blocks|key|2204936|text|DDMS调试器通过套接字连接到Dalvik+VM。为了响应“起因GC”命令，它发送一个"HPGC“数据包(即HeaP+GC)，最终在core/java/android/ddm/DdmHandleHeap.java类的handleHPGC()方法中结束。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|2204937|handleHPGC()方法只是调用java.lang.Runtime.getRuntime().gc()方法。|2204938|我认为您可以使用Java+Debug+Wire+Protocol+(JDWP)编写一个简单的(？)程序，该程序将附加到您正在测试的应用程序的调试端口，并使用该API调用垃圾收集器。|2204939|作为Java+docs+say+for+java.lang.Runtime.gc()|2204940|2204941|+System.gc()方法是调用此方法的常规且方便的方法。|blockquote|2204942|2204943|entityMap|0|LINK|mutability|MUTABLE|url|http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#gc%2528%2529^0|1U|14|30|C|0|0|C|I|Z|0|0|K|M|2|14|0|0|0|1|B|0|0^^$0|@$1|2|3|4|5|6|7|Y|8|@$9|Z|A|10|B|C]|$9|11|A|12|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|18|8|@]|D|@]|E|$]]|$1|J|3|K|5|6|7|19|8|@$9|1A|A|1B|B|C]]|D|@$9|1C|A|1D|1|1E]]|E|$]]|$1|L|3|-4|5|6|7|1F|8|@]|D|@]|E|$]]|$1|M|3|N|5|O|7|1G|8|@$9|1H|A|1I|B|C]]|D|@]|E|$]]|$1|P|3|-4|5|6|7|1J|8|@]|D|@]|E|$]]|$1|Q|3|-4|5|6|7|1K|8|@]|D|@]|E|$]]]|R|$S|$5|T|U|V|E|$W|X]]]]

The DDMS debugger connects to the Dalvik VM over a socket. In response to a "Cause GC" command, it sends a "HPGC" packet (ie., HeaP GC), which ends up in the <code>handleHPGC()</code> method of the <code>core/java/android/ddm/DdmHandleHeap.java</code> class. 

The <code>handleHPGC()</code> method simply calls the <code>java.lang.Runtime.getRuntime().gc()</code> method.

I think you could use the Java Debug Wire Protocol (JDWP) to write a simple (??? - I've never done this, so it might not be all that simple) program that will attach to the debug port for the application you're testing and invoke the garbage collector using that API.

As the <a href="http://docs.oracle.com/javase/7/docs/api/java/lang/Runtime.html#gc%28%29" rel="nofollow">Java docs say for <code>java.lang.Runtime.gc()</code></a>:

<blockquote>
 The method <code>System.gc()</code> is the conventional and convenient means of invoking this method.
</blockquote>

blocks|key|5279432|text|在android+studio中，您可以使用Profiler工具。只需在分析器上添加您的应用程序会话，然后单击Memory+sections。然后按标题上的强制GC按钮(用回收站图标表示)|type|unstyled|depth|inlineStyleRanges|entityRanges|data|5279433|​|5279434|📷|atomic|offset|length|5279435|5279436|entityMap|0|IMAGE|mutability|IMMUTABLE|imageUrl|https://ask.qcloudimg.com/http-save/yehe-900000/60eaadda3a7d25fc0605248a7bde6f56.png|imageAlt^0|0|0|0|1|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@]|9|@$G|V|H|W|1|X]]|A|$]]|$1|I|3|C|5|6|7|Y|8|@]|9|@]|A|$]]|$1|J|3|-4|5|6|7|Z|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|Q|R|-4]]]]

From android studio, you can use Profiler tools.
Simply add your app session on the profiler and click on Memory sections. then press the Force GC button on the header (indicated with Trash icon)

<a href="https://i.stack.imgur.com/PZeSv.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/PZeSv.png" alt="Profiler Force GC"></a>

blocks|key|291779|text|DDMS中原因GC的定义为:-|type|unstyled|depth|inlineStyleRanges|entityRanges|data|291780|291781|在“堆”选项卡上，单击“引起GC调用垃圾收集”，这将启用堆数据的收集。操作完成后，您将看到一组对象类型以及为每种类型分配的内存。您可以再次单击原因GC以刷新数据。|blockquote|291782|291783|291784|这就是所谓的GC_EXPLICIT|291785|使用Debug.dumpHprofData(字符串)生成堆转储。|291786|291787|将"hprof“数据转储到指定文件。这可能会导致GC。|291788|291789|entityMap^0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|S|8|@]|9|@]|A|$]]|$1|C|3|D|5|E|7|T|8|@]|9|@]|A|$]]|$1|F|3|-4|5|6|7|U|8|@]|9|@]|A|$]]|$1|G|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|X|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]|$1|M|3|N|5|E|7|Z|8|@]|9|@]|A|$]]|$1|O|3|-4|5|6|7|10|8|@]|9|@]|A|$]]|$1|P|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|Q|$]]

Definition of Cause GC in DDMS is :- 

<blockquote>
 In the Heap tab, click Cause GC to invoke garbage collection, which
 enables the collection of heap data. When the operation completes, you
 will see a group of object types and the memory that has been
 allocated for each type. You can click Cause GC again to refresh the
 data.
</blockquote>

This is known as GC_EXPLICIT

Use Debug.dumpHprofData(String) to generate a heap dump.

