From e94ae5a87d5bec44654e75ead3efbc7b663da34a Mon Sep 17 00:00:00 2001
From: John Kerl <kerl.john.r@gmail.com>
Date: Sun, 1 Feb 2026 11:56:13 -0500
Subject: [PATCH] Timings misc (#1945)

---
 .../early-multi-language-timings/catrust2.rs  | 14 +++++++++++
 scripts/early-multi-language-timings/ff1.rs   | 24 +++++++++++++++++++
 scripts/early-multi-language-timings/ff2.rs   | 21 ++++++++++++++++
 scripts/early-multi-language-timings/ff3.rs   | 21 ++++++++++++++++
 scripts/early-multi-language-timings/ff4.rs   | 24 +++++++++++++++++++
 .../new-timings.sh                            |  9 +++++++
 .../new-timings.txt                           | 24 +++++++++++++++++++
 7 files changed, 137 insertions(+)
 create mode 100644 scripts/early-multi-language-timings/catrust2.rs
 create mode 100644 scripts/early-multi-language-timings/ff1.rs
 create mode 100644 scripts/early-multi-language-timings/ff2.rs
 create mode 100644 scripts/early-multi-language-timings/ff3.rs
 create mode 100644 scripts/early-multi-language-timings/ff4.rs
 create mode 100644 scripts/early-multi-language-timings/new-timings.sh
 create mode 100644 scripts/early-multi-language-timings/new-timings.txt

diff --git a/scripts/early-multi-language-timings/catrust2.rs b/scripts/early-multi-language-timings/catrust2.rs
new file mode 100644
index 000000000..bc242183d
--- /dev/null
+++ b/scripts/early-multi-language-timings/catrust2.rs
@@ -0,0 +1,14 @@
+//use std::fs::File;
+use std::io::{self, prelude::*, BufReader};
+
+fn main() -> io::Result<()> {
+    //let file = File::open("foo.txt")?;
+    let file = io::stdin();
+    let reader = BufReader::new(file);
+
+    for line in reader.lines() {
+        println!("{}", line?);
+    }
+
+    Ok(())
+}
diff --git a/scripts/early-multi-language-timings/ff1.rs b/scripts/early-multi-language-timings/ff1.rs
new file mode 100644
index 000000000..cda208f0b
--- /dev/null
+++ b/scripts/early-multi-language-timings/ff1.rs
@@ -0,0 +1,24 @@
+// Claude
+
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+
+// Method 1: Using BufReader with lines() - Good balance of speed and memory
+fn read_lines_buf_reader(path: &str) -> io::Result<()> {
+    let file = File::open(path)?;
+    let reader = BufReader::new(file);
+
+    let mut n = 0;
+    for line in reader.lines() {
+        let _line = line?;
+        // Process line here
+        n += 1;
+    }
+    println!("line count {}", n);
+
+    Ok(())
+}
+
+fn main() {
+  let _ = read_lines_buf_reader("/Users/kerl/tmp/big");
+}
diff --git a/scripts/early-multi-language-timings/ff2.rs b/scripts/early-multi-language-timings/ff2.rs
new file mode 100644
index 000000000..c83baecbc
--- /dev/null
+++ b/scripts/early-multi-language-timings/ff2.rs
@@ -0,0 +1,21 @@
+// Claude
+
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+
+// Method 2: Using BufReader with read_line - More control, similar performance
+fn read_lines_manual(path: &str) -> io::Result<()> {
+    let file = File::open(path)?;
+    let mut reader = BufReader::new(file);
+    let mut line = String::new();
+    
+    while reader.read_line(&mut line)? > 0 {
+        // Process line here
+        line.clear(); // Reuse the string buffer
+    }
+    Ok(())
+}
+
+fn main() {
+  let _ = read_lines_manual("/Users/kerl/tmp/big");
