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collect timestamps in pairs

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This commit is contained in:
Marcos Slomp
2026-03-24 16:21:42 -07:00
parent 1c2c1b5c17
commit b0b3c8a335
1 changed files with 21 additions and 13 deletions
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34
public/tracy/TracyD3D12.hpp
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@@ -314,19 +314,20 @@ namespace tracy
}
UINT64* timestampBuffer = static_cast<UINT64*>(readbackBufferMapping);
for (uint64_t i = begin; i != latestCheckpoint; ++i)
// Process timestamp queries two at a time, as (start, end) pairs
for (uint64_t i = begin; i != latestCheckpoint; i += 2)
{
const uint32_t queryId = RingIndex(i);
UINT64& gpuTimestamp = timestampBuffer[queryId];
if (gpuTimestamp == InvalidTimestamp)
if (timestampBuffer[queryId+1] == InvalidTimestamp)
{
// drop the timestamp query if it's been in flight for too long
using Clock = std::chrono::high_resolution_clock;
auto now = Clock::now();
auto start = m_queryRequestTime[queryId];
auto start = m_queryRequestTime[queryId+1];
auto elapsed = now - start;
auto timeout = std::chrono::duration<float>{TRACY_D3D12_TIMESTAMP_COLLECT_TIMEOUT};
if (now - start >= timeout)
if (elapsed >= timeout)
{
TracyPlot("TracyD3D12 timeout", int64_t(0));
TracyPlot("TracyD3D12 timeout", int64_t(1));
@@ -340,15 +341,12 @@ namespace tracy
break;
}
auto* item = Profiler::QueueSerial();
MemWrite(&item->hdr.type, QueueType::GpuTime);
MemWrite(&item->gpuTime.gpuTime, static_cast<int64_t>(gpuTimestamp));
MemWrite(&item->gpuTime.queryId, static_cast<uint16_t>(queryId));
MemWrite(&item->gpuTime.context, GetId());
Profiler::QueueSerialFinish();
EmitGpuTime(timestampBuffer[queryId], queryId);
EmitGpuTime(timestampBuffer[queryId+1], queryId+1);
// "slow" write (to a readback heap memory)
timestampBuffer[queryId] = timestampBuffer[queryId+1] = InvalidTimestamp;
gpuTimestamp = InvalidTimestamp; // "slow" write (to a readback heap memory)
m_previousCheckpoint.store(i+1, std::memory_order_relaxed);
m_previousCheckpoint.store(i+2, std::memory_order_relaxed);
}
m_readbackBuffer->Unmap(0, &mapRange);
@@ -357,6 +355,16 @@ namespace tracy
}
private:
tracy_force_inline void EmitGpuTime(UINT64 gpuTimestamp, uint32_t queryId)
{
auto* item = Profiler::QueueSerial();
MemWrite(&item->hdr.type, QueueType::GpuTime);
MemWrite(&item->gpuTime.gpuTime, static_cast<int64_t>(gpuTimestamp));
MemWrite(&item->gpuTime.queryId, static_cast<uint16_t>(queryId));
MemWrite(&item->gpuTime.context, GetId());
Profiler::QueueSerialFinish();
}
tracy_force_inline uint32_t RingSize() const
{
return m_queryLimit;