Stats.cc
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1 /*
2  * Copyright (C) 1996-2022 The Squid Software Foundation and contributors
3  *
4  * Squid software is distributed under GPLv2+ license and includes
5  * contributions from numerous individuals and organizations.
6  * Please see the COPYING and CONTRIBUTORS files for details.
7  */
8 
9 #include "squid.h"
10 #include "sbuf/MemBlob.h"
11 #include "sbuf/SBuf.h"
12 #include "sbuf/Stats.h"
13 
14 #include <iostream>
15 
18 
19 void
21 {
24 }
25 
26 void
28 {
31 }
32 
33 SBufStats&
35 {
36  alloc += ss.alloc;
37  allocCopy += ss.allocCopy;
39  assignFast += ss.assignFast;
40  clear += ss.clear;
41  append += ss.append;
42  moves += ss.moves;
43  toStream += ss.toStream;
44  setChar += ss.setChar;
45  getChar += ss.getChar;
48  copyOut += ss.copyOut;
49  rawAccess += ss.rawAccess;
51  chop += ss.chop;
52  trim += ss.trim;
53  find += ss.find;
54  caseChange += ss.caseChange;
55  cowAvoided += ss.cowAvoided;
56  cowShift += ss.cowShift;
59  live += ss.live;
60 
61  return *this;
62 }
63 
64 std::ostream &
65 SBufStats::dump(std::ostream& os) const
66 {
67  MemBlobStats ststats = MemBlob::GetStats();
68  os <<
69  "SBuf stats:\nnumber of allocations: " << alloc <<
70  "\ncopy-allocations: " << allocCopy <<
71  "\ncopy-allocations from C String: " << allocFromCString <<
72  "\nlive references: " << live <<
73  "\nno-copy assignments: " << assignFast <<
74  "\nclearing operations: " << clear <<
75  "\nappend operations: " << append <<
76  "\nmove operations: " << moves <<
77  "\ndump-to-ostream: " << toStream <<
78  "\nset-char: " << setChar <<
79  "\nget-char: " << getChar <<
80  "\ncomparisons with data-scan: " << compareSlow <<
81  "\ncomparisons not requiring data-scan: " << compareFast <<
82  "\ncopy-out ops: " << copyOut <<
83  "\nraw access to memory: " << rawAccess <<
84  "\nNULL terminate C string: " << nulTerminate <<
85  "\nchop operations: " << chop <<
86  "\ntrim operations: " << trim <<
87  "\nfind: " << find <<
88  "\ncase-change ops: " << caseChange <<
89  "\nCOW completely avoided: " << cowAvoided <<
90  "\nCOW replaced with memmove(3): " << cowShift <<
91  "\nCOW requiring an empty buffer allocation: " << cowJustAlloc <<
92  "\nCOW requiring allocation and copying: " << cowAllocCopy <<
93  "\naverage store share factor: " <<
94  (ststats.live != 0 ? static_cast<float>(live)/ststats.live : 0) <<
95  std::endl;
96  return os;
97 }
98 
uint64_t toStream
number of write operations to ostreams
Definition: Stats.h:43
uint64_t alloc
number of calls to SBuf constructors
Definition: Stats.h:36
uint64_t chop
number of chop operations
Definition: Stats.h:51
SBufStats & operator+=(const SBufStats &)
Definition: Stats.cc:34
uint64_t compareFast
number of comparison operations not requiring data scan
Definition: Stats.h:47
uint64_t live
number of currently-allocated SBuf
Definition: Stats.h:59
uint64_t append
number of append operations
Definition: Stats.h:41
uint64_t trim
number of trim operations
Definition: Stats.h:52
uint64_t cowShift
number of cow() calls requiring just a memmove(3) inside an old buffer
Definition: Stats.h:56
uint64_t assignFast
number of no-copy assignment operations
Definition: Stats.h:39
uint64_t nulTerminate
number of c_str() terminations
Definition: Stats.h:50
static const MemBlobStats & GetStats()
obtain a const view of class-wide statistics
Definition: MemBlob.cc:149
static SizeRecorder SBufSizeAtDestructRecorder
collects statistics about SBuf sizes at SBuf destruction time
Definition: Stats.h:64
uint64_t live
number of MemBlob instances currently alive
Definition: MemBlob.h:31
void const char int sz
Definition: stub_cbdata.cc:16
void(*)(size_t) SizeRecorder
function for collecting detailed size-related statistics
Definition: Stats.h:62
uint64_t rawAccess
number of accesses to raw contents
Definition: Stats.h:49
uint64_t cowJustAlloc
number of cow() calls requiring just a new empty buffer
Definition: Stats.h:57
static void RecordMemBlobSizeAtDestruct(size_t)
Record the size a MemBlob had when it was destructed.
Definition: Stats.cc:27
uint64_t cowAvoided
number of cow() calls requiring no expensive operations
Definition: Stats.h:55
static SizeRecorder MemBlobSizeAtDestructRecorder
collects statistics about MemBlob capacity at MemBlob destruction time
Definition: Stats.h:66
uint64_t caseChange
number of toUpper and toLower operations
Definition: Stats.h:54
uint64_t find
number of find operations
Definition: Stats.h:53
Various MemBlob class-wide statistics.
Definition: MemBlob.h:20
uint64_t clear
number of clear operations
Definition: Stats.h:40
uint64_t cowAllocCopy
number of cow() calls requiring copying into a new buffer
Definition: Stats.h:58
uint64_t allocCopy
number of calls to SBuf copy-constructor
Definition: Stats.h:37
uint64_t allocFromCString
number of copy-allocations from c-strings
Definition: Stats.h:38
std::ostream & dump(std::ostream &os) const
Dump statistics to an ostream.
Definition: Stats.cc:65
uint64_t compareSlow
number of comparison operations requiring data scan
Definition: Stats.h:46
uint64_t setChar
number of calls to setAt
Definition: Stats.h:44
uint64_t getChar
number of calls to at() and operator[]
Definition: Stats.h:45
static void RecordSBufSizeAtDestruct(size_t)
Record the size a SBuf had when it was destructed.
Definition: Stats.cc:20
uint64_t moves
number of move constructions/assignments
Definition: Stats.h:42
uint64_t copyOut
number of data-copies to other forms of buffers
Definition: Stats.h:48

 

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