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Make CPU cache interrogation an opt-in feature #389

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Jan 23, 2025
Merged

Make CPU cache interrogation an opt-in feature #389

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147 changes: 79 additions & 68 deletions cpu/src/main/java/io/smallrye/common/cpu/CacheInfo.java
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Original file line number Diff line number Diff line change
Expand Up @@ -78,84 +78,95 @@ public static int getSmallestInstructionCacheLineSize() {
}

static {
cacheLevels = doPrivileged((PrivilegedAction<CacheLevelInfo[]>) () -> {
try {
String osArch = System.getProperty("os.name", "unknown").toLowerCase(Locale.US);
if (osArch.contains("linux")) {
// try to read /sys fs
final File cpu0 = new File("/sys/devices/system/cpu/cpu0/cache");
if (cpu0.exists()) {
// great!
final File[] files = cpu0.listFiles();
if (files != null) {
ArrayList<File> indexes = new ArrayList<File>();
for (File file : files) {
if (file.getName().startsWith("index")) {
indexes.add(file);
cacheLevels = doPrivileged(new PrivilegedAction<>() {
@Override
public CacheLevelInfo[] run() {
if (determineCacheLevel()) {
try {
String osArch = System.getProperty("os.name", "unknown").toLowerCase(Locale.US);
if (osArch.contains("linux")) {
// try to read /sys fs
final File cpu0 = new File("/sys/devices/system/cpu/cpu0/cache");
if (cpu0.exists()) {
// great!
final File[] files = cpu0.listFiles();
if (files != null) {
ArrayList<File> indexes = new ArrayList<File>();
for (File file : files) {
if (file.getName().startsWith("index")) {
indexes.add(file);
}
}
final CacheLevelInfo[] levelInfoArray = new CacheLevelInfo[indexes.size()];
for (int i = 0; i < indexes.size(); i++) {
File file = indexes.get(i);
int index = parseIntFile(new File(file, "level"));
final CacheType type;
switch (parseStringFile(new File(file, "type"))) {
case "Data":
type = CacheType.DATA;
break;
case "Instruction":
type = CacheType.INSTRUCTION;
break;
case "Unified":
type = CacheType.UNIFIED;
break;
default:
type = CacheType.UNKNOWN;
break;
}
int size = parseIntKBFile(new File(file, "size"));
int lineSize = parseIntFile(new File(file, "coherency_line_size"));
levelInfoArray[i] = new CacheLevelInfo(index, type, size, lineSize);
}
return levelInfoArray;
}
}
final CacheLevelInfo[] levelInfoArray = new CacheLevelInfo[indexes.size()];
for (int i = 0; i < indexes.size(); i++) {
File file = indexes.get(i);
int index = parseIntFile(new File(file, "level"));
final CacheType type;
switch (parseStringFile(new File(file, "type"))) {
case "Data":
type = CacheType.DATA;
break;
case "Instruction":
type = CacheType.INSTRUCTION;
break;
case "Unified":
type = CacheType.UNIFIED;
break;
default:
type = CacheType.UNKNOWN;
break;
} else if (osArch.contains("mac os x")) {
// cache line size
final int lineSize = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.cachelinesize"));
if (lineSize != 0) {
// cache sizes
final int l1d = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l1dcachesize"));
final int l1i = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l1icachesize"));
final int l2 = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l2cachesize"));
final int l3 = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l3cachesize"));
ArrayList<CacheLevelInfo> list = new ArrayList<CacheLevelInfo>();
if (l1d != 0) {
list.add(new CacheLevelInfo(1, CacheType.DATA, l1d / 1024, lineSize));
}
if (l1i != 0) {
list.add(new CacheLevelInfo(1, CacheType.INSTRUCTION, l1i / 1024, lineSize));
}
if (l2 != 0) {
list.add(new CacheLevelInfo(2, CacheType.UNIFIED, l2 / 1024, lineSize));
}
if (l3 != 0) {
list.add(new CacheLevelInfo(3, CacheType.UNIFIED, l3 / 1024, lineSize));
}
if (list.size() > 0) {
return list.toArray(new CacheLevelInfo[list.size()]);
}
int size = parseIntKBFile(new File(file, "size"));
int lineSize = parseIntFile(new File(file, "coherency_line_size"));
levelInfoArray[i] = new CacheLevelInfo(index, type, size, lineSize);
}
return levelInfoArray;
} else if (osArch.contains("windows")) {
// TODO: use the wmic utility to get cache line info
}
} catch (Throwable ignored) {
}
} else if (osArch.contains("mac os x")) {
// cache line size
final int lineSize = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.cachelinesize"));
if (lineSize != 0) {
// cache sizes
final int l1d = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l1dcachesize"));
final int l1i = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l1icachesize"));
final int l2 = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l2cachesize"));
final int l3 = safeParseInt(parseProcessOutput("/usr/sbin/sysctl", "-n", "hw.l3cachesize"));
ArrayList<CacheLevelInfo> list = new ArrayList<CacheLevelInfo>();
if (l1d != 0) {
list.add(new CacheLevelInfo(1, CacheType.DATA, l1d / 1024, lineSize));
}
if (l1i != 0) {
list.add(new CacheLevelInfo(1, CacheType.INSTRUCTION, l1i / 1024, lineSize));
}
if (l2 != 0) {
list.add(new CacheLevelInfo(2, CacheType.UNIFIED, l2 / 1024, lineSize));
}
if (l3 != 0) {
list.add(new CacheLevelInfo(3, CacheType.UNIFIED, l3 / 1024, lineSize));
}
if (list.size() > 0) {
return list.toArray(new CacheLevelInfo[list.size()]);
}
}
} else if (osArch.contains("windows")) {
// TODO: use the wmic utility to get cache line info
// all has failed
return new CacheLevelInfo[0];
} else {
return new CacheLevelInfo[] { new CacheLevelInfo(0, CacheType.UNKNOWN, 0, 64) };
}
} catch (Throwable ignored) {
}
// all has failed
return new CacheLevelInfo[0];
});
}

private static boolean determineCacheLevel() {
return Boolean.parseBoolean(System.getProperty("smallrye.cpu.determine-cache-level", "false"));
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}

static int parseIntFile(final File file) {
return safeParseInt(parseStringFile(file));
}
Expand Down Expand Up @@ -278,4 +289,4 @@ public static void main(String[] args) {
Integer.valueOf(levelInfo.getCacheLineSize()));
}
}
}
}
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