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viljoens at verishare....
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Posted: Tue Aug 11, 2015 4:01 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

Quote:

Anybody else ran into this?

Quote:

No, but I would ask myself why so many file descriptors are being used.
It sounds like you have a file descriptor leak (not being closed when
finished with).

Hi Tony

Thanks for replying.

I suspected something like that, though repeatedly running

lsof | wc -l

Always stays quite low - 100 000 open files, which is still 8 times less
than the system maximum as confirmed by running ulimit -n

I also note that this number will increase to about 125 000 but never go
higher than that, then, as calls hang up, decreate again - during times when
the CLI is spammed with 100s of "broken pipe" errors due to insuffiecient
file descriptors, this number never reaches beyond 125 000 out of the
available 800 000 open files.

Quote:

You might also want to look at the output of lsof (or at least some of it)
to see what all these file descriptors are pointing to, and whether it is
indeed Asterisk that is consuming them.

If I grep by asterisk on the output of lsof the few thousand lines I have
looked at all seem to indicate legitimate uses - there are at least two
files for each conversation in progress (I assume for inward and outward
RTP) plus one for each file being mixmonitored (which also seems logical)
and also number-of-active-calls connections to res_timing_dahdi - which all
looks correct...

Quote:

If it is Asterisk, it's quite possible, even probable, that such a leak
has been found and fixed, even in the 1.8 series. 1.8.11.0 is rather old -
the latest is 1.8.32.3, so it would be best to update to that version and
see if the problem persists.

Ok, I will have to consider that. The thing is the problem is not consistent
- I can (for example) run 60 calls, with no problems and no reported
failures in opening files, then calls will -decrease- to about 40 and then
later spike to 70, but around 50 calls I get the errors coming up thousands
of times in the CLI, then suddenly stop as the calls -increase- which
doesn't make sense. But this kind of behaviour does seem consistent with a
possible leak.

SOMETHING NEW

I have now ran

/usr/bin/prlimit --pid `pidof asterisk`

and I have noticed that even though I have 800 000 files specified, the
ACTUAL limit in place on Asterisk for numbers of files is only 1024?!

# prlimit --pid `pidof asterisk`
RESOURCE DESCRIPTION SOFT HARD UNITS
AS address space limit unlimited unlimited bytes
CORE max core file size unlimited unlimited blocks
CPU CPU time unlimited unlimited seconds
DATA max data size unlimited unlimited bytes
FSIZE max file size unlimited unlimited blocks
LOCKS max number of file locks held unlimited unlimited
MEMLOCK max locked-in-memory address space 65536 65536 bytes
MSGQUEUE max bytes in POSIX mqueues 819200 819200 bytes
NICE max nice prio allowed to raise 0 0
NOFILE max number of open files 1024 4096
NPROC max number of processes 30861 30861
RSS max resident set size unlimited unlimited pages
RTPRIO max real-time priority 0 0
RTTIME timeout for real-time tasks unlimited unlimited microsecs
SIGPENDING max number of pending signals 30861 30861
STACK max stack size 8388608 unlimited bytes

Accordingly I have put this into a cronjob ran each minute:

prlimit --pid `pidof asterisk` --nofile=786000:786000

to try and force the running binary to keep a high file limit (sources say
to keep it less than the ACTUAL system file limit, in my case 800 000 files)
on the live Asterisk process.

I'll see if this maybe helps - the above runs via cron each minute.

So it appears for some reason somehow the live running asterisk process
"loses track" of how many open files it may have, or when it starts it
somehow does not start with the correct number of maximum open files, as set
in the system / kernel config?

Anyway, thank you for replying, I'll monitor this new "Cronjob fixup" I'm
trying and see if it helps.

No wonder it is complaining about running out of file handles if it ACTUALLY
was only using 1024!

Kind regards

Stefan

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markus_weiler at mailw...
Guest

Posted: Tue Aug 11, 2015 11:29 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

Hi Stefan,

we ran into a similar problem using Debian.

There we are able to check the current limits using:

pidof asterisk -> 23351
cat /proc/23351/limits

Output:
Limit Soft Limit Hard Limit Units
Max open files 1024 1024 files

I think that in the end

/etc/security/limits.conf

* hard nofile 500000
* soft nofile 500000
root hard nofile 500000
root soft nofile 500000

did the trick. We also tried

vi /etc/sysctl.conf
fs.file-max = 500000

not sure what the solution in the end was. But I remember rebooting was
important.

Markus

Am 11.08.2015 um 11:00 schrieb Stefan Viljoen:

Quote:

Anybody else ran into this?

No, but I would ask myself why so many file descriptors are being used.
It sounds like you have a file descriptor leak (not being closed when
finished with).

