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perf(hash): Hash caching

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added ability for composition to stash their own hash values
This commit is contained in:
Emily Boudreaux
2025-12-07 07:47:32 -05:00
parent 9541234a5f
commit 75ba6c8456
5 changed files with 51 additions and 1 deletions
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33
tests/composition/compositionTest.cpp
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@@ -2,6 +2,7 @@
#include <stdexcept>
#include <string>
#include <algorithm>
#include <chrono>
#include "fourdst/atomic/atomicSpecies.h"
#include "fourdst/atomic/species.h"
@@ -439,3 +440,35 @@ TEST_F(compositionTest, canonicalizeNaNIfAllowed) {
ASSERT_EQ(fourdst::composition::utils::CompositionHash::hash_exact(a),
fourdst::composition::utils::CompositionHash::hash_exact(b));
}
TEST_F(compositionTest, hash) {
fourdst::composition::Composition a, b;
a.registerSymbol("H-1"); b.registerSymbol("H-1");
a.setMolarAbundance("H-1", 0.6); b.setMolarAbundance("H-1", 0.6);
EXPECT_NO_THROW((void)a.hash());
EXPECT_EQ(a.hash(), b.hash());
}
TEST_F(compositionTest, hashCaching) {
using namespace fourdst::atomic;
std::unordered_map<Species, double> abundances ={
{H_1, 0.702},
{He_4, 0.06},
{C_12, 0.001},
{N_14, 0.0005},
{O_16, 0.22},
};
fourdst::composition::Composition a(abundances);
const auto first_hash_clock_start = std::chrono::high_resolution_clock::now();
(void)a.hash();
const auto first_hash_clock_end = std::chrono::high_resolution_clock::now();
const auto first_hash_duration = std::chrono::duration_cast<std::chrono::nanoseconds>(first_hash_clock_end - first_hash_clock_start).count();
const auto second_hash_clock_start = std::chrono::high_resolution_clock::now();
(void)a.hash();
const auto second_hash_clock_end = std::chrono::high_resolution_clock::now();
const auto second_hash_duration = std::chrono::duration_cast<std::chrono::nanoseconds>(second_hash_clock_end - second_hash_clock_start).count();
EXPECT_LT(second_hash_duration, first_hash_duration);
}