mirror of
https://github.com/Z3Prover/z3
synced 2025-10-08 17:01:55 +00:00
remove files, increase num iterations on benchmark
This commit is contained in:
Don Syme
parent
feab4f6bf8
commit
e2d725ee95
8 changed files with 1 additions and 867 deletions
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-- Check for working CXX compiler: /usr/bin/c++ - skipped
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-- Detecting CXX compile features
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[36/52] Building CXX object src/util/CMakeFiles/util.dir/mpz.cpp.o
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp: In instantiation of ‘bool mpz_manager<SYNCH>::is_perfect_square(const mpz&, mpz&) [with bool SYNCH = true]’:
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp:2587:16: required from here
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp:2335:10: warning: unused variable ‘first’ [-Wunused-variable]
|
||||
2335 | bool first = true;
|
||||
| ^~~~~
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp: In instantiation of ‘bool mpz_manager<SYNCH>::is_perfect_square(const mpz&, mpz&) [with bool SYNCH = false]’:
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp:2589:16: required from here
|
||||
/home/runner/work/z3/z3/src/util/mpz.cpp:2335:10: warning: unused variable ‘first’ [-Wunused-variable]
|
||||
[37/52] Building CXX object src/util/CMakeFiles/util.dir/scoped_timer.cpp.o
|
||||
[38/52] Building CXX object src/util/CMakeFiles/util.dir/sexpr.cpp.o
|
||||
[39/52] Building CXX object src/util/CMakeFiles/util.dir/small_object_allocator.cpp.o
|
||||
[40/52] Building CXX object src/util/CMakeFiles/util.dir/stack.cpp.o
|
||||
[41/52] Building CXX object src/util/CMakeFiles/util.dir/smt2_util.cpp.o
|
||||
[42/52] Building CXX object src/util/CMakeFiles/util.dir/symbol.cpp.o
|
||||
[43/52] Building CXX object src/util/CMakeFiles/util.dir/timeout.cpp.o
|
||||
[44/52] Building CXX object src/util/CMakeFiles/util.dir/timeit.cpp.o
|
||||
[45/52] Building CXX object src/util/CMakeFiles/util.dir/tbv.cpp.o
|
||||
[46/52] Building CXX object src/util/CMakeFiles/util.dir/state_graph.cpp.o
|
||||
[47/52] Building CXX object src/util/CMakeFiles/util.dir/statistics.cpp.o
|
||||
[48/52] Building CXX object src/util/CMakeFiles/util.dir/util.cpp.o
|
||||
[49/52] Building CXX object src/util/CMakeFiles/util.dir/z3_exception.cpp.o
|
||||
[50/52] Building CXX object src/util/CMakeFiles/util.dir/warning.cpp.o
|
||||
[51/52] Building CXX object src/util/CMakeFiles/util.dir/zstring.cpp.o
|
||||
[52/52] Building CXX object src/util/CMakeFiles/util.dir/trace.cpp.o
|
||||
[0/1] Re-running CMake...
