并行计算的问题---Failed to open matlabpool
一：问题
在查看一篇论文公布的Matlab源代码时，有这么一行代码：
matlabpool('open',8);
代码运行到此时，会出现错误：
Failed to open matlabpool. (For information in addition to the causing error, validate the configuration 'local' in the Configurations Manager.)
此错误提示并不太明晰，但是matlab命令行窗口又会提示：
Caused by:
Error using distcomp.interactiveclient/start (line 88)
Failed to start matlabpool.
This is caused by:
You requested a minimum of 8 workers, but the scheduler's ClusterSize property is currently set to allow
a maximum of 6 workers. To run a parallel job on more workers than this,increase the ClusterSize property setting in the 'local' configuration using the Configurations Manager. The default value for ClusterSize with a local scheduler is the number of cores on the local machine.
至此，问题已经很清楚，默认最大只有6个worker(不知道准确的翻译应该是什么)，而此时需要8个worker.
二：解决方法
图中红色圈出的就是我们需要更改的地方，此处我们填上8，之后一切正常。
三：题外话
如何直观的看出并行，我做了一个测试：
每个都是将近100多M，看样子，落后的机器真是跑不起来了啊。
鼠标放上去之后会提示：MATLAB pool open with 8 labs.
注：matlab环境：Win 7 64 bit + Matlab R2011b.
四：关于matlabpool
查看matlab的帮助，有如下一段：
Open or close a pool of MATLAB sessions for parallel computation matlabpool enables the parallel language features within the MATLAB language (e.g., parfor) by starting a parallel job that connects this MATLAB client session with a number of labs.
在查看一篇论文公布的Matlab源代码时，有这么一行代码：
matlabpool('open',8);
代码运行到此时，会出现错误：
Failed to open matlabpool. (For information in addition to the causing error, validate the configuration 'local' in the Configurations Manager.)
此错误提示并不太明晰，但是matlab命令行窗口又会提示：
Caused by:
Error using distcomp.interactiveclient/start (line 88)
Failed to start matlabpool.
This is caused by:
You requested a minimum of 8 workers, but the scheduler's ClusterSize property is currently set to allow
a maximum of 6 workers. To run a parallel job on more workers than this,increase the ClusterSize property setting in the 'local' configuration using the Configurations Manager. The default value for ClusterSize with a local scheduler is the number of cores on the local machine.
至此，问题已经很清楚，默认最大只有6个worker(不知道准确的翻译应该是什么)，而此时需要8个worker.
二：解决方法
打开菜单Parallel--->Manage Configurations，选中local，右键选择Properties，会出现如下窗口：
图中红色圈出的就是我们需要更改的地方，此处我们填上8，之后一切正常。
三：题外话
如何直观的看出并行，我做了一个测试：
在未开启matlabpool时，查看进程管理，只有一个MATLAB.exe，但是在开启matlabpool后，有9个MATLAB.exe.!!!如下图所示：
每个都是将近100多M，看样子，落后的机器真是跑不起来了啊。
而且在主窗口的右下角还有一个图标，如下图所示：
鼠标放上去之后会提示：MATLAB pool open with 8 labs.
注：matlab环境：Win 7 64 bit + Matlab R2011b.
四：关于matlabpool
查看matlab的帮助，有如下一段：
Open or close a pool of MATLAB sessions for parallel computation matlabpool enables the parallel language features within the MATLAB language (e.g., parfor) by starting a parallel job that connects this MATLAB client session with a number of labs.
