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How can I record cpu & ram usage on Ubuntu?
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/2018/03/12/How-can-I-record-cpu-_-ram-usage-on-Ubuntu_
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You can use the built-in utility vmstat. You can get a technical overview using man vmstat. One note is the software in its default parameters doesn’t lend itself well to modern computers with abundant RAM. For example:
$ vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
3 0 0 578120 827392 3317480 0 0 14 65 250 149 34 17 49 0 0
The RAM is listed in bytes causing detail lines not to line up with column headings. To circumvent instruct vmstat to display in Megabytes:
$ vmstat -S M
procs -----------memory---------- ---swap-- -----io---- -system-- ------cpu-----
r b swpd free buff cache si so bi bo in cs us sy id wa st
1 0 0 576 808 3236 0 0 14 65 250 149 34 17 49 0 0
The documentation below which is from: Use vmstat to Monitor System Performance
What is vmstat?
vmstat is a tool that collects and reports data about your system’s memory, swap, and processor resource utilization in real time. It can be used to determine the root cause of performance and issues related to memory use.
How to Use vmstat
Use the vmstat command to run the program. Consider the following output:
$ vmstat
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 3532 148760 50700 1397880 0 0 1 2 6 6 3 1 97 0
This data provides an average view of virtual memory and system usage since the last reboot. Often, the following form of the command is used:
vmstat [interval] [count]
In this example, the first line of data provides the average since the last boot time. Subsequent reports, until [count] is reached, report data on the current state of the system every [interval] seconds.
vmstat Commands
vmstat is often run with an interval of 1 second for a small number of seconds depending on kind of problem the administrator is trying to diagnose. The following example illustrates an interval of one (1) second twenty (20) times:
$ vmstat 1 20
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 3996 168488 57100 1368636 0 0 1 2 0 0 3 1 97 0
0 0 3996 168604 57100 1368728 0 0 0 0 144 303 1 0 100 0
0 0 3996 168604 57100 1368984 0 0 256 0 162 464 1 0 99 0
0 0 3996 168604 57100 1368972 0 0 0 0 239 638 3 0 97 0
0 0 3996 168604 57100 1368952 0 0 0 0 242 529 1 1 99 0
0 0 3996 168604 57100 1368952 0 0 0 0 148 430 1 0 99 0
1 0 3996 168604 57100 1368952 0 0 0 0 222 451 6 0 94 0
0 0 3996 168604 57100 1368952 0 0 0 0 141 270 2 0 98 0
0 0 3996 168604 57100 1368952 0 0 0 0 166 450 1 0 99 0
0 0 3996 168604 57100 1368952 0 0 0 0 133 410 0 0 99 0
0 0 3996 168604 57100 1368952 0 0 0 0 196 398 0 0 99 0
0 0 3996 168604 57100 1368952 0 0 0 0 187 510 1 0 100 0
0 0 3996 168604 57108 1368952 0 0 0 16 263 677 2 0 97 1
0 0 3996 168604 57108 1368952 0 0 0 0 205 431 1 0 98 0
0 0 3996 168604 57108 1368964 0 0 0 0 179 467 1 0 98 0
0 0 3996 168604 57108 1368964 0 0 0 0 169 446 2 0 98 0
0 0 3996 168604 57108 1368964 0 0 0 0 202 365 2 0 98 0
0 0 3996 168604 57108 1369208 0 0 256 0 226 458 2 1 96 0
0 0 3996 168604 57108 1369208 0 0 0 40 202 501 2 0 98 0
0 0 3996 168604 57108 1369220 0 0 0 0 154 295 2 0 98 0
You may run vmstat without a [count] argument if you want ongoing reports of the system’s status in real time. In these cases, intervals of 30 seconds or more may be desirable.
