CentOS 6.4的64位内存使用量真的没有加起来

我最近迁移了托pipe服务提供商，在这个过程中，我的发行版从CentOS 5.9 64位变成了CentOS 6.4 64位。尽pipe增加了一点RAM（1 GiB而不是768 MiB），但新的运行CentOS 6.4的VPS总是内存不足。起初，我怀疑缓冲区和caching，但免费返回的值似乎不同意。这里有一些输出。

最佳

top - 14:16:22 up 13:27, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 44 total, 1 running, 43 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni,100.0%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 1048576k total, 1048576k used, 0k free, 0k buffers Swap: 0k total, 0k used, 0k free, 0k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 17678 tomcat 18 0 1772m 182m 42m S 0.0 17.8 0:09.80 java 3663 root 15 0 89788 21m 1960 S 0.0 2.1 0:00.70 miniserv.pl 3355 mysql 18 0 498m 20m 5872 S 0.0 2.0 0:01.31 mysqld 16358 root 18 0 403m 14m 8364 S 0.0 1.4 0:00.09 httpd 16360 apache 15 0 403m 7344 768 S 0.0 0.7 0:00.00 httpd 3692 root 18 0 71780 3708 2864 S 0.0 0.4 0:02.37 sshd 3751 root 16 0 71780 3624 2828 S 0.0 0.3 0:00.03 sshd 3422 root 15 0 82504 2364 736 S 0.0 0.2 0:00.13 sendmail 3170 haldaemo 15 0 24752 2316 1948 S 0.0 0.2 0:00.00 hald 3430 smmsp 18 0 78232 2092 692 S 0.0 0.2 0:00.00 sendmail 3694 root 15 0 11580 1888 1416 S 0.0 0.2 0:00.16 bash 3143 root 18 0 243m 1576 1092 S 0.0 0.2 0:00.03 rsyslogd 1 root 15 0 19232 1528 1288 S 0.0 0.1 0:19.65 init 3253 root 19 0 11308 1492 1236 S 0.0 0.1 0:00.00 mysqld_safe 13451 sockd 15 0 91792 1308 752 S 0.0 0.1 0:00.00 sockd 3387 sockd 18 0 91792 1304 752 S 0.0 0.1 0:00.37 sockd 3527 root 15 0 21308 1272 684 S 0.0 0.1 0:00.02 crond

vmstat -s; 自由

  1048576 total memory 1048576 used memory 0 active memory 0 inactive memory 0 free memory 0 buffer memory 0 swap cache 0 total swap 0 used swap 0 free swap 37863 non-nice user cpu ticks 0 nice user cpu ticks 14367 system cpu ticks 116512866 idle cpu ticks 30 IO-wait cpu ticks 0 IRQ cpu ticks 0 softirq cpu ticks 0 stolen cpu ticks 413960 pages paged in 15754892 pages paged out 0 pages swapped in 0 pages swapped out 0 interrupts 1704963753 CPU context switches 1395474517 boot time 46700605 forks total used free shared buffers cached Mem: 1048576 1048576 0 0 0 0 -/+ buffers/cache: 1048576 0 Swap: 0 0 0

SMEM

  PID User Command Swap USS PSS RSS 3390 sockd sockd: 0 136 145 820 13451 sockd sockd: 0 128 172 1308 13450 sockd sockd: 0 136 173 916 13452 sockd sockd: 0 136 173 916 13448 sockd sockd: 0 152 181 916 13459 sockd sockd: 0 160 185 916 13454 sockd sockd: 0 176 190 916 13455 sockd sockd: 0 176 190 916 13456 sockd sockd: 0 176 190 916 13457 sockd sockd: 0 176 190 916 13458 sockd sockd: 0 176 190 916 13449 sockd sockd: 0 136 192 1080 7205 sockd sockd: 0 180 197 916 7208 sockd sockd: 0 180 197 916 7240 sockd sockd: 0 180 197 916 7243 sockd sockd: 0 180 197 916 13453 sockd sockd: 0 184 197 916 3637 root /usr/sbin/atd 0 200 200 480 7234 sockd sockd: 0 188 201 916 7237 sockd sockd: 0 188 201 916 3217 root xinetd -stayalive -pidfile 0 228 232 984 3171 root hald-runner 0 196 240 1268 1 root ini 0 240 254 1528 3253 root /bin/sh /usr/bin/mysqld_saf 0 256 270 1492 3387 sockd sockd -D 0 268 303 1304 3378 root /usr/sbin/saslauthd -m /var 0 40 326 964 3379 root /usr/sbin/saslauthd -m /var 0 40 326 660 1233 root /sbin/udevd -d 0 376 377 700 3143 root /sbin/rsyslogd -i /var/run/ 0 484 498 1576 3694 root -bash 0 472 516 1888 3527 root crond 0 588 589 1272 3160 dbus dbus-daemon --system 0 620 622 1012 3209 root /usr/sbin/sshd 0 684 687 1212 3170 haldaemon hald 0 812 889 2316 3751 root sshd: root 0 804 987 3624 3692 root sshd: root@pts/0 0 876 1059 3708 3430 smmsp sendmail: Queue runner@01:0 0 1400 1411 2092 3422 root sendmail: accepting connect 0 1628 1644 2364 16360 apache /usr/sbin/httpd 0 168 3376 7344 16358 root /usr/sbin/httpd 0 344 3810 14912 17766 root python /usr/sbin/smem 0 5684 5752 7580 3355 mysql /usr/libexec/mysqld --based 0 15248 16070 21120 3663 root /usr/bin/perl /usr/libexec/ 0 19728 19909 21648 17678 tomcat /usr/java/latest/bin/../bin 0 184952 185049 186656

猫/ proc / meminfo

 MemTotal: 1048576 kB MemFree: 0 kB Buffers: 0 kB Cached: 0 kB SwapCached: 0 kB Active: 0 kB Inactive: 0 kB HighTotal: 0 kB HighFree: 0 kB LowTotal: 1048576 kB LowFree: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 0 kB Writeback: 0 kB AnonPages: 0 kB Mapped: 0 kB Slab: 0 kB PageTables: 0 kB NFS_Unstable: 0 kB Bounce: 0 kB CommitLimit: 0 kB Committed_AS: 0 kB VmallocTotal: 0 kB VmallocUsed: 0 kB VmallocChunk: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 Hugepagesize: 2048 kB

这些数字加起来只有250兆左右。我想知道是否有助于将VPS重新configuration为CentOS 5.9 32位，但是我不得不改变一些64位应用程序。

使用OpenVZ，你获得的内存价值基本上是毫无意义的。您获得的唯一有意义的值是每个进程的驻留集大小。 OpenVZ作为跨容器的系统资源pipe理物理内存和交换。它通常被认为是一个低成本，低性能的选项，特别是因为它在容器之间提供了非常低的内存和CPU隔离级别。