问题：运行场景后，之前运行的好好的Vuser突然全部没有init，而是卡在pending上了，并且过了一段时间提示“Abnormal termination, caused by mdrv process termination”，找下了，网上的答案如下：
转自：http://loadrunner.wetpaint.com/page/Abnormal+termination,+caused+by+mdrv+process+termination
f the LR articles. The Loadrunner vusers are run by a process called 'mdrv.exe'. Whenever this process encounters errors   due to various reasons it may terminate. Some of the possible reasons are as follows
  1. The Host machine ( Load generator) is running too many Vusers as a result of which it system resources are being maximized. ( i.e. Consistent over 90% CPU and Memory utilization). The mdrv process does not get enough resources to process the request as a result it fails
  2. If you have Custom C coding, there is a possibility of allocated memory not being freed or memory violation errors which can lead to 'mdrv process termination'.
  3. Replay the script with think time.
  4. Turn off extended log when running the script in the controller.
  5. Do not use the controller itself as the loadgenerator. i.e. have a remote LoadGenerator.
  6. Introduce iteration pacing, if running more than one iteration each vuser.
  7. Open the file C:\WinNT\wlrun7.ini in a text editor, modify the entry from: AgentMaxThreadsPerDriver=50 to AgentMaxThreadsPerDriver=20 or 10
  8. Run Agent as process instead of service Launch command prompt and navigate to C:\Program Files\Mercury\Loadrunner\Launch_service\bin and run the command magentserive -remove. This will remove the agent. Now run the command magentproc -install This will install the agent as a process.
  9. Run vusers as process instead of threads.Please go to Runtime Settings > Miscellaneous > Multithreading > RunVuser as a process.

这个是网上搜索得来的结果，但是把线程改进程的思路并不适用我们的运行场景。

另一种解决方式：

看了下Tomcat那边的情况，发现有很多session占用，清除了一下，重新运行就好了.

可是问题又来了

之前测试过很多轮，万级的vuser，都没有出现这种情况。

具体原因还需要分析