+}
diff --git a/scripts/early-multi-language-timings/ff3.rs b/scripts/early-multi-language-timings/ff3.rs
new file mode 100644
index 000000000..835df7c40
--- /dev/null
+++ b/scripts/early-multi-language-timings/ff3.rs
@@ -0,0 +1,21 @@
+// Claude
+
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+
+// Method 3: Using custom buffer size for larger files
+fn read_lines_custom_buffer(path: &str) -> io::Result<()> {
+    const BUFFER_SIZE: usize = 128 * 1024; // 128KB buffer
+    let file = File::open(path)?;
+    let reader = BufReader::with_capacity(BUFFER_SIZE, file);
+    
+    for line in reader.lines() {
+        let _line = line?;
+        // Process line here
+    }
+    Ok(())
+}
+
+fn main() {
+  let _ = read_lines_custom_buffer("/Users/kerl/tmp/big");
+}
diff --git a/scripts/early-multi-language-timings/ff4.rs b/scripts/early-multi-language-timings/ff4.rs
new file mode 100644
index 000000000..4ee3224ee
--- /dev/null
+++ b/scripts/early-multi-language-timings/ff4.rs
@@ -0,0 +1,24 @@
+// Claude
+
+use std::fs::File;
+use std::io::{self, BufRead, BufReader};
+
+// Method 4: Memory mapped files for very large files
+fn read_lines_memmap(path: &str) -> io::Result<()> {
+    use memmap2::Mmap;
+    
+    let file = File::open(path)?;
+    let mmap = unsafe { Mmap::map(&file)? };
+    
+    // Convert memory map to string and iterate over lines
+    if let Ok(contents) = std::str::from_utf8(&mmap) {
+        for line in contents.lines() {
+            // Process line here
+        }
+    }
+    Ok(())
+}
+
+fn main() {
+  let _ = read_lines_custom_buffer("/Users/kerl/tmp/big");
+}
diff --git a/scripts/early-multi-language-timings/new-timings.sh b/scripts/early-multi-language-timings/new-timings.sh
new file mode 100644
index 000000000..ec9345a07
--- /dev/null
+++ b/scripts/early-multi-language-timings/new-timings.sh
@@ -0,0 +1,9 @@
+justtime ./catc < ~/tmp/big > /dev/null
+justtime ./catc0 < ~/tmp/big > /dev/null
+justtime ./catm < ~/tmp/big > /dev/null
+justtime ./catrust < ~/tmp/big > /dev/null
+justtime ./catrust2 < ~/tmp/big > /dev/null
+justtime ./ff1 < ~/tmp/big > /dev/null
+justtime ./ff2 < ~/tmp/big > /dev/null
+justtime ./ff3 < ~/tmp/big > /dev/null
+justtime ./catgo < ~/tmp/big > /dev/null
diff --git a/scripts/early-multi-language-timings/new-timings.txt b/scripts/early-multi-language-timings/new-timings.txt
new file mode 100644
index 000000000..bd095e95e
--- /dev/null
+++ b/scripts/early-multi-language-timings/new-timings.txt
@@ -0,0 +1,24 @@
+
+bash ./new-timings.sh
+TIME IN SECONDS 9.691 -- ./catc
+TIME IN SECONDS 8.137 -- ./catc0
+TIME IN SECONDS 0.005 -- ./catm
+TIME IN SECONDS 12.975 -- ./catrust
+TIME IN SECONDS 52.282 -- ./catrust2
+TIME IN SECONDS 7.488 -- ./ff1
+TIME IN SECONDS 4.646 -- ./ff2
+TIME IN SECONDS 6.932 -- ./ff3
+TIME IN SECONDS 6.412 -- ./catgo
+
+TIME IN SECONDS 0.005 -- ./catm
+TIME IN SECONDS 4.646 -- ./ff2
+TIME IN SECONDS 6.412 -- ./catgo
+TIME IN SECONDS 6.932 -- ./ff3
+TIME IN SECONDS 7.488 -- ./ff1
+TIME IN SECONDS 8.137 -- ./catc0
+TIME IN SECONDS 9.691 -- ./catc
+TIME IN SECONDS 12.975 -- ./catrust
+TIME IN SECONDS 52.282 -- ./catrust2
+
+$ justtime mlr cat ~/tmp/big > /dev/null
+TIME IN SECONDS 79.106 -- mlr cat /Users/kerl/tmp/big