]>
Commit | Line | Data |
---|---|---|
7c673cae FG |
1 | // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*- |
2 | // vim: ts=8 sw=2 smarttab | |
3 | /* | |
4 | * Ceph - scalable distributed file system | |
5 | * | |
6 | * Copyright (C) 2004-2006 Sage Weil <sage@newdream.net> | |
7 | * | |
8 | * This is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU Lesser General Public | |
10 | * License version 2.1, as published by the Free Software | |
11 | * Foundation. See file COPYING. | |
12 | * | |
13 | */ | |
14 | ||
15 | #include "DecayCounter.h" | |
16 | #include "Formatter.h" | |
17 | ||
11fdf7f2 TL |
18 | #include "include/encoding.h" |
19 | ||
f67539c2 | 20 | void DecayCounter::encode(ceph::buffer::list& bl) const |
7c673cae | 21 | { |
11fdf7f2 TL |
22 | decay(); |
23 | ENCODE_START(5, 4, bl); | |
24 | encode(val, bl); | |
7c673cae FG |
25 | ENCODE_FINISH(bl); |
26 | } | |
27 | ||
f67539c2 | 28 | void DecayCounter::decode(ceph::buffer::list::const_iterator &p) |
7c673cae | 29 | { |
11fdf7f2 | 30 | DECODE_START_LEGACY_COMPAT_LEN(5, 4, 4, p); |
7c673cae | 31 | if (struct_v < 2) { |
92f5a8d4 TL |
32 | double k = 0.0; |
33 | decode(k, p); | |
7c673cae FG |
34 | } |
35 | if (struct_v < 3) { | |
11fdf7f2 TL |
36 | double k = 0.0; |
37 | decode(k, p); | |
38 | } | |
39 | decode(val, p); | |
40 | if (struct_v < 5) { | |
41 | double delta, _; | |
42 | decode(delta, p); | |
43 | val += delta; | |
44 | decode(_, p); /* velocity */ | |
7c673cae | 45 | } |
11fdf7f2 | 46 | last_decay = clock::now(); |
7c673cae FG |
47 | DECODE_FINISH(p); |
48 | } | |
49 | ||
f67539c2 | 50 | void DecayCounter::dump(ceph::Formatter *f) const |
7c673cae | 51 | { |
11fdf7f2 | 52 | decay(); |
7c673cae | 53 | f->dump_float("value", val); |
92f5a8d4 | 54 | f->dump_float("halflife", rate.get_halflife()); |
7c673cae FG |
55 | } |
56 | ||
11fdf7f2 | 57 | void DecayCounter::generate_test_instances(std::list<DecayCounter*>& ls) |
7c673cae | 58 | { |
11fdf7f2 | 59 | DecayCounter *counter = new DecayCounter(); |
7c673cae | 60 | counter->val = 3.0; |
7c673cae | 61 | ls.push_back(counter); |
11fdf7f2 | 62 | counter = new DecayCounter(); |
7c673cae FG |
63 | ls.push_back(counter); |
64 | } | |
65 | ||
11fdf7f2 | 66 | void DecayCounter::decay(double delta) const |
7c673cae | 67 | { |
11fdf7f2 TL |
68 | auto now = clock::now(); |
69 | double el = std::chrono::duration<double>(now - last_decay).count(); | |
7c673cae | 70 | |
11fdf7f2 TL |
71 | // calculate new value |
72 | double newval = val * exp(el * rate.k) + delta; | |
73 | if (newval < .01) { | |
74 | newval = 0.0; | |
7c673cae | 75 | } |
11fdf7f2 TL |
76 | |
77 | val = newval; | |
78 | last_decay = now; | |
7c673cae | 79 | } |