pmap 有点用
$ sudo pmap 35854 -X
35854: puma: cluster worker 0: 23406 [20201102084205]
Address Perm Offset Device Inode Size Rss Pss Referenced Anonymous LazyFree ShmemPmdMapped Shared_Hugetlb Private_Hugetlb Swap SwapPss Locked THPeligible ProtectionKey Mapping
b3b87880000 rw-p 00000000 00:00 0 116 116 116 116 116 0 0 0 0 0 0 0 0 0
103f63c00000 rw-p 00000000 00:00 0 512 476 476 472 476 0 0 0 0 0 0 0 0 0
115718980000 rw-p 00000000 00:00 0 512 512 512 512 512 0 0 0 0 0 0 0 0 0
1b52b9380000 rw-p 00000000 00:00 0 4 4 4 4 4 0 0 0 0 0 0 0 0 0
23c775200000 rw-p 00000000 00:00 0 780 780 780 772 780 0 0 0 0 0 0 0 0 0
23f341a00000 rw-p 00000000 00:00 0 4 4 4 4 4 0 0 0 0 0 0 0 0 0
23f341a01000 r--p 00000000 00:00 0 508 28 28 28 28 0 0 0 0 0 0 0 0 0
2c055cc8b000 ---p 00000000 00:00 0 468 0 0 0 0 0 0 0 0 0 0 0 0 0
2c055cd00000 rw-p 00000000 00:00 0 4 4 4 4 4 0 0 0 0 0 0 0 0 0
2c055cd01000 ---p 00000000 00:00 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0
2c055cd02000 r-xp 00000000 00:00 0 136 136 136 136 136 0 0 0 0 0 0 0 0 0
2c055cd24000 ---p 00000000 00:00 0 364 0 0 0 0 0 0 0 0 0 0 0 0 0
2c055cd7f000 ---p 00000000 00:00 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0
2c055cd80000 rw-p 00000000 00:00 0 4 4 4 4 4 0 0 0 0 0 0 0 0 0
2c055cd81000 ---p 00000000 00:00 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0
2c055cd82000 r-xp 00000000 00:00 0 500 8 8 8 8 0 0 0 0 0 0 0 0 0
2c055cdff000 ---p 00000000 00:00 0 129584 0 0 0 0 0 0 0 0 0 0 0 0 0
2e7694180000 rw-p 00000000 00:00 0 512 200 200 200 200 0 0 0 0 0 0 0 0 0
32aabb600000 rw-p 00000000 00:00 0 512 84 84 80 84 0 0 0 0 0 0 0 0 0
37777d180000 rw-p 00000000 00:00 0 512 348 348 344 348 0 0 0 0 0 0 0 0 0
3a010c6c4000 rw-p 00000000 00:00 0 32 32 32 32 32 0 0 0 0 0 0 0 0 0
55892a776000 r-xp 00000000 103:01 522081 3212 2700 81 2700 0 0 0 0 0 0 0 0 0 0 ruby
55892ac99000 r--p 00323000 103:01 522081 20 20 10 20 20 0 0 0 0 0 0 0 0 0 ruby
55892ac9e000 rw-p 00328000 103:01 522081 4 4 4 4 4 0 0 0 0 0 0 0 0 0 ruby
55892ac9f000 rw-p 00000000 00:00 0 52 40 28 20 40 0 0 0 0 0 0 0 0 0
55892c825000 rw-p 00000000 00:00 0 15808 15768 13712 15460 15768 0 0 0 0 0 0 0 0 0 [heap]
55892d795000 rw-p 00000000 00:00 0 1092 1092 1080 1080 1092 0 0 0 0 0 0 0 0 0 [heap]
55892d8a6000 rw-p 00000000 00:00 0 83264 76520 76520 76500 76520 0 0 0 0 0 0 0 0 0 [heap]
cat /proc/pid名称/status （没啥用）
cat /proc/35854/status Name: bundle Umask: 0002 State: S (sleeping) Tgid: 35854 Ngid: 0 Pid: 35854 PPid: 23406 TracerPid: 0 Uid: 1000 1000 1000 1000 Gid: 1000 1000 1000 1000 FDSize: 64 Groups: 4 20 24 25 27 29 30 44 46 108 114 1000 2000 NStgid: 35854 NSpid: 35854 NSpgid: 23403 NSsid: 23403