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Better cache for symbolizeAddress function

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This commit is contained in:
Alexey Milovidov 2019-07-24 03:47:17 +03:00
parent 378fff2990
commit 36746d85dd
2 changed files with 32 additions and 25 deletions
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49
dbms/src/Functions/symbolizeAddress.cpp
View File

@ -3,6 +3,7 @@
#include <optional>
#include <common/unaligned.h>
#include <common/demangle.h>
#include <common/SimpleCache.h>
#include <Columns/ColumnString.h>
#include <Columns/ColumnsNumber.h>
#include <DataTypes/DataTypeString.h>
@ -62,6 +63,23 @@ public:
return true;
}
static std::string addressToSymbol(UInt64 uint_address)
{
void * addr = unalignedLoad<void *>(&uint_address);
/// This is extremely slow.
Dl_info info;
if (dladdr(addr, &info) && info.dli_sname)
{
int demangling_status = 0;
return demangle(info.dli_sname, demangling_status);
}
else
{
return {};
}
}
void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result, size_t input_rows_count) override
{
const ColumnPtr & column = block.getByPosition(arguments[0]).column;
@ -73,36 +91,19 @@ public:
const typename ColumnVector<UInt64>::Container & data = column_concrete->getData();
auto result_column = ColumnString::create();
std::unordered_map<void *, std::string> cache;
static SimpleCache<decltype(addressToSymbol), &addressToSymbol> func_cached;
for (size_t i = 0; i < input_rows_count; ++i)
{
void * addr = unalignedLoad<void *>(&data[i]);
if (auto it = cache.find(addr); it != cache.end())
{
result_column->insertDataWithTerminatingZero(it->second.data(), it->second.size() + 1);
}
else
{
/// This is extremely slow.
Dl_info info;
if (dladdr(addr, &info) && info.dli_sname)
{
int demangling_status = 0;
std::string demangled_name = demangle(info.dli_sname, demangling_status);
result_column->insertDataWithTerminatingZero(demangled_name.data(), demangled_name.size() + 1);
cache.emplace(addr, demangled_name);
}
else
{
cache.emplace(addr, std::string());
result_column->insertDefault();
}
}
std::string symbol = func_cached(data[i]);
result_column->insertDataWithTerminatingZero(symbol.data(), symbol.size() + 1);
}
block.getByPosition(result).column = std::move(result_column);
/// Do not let our cache to grow indefinitely (simply drop it)
if (func_cached.size() > 1000000)
func_cached.drop();
}
};

8
libs/libcommon/include/common/SimpleCache.h
View File

@ -26,7 +26,7 @@ private:
using Result = typename function_traits<F>::result;
std::map<Key, Result> cache;
std::mutex mutex;
mutable std::mutex mutex;
public:
template <typename... Args>
@ -66,6 +66,12 @@ public:
}
}
size_t size() const
{
std::lock_guard lock(mutex);
return cache.size();
}
void drop()
{
std::lock_guard lock(mutex);