address issues

Signed-off-by: chang-ning <spiderpower02@gmail.com>

Author: crazyguitar

src/gpu.rs

@@ -11,3 +11,11 @@ pub struct GpuMetrics {
     pub power_w: Option<f64>,
     pub clock_mhz: Option<u32>,
 }
+
+impl GpuMetrics {
+    /// True when no reading is available at all; readers report None then,
+    /// so the UI skips the gauge line instead of rendering all dashes.
+    pub fn is_empty(&self) -> bool {
+        *self == Self::default()
+    }
+}

src/nvlink.rs

@@ -281,7 +281,7 @@ fn read_device_snapshot(nvml: &Nvml, idx: u32) -> Option<NvLinkSnapshot> {
     Some(NvLinkSnapshot {
         gpu_index: idx,
         gpu_name,
-        metrics: Some(read_gpu_metrics(&device)),
+        metrics: Some(read_gpu_metrics(&device)).filter(|m| !m.is_empty()),
         link_count,
         link_gbps: if total_speed_gbps > 0.0 {
             Some(total_speed_gbps)

src/tui/ui.rs

@@ -759,7 +759,7 @@ fn draw_table(frame: &mut Frame, app: &mut App, area: Rect, tc: &ThemeColors) {
 }
 
 fn sparkline_str(data: &[f64], width: usize) -> String {
-    let max = data.iter().cloned().fold(0.0f64, f64::max);
+    let max = data.iter().copied().fold(0.0f64, f64::max);
     sparkline_scaled(data, width, max)
 }
 

src/xgmi.rs

@@ -527,7 +527,7 @@ fn read_processor_snapshot(
         link_gbps: (total_gbps > 0.0).then_some(total_gbps),
         correctable_errors,
         uncorrectable_errors,
-        metrics: Some(read_gpu_metrics(api, handle)),
+        metrics: Some(read_gpu_metrics(api, handle)).filter(|m| !m.is_empty()),
         links,
     })
 }