使用HttpClient和Apache服务器运行带有Memcache的php脚本的Android性能

我有一个应用程序，其中Android设备连接到数据采集系统，数据存储在本地数据库中。我想在第二个安卓系统上实时监控数据。为了提高性能，我在Windows机器上设置了自己的Apache服务器（XAMPP）。我写了两个php脚本；一个用于将数据存储在Memcache中，另一个用于从Memcache获取数据。Android设备正在使用HttpClient来调用脚本。我使用memcache是为了消除写入数据库时的一些延迟。以下是用于发送和接收数据的代码。。。对于测试，它是一个带有线程延迟的简单循环（计数器）。如果我将延迟设置为1秒，则文本视图将更新并平稳运行。当我将延迟降低到0.1秒时，它会运行几秒钟，然后断断续续（停顿）3-5秒。它继续这种在运行时间歇性暂停的过程。如果我把延迟降低到0.01秒，系统就会崩溃。我的Apache服务器直接连接到我的路由器。安卓设备已连接到我的WiFi。我的问题是我是否在做一些根本错误的事情。我认为有了memcache，我就可以轻松地对数据进行0.01秒的采样。我的代码是否正确处理AsyncTasks？如何防止安卓系统明显被新任务"过载"？就好像我需要一个方法来确定任务何时完成，以便可以调用下一个任务。我感谢任何关于php、httpclient等的反馈……任何影响性能的反馈。

编辑：当我将延迟降低到0.01秒时，我的系统不再崩溃。我现在在onpostexecute方法中捕获了null值。然而，我还是会结结巴巴。

    private void startsendingdata() {
            loop = 0;
            if (sendingdatathread != null)
                sendingdatathread.interrupt();
            sendingdatathread = new Thread() {
                public void run() {
                    while (loop < 5000) {
                        try {
                            runOnUiThread(new Runnable() {
                                @Ov
erride
                            public void run() {
                                new SendDataTask().execute();
                                loop++;
                                myvar = Integer.toString(loop);
                            }
                        });
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                        break;
                    }
                }
            }
        };
        sendingdatathread.start();
    }
    private class SendDataTask extends AsyncTask<String, Integer, Double> {
        @Override
        protected Double doInBackground(String... params) {
            postData();
            return null;
        }
        protected void onPostExecute(Double result) {
        }
        public void postData() {
            try {
                List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                // put all variables here (with connection code attached)
                nameValuePairs.add(new BasicNameValuePair("connectioncode",
                        connectioncode));
                nameValuePairs.add(new BasicNameValuePair("myvar", myvar));
                httppostsend
                        .setEntity(new UrlEncodedFormEntity(nameValuePairs));
                response = httpclient.execute(httppostsend);
                response.getEntity().consumeContent();
            } catch (UnsupportedEncodingException e) {
                e.printStackTrace();
            } catch (ClientProtocolException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }
    private void startgettingdata() {
        if (gettingdatathread != null)
            gettingdatathread.interrupt();
        gettingdatathread = new Thread() {
            public void run() {
                while (true) {
                    try {
                        runOnUiThread(new Runnable() {
                            @Override
                            public void run() {
                                new GetDataTask().execute();
                            }
                        });
                        Thread.sleep(1000);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                        break;
                    }
                }
            }
        };
        gettingdatathread.start();
    }
    private class GetDataTask extends AsyncTask<String, Integer, Double> {
        @Override
        protected Double doInBackground(String... params) {
            getData();
            return null;
        }
        protected void onPostExecute(Double result) {
            if (!line.isEmpty() && line!=null&&connectioncode.length() >= 6) {

                tvLapTime.setText("MyVar: " + myvar);
            }
        }
        public void getData() {
            if (connectioncode.length() >= 6) {
                try {
                    List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
                    nameValuePairs.add(new BasicNameValuePair("connectioncode",
                            connectioncode));
                    httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
                    response = httpclient.execute(httppost);
                    entity = response.getEntity();
                    is = entity.getContent();
                    line = convertInputStreamToString(is);
                    response.getEntity().consumeContent();
                } catch (ClientProtocolException e1) {
                    e1.printStackTrace();
                } catch (IOException e1) {
                    e1.printStackTrace();
                }
            }
        }
    }
    // convert inputstream to String
        private static String convertInputStreamToString(InputStream inputStream)
                throws IOException {
            BufferedReader bufferedReader = new BufferedReader(
                    new InputStreamReader(inputStream));
            String result = "";
            while ((line = bufferedReader.readLine()) != null)
                result += line;
        try {
            json = new JSONObject(result);
        } catch (JSONException e1) {
            e1.printStackTrace();
        }
        if (json != null) {
            try {
                myvar = json.getString(connectioncode + "myvar");
            } catch (JSONException e) {
                e.printStackTrace();
            }
        }
        inputStream.close();
        return result;
    }