|
||||
-- Z3 version 4.15.4.0
|
||||
-- Found simple git working directory
|
||||
-- Found git directory "/home/runner/work/z3/z3/.git"
|
||||
-- Adding git dependency "/home/runner/work/z3/z3/.git/HEAD"
|
||||
-- Adding git dependency "/home/runner/work/z3/z3/.git/refs/heads/perf/xxhash-optimization"
|
||||
-- Using Git hash in version output: 5b70f75d89d20e2ada9f319fb17ecfa920da115e
|
||||
-- Not including git description in version
|
||||
-- CMake generator: Ninja
|
||||
-- Build type: RelWithDebInfo
|
||||
-- Python3_EXECUTABLE: /usr/bin/python3.12
|
||||
-- Detected target architecture: x86_64
|
||||
-- Not using libgmp
|
||||
-- Not using Z3_API_LOG_SYNC
|
||||
-- Thread-safe build
|
||||
-- C++ compiler supports -Wall
|
||||
-- Treating only serious compiler warnings as errors
|
||||
-- C++ compiler supports -Werror=odr
|
||||
-- C++ compiler supports -Werror=return-type
|
||||
-- LTO disabled
|
||||
-- CMAKE_CXX_FLAGS: "-fno-omit-frame-pointer -Werror=odr -Werror=return-type "
|
||||
-- CMAKE_EXE_LINKER_FLAGS: ""
|
||||
-- CMAKE_STATIC_LINKER_FLAGS: ""
|
||||
-- CMAKE_SHARED_LINKER_FLAGS: ""
|
||||
-- CMAKE_CXX_FLAGS_RELWITHDEBINFO: "-O2 -g -DNDEBUG"
|
||||
-- CMAKE_EXE_LINKER_FLAGS_RELWITHDEBINFO: ""
|
||||
-- CMAKE_SHARED_LINKER_FLAGS_RELWITHDEBINFO: ""
|
||||
-- CMAKE_STATIC_LINKER_FLAGS_RELWITHDEBINFO: ""
|
||||
-- Z3_COMPONENT_CXX_DEFINES: $<$<CONFIG:Debug>:Z3DEBUG>;$<$<CONFIG:Release>:_EXTERNAL_RELEASE>;$<$<CONFIG:RelWithDebInfo>:_EXTERNAL_RELEASE>;-D_MP_INTERNAL;-D_TRACE
|
||||
-- Z3_COMPONENT_CXX_FLAGS: -mfpmath=sse;-msse;-msse2;-Wall
|
||||
-- Z3_DEPENDENT_LIBS: Threads::Threads
|
||||
-- Z3_COMPONENT_EXTRA_INCLUDE_DIRS: /home/runner/work/z3/z3/build/src;/home/runner/work/z3/z3/src
|
||||
-- Z3_DEPENDENT_EXTRA_CXX_LINK_FLAGS:
|
||||
-- CMAKE_INSTALL_LIBDIR: "lib"
|
||||
-- CMAKE_INSTALL_BINDIR: "bin"
|
||||
-- CMAKE_INSTALL_INCLUDEDIR: "include"
|
||||
-- CMAKE_INSTALL_PKGCONFIGDIR: "lib/pkgconfig"
|
||||
-- CMAKE_INSTALL_Z3_CMAKE_PACKAGE_DIR: "lib/cmake/z3"
|
||||
-- Adding component util
|
||||
-- Adding component polynomial
|
||||
-- Adding rule to generate "algebraic_params.hpp"
|
||||
-- Adding component dd
|
||||
-- Adding component hilbert
|
||||
-- Adding component simplex
|
||||
-- Adding component interval
|
||||
-- Adding component realclosure
|
||||
-- Adding rule to generate "rcf_params.hpp"
|
||||
-- Adding component subpaving
|
||||
-- Adding component ast
|
||||
-- Adding rule to generate "pp_params.hpp"
|
||||
-- Adding component params
|
||||
-- Adding rule to generate "arith_rewriter_params.hpp"
|
||||
-- Adding rule to generate "array_rewriter_params.hpp"
|
||||
-- Adding rule to generate "bool_rewriter_params.hpp"
|
||||
-- Adding rule to generate "bv_rewriter_params.hpp"
|
||||
-- Adding rule to generate "fpa_rewriter_params.hpp"
|
||||
-- Adding rule to generate "fpa2bv_rewriter_params.hpp"
|
||||
-- Adding rule to generate "pattern_inference_params_helper.hpp"
|
||||
-- Adding rule to generate "poly_rewriter_params.hpp"
|
||||
-- Adding rule to generate "rewriter_params.hpp"
|
||||
-- Adding rule to generate "sat_params.hpp"
|
||||
-- Adding rule to generate "seq_rewriter_params.hpp"
|
||||
-- Adding rule to generate "sls_params.hpp"
|
||||
-- Adding rule to generate "smt_params_helper.hpp"
|
||||
-- Adding rule to generate "solver_params.hpp"
|
||||
-- Adding rule to generate "tactic_params.hpp"
|
||||
-- Adding component rewriter
|
||||
-- Adding component bit_blaster
|
||||
-- Adding component normal_forms
|
||||
-- Adding rule to generate "nnf_params.hpp"
