free 显示内存已用1.7G(排除缓存)，但是top内存占用第一的程序也只是用了75M内存，剩余内存不知所踪...
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GameXG
Sep 15, 2016, 11:46:05 PM9/15/16
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一台阿里云的服务器，系统是 ubuntu 14.04 ，1核2G内存，只跑一个go程序。
free显示已用内存1.7G，top显示这个go程序占用内存最大也只占用了70M内存，剩余的内存不知所踪。
确认启动这个程序才会占用1.7G内存，但是同一程序在512M vps上面算上整个系统才占用240M内存，程序本身不会根据环境动态配置。
查看了不少资料，检查了 /proc/meminfo 、mmon、slabtop 等等也无法确认内存到底跑到什么地方去了。
请教怎么确认到底是什么占用的内存？
下面是相关信息：
root@iZ62hgc3hpoZ:~# free -h
total used free shared buffers cached
Mem: 2.0G 1.7G 215M 412K 3.1M 15M
-/+ buffers/cache: 1.7G 234M
Swap: 0B 0B 0B
root@iZ62hgc3hpoZ:~# ps auxw|head -1;ps auxw|sort -rn -k4|head -10
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
root 2096 0.7 3.7 798244 76988 pts/0 Sl+ 20:33 0:01 ./forward
root 2066 0.0 0.1 22284 2944 pts/0 Ss 20:31 0:00 -bash
root 1950 0.0 0.1 22292 2404 pts/3 Ss 19:07 0:00 -bash
USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND
syslog 368 0.0 0.0 255840 688 ? Ssl 17:57 0:00 rsyslogd
root 924 0.0 0.0 15816 160 tty1 Ss+ 17:58 0:00 /sbin/getty -8 38400 tty1
root 9 0.0 0.0 0 0 ? S 17:57 0:00 [rcu_bh]
root 8 0.0 0.0 0 0 ? S 17:57 0:00 [rcuos/0]
root 777 0.0 0.0 23652 448 ? Ss 17:57 0:00 cron
root 774 0.0 0.0 61376 684 ? Ss 17:57 0:00 /usr/sbin/sshd -D
mmon 命令输出:
lnmonq14gqqqqqq[H for help]qqqHostname=iZ62hgc3hpoZqRefresh= 2secs qqq20:36.11qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqk
x Memory Stats qqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqx
x RAM High Low Swap Page Size=4 KB x
x Total MB 2001.9 -0.0 -0.0 0.0 x
x Free MB 119.2 -0.0 -0.0 0.0 x
x Free Percent 6.0% 100.0% 100.0% 0.0% x
x MB MB MB x
x Cached= 102.6 Active= 108.2 x
x Buffers= 5.0 Swapcached= 0.0 Inactive = 91.3 x
x Dirty = 0.0 Writeback = 0.0 Mapped = 4.8 x
x Slab = 101.5 Commit_AS = 153.1 PageTables= 2.6 x
xqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqqx
root@iZ62hgc3hpoZ:~# cat /proc/meminfo
MemTotal: 2049904 kB
MemFree: 124512 kB
Buffers: 5412 kB
Cached: 105412 kB
SwapCached: 0 kB
Active: 107488 kB
Inactive: 94048 kB
Active(anon): 90768 kB
Inactive(anon): 396 kB
Active(file): 16720 kB
Inactive(file): 93652 kB
Unevictable: 0 kB
Mlocked: 0 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 90796 kB
Mapped: 4696 kB
Shmem: 412 kB
Slab: 103948 kB
SReclaimable: 30260 kB
SUnreclaim: 73688 kB
KernelStack: 688 kB
PageTables: 2616 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 1024952 kB
Committed_AS: 156768 kB
VmallocTotal: 34359738367 kB
VmallocUsed: 1697480 kB
VmallocChunk: 34358029192 kB
HardwareCorrupted: 0 kB
AnonHugePages: 36864 kB
HugePages_Total: 0
HugePages_Free: 0
HugePages_Rsvd: 0
HugePages_Surp: 0
Hugepagesize: 2048 kB
DirectMap4k: 32640 kB
DirectMap2M: 2064384 kB
DirectMap1G: 0 kB
slabtop 命令输出：
Active / Total Objects (% used) : 379789 / 382445 (99.3%)
Active / Total Slabs (% used) : 14435 / 14435 (100.0%)
Active / Total Caches (% used) : 64 / 96 (66.7%)
Active / Total Size (% used) : 100656.00K / 101729.76K (98.9%)
Minimum / Average / Maximum Object : 0.01K / 0.27K / 8.00K
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
73728 73480 99% 0.06K 1152 64 4608K kmalloc-64
47712 47712 100% 0.12K 1491 32 5964K kmalloc-128
32403 32086 99% 0.19K 1543 21 6172K dentry
26859 26346 98% 0.19K 1279 21 5116K kmalloc-192
25856 25856 100% 0.02K 101 256 404K kmalloc-16
25216 25216 100% 0.03K 197 128 788K kmalloc-32
24976 24976 100% 0.07K 446 56 1784K Acpi-ParseExt
24432 24147 98% 0.25K 1527 16 6108K kmalloc-256
23496 23496 100% 0.62K 1958 12 15664K sock_inode_cache
23436 23436 100% 1.75K 2604 9 41664K TCP
15408 15408 100% 0.11K 428 36 1712K sysfs_dir_cache
12792 12426 97% 0.10K 328 39 1312K buffer_head
6426 5980 93% 0.57K 459 14 3672K inode_cache
3584 3584 100% 0.01K 7 512 28K kmalloc-8
2380 2380 100% 0.05K 28 85 112K shared_policy_node
2288 2207 96% 0.96K 286 8 2288K ext4_inode_cache
1512 1512 100% 0.07K 27 56 108K anon_vma
1428 1428 100% 0.04K 14 102 56K ext4_extent_status
1008 1008 100% 0.09K 24 42 96K kmalloc-96
1036 873 84% 0.55K 74 14 592K radix_tree_node
792 792 100% 0.66K 66 12 528K shmem_inode_cache
544 501 92% 1.00K 68 8 544K kmalloc-1024
560 496 88% 0.50K 70 8 280K kmalloc-512
492 431 87% 0.63K 41 12 328K proc_inode_cache
24976 24976 100% 0.07K 446 56 1784K Acpi-ParseExt
56 56 100% 0.07K 1 56 4K ext4_io_end
153 153 100% 0.08K 3 51 12K Acpi-State
0 0 0% 0.09K 0 46 0K ext4_xattr
root@iZ62hgc3hpoZ:~# echo `cat /proc/slabinfo |awk 'BEGIN{sum=0;}{sum=sum+$3*$4;}END{print sum/1024/1024}'` MB
99.3455 MB
root@iZ62hgc3hpoZ:~# echo `grep PageTables /proc/meminfo | awk '{print $2}'` KB
2224 KB
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