我正在尝试做yum update并得到“MemoryError”。 服务器（OpenVZ盒）有2G RAM和configuration1G InnoDB缓冲区的Percona MySQL服务器。 操作系统是CentOS 6.5，内核2.6.32-openvz-042stab088.4-amd64。
free -m输出：
total used free shared buffers cached Mem: 2048 728 1319 0 0 21 -/+ buffers/cache: 706 1341 Swap: 2048 0 2048
在主机上，盒子的内存configuration是：
vzctl set 101 --physpages 0:2G --swappages 0:2G --kmemsize unlimited --privvmpages 2000M:2G --vmguarpages 2000M:2G --oomguarpages 2G --save
当我停止MySQL， yum update正常工作。 为什么如果仍然有超过1G的内存，MySQL会让yum update失败？
完整的错误输出是：
yum update Loaded plugins: fastestmirror, priorities Loading mirror speeds from cached hostfile * base: mirror.mel.bkb.net.au * contrib: mirror.mel.bkb.net.au * epel: mirror.overthewire.com.au * extras: mirror.mel.bkb.net.au * updates: mirror.optus.net Traceback (most recent call last): File "/usr/bin/yum", line 29, in <module> yummain.user_main(sys.argv[1:], exit_code=True) File "/usr/share/yum-cli/yummain.py", line 285, in user_main errcode = main(args) File "/usr/share/yum-cli/yummain.py", line 136, in main result, resultmsgs = base.doCommands() File "/usr/share/yum-cli/cli.py", line 434, in doCommands self._getTs(needTsRemove) File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 99, in _getTs self._getTsInfo(remove_only) File "/usr/lib/python2.6/site-packages/yum/depsolve.py", line 110, in _getTsInfo pkgSack = self.pkgSack File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 887, in <lambda> pkgSack = property(fget=lambda self: self._getSacks(), File "/usr/lib/python2.6/site-packages/yum/__init__.py", line 683, in _getSacks self.plugins.run('exclude') File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 184, in run func(conduitcls(self, self.base, conf, **kwargs)) File "/usr/lib/yum-plugins/priorities.py", line 129, in exclude_hook repopkgs_archless = _pkglist_to_dict(conduit.getPackages(repo), repo.priority) File "/usr/lib/python2.6/site-packages/yum/plugins.py", line 592, in getPackages return self._base.pkgSack.returnPackages(arg) File "/usr/lib/python2.6/site-packages/yum/packageSack.py", line 499, in returnPackages ignore_case=ignore_case) File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 1646, in returnPackages pkgobjlist = self._buildPkgObjList(repoid, patterns, ignore_case) File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 1610, in _buildPkgObjList po = self._packageByKeyData(repo, x['pkgKey'], x) File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 754, in _packageByKeyData po = self.pc(repo, data) File "/usr/lib/python2.6/site-packages/yum/sqlitesack.py", line 187, in __init__ self._loadedfiles = False MemoryError
类似的问题，但没有帮助，因为我有更多的内存。
起初，我build议你启用vSwap内存模型，因为它比旧的UBC风格的系统更简单，更可靠。 有了它，你可以取代这个vzctl set 101 --physpages 0:2G --swappages 0:2G --kmemsize unlimited --privvmpages 2000M:2G --vmguarpages 2000M:2G --oomguarpages 2G --save vzctl set 101 --physpages 2G --swappages 2G --save由vzctl set 101 --physpages 2G --swappages 2G --save
在这之后，请给我看看这个命令的结果： cat /proc/user_beancounters
这个问题看起来像是内存问题，但是它与二级内存限制有关，这个限制不能通过free或top来显示（只限于cat / proc / user_beancounters）。