|
||||
-- Adding component macros
|
||||
-- Adding component model
|
||||
-- Adding rule to generate "model_evaluator_params.hpp"
|
||||
-- Adding rule to generate "model_params.hpp"
|
||||
-- Adding component euf
|
||||
-- Adding component converters
|
||||
-- Adding component substitution
|
||||
-- Adding component simplifiers
|
||||
-- Adding component tactic
|
||||
-- Adding component mbp
|
||||
-- Adding component qe_lite
|
||||
-- Adding component parser_util
|
||||
-- Adding rule to generate "parser_params.hpp"
|
||||
-- Adding component grobner
|
||||
-- Adding component sat
|
||||
-- Adding rule to generate "sat_asymm_branch_params.hpp"
|
||||
-- Adding rule to generate "sat_scc_params.hpp"
|
||||
-- Adding rule to generate "sat_simplifier_params.hpp"
|
||||
-- Adding component nlsat
|
||||
-- Adding rule to generate "nlsat_params.hpp"
|
||||
-- Adding component core_tactics
|
||||
-- Adding component subpaving_tactic
|
||||
-- Adding component aig_tactic
|
||||
-- Adding component arith_tactics
|
||||
-- Adding component solver
|
||||
-- Adding rule to generate "combined_solver_params.hpp"
|
||||
-- Adding rule to generate "parallel_params.hpp"
|
||||
-- Adding component cmd_context
|
||||
-- Adding component extra_cmds
|
||||
-- Adding component smt2parser
|
||||
-- Adding component solver_assertions
|
||||
-- Adding component pattern
|
||||
-- Adding component lp
|
||||
-- Adding rule to generate "lp_params_helper.hpp"
|
||||
-- Adding component ast_sls
|
||||
-- Adding component sat_smt
|
||||
-- Adding component sat_tactic
|
||||
-- Adding component nlsat_tactic
|
||||
-- Adding component ackermannization
|
||||
-- Adding rule to generate "ackermannization_params.hpp"
|
||||
-- Adding rule to generate "ackermannize_bv_tactic_params.hpp"
|
||||
-- Adding component proofs
|
||||
-- Adding component fpa
|
||||
-- Adding component proto_model
|
||||
-- Adding component smt
|
||||
-- Adding component bv_tactics
|
||||
-- Adding component smt_tactic
|
||||
-- Adding component sls_tactic
|
||||
-- Adding component qe
|
||||
-- Adding component muz
|
||||
-- Adding rule to generate "fp_params.hpp"
|
||||
-- Adding component dataflow
|
||||
-- Adding component transforms
|
||||
-- Adding component rel
|
||||
-- Adding component clp
|
||||
-- Adding component tab
|
||||
-- Adding component bmc
|
||||
-- Adding component ddnf
|
||||
-- Adding component spacer
|
||||
-- Adding component fp
|
||||
-- Adding component ufbv_tactic
|
||||
-- Adding component sat_solver
|
||||
-- Adding component smtlogic_tactics
|
||||
-- Adding rule to generate "qfufbv_tactic_params.hpp"
|
||||
-- Adding component fpa_tactics
|
||||
-- Adding component fd_solver
|
||||
-- Adding component portfolio
|
||||
-- Adding component opt
|
||||
-- Adding rule to generate "opt_params.hpp"
|
||||
-- Adding component api
|
||||
-- Adding component api_dll
|
||||
-- Adding component fuzzing
|
||||
-- Building documentation disabled
|
||||
-- Configuring done (0.3s)
|
||||
-- Generating done (0.2s)
|
||||
-- Build files have been written to: /home/runner/work/z3/z3/build
|
||||
[1/3] Building CXX object src/util/CMakeFiles/util.dir/hash.cpp.o
|
||||
/home/runner/work/z3/z3/src/util/hash.cpp:107:17: warning: ‘unsigned int read_unsigned(const char*)’ defined but not used [-Wunused-function]
|
||||
107 | static unsigned read_unsigned(const char *s) {
|
||||
| ^~~~~~~~~~~~~
|
||||
[2/3] Building CXX object src/util/CMakeFiles/util.dir/debug.cpp.o
|
||||
BIN
xxhash_benchmark
BIN
xxhash_benchmark
Binary file not shown.
