increasing nfile parameter

[lawrenzo]

Hello,

Can someone clarify for me that whenI change the kernel param for nfile - is there any other params or settings that also need to be changed or any issues may occure. Would it be a good idea to make a copy of the /stand/vmunix?

Thanks in advance

[Oliver Charni · Accepted solution]

Hi!

There are no Kernel - Parameters which will be affected by the Change of nfile.
It's allways good to have a Copy of /stand/vmunix!!

[Wouter Jagers]

Nope, nfile has no 'relations' which you should take into account. You should be able to change it just like that.

It is -always- a good idea to make a vmunix.prev file, since it ensures your ability to reboot should anything go wrong.

greets
Wout

[lawrenzo]

ok thanks - much appreciated

[Pete Randall]

The parameter nfile is typically part of a formula. Something like(16*(NPROC+16+MAXUSERS)/10+32+2*(NPTY+NSTRPTY+NSTRTEL))

Unless you want to replace this formula with a hard-coded value. You might want to consider increasing NPROC or MAXUSERS instead. This will have the effect of making a consistent increase to all the values that use NPROC in their formulae: effective_maxpid, ksi_alloc_max, ninode, nkthread, nproc, nsysmap, and nsysmap64. Increasing MAXUSERS would have a similar ripple effect.

Just a thought.


Pete

[lawrenzo]

Thanks Pete,

I noticed the formula and updated the maxusers param which did the trick.

cheers

[Pete Randall]

You're welcome!


Pete

[Bill Hassell]

MAXUSERS is a good parameter to use when your system is growing and you don't have the time (or tools) needed to understand and monitor the kernel parameters. If NFILE must be increased, most likely, NPROC will be next. The relationship is easy to understand. NPROC is the maximum number of processes, so if more processes are run, more files (NFILE) will be open. If you use SAM to make your changes, a backup will be made of your current /stand/vmunix file as /stand/vmunix.prev which can be selected during interactive bootup in case of problems.

[Judy Traynor]

I have on occasion, needed to bump nflocks when bumping nfiles.

ninodes is another - but keep in mind - these are only when the standard kernel isn't right.