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83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
// Copyright 2012 Cloudera Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "util/parse-util.h"
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#include "util/mem-info.h"
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#include "util/string-parser.h"
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using namespace std;
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namespace impala {
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int64_t ParseUtil::ParseMemSpec(const string& mem_spec_str, bool* is_percent) {
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if (mem_spec_str.empty()) return 0;
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// Assume last character indicates unit or percent.
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int32_t number_str_len = mem_spec_str.size() - 1;
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*is_percent = false;
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int64_t multiplier = -1;
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// Look for accepted suffix character.
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switch (*mem_spec_str.rbegin()) {
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case 'g':
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case 'G':
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// Gigabytes.
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multiplier = 1024L * 1024L * 1024L;
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break;
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case '%':
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*is_percent = true;
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break;
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case 'm':
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case 'M':
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// Megabytes.
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multiplier = 1024L * 1024L;
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break;
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case 'b':
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case 'B':
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break;
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default:
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// No unit was given. Default to bytes.
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number_str_len = mem_spec_str.size();
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break;
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}
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StringParser::ParseResult result;
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int64_t bytes;
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if (multiplier != -1) {
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// Parse float - MB or GB
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double limit_val = StringParser::StringToFloat<double>(mem_spec_str.data(),
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number_str_len, &result);
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if (result != StringParser::PARSE_SUCCESS) return -1;
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bytes = multiplier * limit_val;
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} else {
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// Parse int - bytes or percent
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int64_t limit_val = StringParser::StringToInt<int64_t>(mem_spec_str.data(),
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number_str_len, &result);
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if (result != StringParser::PARSE_SUCCESS) return -1;
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if (*is_percent) {
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bytes =
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(static_cast<double>(limit_val) / 100.0) * MemInfo::physical_mem();
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} else {
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bytes = limit_val;
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}
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}
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// Accept -1 as indicator for infinite memory that we report by a 0 return value.
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if (bytes == -1) {
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return 0;
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}
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return bytes;
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}
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}
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