|
|
@ -1,216 +0,0 @@
|
|||
#include <iostream>
|
||||
#include <chrono>
|
||||
#include <vector>
|
||||
#include <string>
|
||||
#include <cstring>
|
||||
#include <random>
|
||||
|
||||
// Include Z3's original hash functions
|
||||
#define mix(a,b,c) \
|
||||
{ \
|
||||
a -= b; a -= c; a ^= (c>>13); \
|
||||
b -= c; b -= a; b ^= (a<<8); \
|
||||
c -= a; c -= b; c ^= (b>>13); \
|
||||
a -= b; a -= c; a ^= (c>>12); \
|
||||
b -= c; b -= a; b ^= (a<<16); \
|
||||
c -= a; c -= b; c ^= (b>>5); \
|
||||
a -= b; a -= c; a ^= (c>>3); \
|
||||
b -= c; b -= a; b ^= (a<<10); \
|
||||
c -= a; c -= b; c ^= (b>>15); \
|
||||
}
|
||||
|
||||
static unsigned read_unsigned(const char *s) {
|
||||
unsigned n;
|
||||
memcpy(&n, s, sizeof(unsigned));
|
||||
return n;
|
||||
}
|
||||
|
||||
// Original Z3 string_hash (Bob Jenkins)
|
||||
unsigned string_hash_original(const char * str, unsigned length, unsigned init_value) {
|
||||
unsigned a, b, c, len;
|
||||
len = length;
|
||||
a = b = 0x9e3779b9;
|
||||
c = init_value;
|
||||
|
||||
while (len >= 12) {
|
||||
a += read_unsigned(str);
|
||||
b += read_unsigned(str+4);
|
||||
c += read_unsigned(str+8);
|
||||
mix(a,b,c);
|
||||
str += 12; len -= 12;
|
||||
}
|
||||
|
||||
c += length;
|
||||
switch(len) {
|
||||
case 11: c+=((unsigned)str[10]<<24);
|
||||
case 10: c+=((unsigned)str[9]<<16);
|
||||
case 9 : c+=((unsigned)str[8]<<8);
|
||||
case 8 : b+=((unsigned)str[7]<<24);
|
||||
case 7 : b+=((unsigned)str[6]<<16);
|
||||
case 6 : b+=((unsigned)str[5]<<8);
|
||||
case 5 : b+=str[4];
|
||||
case 4 : a+=((unsigned)str[3]<<24);
|
||||
case 3 : a+=((unsigned)str[2]<<16);
|
||||
case 2 : a+=((unsigned)str[1]<<8);
|
||||
case 1 : a+=str[0];
|
||||
break;
|
||||
}
|
||||
mix(a,b,c);
|
||||
return c;
|
||||
}
|
||||
|
||||
// Compact xxHash32 implementation optimized for Z3
|
||||
static const uint32_t XXHASH_PRIME1 = 0x9E3779B1U;
|
||||
static const uint32_t XXHASH_PRIME2 = 0x85EBCA77U;
|
||||
static const uint32_t XXHASH_PRIME3 = 0xC2B2AE3DU;
|
||||
static const uint32_t XXHASH_PRIME4 = 0x27D4EB2FU;
|
||||
static const uint32_t XXHASH_PRIME5 = 0x165667B1U;
|
||||
|
||||
static inline uint32_t xxhash_rotl32(uint32_t x, int r) {
|
||||
return (x << r) | (x >> (32 - r));
|
||||
}
|
||||
|
||||
static inline uint32_t xxhash_read32le(const void* ptr) {
|
||||
uint32_t val;
|
||||
memcpy(&val, ptr, sizeof(val));
|
||||
return val;
|
||||
}
|
||||
|
||||
// xxHash32 optimized for Z3's usage patterns
|
||||
unsigned string_hash_xxhash(const char* data, unsigned len, unsigned seed) {
|
||||
const uint8_t* p = (const uint8_t*)data;
|
||||
const uint8_t* const bEnd = p + len;
|
||||
uint32_t h32;
|
||||
|
||||
if (len >= 16) {
|
||||
const uint8_t* const limit = bEnd - 16;
|
||||
uint32_t v1 = seed + XXHASH_PRIME1 + XXHASH_PRIME2;
|
||||
uint32_t v2 = seed + XXHASH_PRIME2;
|
||||
uint32_t v3 = seed + 0;
|
||||
uint32_t v4 = seed - XXHASH_PRIME1;
|
||||
|
||||
do {
|
||||
v1 = xxhash_rotl32(v1 + xxhash_read32le(p) * XXHASH_PRIME2, 13) * XXHASH_PRIME1;
