UNIX for Dummies Questions & Answers

%ulimit -a
nofiles(descriptors) 1024

This means that I can open up to 1024 file per process? But wonder if there is any hardlimit imposed by Solaris 2.6 (eg 255) ?

By the way, is there any tool that can trace which files (or sockets) are opened by a process?

Thanks
DY

hello.

to "watch" what a process is "doing" you can use the command "truss" on sun solaris. e.g. when you want to "trace" the command ls, do:

truss ls

you will see the open syscalls and what the command is doing. to see "open networkhandles" (ports, rpc, etc...) you can use

netstat -a

and

rpcinfo

cheers, alex...

thanks alex.


Do u know if there is any hard limit imposed by Solaris 2.6 on "nofiles(descriptors)" ?

cheers...

hm, i am not sure what you mean exactly, but i can give you any informations `bout limits for filesystems on solaris 2.6:

logical blocksize ufs: 8192 kb
physical blocksize : 512 bytes
fragment size: 1kb
minimum free space: 10%
rotational delay (gap): depends on the disktype
optimization type: time or space
number of bytes per inode: 2048 (2kb)

ufs filesystems supports blocking sizes of 4096 or 8192 (4 or 8 kb). 8 kb is the recommended blocksize. you can change the fragmentsize to 1,2,4, or 8kb.

since this version of solaris u can mount files bigger than 2 GB (large file systems) with the option -largefiles.

i hope this is partly what you want

cheers, alex...

Hi ALex,
Sorry, my question was not clear, I mean
>> Does Solaris 2.6 limits "nofiles" to 255 only ?
i.e. Does Solaris 2.6 limit a process to open a max of 255 sockets (or files) only, although ulimit may show that "nofiles = 1024"?

>> If a process has hit "nofiles" limit (hence running out of file descriptors), will there be any error message log to /var/adm/message ?

Thanks again...for all your patience and help

DY

hi.

oh, sorry. now i know what you want

and: my english is not so good, i am from vienna/austria, now living in frankfurt/germany since 1 year. i am working for an american company and try to speak a "good" english, but i am learning ;-)

o.k., here we go....

there are 7 ressources (time, file, data, stack, coredump, nofiles, vmemory) to set with ulimit, and the system have got "current ressource limits" (rlim_cur), which are the default values, and "maximum ressource limits" (rlim_max) which is the system-imposed maximum value. on solaris 2.5 and 2.6 the hard limit for nofiles is 1,024.

my littel table for you )
o-----------------------------------------------------------
| ressource default maximum
|
| time(seconds) unlimited unlimited
| file(blocks) unlimited unlimited
| data(kbytes) unlimited unlimited
| stack(kbytes) 8192 unlimited
| coredump(blocks) unlimited unlimited
| nofiles(descriptors) 64 1024
| vmemory(kbytes) unlimited unlimited
|


i hope this is what you need,

cheers, alex..