$ vmstat 30
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 3996 167868 57108 1369788 0 0 1 2 0 0 3 1 97 0
0 0 3996 167860 57108 1369920 0 0 0 0 274 604 2 0 98 0
0 0 3996 167860 57108 1369928 0 0 0 0 196 481 1 0 98 0
0 0 3996 167860 57116 1369908 0 0 0 12 164 414 1 1 97 1
0 0 3996 167860 57116 1369892 0 0 0 0 168 320 0 0 100 0
0 0 3996 167860 57116 1369884 0 0 0 0 142 398 1 0 99 0
0 0 3996 167860 57116 1369880 0 0 0 0 175 450 1 1 98 0
^C
You may choose to direct this output to a file for logging instead of leaving it running endlessly in a background terminal session. To stop the vmstat process, send the break character (^C or Control+C) as above.
In the default operation, vmstat displays memory statistics in kilobytes. vmstat considers a single kilobyte equal to 1024 bytes. To generate vmstat reports where 1 kilobyte is equal to 1000 bytes, use the following form:
$ vmstat -S k 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 4091 150192 58982 1422041 0 0 1 2 0 0 3 1 97 0
0 0 4091 150183 58982 1422381 0 0 256 0 201 518 1 0 99 0
2 0 4091 150183 58982 1422356 0 0 0 0 638 1356 7 1 92 0
0 0 4091 150183 58982 1422360 0 0 0 0 859 1087 5 2 93 0
0 0 4091 150183 58982 1422331 0 0 0 0 404 1100 2 0 97 0
0 0 4091 150183 58982 1422331 0 0 0 0 281 601 2 0 97 0
0 0 4091 150183 58982 1422327 0 0 0 0 279 468 3 0 97 0
0 0 4091 150183 58982 1422331 0 0 0 0 250 572 3 0 97 0
0 0 4091 150183 58990 1422323 0 0 0 16 280 598 4 0 95 1
0 0 4091 150183 58998 1422319 0 0 0 52 270 451 3 0 96 1
vmstat can also display reports with memory sizes reported in megabytes. vmstat reports with the argument -S m will consider a single megabyte equal to 1000 kilobytes as follows:
$ vmstat -S m 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 4 169 58 1404 0 0 1 2 0 0 3 1 97 0
0 0 4 169 58 1405 0 0 0 0 194 508 1 0 98 0
0 0 4 169 58 1405 0 0 0 0 154 443 0 0 99 0
0 0 4 169 58 1405 0 0 0 0 192 380 0 0 100 0
0 0 4 169 58 1405 0 0 0 0 287 766 3 0 97 0
1 0 4 169 58 1405 0 0 0 0 222 583 1 1 99 0
0 0 4 169 58 1405 0 0 0 36 166 304 1 0 99 0
0 0 4 169 58 1405 0 0 0 0 189 473 1 0 99 0
0 0 4 169 58 1405 0 0 0 0 164 430 1 0 99 0
0 0 4 169 58 1405 0 0 0 0 186 343 0 0 100 0
vmstat is also able to display megabytes such that a single megabyte is equal to 1024 kilobytes with the argument -S M. Consider the following example:
$ vmstat -S M 1 10
procs -----------memory---------- ---swap-- -----io---- -system-- ----cpu----
r b swpd free buff cache si so bi bo in cs us sy id wa
0 0 3 162 55 1339 0 0 1 2 0 0 3 1 97 0
0 0 3 162 55 1339 0 0 0 0 425 700 1 1 98 0
0 0 3 162 55 1339 0 0 0 0 712 997 1 2 97 0
0 0 3 162 55 1339 0 0 0 20 479 1079 3 0 96 1
0 0 3 162 55 1339 0 0 0 0 264 406 2 0 98 0
0 0 3 162 55 1339 0 0 0 0 273 552 3 0 97 0
0 0 3 162 55 1339 0 0 0 0 218 467 1 0 99 0
0 0 3 162 55 1339 0 0 0 0 250 434 1 0 99 0
0 0 3 162 55 1339 0 0 0 0 200 444 2 0 98 0
0 0 3 162 55 1339 0 0 0 0 313 771 3 1 96 0