| // Copyright 2023 The Bazel Authors. All rights reserved. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.devtools.build.lib.util; |
| |
| import static java.nio.charset.StandardCharsets.UTF_8; |
| |
| import com.google.auto.value.AutoValue; |
| import com.google.common.base.Splitter; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.flogger.GoogleLogger; |
| import java.io.BufferedReader; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.util.List; |
| |
| /** |
| * Helps to collect infomation about all process using ps command. Works for Linux and MacOS systems |
| */ |
| public final class PsInfoCollector { |
| private static final GoogleLogger logger = GoogleLogger.forEnclosingClass(); |
| |
| private PsInfoCollector() { |
| // prevent construction. |
| } |
| |
| /** Collects memory usage for every process. */ |
| public static ImmutableMap<Long, PsInfo> collectDataFromPs() { |
| try { |
| Process psProcess = buildPsProcess(); |
| return collectDataFromPsProcess(psProcess); |
| } catch (IOException e) { |
| logger.atWarning().withCause(e).log("Error while executing command ps"); |
| return ImmutableMap.of(); |
| } |
| } |
| |
| static ImmutableMap<Long, PsInfo> collectDataFromPsProcess(Process psProcess) { |
| BufferedReader psOutput = |
| new BufferedReader(new InputStreamReader(psProcess.getInputStream(), UTF_8)); |
| |
| ImmutableMap.Builder<Long, PsInfo> psInfos = ImmutableMap.builder(); |
| |
| try { |
| // The output of the above ps command looks similar to this: |
| // PID PPID RSS |
| // 211706 1 222972 |
| // 2612333 211706 6180 |
| // We skip over the first line (the header) and then parse the PID and the resident memory |
| // size in kilobytes. |
| String output = null; |
| boolean isFirst = true; |
| while ((output = psOutput.readLine()) != null) { |
| if (isFirst) { |
| isFirst = false; |
| continue; |
| } |
| List<String> line = Splitter.on(" ").trimResults().omitEmptyStrings().splitToList(output); |
| if (line.size() != 3) { |
| logger.atWarning().log("Unexpected length of split line %s %d", output, line.size()); |
| continue; |
| } |
| |
| long pid = Long.parseLong(line.get(0)); |
| long parentPid = Long.parseLong(line.get(1)); |
| int memoryInKb = Integer.parseInt(line.get(2)); |
| |
| psInfos.put(pid, PsInfo.create(pid, parentPid, memoryInKb)); |
| } |
| } catch (IllegalArgumentException | IOException e) { |
| logger.atWarning().withCause(e).log("Error while parsing psOutput: %s", psOutput); |
| } |
| |
| return psInfos.buildOrThrow(); |
| } |
| |
| private static Process buildPsProcess() throws IOException { |
| return new ProcessBuilder("ps", "-e", "-o", "pid,ppid,rss").start(); |
| } |
| |
| /** Parsed information about process collected after ps command call. */ |
| @AutoValue |
| public abstract static class PsInfo { |
| public abstract long getPid(); |
| |
| public abstract long getParentPid(); |
| |
| public abstract int getMemoryInKb(); |
| |
| public static PsInfo create(long pid, long parentPid, int memoryinKb) { |
| return new AutoValue_PsInfoCollector_PsInfo(pid, parentPid, memoryinKb); |
| } |
| } |
| } |