9.5.0-P2 and socket: too many open file descriptors

[Fr34k]

Please see my ANSWERs below:



----- Original Message ----
From: JINMEI Tatuya / 神明達哉 <Jinmei_Tatuya at isc.org>
To: Fr34k <freaknetboy at yahoo.com>
Cc: Bindlist <bind-users at isc.org>
Sent: Monday, August 11, 2008 10:55:55 PM
Subject: Re: 9.5.0-P2 and socket: too many open file descriptors

At Mon, 11 Aug 2008 19:38:57 -0700 (PDT),
Fr34k <freaknetboy at yahoo.com> wrote:

> Running 9.5.0-P2 on Solaris 9 and I continue to get "socket: too many open file descriptors" messages.
> I have tried "ulimit -n foobar" where foobar has been various numerical values and I still get the error.
> Am I just not assigning a large enough foobar?
> Do I have to recompile bind after such an adjustment?
> Should I tweak something else?

Usual question:
- did you build named with a large value of FD_SETSIZE?
ANSWER: No. I'm not even sure how to change it. Would I edit lib/isc/unix/socket.c? Should I change it?

- did you specify a reasonably large value for max-cache-size?
ANSWER: I have "max-cache-size 0 ;" I thought you, or a fellow isc person, said this would mean bind would regulate the size as it did in previous versions. Correct? Do you another suggestion?

- how many sockets were actually opened when you saw this message?
ANSWER: What is the best method to measure and capture this? lsof, pfiles, or ?

And you may also want to check the OS capability with this tool:
http://www.jinmei.org/selecttest.tgz

ANSWER: Done and the output is below. What do you think?
# ./selecttest
selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
opening 2046th socket failed: Too many open files
# ulimit -a
core file size (blocks)     1000000
data seg size (kbytes)      unlimited
file size (blocks)          unlimited
open files                  2048
pipe size (512 bytes)       10
stack size (kbytes)         8192
cpu time (seconds)          unlimited
max user processes          29995
virtual memory (kbytes)     unlimited
# ./selecttest -r
selecttest: nsocks = 4093, TEST_FDSETSIZE = -1, FD_SETSIZE = 1024, sizeof fd_set = 128
created 4093 sockets, maxfd = 4095
FD_CLR test...OK
FD_SET test...OK
select: Invalid argument
select test...
# grep rlim /etc/system
set rlim_fd_max=4096
set rlim_fd_cur=2048
#

Interesting that when "-r" was used, select failed but the higher FD limit was recognized. Not sure how to interpret this.

---
JINMEI, Tatuya
Internet Systems Consortium, Inc.