|
||||
p += 4;
|
||||
v2 = xxhash_rotl32(v2 + xxhash_read32le(p) * XXHASH_PRIME2, 13) * XXHASH_PRIME1;
|
||||
p += 4;
|
||||
v3 = xxhash_rotl32(v3 + xxhash_read32le(p) * XXHASH_PRIME2, 13) * XXHASH_PRIME1;
|
||||
p += 4;
|
||||
v4 = xxhash_rotl32(v4 + xxhash_read32le(p) * XXHASH_PRIME2, 13) * XXHASH_PRIME1;
|
||||
p += 4;
|
||||
} while (p <= limit);
|
||||
|
||||
h32 = xxhash_rotl32(v1, 1) + xxhash_rotl32(v2, 7) + xxhash_rotl32(v3, 12) + xxhash_rotl32(v4, 18);
|
||||
} else {
|
||||
h32 = seed + XXHASH_PRIME5;
|
||||
}
|
||||
|
||||
h32 += (uint32_t) len;
|
||||
|
||||
while (p + 4 <= bEnd) {
|
||||
h32 += xxhash_read32le(p) * XXHASH_PRIME3;
|
||||
h32 = xxhash_rotl32(h32, 17) * XXHASH_PRIME4;
|
||||
p += 4;
|
||||
}
|
||||
|
||||
while (p < bEnd) {
|
||||
h32 += (*p) * XXHASH_PRIME5;
|
||||
h32 = xxhash_rotl32(h32, 11) * XXHASH_PRIME1;
|
||||
p++;
|
||||
}
|
||||
|
||||
h32 ^= h32 >> 15;
|
||||
h32 *= XXHASH_PRIME2;
|
||||
h32 ^= h32 >> 13;
|
||||
h32 *= XXHASH_PRIME3;
|
||||
h32 ^= h32 >> 16;
|
||||
|
||||
return h32;
|
||||
}
|
||||
|
||||
// Test data generation
|
||||
std::vector<std::string> generate_test_data(size_t count, size_t min_len, size_t max_len) {
|
||||
std::vector<std::string> data;
|
||||
data.reserve(count);
|
||||
|
||||
std::random_device rd;
|
||||
std::mt19937 gen(42); // Fixed seed for reproducibility
|
||||
std::uniform_int_distribution<> len_dist(min_len, max_len);
|
||||
std::uniform_int_distribution<> char_dist(32, 126); // Printable ASCII
|
||||
|
||||
for (size_t i = 0; i < count; ++i) {
|
||||
size_t len = len_dist(gen);
|
||||
std::string s;
|
||||
s.reserve(len);
|
||||
for (size_t j = 0; j < len; ++j) {
|
||||
s.push_back(static_cast<char>(char_dist(gen)));
|
||||
}
|
||||
data.push_back(std::move(s));
|
||||
}
|
||||
return data;
|
||||
}
|
||||
|
||||
// Benchmark function
|
||||
template<typename HashFunc>
|
||||
double benchmark_hash_function(const std::vector<std::string>& test_data, HashFunc hash_func, int iterations = 100) {
|
||||
auto start = std::chrono::high_resolution_clock::now();
|
||||
|
||||
volatile unsigned result = 0; // Prevent optimization
|
||||
for (int iter = 0; iter < iterations; ++iter) {
|
||||
for (const auto& str : test_data) {
|
||||
result += hash_func(str.c_str(), str.length(), 0);
|
||||
}
|
||||
}
|
||||
|
||||
auto end = std::chrono::high_resolution_clock::now();
|
||||
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
|
||||
|
||||
// Prevent dead code elimination
|
||||
if (result == 0xDEADBEEF) std::cout << "Impossible";
|
||||
|
||||
return duration.count() / 1000.0; // Return milliseconds
|
||||
}
|
||||
|
||||
int main() {
|
||||
std::cout << "=== Z3 Hash Function Performance Benchmark ===" << std::endl;
|
||||
|
||||
// Generate test data that represents typical Z3 usage
|
||||
std::vector<std::string> short_strings = generate_test_data(50000, 4, 32); // Symbols, variables
|
||||
std::vector<std::string> medium_strings = generate_test_data(10000, 32, 128); // Terms, expressions
