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Timer.h
1 /**
2 * Copyright (c) 2015-present, Facebook, Inc.
3 * All rights reserved.
4 *
5 * This source code is licensed under the BSD+Patents license found in the
6 * LICENSE file in the root directory of this source tree.
7 */
8
9
10 #pragma once
11
12 #include <cuda_runtime.h>
13 #include <time.h>
14
15 namespace faiss { namespace gpu {
16
17 /// Utility class for timing execution of a kernel
18 class KernelTimer {
19 public:
20 /// Constructor starts the timer and adds an event into the current
21 /// device stream
22 KernelTimer(cudaStream_t stream = 0);
23
24 /// Destructor releases event resources
25 ~KernelTimer();
26
27 /// Adds a stop event then synchronizes on the stop event to get the
28 /// actual GPU-side kernel timings for any kernels launched in the
29 /// current stream. Returns the number of milliseconds elapsed.
30 /// Can only be called once.
31 float elapsedMilliseconds();
32
33 private:
34 cudaEvent_t startEvent_;
35 cudaEvent_t stopEvent_;
36 cudaStream_t stream_;
37 bool valid_;
38 };
39
40 /// CPU wallclock elapsed timer
41 class CpuTimer {
42 public:
43 /// Creates and starts a new timer
44 CpuTimer();
45
46 /// Returns elapsed time in milliseconds
47 float elapsedMilliseconds();
48
49 private:
50 struct timespec start_;
51 };
52
53 } } // namespace
faiss::gpu::CpuTimer::elapsedMilliseconds
float elapsedMilliseconds()
Returns elapsed time in milliseconds.
Definition: Timer.cpp:51
faiss::gpu::KernelTimer
Utility class for timing execution of a kernel.
Definition: Timer.h:18
faiss::gpu::CpuTimer
CPU wallclock elapsed timer.
Definition: Timer.h:41
faiss::gpu::KernelTimer::KernelTimer
KernelTimer(cudaStream_t stream=0)
Definition: Timer.cpp:16
faiss::gpu::CpuTimer::CpuTimer
CpuTimer()
Creates and starts a new timer.
Definition: Timer.cpp:46
faiss::gpu::KernelTimer::elapsedMilliseconds
float elapsedMilliseconds()
Definition: Timer.cpp:33
faiss::gpu::KernelTimer::~KernelTimer
~KernelTimer()
Destructor releases event resources.
Definition: Timer.cpp:27