blob: de01af57bb4a705b371a2855650aa10944d52939 (
plain) (
blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
|
// Copyright Epic Games, Inc. All Rights Reserved.
#include <zenutil/filteredrate.h>
namespace zen {
void
FilteredRate::Start()
{
if (StartTimeUS == (uint64_t)-1)
{
uint64_t Expected = (uint64_t)-1;
if (StartTimeUS.compare_exchange_strong(Expected, Timer.GetElapsedTimeUs()))
{
LastTimeUS = StartTimeUS.load();
}
}
}
void
FilteredRate::Stop()
{
if (EndTimeUS == (uint64_t)-1)
{
uint64_t Expected = (uint64_t)-1;
EndTimeUS.compare_exchange_strong(Expected, Timer.GetElapsedTimeUs());
}
}
void
FilteredRate::Update(uint64_t Count)
{
if (LastTimeUS == (uint64_t)-1)
{
return;
}
uint64_t TimeUS = Timer.GetElapsedTimeUs();
uint64_t TimeDeltaUS = TimeUS - LastTimeUS;
if (TimeDeltaUS >= 2000000)
{
uint64_t Delta = Count - LastCount;
uint64_t PerSecond = (Delta * 1000000) / TimeDeltaUS;
FilteredPerSecond = (PerSecond + (LastPerSecond * 7)) / 8;
LastPerSecond = PerSecond;
LastCount = Count;
LastTimeUS = TimeUS;
}
}
uint64_t
FilteredRate::GetCurrent() const
{
if (LastTimeUS == (uint64_t)-1)
{
return 0;
}
return FilteredPerSecond;
}
uint64_t
FilteredRate::GetElapsedTimeUS() const
{
if (StartTimeUS == (uint64_t)-1)
{
return 0;
}
if (EndTimeUS == (uint64_t)-1)
{
return 0;
}
return EndTimeUS - StartTimeUS;
}
bool
FilteredRate::IsActive() const
{
return (StartTimeUS != (uint64_t)-1) && (EndTimeUS == (uint64_t)-1);
}
uint64_t
GetBytesPerSecond(uint64_t ElapsedWallTimeUS, uint64_t Count)
{
if (ElapsedWallTimeUS == 0)
{
return 0;
}
return Count * 1000000 / ElapsedWallTimeUS;
}
} // namespace zen
|