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我的 Centos 服务器会泄漏内存吗？

tag-icon • tag-icon linux memory centos6 memory-leak
我的 Centos 服务器会泄漏内存吗？

我收到一些有关虚拟化服务器内存使用情况的矛盾信息。最令人担忧的信息是：

每日服务器内存使用量

请注意，尽管已提交显示 12GB，但服务器仅分配了 4GB 的 RAM。

此外，如果我运行，ps aux | grep httpd我会得到以下信息：

root      1566  0.1  9.5 580392 375540 ?       Ss   Jun18  96:15 /usr/local/apache/bin/httpd -k start -DSSL
root      4212  0.0  9.4 580388 371948 ?       S    08:01   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody    7674  0.6  9.5 580392 373600 ?       S    08:26   0:02 /usr/local/apache/bin/httpd -k start -DSSL
nobody   10894  0.6  9.5 580532 373508 ?       S    08:28   0:01 /usr/local/apache/bin/httpd -k start -DSSL
nobody   11668  0.6  9.5 580392 373600 ?       S    08:29   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   11669  0.6  9.5 580392 373512 ?       S    08:29   0:01 /usr/local/apache/bin/httpd -k start -DSSL
nobody   11975  0.6  9.5 580392 373492 ?       S    08:29   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   12108  0.7  9.5 580392 373492 ?       S    08:29   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   12993  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13080  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13211  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13496  0.6  9.5 580392 373520 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13497  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13829  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13858  0.6  9.5 580392 373492 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   13963  0.6  9.5 580392 373484 ?       S    08:30   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14070  0.7  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14290  0.6  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14404  0.6  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14745  0.6  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14850  0.6  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   14957  0.5  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15061  0.6  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15174  0.8  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15228  0.6  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15263  0.4  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15264  0.5  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15290  0.7  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15291  0.5  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15294  0.4  9.5 580392 373484 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15296  0.6  9.5 580392 373492 ?       S    08:31   0:00 /usr/local/apache/bin/httpd -k start -DSSL
nobody   15401  0.5  9.5 580392 373484 ?       S    08:32   0:00 /usr/local/apache/bin/httpd -k start -DSSL
root     15506  0.0  0.0 103228   840 pts/0    S+   08:32   0:00 grep httpd

内存使用量总计超过 294.5%。

top也给出了类似的结果。

但是，如果我运行，free -m我会得到这个：

             total       used       free     shared    buffers     cached
Mem:          3831       3647        184          0        257       2358
-/+ buffers/cache:       1031       2799
Swap:         4031         29       4002

对我来说这似乎没问题，没有内存过度使用的迹象。

服务器相对较快，没有出现异常停机/迟缓，我希望保持这种状态。异常读数只是一种异常现象，还是更严重的问题？

答案1

您有足够的内存。如果您使用的内存达到最大值，并且缓冲区和缓存非常低，那么您的内存就会出现问题，SWAP 的使用也会增加，那么您可能会遇到可用 RAM 的问题。从您的帖子来看，一切都很好……

这是对已提交内存的简单解释：

Committed_AS: An estimate of how much RAM you would need to make a 99.99% guarantee that there never is OOM (out of memory) for this workload. Normally the kernel will overcommit memory. That means, say you do a 1GB malloc, nothing happens, really. Only when you start USING that malloc memory you will get real memory on demand, and just as much as you use. So you sort of take a mortgage and hope the bank doesn't go bust. Other cases might include when you mmap a file that's shared only when you write to it and you get a private copy of that data. While it normally is shared between processes. The Committed_AS is a guesstimate of how much RAM/swap you would need worst-case.

这是洞的解释http://www.redhat.com/advice/tips/meminfo.html

因此，您的记忆没有问题，一切都正常，这些读数都是正常的。

答案2

您的 apache 模型中存在共享内存使用情况，这很好。ps/top 不会向您显示确切的使用情况，这不是一件容易的事。尝试http://www.pixelbeat.org/scripts/ps_mem.py

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