Having trouble with Ubuntu server 18.04 and dynamic memory. I have some Debian 9 servers and ubuntu servers running on Hyper-V. The Debian servers perform as expected with dynamic memory and jump around between 512mb and 2gb of memory. My ubuntu servers seem to jump straight to the max memory available about 15seconds after a reboot. I believe it's all in cache but I'm not an expert in Linux. Flushing the cache it fills up again before the memory shrinks anyway. Can I get some pointers in chasing this down, A lot of work involved changing these newer servers back to Debian.
Thanks in advance.
Thanks in advance.
Code:
#free
total used free shared buff/cache available
Mem: 4026308 1558392 1478392 73488 989524 2331652
Swap: 2097148 780 2096368Code:
#slabtop
OBJS ACTIVE USE OBJ SIZE SLABS OBJ/SLAB CACHE SIZE NAME
116466 111417 0% 0.19K 2773 42 22184K dentry
83820 83820 100% 0.13K 1397 60 11176K kernfs_node_cache
66630 65980 0% 1.06K 2221 30 71072K ext4_inode_cache
63616 63171 0% 0.50K 994 64 31808K kmalloc-512
55808 54321 0% 0.06K 872 64 3488K pid
48009 48009 100% 0.10K 1231 39 4924K buffer_head
44733 44148 0% 0.20K 1147 39 9176K vm_area_struct
35351 34589 0% 0.59K 667 53 21344K inode_cache
31808 31211 0% 0.25K 497 64 7952K filp
30314 29997 0% 0.09K 659 46 2636K anon_vma
28928 28928 100% 0.03K 226 128 904K kmalloc-32
25856 25420 0% 0.06K 404 64 1616K kmalloc-64
18522 18522 100% 0.19K 441 42 3528K cred_jar
16408 15088 0% 0.57K 293 56 9376K radix_tree_node
14790 14790 100% 0.04K 145 102 580K ext4_extent_status
13312 13312 100% 0.02K 52 256 208K kmalloc-16
11264 11264 100% 0.01K 22 512 88K kmalloc-8
10608 9571 0% 0.66K 221 48 7072K proc_inode_cache
10416 9761 0% 0.09K 248 42 992K kmalloc-96
9920 9483 0% 0.25K 155 64 2480K kmalloc-256
7084 7040 0% 0.69K 154 46 4928K sock_inode_cache
6970 6970 100% 0.02K 41 170 164K lsm_file_cache
5460 5460 100% 0.19K 130 42 1040K kmalloc-192
4704 4449 0% 1.00K 147 32 4704K kmalloc-1024
4335 4335 100% 0.05K 51 85 204K ftrace_event_field
3818 3493 0% 0.70K 83 46 2656K shmem_inode_cache
3264 3090 0% 0.12K 51 64 408K kmalloc-128
3264 3264 100% 0.12K 51 64 408K eventpoll_epi
3128 3128 100% 0.69K 68 46 2176K files_cache
2912 2912 100% 0.07K 52 56 208K eventpoll_pwq
2368 2311 0% 2.00K 148 16 4736K kmalloc-2048
2336 2336 100% 1.00K 73 32 2336K signal_cache
1920 1920 100% 0.06K 30 64 120K kmem_cache_node
1848 1848 100% 0.38K 44 42 704K kmem_cache
1472 1472 100% 0.09K 32 46 128K trace_event_file
1410 1410 100% 2.06K 94 15 3008K sighand_cache
1218 1218 100% 0.38K 29 42 464K mnt_cache
1215 1215 100% 2.06K 81 15 2592K mm_struct
1115 1006 0% 5.81K 223 5 7136K task_struct
1088 1088 100% 0.94K 32 34 1024K RAW
1064 1064 100% 0.14K 19 56 152K ext4_groupinfo_4k
730 730 100% 0.05K 10 73 40K nsproxy
592 576 0% 8.00K 148 4 4736K kmalloc-8192
588 588 100% 1.12K 21 28 672K RAWv6
560 560 100% 0.20K 14 40 112K file_lock_cache
512 512 100% 0.03K 4 128 16K fscrypt_info
496 458 0% 4.00K 62 8 1984K kmalloc-4096
408 408 100% 0.31K 8 51 128K nf_conntrack