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// Copyright 2014 Google Inc. 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.actions;
import com.google.common.annotations.VisibleForTesting;
import com.google.common.base.Splitter;
import com.google.common.io.Files;
import com.google.devtools.build.lib.concurrent.ThreadSafety.ThreadCompatible;
import com.google.devtools.build.lib.util.ProcMeminfoParser;
import java.io.File;
import java.io.IOException;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.Set;
/**
* This class estimates the local host's resource capacity.
*/
@ThreadCompatible
public final class LocalHostCapacity {
/* If /proc/* information is not available, guess based on what the JVM thinks. Anecdotally,
* the JVM picks 0.22 the total available memory as maxMemory (tested on a standard Mac), so
* multiply by 3, and divide by 2^20 because we want megabytes.
*/
private static final ResourceSet DEFAULT_RESOURCES = ResourceSet.create(
3.0 * (Runtime.getRuntime().maxMemory() >> 20),
Runtime.getRuntime().availableProcessors(), 1.0,
Integer.MAX_VALUE);
private LocalHostCapacity() {}
/**
* Estimates of the local host's resource capacity,
* obtained by reading /proc/cpuinfo and /proc/meminfo.
*/
private static ResourceSet localHostCapacity;
/**
* Estimates of the local host's resource capacity,
* obtained by reading /proc/cpuinfo and /proc/meminfo.
*/
public static ResourceSet getLocalHostCapacity() {
if (localHostCapacity == null) {
localHostCapacity = getLocalHostCapacity("/proc/cpuinfo", "/proc/meminfo");
}
return localHostCapacity;
}
private static final Splitter NEWLINE_SPLITTER = Splitter.on('\n').omitEmptyStrings();
@VisibleForTesting
static int getLogicalCpuCount(String cpuinfoContent) {
Iterable<String> lines = NEWLINE_SPLITTER.split(cpuinfoContent);
int count = 0;
for (String line : lines) {
if(line.startsWith("processor")) {
count++;
}
}
if (count == 0) {
throw new IllegalArgumentException("Can't locate processor in the /proc/cpuinfo");
}
return count;
}
@VisibleForTesting
static int getPhysicalCpuCount(String cpuinfoContent, int logicalCpuCount) {
Iterable<String> lines = NEWLINE_SPLITTER.split(cpuinfoContent);
Set<String> uniq = new HashSet<>();
for (String line : lines) {
if(line.startsWith("physical id")) {
uniq.add(line);
}
}
int physicalCpuCount = uniq.size();
if (physicalCpuCount == 0) {
physicalCpuCount = logicalCpuCount;
}
return physicalCpuCount;
}
@VisibleForTesting
static int getCoresPerCpu(String cpuinfoFileContent) {
Iterable<String> lines = NEWLINE_SPLITTER.split(cpuinfoFileContent);
Set<String> uniq = new HashSet<>();
for (String line : lines) {
if(line.startsWith("core id")) {
uniq.add(line);
}
}
int coresPerCpu = uniq.size();
if (coresPerCpu == 0) {
coresPerCpu = 1;
}
return coresPerCpu;
}
@VisibleForTesting
static ResourceSet getLocalHostCapacity(String cpuinfoFile, String meminfoFile) {
try {
String cpuinfoContent = readContent(cpuinfoFile);
ProcMeminfoParser memInfo = new ProcMeminfoParser(meminfoFile);
int logicalCpuCount = getLogicalCpuCount(cpuinfoContent);
int physicalCpuCount = getPhysicalCpuCount(cpuinfoContent, logicalCpuCount);
int coresPerCpu = getCoresPerCpu(cpuinfoContent);
int totalCores = coresPerCpu * physicalCpuCount;
boolean hyperthreading = (logicalCpuCount != totalCores);
double ramMb = ProcMeminfoParser.kbToMb(memInfo.getTotalKb());
final double EFFECTIVE_CPUS_PER_HYPERTHREADED_CPU = 0.6;
return ResourceSet.create(
ramMb,
logicalCpuCount * (hyperthreading ? EFFECTIVE_CPUS_PER_HYPERTHREADED_CPU : 1.0),
1.0,
Integer.MAX_VALUE);
} catch (IOException | IllegalArgumentException e) {
return DEFAULT_RESOURCES;
}
}
/**
* For testing purposes only. Do not use it.
*/
@VisibleForTesting
static void setLocalHostCapacity(ResourceSet resources) {
localHostCapacity = resources;
}
private static String readContent(String filename) throws IOException {
return Files.toString(new File(filename), Charset.defaultCharset());
}
}
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