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DroidFish: Run the engine process with lower priority.

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This commit is contained in:
Peter Osterlund 2015-10-24 00:11:21 +02:00
parent 0d72a21f27
commit a95dacafdf
3 changed files with 29 additions and 2 deletions
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16
DroidFish/jni/nativeutil.cpp
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@ -20,6 +20,8 @@
#include <unistd.h> #include <unistd.h>
#include <stdlib.h> #include <stdlib.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/time.h>
#include <sys/resource.h>
/* /*
* Class: org_petero_droidfish_engine_EngineUtil * Class: org_petero_droidfish_engine_EngineUtil
@ -27,8 +29,7 @@
* Signature: (Ljava/lang/String;)Z * Signature: (Ljava/lang/String;)Z
*/ */
extern "C" JNIEXPORT jboolean JNICALL Java_org_petero_droidfish_engine_EngineUtil_chmod extern "C" JNIEXPORT jboolean JNICALL Java_org_petero_droidfish_engine_EngineUtil_chmod
(JNIEnv *env, jclass, jstring jExePath) (JNIEnv *env, jclass, jstring jExePath) {
{
const char* exePath = (*env).GetStringUTFChars(jExePath, NULL); const char* exePath = (*env).GetStringUTFChars(jExePath, NULL);
if (!exePath) if (!exePath)
return false; return false;
@ -36,3 +37,14 @@ extern "C" JNIEXPORT jboolean JNICALL Java_org_petero_droidfish_engine_EngineUti
(*env).ReleaseStringUTFChars(jExePath, exePath); (*env).ReleaseStringUTFChars(jExePath, exePath);
return ret; return ret;
} }
/*
* Class: org_petero_droidfish_engine_EngineUtil
* Method: reNice
* Signature: (II)V
*/
extern "C" JNIEXPORT void JNICALL Java_org_petero_droidfish_engine_EngineUtil_reNice
(JNIEnv *env, jclass, jint pid, jint prio) {
setpriority(PRIO_PROCESS, pid, prio);
}

3
DroidFish/src/org/petero/droidfish/engine/EngineUtil.java
View File

@ -107,6 +107,9 @@ public class EngineUtil {
/** Executes chmod 744 exePath. */ /** Executes chmod 744 exePath. */
final static native boolean chmod(String exePath); final static native boolean chmod(String exePath);
/** Change the priority of a process. */
final static native void reNice(int pid, int prio);
/** For synchronizing non thread safe native calls. */ /** For synchronizing non thread safe native calls. */
public static Object nativeLock = new Object(); public static Object nativeLock = new Object();
} }

12
DroidFish/src/org/petero/droidfish/engine/ExternalEngine.java
View File

@ -77,6 +77,7 @@ public class ExternalEngine extends UCIEngineBase {
synchronized (EngineUtil.nativeLock) { synchronized (EngineUtil.nativeLock) {
engineProc = pb.start(); engineProc = pb.start();
} }
reNice(engineProc);
startupThread = new Thread(new Runnable() { startupThread = new Thread(new Runnable() {
@Override @Override
@ -168,6 +169,17 @@ public class ExternalEngine extends UCIEngineBase {
} }
} }
/** Try to change the engine process priority to 5. */
private void reNice(Process proc) {
try {
java.lang.reflect.Field f = engineProc.getClass().getDeclaredField("pid");
f.setAccessible(true);
int pid = f.getInt(engineProc);
EngineUtil.reNice(pid, 10);
} catch (Throwable t) {
}
}
/** Remove all files except exePath from exeDir. */ /** Remove all files except exePath from exeDir. */
private void cleanUpExeDir(File exeDir, String exePath) { private void cleanUpExeDir(File exeDir, String exePath) {
try { try {