<blockquote>
 Dump "hprof" data to the specified file. This may cause a GC.
</blockquote>

blocks|key|3168278|text|kill+-10+pid|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3168279|来自：https://github.com/TencentOpen/GT/blob/master/android/src/com/tencent/wstt/gt/proInfo/floatView/GTMemHelperFloatview.java|offset|length|3168280|private+void+gc()+{
++++String+pid+=+String.valueOf(ProcessUtils
++++++++++++.getProcessPID(AUTManager.pkn.toString()));

++++if+(!pid.equals("-1"))+{
++++++++boolean+isSucess+=+true;
++++++++ProcessBuilder+pb+=+null;

++++++++String+cmd+=+"kill+-10+"+%2B+pid;
++++++++pb+=+new+ProcessBuilder("su",+"-c",+cmd);

++++++++Process+exec+=+null;

++++++++pb.redirectErrorStream(true);
++++++++try+{
++++++++++++exec+=+pb.start();

++++++++++++InputStream+is+=+exec.getInputStream();
++++++++++++BufferedReader+reader+=+new+BufferedReader(
++++++++++++++++++++new+InputStreamReader(is));

++++++++++++while+((reader.readLine())+!=+null)+{
++++++++++++++++isSucess+=+false;
++++++++++++}
++++++++}+catch+(Exception+e)+{
++++++++++++e.printStackTrace();
++++++++++++isSucess+=+false;
++++++++}
++++++++//+至此命令算是执行成功
++++++++if+(isSucess)
++++++++{
++++++++++++handler.sendEmptyMessage(5);
++++++++}

++++}+else+{
++++++++Log.d("gc+error",+"pid+not+found!");
++++}
}|code-block|syntax|javascript|3168281|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/TencentOpen/GT/blob/master/android/src/com/tencent/wstt/gt/proInfo/floatView/GTMemHelperFloatview.java^0|0|3|3D|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@$D|U|E|V|1|W]]|A|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|A|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|A|$]]]|L|$M|$5|N|O|P|A|$Q|R]]]]

kill -10 pid

from:<a href="https://github.com/TencentOpen/GT/blob/master/android/src/com/tencent/wstt/gt/proInfo/floatView/GTMemHelperFloatview.java" rel="nofollow noreferrer">https://github.com/TencentOpen/GT/blob/master/android/src/com/tencent/wstt/gt/proInfo/floatView/GTMemHelperFloatview.java</a>

<pre><code>private void gc() {
 String pid = String.valueOf(ProcessUtils
 .getProcessPID(AUTManager.pkn.toString()));

 if (!pid.equals("-1")) {
 boolean isSucess = true;
 ProcessBuilder pb = null;

 String cmd = "kill -10 " + pid;
 pb = new ProcessBuilder("su", "-c", cmd);

 Process exec = null;

 pb.redirectErrorStream(true);
 try {
 exec = pb.start();

 InputStream is = exec.getInputStream();
 BufferedReader reader = new BufferedReader(
 new InputStreamReader(is));

 while ((reader.readLine()) != null) {
 isSucess = false;
 }
 } catch (Exception e) {
 e.printStackTrace();
 isSucess = false;
 }
 // 至此命令算是执行成功
 if (isSucess)
 {
 handler.sendEmptyMessage(5);
 }

 } else {
 Log.d("gc error", "pid not found!");
 }
}
</code></pre>

blocks|key|3168320|text|我也遇到过同样的情况，在寻找活动的内存泄漏之前，我需要确保执行GC。我没有得到一个直接的解决方案或任何可以调用GC的adb命令。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3168321|下面的变通方法对我有效。|3168322|我在正在调试的应用程序中注册了一个带有自定义Action的简单广播接收器。在onReceive方法中，我编写了System.gc()方法。然后用简单的adb命令adb+shell+am+broadcast+-a+INTENT_ACTION_NAME_HERE广播一个意图。|offset|length|style|CODE|3168323|我知道现在已经很晚了，但还是有人会觉得这很有用。|3168324|entityMap^0|0|0|12|9|1J|B|28|1D|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|P|8|@$F|Q|G|R|H|I]|$F|S|G|T|H|I]|$F|U|G|V|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|W|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|X|8|@]|9|@]|A|$]]]|M|$]]

I had a same situation, wherein I needed to ensure that GC is performed before I go looking for memory leaks for an Activity. I didn't get a direct solution or any adb command that could invoke GC.

Following workaround worked for me.

I registered a simple broadcast receiver with a custom Action inside the application I was debugging. Inside <code>onReceive</code> method I wrote <code>System.gc()</code> method. Then broadcast an intent with simple adb command <code>adb shell am broadcast -a INTENT_ACTION_NAME_HERE</code>.

I know it's very late now, still someone might find this useful.

blocks|key|3168255|text|adb+shell+am+dumpheap+com.test.test+/sdcard/test.hprof|type|code-block|depth|inlineStyleRanges|entityRanges|data|syntax|javascript|3168256|unstyled|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|G|8|@]|9|@]|A|$B|C]]|$1|D|3|-4|5|E|7|H|8|@]|9|@]|A|$]]]|F|$]]

<pre><code>adb shell am dumpheap com.test.test /sdcard/test.hprof
</code></pre>

I want to test android apps' memory performance, and I want to get memory information automaticaly. I use 'adb shell dumpsys meminfo ...' to get memory infomation periodicaly.
Now, I want to observe memory leak, how can I excute gc ? Just like "Cause GC" in DDMS.
Thanks!

How can I invoke GC using adb tools?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我想测试android应用程序的内存性能，我想自动获取内存信息。我使用'adb shell dumpsys meminfo...‘定期获取内存信息。现在，我想观察内存泄漏，如何执行gc？就像DDMS中的“原因GC”一样。谢谢!

问如何使用adb工具调用GC？
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回答 6

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