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Operating Systems Solaris Solaris 10 /proc making filesystem full Post 302323124 by forsnick on Friday 5th of June 2009 12:55:50 PM
Old 06-05-2009
Everything is a file

The /proc system in Solaris uses procfs. Think of it as any other vfs, but instead of representing data on disk, it represents the process structure of running applications. The reason you are seeing it as taking up space is because procfs contains a representation of a given processes address space, as, and as such can be quite large.

Also, keep in mind the command you issued traverses mounted filesystems.

Finally, as the title suggested, "everything is a file." This is a fundamental Unix design principle. It is why devices, ports, virtual terminals, etc, are all accessed as files and through standard system calls like open(), for example. /proc is just extending the "everything is a file" principle to include processes for ease of access. It makes creating (and using) tools like 'pgrep', 'pkill', 'preap' (a personal fav), 'pmap', etc., easy.

Quote:
Originally Posted by Sara-sh
Just wondered, if there is no real files in /proc, why does it show up as the highest space occupier on my server (this is an old Solaris 2.6):

#du -sk * |sort -rn |head
723555 proc
302662 usr
282955 opt
249259 export
209532 var
8568 tmp
5997 kernel
5019 sbin
3965 platform
2536 etc

-----Post Update-----

I would appreciate a quick response, Thanks.
 

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ptree(1)																  ptree(1)

NAME
ptree - print process trees SYNOPSIS
/usr/bin/ptree [-a] [-c] [-z zone] [pid | user] ... ptree prints the process trees containing the specified pids or users, with child processes indented from their respective parent pro- cesses. An argument of all digits is taken to be a process-id, otherwise it is assumed to be a user login name. The default is all pro- cesses. The following options are supported: -a All. Print all processes, including children of process 0. -c Contracts. Print process contract memberships in addition to parent-child relationships. See process(4). This option implies the -a option. -z zone Zones. Print only processes in the specified zone. Each zone ID can be specified as either a zone name or a numerical zone ID. This option is only useful when executed in the global zone. The following operands are supported: pid Process-id or a list of process-ids. ptree also accepts /proc/nnn as a process-id, so the shell expansion /proc/* can be used to specify all processes in the system. user Username or list of usernames. Processes whose effective user IDs match those given are displayed. Example 1: Using ptree The following example prints the process tree (including children of process 0) for processes which match the command name ssh: $ ptree -a `pgrep ssh` 1 /sbin/init 100909 /usr/lib/ssh/sshd 569150 /usr/lib/ssh/sshd 569157 /usr/lib/ssh/sshd 569159 -ksh 569171 bash 569173 /bin/ksh 569193 bash The following exit values are returned: 0 Successful operation. non-zero An error has occurred. /proc/* process files See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWesu | +-----------------------------+-----------------------------+ |Interface Stability |See below. | +-----------------------------+-----------------------------+ The human readable output is Unstable. The options are Evolving. gcore(1), ldd(1), pargs(1), pgrep(1), pkill(1), plimit(1), pmap(1), preap(1), proc(1), ps(1), ppgsz(1), pwd(1), rlogin(1), time(1), truss(1), wait(1), fcntl(2), fstat(2), setuid(2), dlopen(3C), signal.h(3HEAD), core(4), proc(4), process(4), attributes(5), zones(5) 11 Oct 2005 ptree(1)
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