Answer
The show system processes extensive command displays exhaustive system process information about software processes that are running on the device and have controlling terminals. This command is equivalent to the UNIX top command. However, the UNIX top command shows real-time memory usage, with the memory values constantly changing, while the show system processes extensive command provides a snapshot of memory usage in a given moment.
To check overall CPU and memory usage, enter the show system processes extensive command.
user@host> show system processes extensive
last pid: 544; load averages: 0.00, 0.00, 0.00 18:30:33
37 processes: 1 running, 36 sleeping
Mem: 25M Active, 3968K Inact, 19M Wired, 184K Cache, 8346K Buf, 202M Free
Swap: 528M Total, 64K Used, 528M Free
PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND
544 root 30 0 604K 768K RUN 0:00 0.00% 0.00% top
3 root 28 0 0K 12K psleep 0:00 0.00% 0.00% vmdaemon
4 root 28 0 0K 12K update 0:03 0.00% 0.00% update
528 aviva 18 0 660K 948K pause 0:00 0.00% 0.00% tcsh
204 root 18 0 300K 544K pause 0:00 0.00% 0.00% csh
131 root 18 0 332K 532K pause 0:00 0.00% 0.00% cron
186 root 18 0 196K 68K pause 0:00 0.00% 0.00% watchdog
27 root 10 0 512M 16288K mfsidl 0:00 0.00% 0.00% mount_mfs
1 root 10 0 620K 344K wait 0:00 0.00% 0.00% init
304 root 3 0 884K 900K ttyin 0:00 0.00% 0.00% bash
200 root 3 0 180K 540K ttyin 0:00 0.00% 0.00% getty
203 root 3 0 180K 540K ttyin 0:00 0.00% 0.00% getty
202 root 3 0 180K 540K ttyin 0:00 0.00% 0.00% getty
201 root 3 0 180K 540K ttyin 0:00 0.00% 0.00% getty
194 root 2 0 2248K 1640K select 0:11 0.00% 0.00% rpd
205 root 2 0 964K 800K select 0:12 0.00% 0.00% tnp.chassisd
189 root 2 -12 352K 740K select 0:03 0.00% 0.00% xntpd
114 root 2 0 296K 612K select 0:00 0.00% 0.00% amd
188 root 2 0 780K 600K select 0:00 0.00% 0.00% dcd
527 root 2 0 176K 580K select 0:00 0.00% 0.00% rlogind
195 root 2 0 212K 552K select 0:00 0.00% 0.00% inetd
187 root 2 0 192K 532K select 0:00 0.00% 0.00% tnetd
83 root 2 0 188K 520K select 0:00 0.00% 0.00% syslogd
538 root 2 0 1324K 516K select 0:00 0.00% 0.00% mgd
99 daemon 2 0 176K 492K select 0:00 0:00% 0:00% portmap
163 root 2 0 572K 420K select 0:00 0.00% 0.00% nsrexecd
192 root 2 0 560K 400K select 0:10 0.00% 0.00% snmpd
191 root 2 0 1248K 376K select 0:00 0.00% 0.00% mgd
537 aviva 2 0 636K 364K select 0:00 0.00% 0.00% cli
193 root 2 0 312K 204K select 0:07 0.00% 0.00% mib2d
5 root 2 0 0K 12K pfesel 0:00 0.00% 0.00% if_pfe
2 root -18 0 0K 12K psleep 0:00 0.00% 0.00% pagedaemon
0 root -18 0 0K 0K sched 0:00 0.00% 0.00% swapper
For information about the show system processes extensive command’s output fields, see the following table:
|
Field Name
|
Field Description
|
|
Mem.
|
Information about physical and virtual memory allocation.
|
|
Active
|
Memory allocated and actively used by the program.
|
|
Inact
|
Memory allocated but not recently used or memory freed by the programs. Inactive memory remains mapped in the address space of one or more processes and, therefore, counts toward the RSS value of those processes.
|
|
Wired
|
Memory that is not eligible to be swapped, usually used for in-kernel memory structures and/or memory physically locked by a process.
|
|
Cache
|
Memory that is not associated with any program and does not need to be swapped before being reused.
|
|
Buf
|
Size of memory buffer used to hold data recently called from the disk.
|
|
Free
|
Memory that is not associated with any programs. Memory freed by a process can become Inactive, Cache, or Free, depending on the method used by the process to free the memory.
|
|
Swap
|
Information about swap memory.
- Total—Total memory available to be swapped to disk.
- Used—Memory swapped to disk.
- Free—Memory available for further swap.
|
The rest of the command output displays information about the memory usage of each process. The SIZE field indicates the size of the virtual address space, and the RES field indicates the amount of the program in physical memory, which is also known as RSS or Resident Set Size.
For more information, see Junos OS Routing Protocols Library for Routing Devices