|
||||
std::vector<std::string> long_strings = generate_test_data(1000, 128, 512); // Large expressions
|
||||
|
||||
std::cout << "\n--- Short Strings (4-32 chars, 50K strings, 100 iterations) ---" << std::endl;
|
||||
double orig_short = benchmark_hash_function(short_strings, string_hash_original);
|
||||
double xxh_short = benchmark_hash_function(short_strings, string_hash_xxhash);
|
||||
|
||||
std::cout << "Original (Bob Jenkins): " << orig_short << " ms" << std::endl;
|
||||
std::cout << "xxHash32: " << xxh_short << " ms" << std::endl;
|
||||
std::cout << "Speedup: " << (orig_short / xxh_short) << "x" << std::endl;
|
||||
|
||||
std::cout << "\n--- Medium Strings (32-128 chars, 10K strings, 100 iterations) ---" << std::endl;
|
||||
double orig_medium = benchmark_hash_function(medium_strings, string_hash_original);
|
||||
double xxh_medium = benchmark_hash_function(medium_strings, string_hash_xxhash);
|
||||
|
||||
std::cout << "Original (Bob Jenkins): " << orig_medium << " ms" << std::endl;
|
||||
std::cout << "xxHash32: " << xxh_medium << " ms" << std::endl;
|
||||
std::cout << "Speedup: " << (orig_medium / xxh_medium) << "x" << std::endl;
|
||||
|
||||
std::cout << "\n--- Long Strings (128-512 chars, 1K strings, 100 iterations) ---" << std::endl;
|
||||
double orig_long = benchmark_hash_function(long_strings, string_hash_original);
|
||||
double xxh_long = benchmark_hash_function(long_strings, string_hash_xxhash);
|
||||
|
||||
std::cout << "Original (Bob Jenkins): " << orig_long << " ms" << std::endl;
|
||||
std::cout << "xxHash32: " << xxh_long << " ms" << std::endl;
|
||||
std::cout << "Speedup: " << (orig_long / xxh_long) << "x" << std::endl;
|
||||
|
||||
// Overall performance metrics
|
||||
double total_orig = orig_short + orig_medium + orig_long;
|
||||
double total_xxh = xxh_short + xxh_medium + xxh_long;
|
||||
|
||||
std::cout << "\n=== Overall Performance Summary ===" << std::endl;
|
||||
std::cout << "Total Original: " << total_orig << " ms" << std::endl;
|
||||
std::cout << "Total xxHash: " << total_xxh << " ms" << std::endl;
|
||||
std::cout << "Overall Speedup: " << (total_orig / total_xxh) << "x" << std::endl;
|
||||
|
||||
return 0;
|
||||
}
|
||||
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@ -197,7 +197,7 @@ std::vector<std::string> generate_test_data() {
|
|||
|
||||
template<typename HashFunc>
|
||||
double benchmark_hash(const std::vector<std::string>& data, HashFunc hash_func, const std::string& name) {
|
||||
const int iterations = 100;
|
||||
const int iterations = 10000;
|
||||
|
||||
auto start = std::chrono::high_resolution_clock::now();
|
||||
volatile unsigned result = 0;
|
||||
|
|
|
|||
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|
@ -1,172 +0,0 @@
|
|||
#include <iostream>
|
||||
#include <chrono>
|
||||
#include <vector>
|
||||
#include <string>
|
||||
#include <random>
|
||||
#include <cassert>
|
||||
#include <iomanip>
|
||||
|
||||
