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VideoOut: track guest-flip FPS and label load/stall gaps (#708)

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Headline FPS follows VideoOut submit cadence rather than host presents, and long gaps show LOAD/STALL instead of a stale multi-second MS average.
This commit is contained in:
kuba
2026-07-31 11:08:46 +02:00
committed by GitHub
parent c990b7799f
commit ec65419c0a
1 changed files with 58 additions and 29 deletions
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src/SharpEmu.Libs/VideoOut/PerfOverlay.cs
+58 -29
View File
@@ -30,6 +30,7 @@ public static class PerfOverlay
StringComparison.Ordinal);
private static long _lastPresentTimestamp;
private static long _lastSubmitTimestamp;
private static long _sessionStartTimestamp;
private static readonly double[] _frameMilliseconds = new double[FrameHistorySize];
private static int _frameHistoryIndex;
@@ -40,8 +41,11 @@ public static class PerfOverlay
// Refreshed once per second so per-frame fills never allocate.
private static long _statsWindowStart = Stopwatch.GetTimestamp();
// Headline FPS tracks guest VideoOut flips (RecordSubmit), not host
// swapchain presents. Metal's free-running present timer hits ~120 Hz on
// ProMotion even while the guest is stalled on GPU waits.
private static double _fps;
private static double _submittedFps;
private static double _presentFps;
private static double _drawsPerSecond;
private static double _averageFrameMs;
private static double _allocatedMbPerSecond;
@@ -64,24 +68,29 @@ public static class PerfOverlay
public static void Toggle() => _enabled = !_enabled;
/// <summary>Called by the presenter after each successful present.</summary>
/// <summary>Called by the presenter after each successful host present.</summary>
public static void RecordPresent()
{
var now = Stopwatch.GetTimestamp();
Interlocked.CompareExchange(ref _sessionStartTimestamp, now, 0);
var last = _lastPresentTimestamp;
_lastPresentTimestamp = now;
Interlocked.CompareExchange(ref _sessionStartTimestamp, Stopwatch.GetTimestamp(), 0);
Interlocked.Increment(ref _presentedInWindow);
if (last != 0)
{
var milliseconds = (now - last) * 1000.0 / Stopwatch.Frequency;
_frameMilliseconds[_frameHistoryIndex] = milliseconds;
_frameHistoryIndex = (_frameHistoryIndex + 1) % FrameHistorySize;
}
_lastPresentTimestamp = Stopwatch.GetTimestamp();
}
/// <summary>Called on every guest flip submission.</summary>
public static void RecordSubmit() => Interlocked.Increment(ref _submittedInWindow);
public static void RecordSubmit()
{
var now = Stopwatch.GetTimestamp();
Interlocked.CompareExchange(ref _sessionStartTimestamp, now, 0);
Interlocked.Increment(ref _submittedInWindow);
var last = Interlocked.Exchange(ref _lastSubmitTimestamp, now);
if (last != 0)
{
var milliseconds = (now - last) * 1000.0 / Stopwatch.Frequency;
var index = _frameHistoryIndex;
_frameMilliseconds[index] = milliseconds;
_frameHistoryIndex = (index + 1) % FrameHistorySize;
}
}
/// <summary>Called per translated draw/dispatch executed.</summary>
public static void RecordDraw() => Interlocked.Increment(ref _drawsInWindow);
@@ -128,27 +137,47 @@ public static class PerfOverlay
{
var seconds = (double)elapsedTicks / Stopwatch.Frequency;
_statsWindowStart = now;
_fps = Interlocked.Exchange(ref _presentedInWindow, 0) / seconds;
_submittedFps = Interlocked.Exchange(ref _submittedInWindow, 0) / seconds;
_fps = Interlocked.Exchange(ref _submittedInWindow, 0) / seconds;
_presentFps = Interlocked.Exchange(ref _presentedInWindow, 0) / seconds;
_drawsPerSecond = Interlocked.Exchange(ref _drawsInWindow, 0) / seconds;
double totalMs = 0;
var samples = 0;
foreach (var ms in _frameMilliseconds)
{
if (ms > 0)
{
totalMs += ms;
samples++;
}
}
_averageFrameMs = samples > 0 ? totalMs / samples : 0;
var allocated = GC.GetTotalAllocatedBytes(precise: false);
_allocatedMbPerSecond = (allocated - _lastAllocatedBytes) / seconds / (1024.0 * 1024.0);
_lastAllocatedBytes = allocated;
// Headline MS must track *current* guest cadence. Averaging the whole
// 128-slot history kept a single 8s boot gap on screen for minutes
// (FPS 0 + 8000 MS) even after the stall ended.
var lastSubmit = Interlocked.Read(ref _lastSubmitTimestamp);
string msLabel;
if (_fps > 0)
{
var lastIndex = (_frameHistoryIndex - 1 + FrameHistorySize) % FrameHistorySize;
var lastInterval = _frameMilliseconds[lastIndex];
_averageFrameMs = lastInterval > 0 ? lastInterval : 1000.0 / _fps;
msLabel = $"{_averageFrameMs:0.0} MS";
}
else if (lastSubmit != 0)
{
// No guest flips this window: show stall age, but label it so it
// is not read as "the game is rendering 20s frames" during boot
// asset load (ALLOC high, DRAWS 0 after splash).
_averageFrameMs = (now - lastSubmit) * 1000.0 / Stopwatch.Frequency;
msLabel = _allocatedMbPerSecond > 50.0
? $"LOAD {_averageFrameMs / 1000.0:0.0}S"
: $"STALL {_averageFrameMs / 1000.0:0.0}S";
}
else if (_presentFps > 0)
{
_averageFrameMs = 1000.0 / _presentFps;
msLabel = $"{_averageFrameMs:0.0} MS";
}
else
{
_averageFrameMs = 0;
msLabel = "0.0 MS";
}
var gen0 = GC.CollectionCount(0);
var gen1 = GC.CollectionCount(1);
var gen2 = GC.CollectionCount(2);
@@ -174,7 +203,7 @@ public static class PerfOverlay
var elapsedHours = elapsedSeconds / 3600;
var elapsedMinutes = elapsedSeconds / 60 % 60;
var elapsedRemainingSeconds = elapsedSeconds % 60;
_line1 = $"FPS {_fps:0.0} FLIP {_submittedFps:0.0} {_averageFrameMs:0.0} MS";
_line1 = $"FPS {_fps:0.0} PRES {_presentFps:0.0} {msLabel}";
_line2 = $"DRAWS {_drawsPerSecond:0}/S {drawsPerFrame:0}/F Q {pendingWork}+{inFlightSubmissions}";
_line3 = $"ALLOC {_allocatedMbPerSecond:0.0} MB/S GC {_gen0PerWindow}/{_gen1PerWindow}/{_gen2PerWindow}";
var heapMb = GC.GetTotalMemory(false) / (1024 * 1024);