1 /*
2 * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved.
3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4 *
5 * This code is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License version 2 only, as
7 * published by the Free Software Foundation.
8 *
9 * This code is distributed in the hope that it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
12 * version 2 for more details (a copy is included in the LICENSE file that
13 * accompanied this code).
14 *
15 * You should have received a copy of the GNU General Public License version
16 * 2 along with this work; if not, write to the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
18 *
19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
20 * or visit www.oracle.com if you need additional information or have any
21 * questions.
22 *
32 // the magnitude of the value being stored, and the second array maintains
33 // the low resolution histogram within that magnitude. For example, storing
34 // 4.352819 * 10^3 increments the bucket _hdr[3][435]. This allows for
35 // memory efficient storage of huge amount of samples.
36 //
37 // Accepts positive numbers only.
38 class HdrSeq: public NumberSeq {
39 private:
40 enum PrivateConstants {
41 ValBuckets = 512,
42 MagBuckets = 24,
43 MagMinimum = -12
44 };
45 int** _hdr;
46
47 public:
48 HdrSeq();
49 ~HdrSeq();
50
51 virtual void add(double val);
52 double percentile(double level) const;
53 };
54
55 // Binary magnitude sequence stores the power-of-two histogram.
56 // It has very low memory requirements, and is thread-safe. When accuracy
57 // is not needed, it is preferred over HdrSeq.
58 class BinaryMagnitudeSeq : public CHeapObj<mtGC> {
59 private:
60 size_t _sum;
61 size_t* _mags;
62
63 public:
64 BinaryMagnitudeSeq();
65 ~BinaryMagnitudeSeq();
66
67 void add(size_t val);
68 size_t num() const;
69 size_t level(int level) const;
70 size_t sum() const;
71 int min_level() const;
72 int max_level() const;
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1 /*
2 * Copyright (c) 2018, 2019, Red Hat, Inc. All rights reserved.
3 * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
6 * This code is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 only, as
8 * published by the Free Software Foundation.
9 *
10 * This code is distributed in the hope that it will be useful, but WITHOUT
11 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
12 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * version 2 for more details (a copy is included in the LICENSE file that
14 * accompanied this code).
15 *
16 * You should have received a copy of the GNU General Public License version
17 * 2 along with this work; if not, write to the Free Software Foundation,
18 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
19 *
20 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
21 * or visit www.oracle.com if you need additional information or have any
22 * questions.
23 *
33 // the magnitude of the value being stored, and the second array maintains
34 // the low resolution histogram within that magnitude. For example, storing
35 // 4.352819 * 10^3 increments the bucket _hdr[3][435]. This allows for
36 // memory efficient storage of huge amount of samples.
37 //
38 // Accepts positive numbers only.
39 class HdrSeq: public NumberSeq {
40 private:
41 enum PrivateConstants {
42 ValBuckets = 512,
43 MagBuckets = 24,
44 MagMinimum = -12
45 };
46 int** _hdr;
47
48 public:
49 HdrSeq();
50 ~HdrSeq();
51
52 virtual void add(double val);
53 void add(const HdrSeq& other);
54 double percentile(double level) const;
55 void clear();
56 };
57
58 // Binary magnitude sequence stores the power-of-two histogram.
59 // It has very low memory requirements, and is thread-safe. When accuracy
60 // is not needed, it is preferred over HdrSeq.
61 class BinaryMagnitudeSeq : public CHeapObj<mtGC> {
62 private:
63 size_t _sum;
64 size_t* _mags;
65
66 public:
67 BinaryMagnitudeSeq();
68 ~BinaryMagnitudeSeq();
69
70 void add(size_t val);
71 size_t num() const;
72 size_t level(int level) const;
73 size_t sum() const;
74 int min_level() const;
75 int max_level() const;
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