// Include Z3's hash headers to test the actual implementation
|
||||
#include "src/util/hash.h"
|
||||
|
||||
// Test with both enabled and disabled xxHash to measure improvement
|
||||
unsigned string_hash_original_reference(const char * str, unsigned length, unsigned init_value);
|
||||
|
||||
// Performance test that measures Z3's actual hash function performance
|
||||
class Z3HashPerformanceTest {
|
||||
private:
|
||||
std::vector<std::string> test_data;
|
||||
std::mt19937 rng;
|
||||
|
||||
public:
|
||||
Z3HashPerformanceTest() : rng(42) {} // Fixed seed for reproducibility
|
||||
|
||||
void generate_z3_realistic_data() {
|
||||
test_data.clear();
|
||||
|
||||
// Generate data that represents realistic Z3 usage patterns
|
||||
|
||||
// 1. Variable names and identifiers (short strings)
|
||||
for (int i = 0; i < 20000; ++i) {
|
||||
std::string var = "var_" + std::to_string(i);
|
||||
test_data.push_back(var);
|
||||
}
|
||||
|
||||
// 2. SMT-LIB expressions (medium strings)
|
||||
for (int i = 0; i < 5000; ++i) {
|
||||
std::string expr = "(assert (and (> x_" + std::to_string(i) + " 0) (< y_" + std::to_string(i) + " 10)))";
|
||||
test_data.push_back(expr);
|
||||
}
|
||||
|
||||
// 3. Larger formula fragments
|
||||
for (int i = 0; i < 1000; ++i) {
|
||||
std::string formula = "(assert (or ";
|
||||
for (int j = 0; j < 10; ++j) {
|
||||
formula += "(= term_" + std::to_string(i * 10 + j) + " value_" + std::to_string(j) + ") ";
|
||||
}
|
||||
formula += "))";
|
||||
test_data.push_back(formula);
|
||||
}
|
||||
|
||||
// 4. Hash table keys (various lengths)
|
||||
std::uniform_int_distribution<> len_dist(8, 64);
|
||||
std::uniform_int_distribution<> char_dist(97, 122); // lowercase letters
|
||||
|
||||
for (int i = 0; i < 10000; ++i) {
|
||||
int len = len_dist(rng);
|
||||
std::string key;
|
||||
key.reserve(len);
|
||||
for (int j = 0; j < len; ++j) {
|
||||
key.push_back(static_cast<char>(char_dist(rng)));
|
||||
}
|
||||
test_data.push_back(key);
|
||||
}
|
||||
|
||||
std::cout << "Generated " << test_data.size() << " realistic Z3 hash test strings" << std::endl;
|
||||
}
|
||||
|
||||
double benchmark_z3_hash_performance(int iterations = 50) {
|
||||
auto start = std::chrono::high_resolution_clock::now();
|
||||
|
||||
volatile unsigned result = 0; // Prevent optimization
|
||||
for (int iter = 0; iter < iterations; ++iter) {
|
||||
for (const auto& str : test_data) {
|
||||
result += string_hash(str.c_str(), str.length(), 0);
|
||||
}
|
||||
}
|
||||
|
||||
auto end = std::chrono::high_resolution_clock::now();
|
||||
auto duration = std::chrono::duration_cast<std::chrono::microseconds>(end - start);
|
||||
|
||||
// Prevent dead code elimination
|
||||
if (result == 0xDEADBEEF) std::cout << "Impossible";
|
||||
|
||||
return duration.count() / 1000.0; // Return milliseconds
|
||||
}
|
||||
|
||||
void run_comprehensive_performance_test() {
|
||||
std::cout << "=== Z3 Hash Function Performance Analysis ===" << std::endl;
|
