Function detect_system_memory_bytes

nodedb/src/event/slab_budget.rs:220–231

Detect total system memory in bytes by reading `/proc/meminfo`. Returns `None` if the file cannot be read or parsed (non-Linux, containers with restricted procfs, etc.). Callers should fall back to a hardcoded default.

()

/// Returns `None` if the file cannot be read or parsed (non-Linux, containers
/// with restricted procfs, etc.). Callers should fall back to a hardcoded default.
fn detect_system_memory_bytes() -> Option<u64> {
    let contents = std::fs::read_to_string("/proc/meminfo").ok()?;
    for line in contents.lines() {
        if let Some(rest) = line.strip_prefix("MemTotal:") {
            // Format: "MemTotal:       16384000 kB"
            let kb_str = rest.trim().strip_suffix("kB")?.trim();
            let kb: u64 = kb_str.parse().ok()?;
            return Some(kb * 1024);
        }
    }
    None
}

#[cfg(test)]
mod tests {