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53 lines
1.1 KiB
C++
53 lines
1.1 KiB
C++
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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#pragma once
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#include <cuda_runtime.h>
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#include <time.h>
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namespace faiss { namespace gpu {
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/// Utility class for timing execution of a kernel
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class KernelTimer {
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public:
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/// Constructor starts the timer and adds an event into the current
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/// device stream
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KernelTimer(cudaStream_t stream = 0);
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/// Destructor releases event resources
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~KernelTimer();
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/// Adds a stop event then synchronizes on the stop event to get the
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/// actual GPU-side kernel timings for any kernels launched in the
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/// current stream. Returns the number of milliseconds elapsed.
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/// Can only be called once.
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float elapsedMilliseconds();
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private:
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cudaEvent_t startEvent_;
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cudaEvent_t stopEvent_;
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cudaStream_t stream_;
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bool valid_;
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};
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/// CPU wallclock elapsed timer
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class CpuTimer {
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public:
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/// Creates and starts a new timer
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CpuTimer();
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/// Returns elapsed time in milliseconds
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float elapsedMilliseconds();
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private:
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struct timespec start_;
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};
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} } // namespace
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