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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/db/query/util/memory_util.h"
#include "mongo/logv2/log.h"
#include "mongo/util/pcre.h"
#include "mongo/util/processinfo.h"
#include <cstddef>
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo::memory_util {
StatusWith<MemoryUnits> parseUnitString(const std::string& strUnit) {
if (strUnit.empty()) {
return Status(ErrorCodes::Error{6007010}, "Unit value cannot be empty");
}
if (strUnit[0] == '%') {
return MemoryUnits::kPercent;
} else if (strUnit[0] == 'M' || strUnit[0] == 'm') {
return MemoryUnits::kMB;
} else if (strUnit[0] == 'G' || strUnit[0] == 'g') {
return MemoryUnits::kGB;
}
return Status(ErrorCodes::Error{6007011}, "Incorrect unit value");
}
StatusWith<MemorySize> MemorySize::parse(const std::string& str) {
// Looks for a floating point number with followed by a unit suffix (MB, GB, %).
static auto& re = *new pcre::Regex(R"re((?i)^\s*(\d+\.?\d*)\s*(MB|GB|%)\s*$)re");
auto m = re.matchView(str);
if (!m) {
return {ErrorCodes::Error{6007012}, "Unable to parse memory size string"};
}
double size = std::stod(std::string{m[1]});
std::string strUnit{m[2]};
auto statusWithUnit = parseUnitString(strUnit);
if (!statusWithUnit.isOK()) {
return statusWithUnit.getStatus();
}
return MemorySize{size, statusWithUnit.getValue()};
}
size_t convertToSizeInBytes(const MemorySize& memSize) {
constexpr size_t kBytesInMB = 1024 * 1024;
constexpr size_t kMBytesInGB = 1024;
double sizeInMB = memSize.size;
switch (memSize.units) {
case MemoryUnits::kPercent:
sizeInMB *= ProcessInfo::getMemSizeMB() / 100.0;
break;
case MemoryUnits::kMB:
break;
case MemoryUnits::kGB:
sizeInMB *= kMBytesInGB;
break;
}
return static_cast<size_t>(sizeInMB * kBytesInMB);
}
size_t getRequestedMemSizeInBytes(const MemorySize& memSize) {
size_t planCacheSize = convertToSizeInBytes(memSize);
uassert(5968001,
"Cache size must be at least 1KB * number of cores",
planCacheSize >= 1024 * ProcessInfo::getNumCores());
return planCacheSize;
}
/**
* Sets upper limit on a storage structure's size. Either that structure's maximumSize or to
* percentage of the total system's memory (both known at call site), whichever is smaller.
*/
size_t capMemorySize(size_t requestedSizeBytes,
size_t maximumSizeGB,
double percentTotalSystemMemory) {
constexpr size_t kBytesInGB = 1024 * 1024 * 1024;
// Express maximum size in bytes.
const size_t maximumSizeBytes = maximumSizeGB * kBytesInGB;
const memory_util::MemorySize limitToProcessSize{percentTotalSystemMemory,
memory_util::MemoryUnits::kPercent};
const size_t limitToProcessSizeInBytes = convertToSizeInBytes(limitToProcessSize);
// The size will be capped by the minimum of the two values defined above.
const size_t upperLimit = std::min(maximumSizeBytes, limitToProcessSizeInBytes);
if (requestedSizeBytes > upperLimit) {
requestedSizeBytes = upperLimit;
}
return requestedSizeBytes;
}
} // namespace mongo::memory_util
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