集群管理——开机B7问题（内存条ERROR），caffe编译matlab接口错误解决方法

开机B7问题

之前闲置了一台计算主机，今天开机发现一直卡在SYSTEM initializing 右下角自检显示卡在B7，开不了机进入BIOS都不行。期初以为是BIOS的问题，于是大费周章地拆开机箱，把显卡旁边的一个纽扣电池扣下来再装上去让bios初始化，结果还是一样。咨询了专业人士，说是内存条的问题，于是把内存条卸下来，用橡皮擦一擦吹一吹，然后换个卡槽上去，问题解决。双十一买了一块内存条给自己电脑装上，由于自己电脑是4个卡槽的，两两对称，之前只有一片。由于不是同一公司的产品，装的时候最好中间隔一片，而且起初的内存条位置不要动，否则会陷入引导问题（亲测）。

caffe编译matlab接口错误

一：切记 matlabaR2014(5)需要的GCC版本是4.7，否侧会报错。

gcc降级到4.7：

$ sudo apt-get install -y gcc-4.7
$ sudo apt-get install -y g++-4.7
$ cd /usr/bin
$ sudo rm gcc
$ sudo ln -s gcc-4.7 gcc
$ sudo rm g++
$ sudo ln -s g++-4.7 g++
查询：
$gcc -v
$g++ -v

二：make matcaffe的时候出现了奇怪的问题。
错误如下：

$make matcaffe -j8
MEX matlab/+caffe/private/caffe_.cpp
使用 'g++' 编译。
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp: In function ‘void delete_solver(int, mxArray**, int, const mxArray**)’:
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:208:3: warning: lambda expressions only available with -std=c++11 or -std=gnu++11 [enabled by default]
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:208:4: error: no matching function for call to ‘remove_if(std::vector<boost::shared_ptr<caffe::Solver<float> > >::iterator, std::vector<boost::shared_ptr<caffe::Solver<float> > >::iterator, delete_solver(int, mxArray**, int, const mxArray**)::<lambda(const boost::shared_ptr<caffe::Solver<float> >&)>)’
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:208:4: note: candidate is:
In file included from /usr/include/c++/4.7/algorithm:63:0,
from ./include/caffe/blob.hpp:4,
from ./include/caffe/caffe.hpp:7,
from /home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:18:
/usr/include/c++/4.7/bits/stl_algo.h:1166:5: note: template<class _FIter, class _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:208:4: error: template argument for ‘template<class _FIter, class _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)’ uses local type ‘delete_solver(int, mxArray**, int, const mxArray**)::<lambda(const boost::shared_ptr<caffe::Solver<float> >&)>’
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:208:4: error:   trying to instantiate ‘template<class _FIter, class _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)’
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp: In function ‘void delete_net(int, mxArray**, int, const mxArray**)’:
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:293:3: warning: lambda expressions only available with -std=c++11 or -std=gnu++11 [enabled by default]
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:293:4: error: no matching function for call to ‘remove_if(std::vector<boost::shared_ptr<caffe::Net<float> > >::iterator, std::vector<boost::shared_ptr<caffe::Net<float> > >::iterator, delete_net(int, mxArray**, int, const mxArray**)::<lambda(const boost::shared_ptr<caffe::Net<float> >&)>)’
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:293:4: note: candidate is:
In file included from /usr/include/c++/4.7/algorithm:63:0,
from ./include/caffe/blob.hpp:4,
from ./include/caffe/caffe.hpp:7,
from /home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:18:
/usr/include/c++/4.7/bits/stl_algo.h:1166:5: note: template<class _FIter, class _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:293:4: error: template argument for ‘template<class _FIter, c
4000
lass _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)’ uses local type ‘delete_net(int, mxArray**, int, const mxArray**)::<lambda(const boost::shared_ptr<caffe::Net<float> >&)>’
/home/zkk/caffe/matlab/+caffe/private/caffe_.cpp:293:4: error:   trying to instantiate ‘template<class _FIter, class _Predicate> _FIter std::remove_if(_FIter, _FIter, _Predicate)’

Makefile:518: recipe for target 'matlab/+caffe/private/caffe_.mexa64' failed
make: *** [matlab/+caffe/private/caffe_.mexa64] Error 255

解决方法：

在当前编译的caffe主目录的Makefile里面，建议用gedit打开，搜索CXXFLAGS，找到这句话：

CXXFLAGS += -MMD -MP，然后在这句话下面一行加入：CXXFLAGS += -std=c++11

切记不要把上面一句删了！

重新在caffe中make clean,make -j40 all,make -j40 pycaffe,make matcaffe等就行了。