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STVar: optimized storage for STObject (RIPD-825):

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This introduces the STVar container, capable of holding any STBase-derived
class and implementing a "small string" optimization. STObject is changed
to store std::vector<STVar> instead of boost::ptr_vector<STBase>. This
eliminates a significant number of needless dynamic memory allocations and
deallocations during transaction processing when ledger entries are
deserialized. It comes at the expense of larger overall storage requirements
for STObject.
This commit is contained in:
Vinnie Falco
2015-03-19 16:17:35 -07:00
parent 4c5308da8d
commit 99c2fac143
30 changed files with 956 additions and 748 deletions
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23
src/ripple/protocol/impl/STVector256.cpp
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@@ -25,31 +25,22 @@
namespace ripple {
std::unique_ptr<STBase>
STVector256::deserialize (SerialIter& sit, SField::ref name)
STVector256::STVector256(SerialIter& sit, SField::ref name)
: STBase(name)
{
auto vec = std::make_unique<STVector256> (name);
Blob data = sit.getVL ();
auto const count = data.size () / (256 / 8);
vec->mValue.reserve (count);
mValue.reserve (count);
Blob::iterator begin = data.begin ();
unsigned int uStart = 0;
for (unsigned int i = 0; i != count; i++)
{
unsigned int uEnd = uStart + (256 / 8);
// This next line could be optimized to construct a default uint256
// in the vector and then copy into it
vec->mValue.push_back (uint256 (Blob (begin + uStart, begin + uEnd)));
unsigned int uEnd = uStart + (256 / 8);
// This next line could be optimized to construct a default
// uint256 in the vector and then copy into it
mValue.push_back (uint256 (Blob (begin + uStart, begin + uEnd)));
uStart = uEnd;
}
return std::move (vec);
}
void