Quote:

You might also want to look at the output of lsof (or at least some of it)
to see what all these file descriptors are pointing to, and whether it is
indeed Asterisk that is consuming them.

Quote:

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tony at softins.co.uk
Guest

Posted: Tue Aug 11, 2015 11:50 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

In article <002b01d0d414$36af31b0$a40d9510$@verishare.co.za>,
Stefan Viljoen <viljoens@verishare.co.za> wrote:

Quote:

Anybody else ran into this?

Quote:

No, but I would ask myself why so many file descriptors are being used.
It sounds like you have a file descriptor leak (not being closed when
finished with).

From what you said below, the above is probably not relevant...

Quote:

SOMETHING NEW

I have now ran

/usr/bin/prlimit --pid `pidof asterisk`

and I have noticed that even though I have 800 000 files specified, the
ACTUAL limit in place on Asterisk for numbers of files is only 1024?!

Yes, this is likely. Have a look in /usr/sbin/safe_asterisk, at the
commented-out settings for SYSMAXFILES and MAXFILES, and try setting those.

Cheers
Tony
--
Tony Mountifield
Work: tony@softins.co.uk - http://www.softins.co.uk
Play: tony@mountifield.org - http://tony.mountifield.org

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asterisk.org at sedwar...
Guest

Posted: Tue Aug 11, 2015 11:57 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

On Tue, 11 Aug 2015, Stefan Viljoen wrote:

Quote:

I suspected something like that, though repeatedly running

lsof | wc -l

Always stays quite low - 100 000 open files, which is still 8 times less
than the system maximum as confirmed by running ulimit -n

viljoens at verishare....
Guest

Posted: Wed Aug 12, 2015 2:07 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

Hi Steve

Just running about 50 calls??

If I do

lsof | grep asterisk | wc -l

to narrow the realm of what is reported I still get just under 100 000
files:

lsof | grep asterisk | wc -l
95903

with 50 calls running.

So apparently this is excessive? I can only guess that there must be a MAJOR
bug in 1.8.11.0 given that you are running 347 calls on 2161 open files with
Ast 11...?

I'm on Centos 7.

As I mentioned previously, I have found that my problem with Asterisk
running out of files is that the Asterisk binary, on startup, does NOT
"detect" that the open file limit it 768 000, it always selects 1024 as the
soft limit for open files and 4096 as the hard limit for open files. I have
to manually (cron does not work - wonder why?) do

/usr/bin/prlimit --pid `pidof asterisk` --nofile=786000:786000

in order to get the running Asterisk instance to ACTUALLY have a soft and
hard number of files limit of 786 000.

The machine under discussion never runs more than about 60 calls, at which
point it consumes about 125 000 file descriptors / handles in Asterisk
(total open files in the kernel goes to about 195 000) - I thought this was
normal....!

Note that besides some timer problems that pop up occassionally (unsure if
it is related) the box is totally stable and has spent days at 100 000+ open
file descriptors operating Asterisk 1.8.11.0 quite happily with no other
problems save that when the binary started up for that run it did not have a
sufficiently high file limit to actually work.

Thanks for the reply!

Kind regards,

Quote:

I suspected something like that, though repeatedly running

lsof | wc -l

Always stays quite low - 100 000 open files, which is still 8 times
less than the system maximum as confirmed by running ulimit -n

What the 'h' are you doing that takes x00,000 open files?

I'm running Asterisk 11.17.0 on CentOS 6.7 and my 'numbers' seem
insignificant by comparison.

sudo /usr/sbin/asterisk -r -x 'core show channels' | grep active
347 active channels
344 active calls

sudo lsof | wc -l
3945

sudo lsof | grep asterisk | wc -l
2161

--
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards sedwards@sedwards.com Voice: +1-760-468-3867 PST

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End of asterisk-users Digest, Vol 133, Issue 14
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jcolp at digium.com
Guest

Posted: Wed Aug 12, 2015 6:36 am Post subject: [asterisk-users] 786 000 files limit Centos 7 - Asterisk kee

On Wed, Aug 12, 2015, at 04:06 AM, Stefan Viljoen wrote:

Quote:

<snip>

I vaguely recall potential leaks that caused excess file descriptor
usage in older versions, but it's so old that it's hard to remember.
Just to provide some scope of how many changes there are between even
1.8.11.0 and 1.8:

✔ jcolp@electron:~/development/asterisk/public [11|⚑ 1]> git diff
1.8.11.0..1.8 | wc -l
221688

That's 221,688 changed lines.

--
Joshua Colp
Digium, Inc. | Senior Software Developer
445 Jan Davis Drive NW - Huntsville, AL 35806 - US
Check us out at: www.digium.com & www.asterisk.org

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