collections::HashSet;
 use std::process;
+use sysinfo::{System, SystemExt};
 
 use self::display::draw_it;
 use clap::Values;
@@ -19,6 +20,7 @@ use config::get_config;
 use dir_walker::{walk_it, WalkData};
 use filter::get_biggest;
 use filter_type::get_all_file_types;
+use rayon::ThreadPoolBuildError;
 use regex::Regex;
 use std::cmp::max;
 use std::path::PathBuf;
@@ -154,11 +156,7 @@ fn main() {
         by_filecount,
         ignore_hidden: config.get_ignore_hidden(&options),
     };
-    // Larger stack size to handle cases with lots of nested directories
+    let _rayon = init_rayon();
-    rayon::ThreadPoolBuilder::new()
-        .stack_size(usize::pow(1024, 3))
-        .build_global()
-        .unwrap();
 
     let iso = config.get_iso(&options);
     let (top_level_nodes, has_errors) = walk_it(simplified_dirs, walk_data);
@@ -191,3 +189,19 @@ fn main() {
         )
     }
 }
+
+fn init_rayon() -> Result<(), ThreadPoolBuildError> {
+    let large_stack = usize::pow(1024, 3);
+    // Warning: Creating System is slow, takes ~ 100ms
+    let s = System::new();
+    let available = s.get_available_memory() * 1024;
+
+    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(())
+    }
+}