Bitcoin ABC  0.22.12
P2P Digital Currency
lockedpool.cpp
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1 // Copyright (c) 2016 The Bitcoin Core developers
2 // Distributed under the MIT software license, see the accompanying
3 // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 
5 #include <bench/bench.h>
6 
7 #include <support/lockedpool.h>
8 
9 #include <vector>
10 
11 #define ASIZE 2048
12 #define BITER 5000
13 #define MSIZE 2048
14 
15 static void BenchLockedPool(benchmark::State &state) {
16  void *synth_base = reinterpret_cast<void *>(0x08000000);
17  const size_t synth_size = 1024 * 1024;
18  Arena b(synth_base, synth_size, 16);
19 
20  std::vector<void *> addr;
21  for (int x = 0; x < ASIZE; ++x) {
22  addr.push_back(nullptr);
23  }
24  uint32_t s = 0x12345678;
25  while (state.KeepRunning()) {
26  for (int x = 0; x < BITER; ++x) {
27  int idx = s & (addr.size() - 1);
28  if (s & 0x80000000) {
29  b.free(addr[idx]);
30  addr[idx] = nullptr;
31  } else if (!addr[idx]) {
32  addr[idx] = b.alloc((s >> 16) & (MSIZE - 1));
33  }
34  bool lsb = s & 1;
35  s >>= 1;
36  if (lsb) {
37  s ^= 0xf00f00f0; // LFSR period 0xf7ffffe0
38  }
39  }
40  }
41  for (void *ptr : addr) {
42  b.free(ptr);
43  }
44  addr.clear();
45 }
46 
BENCHMARK(BenchLockedPool, 1300)
bool KeepRunning()
Definition: bench.h:75
#define ASIZE
Definition: lockedpool.cpp:11
#define BITER
Definition: lockedpool.cpp:12
void * alloc(size_t size)
Allocate size bytes from this arena.
Definition: lockedpool.cpp:55
static void BenchLockedPool(benchmark::State &state)
Definition: lockedpool.cpp:15
#define MSIZE
Definition: lockedpool.cpp:13
void free(void *ptr)
Free a previously allocated chunk of memory.
Definition: lockedpool.cpp:96
An arena manages a contiguous region of memory by dividing it into chunks.
Definition: lockedpool.h:50