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root@ubuntu20:~# cat /proc/meminfo MemTotal: 1004680 kB MemFree: 78124 kB MemAvailable: 558256 kB Buffers: 217196 kB Cached: 410028 kB SwapCached: 5724 kB Active: 350552 kB Inactive: 349728 kB Active(anon): 74496 kB Inactive(anon): 72488 kB Active(file): 276056 kB Inactive(file): 277240 kB Unevictable: 18468 kB Mlocked: 18468 kB SwapTotal: 2097148 kB SwapFree: 1970172 kB Dirty: 1324 kB Writeback: 0 kB AnonPages: 89260 kB Mapped: 121588 kB Shmem: 66048 kB KReclaimable: 108468 kB Slab: 172396 kB SReclaimable: 108468 kB SUnreclaim: 63928 kB KernelStack: 2400 kB PageTables: 3140 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 2599488 kB Committed_AS: 647488 kB VmallocTotal: 34359738367 kB VmallocUsed: 20048 kB VmallocChunk: 0 kB Percpu: 1536 kB HardwareCorrupted: 0 kB AnonHugePages: 0 kB ShmemHugePages: 0 kB ShmemPmdMapped: 0 kB FileHugePages: 0 kB FilePmdMapped: 0 kB CmaTotal: 0 kB CmaFree: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB Hugetlb: 0 kB DirectMap4k: 561144 kB DirectMap2M: 487424 kB DirectMap1G: 0 kB root@ubuntu20:~#
root@ubuntu20:~# free -m
total used free shared buff/cache available
Mem: 981 186 74 64 719 544
Swap: 2047 124 1923
root@ubuntu20:~#
root@ubuntu20:~# sar -r 1 Linux 5.4.0-65-generic (ubuntu20) 03/04/2021 _x86_64_ (2 CPU) 08:48:38 AM kbmemfree kbavail kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 08:48:39 AM 76532 557816 127228 12.66 217480 410824 648660 20.91 352064 349816 68 08:48:40 AM 76500 557784 127260 12.67 217480 410824 648660 20.91 352064 349816 68 08:48:41 AM 76500 557784 127260 12.67 217480 410824 648660 20.91 352064 349816 68 08:48:42 AM 76468 557752 127292 12.67 217480 410824 648660 20.91 352064 349816 68 08:48:43 AM 76500 557784 127260 12.67 217480 410824 648660 20.91 352092 349816 52 08:48:44 AM 76500 557784 127260 12.67 217480 410824 648660 20.91 352092 349816 52 08:48:45 AM 76500 557784 127260 12.67 217480 410824 648660 20.91 352092 349816 52 ^C Average: 76500 557784 127260 12.67 217480 410824 648660 20.91 352076 349816 61 root@ubuntu20:~#
root@ubuntu20:~# dstat -t -gs --mem --vm --ipc
----system---- ---paging-- ----swap--- ------memory-usage----- -----virtual-memory---- --sysv-ipc-
time | in out | used free| used free buff cach|majpf minpf alloc free|msg sem shm
04-03 08:49:38| 44B 131B| 125M 1923M| 258M 151M 214M 329M| 0 29 85 85 | 0 0 0
04-03 08:49:39| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 7 22 26 | 0 0 0
04-03 08:49:40| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 17 17 | 0 0 0
04-03 08:49:41| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 16 8 | 0 0 0
04-03 08:49:42| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 35 33 | 0 0 0
04-03 08:49:43| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 16 24 | 0 0 0
04-03 08:49:44| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 17 17 | 0 0 0
04-03 08:49:45| 0 0 | 125M 1923M| 258M 151M 214M 329M| 0 0 32 24 | 0 0 0
04-03 08:49:46| 0 0 | 125M 1923M| 258M 150M 215M 329M| 0 5 87 30 | 0 0 0^C
root@ubuntu20:~# vmstat -taw 1 procs -----------------------memory---------------------- ---swap-- -----io---- -system-- --------cpu-------- -----timestamp----- r b swpd free inact active si so bi bo in cs us sy id wa st JST 0 0 127744 157036 260416 372668 0 0 12 14 3 1 0 0 100 0 0 2021-03-04 08:50:42 0 0 127744 157044 260428 372888 0 0 4 28 170 145 1 0 99 0 0 2021-03-04 08:50:43 0 0 127744 154616 261928 372924 0 0 16 0 438 270 2 1 97 0 0 2021-03-04 08:50:44 0 0 127744 156256 260412 372924 0 0 0 0 907 147 0 0 100 0 0 2021-03-04 08:50:45 0 0 127744 154988 260696 373016 0 0 368 0 569 297 3 1 97 0 0 2021-03-04 08:50:46 0 0 127744 154988 260696 373016 0 0 0 0 110 101 0 0 100 0 0 2021-03-04 08:50:47 0 0 127744 154988 260696 373016 0 0 0 116 151 129 0 0 100 1 0 2021-03-04 08:50:48 ^C root@ubuntu20:~#