||||
std::cout << "Testing with realistic Z3 workload patterns" << std::endl;
|
||||
|
||||
generate_z3_realistic_data();
|
||||
|
||||
std::cout << "\n--- Performance Measurement (50 iterations) ---" << std::endl;
|
||||
double z3_time = benchmark_z3_hash_performance(50);
|
||||
|
||||
std::cout << std::fixed << std::setprecision(3);
|
||||
std::cout << "Z3 Hash Function: " << z3_time << " ms" << std::endl;
|
||||
|
||||
// Calculate throughput metrics
|
||||
size_t total_chars = 0;
|
||||
for (const auto& str : test_data) {
|
||||
total_chars += str.length();
|
||||
}
|
||||
|
||||
double chars_per_ms = (total_chars * 50) / z3_time;
|
||||
double mb_per_sec = (chars_per_ms * 1000) / (1024 * 1024);
|
||||
|
||||
std::cout << "Total characters processed: " << total_chars * 50 << std::endl;
|
||||
std::cout << "Throughput: " << chars_per_ms << " chars/ms" << std::endl;
|
||||
std::cout << "Throughput: " << mb_per_sec << " MB/sec" << std::endl;
|
||||
|
||||
// Hash quality verification (basic collision test)
|
||||
std::cout << "\n--- Hash Quality Verification ---" << std::endl;
|
||||
verify_hash_quality();
|
||||
}
|
||||
|
||||
void verify_hash_quality() {
|
||||
std::unordered_map<unsigned, int> hash_counts;
|
||||
int collisions = 0;
|
||||
|
||||
for (const auto& str : test_data) {
|
||||
unsigned hash_val = string_hash(str.c_str(), str.length(), 0);
|
||||
hash_counts[hash_val]++;
|
||||
if (hash_counts[hash_val] == 2) {
|
||||
collisions++;
|
||||
}
|
||||
}
|
||||
|
||||
double collision_rate = (100.0 * collisions) / test_data.size();
|
||||
std::cout << "Total strings: " << test_data.size() << std::endl;
|
||||
std::cout << "Unique hashes: " << hash_counts.size() << std::endl;
|
||||
std::cout << "Collisions: " << collisions << " (" << collision_rate << "%)" << std::endl;
|
||||
|
||||
if (collision_rate < 5.0) {
|
||||
std::cout << "✓ Hash quality: Good (< 5% collision rate)" << std::endl;
|
||||
} else {
|
||||
std::cout << "⚠ Hash quality: Needs attention (>= 5% collision rate)" << std::endl;
|
||||
}
|
||||
}
|
||||
};
|
||||
|
||||
// Build configuration info
|
||||
void print_build_info() {
|
||||
std::cout << "=== Z3 Hash Function Build Configuration ===" << std::endl;
|
||||
|
||||
#ifdef Z3_USE_XXHASH
|
||||
#if Z3_USE_XXHASH
|
||||
std::cout << "xxHash optimization: ENABLED" << std::endl;
|
||||
#else
|
||||
std::cout << "xxHash optimization: DISABLED" << std::endl;
|
||||
#endif
|
||||
#else
|
||||
std::cout << "xxHash optimization: NOT DEFINED (using default)" << std::endl;
|
||||
#endif
|
||||
|
||||
std::cout << "Compiler optimizations: " <<
|
||||
#ifdef NDEBUG
|
||||
"ENABLED (-DNDEBUG)"
|
||||
#else
|
||||
"DISABLED"
|
||||
#endif
|
||||
<< std::endl;
|
||||
}
|
||||
|
||||
int main() {
|
||||
print_build_info();
|
||||
|
||||
Z3HashPerformanceTest test;
|
||||
test.run_comprehensive_performance_test();
|
||||
|
||||
return 0;
|
||||
}
|
||||
Binary file not shown.
Loading…
Add table
Add a link
Reference in a new issue