Re: [squid-users] for FAQ: diskd on AIX

Hello Gerard,

your "beautified" version is very fine.

Actually, i have to admit, i tried to make it into the FAQ some time in
the past with the "maxdata" solution. However i never got any reaction
as a result to this post:
http://www.squid-cache.org/mail-archive/squid-users/200103/0238.html
(Posting it to the list however is still helpful as google finds it.)

Maybe your summary has better chances.

Best Regards

Matthias Weigel

Gerard Eviston wrote:

>IMHO your notes are very helpful.
>
>To help get it into the FAQ I've tried to summarise your comments. Also I
>couldn't resist the chance to sneak in one of my own :-). I haven't actually
>tested the LDR_CNTRL solution though.
>
>Matthias - have I represented you correctly?
>
>Henrik / FAQ maintainer - can this go in the FAQ?
>
>Regard
>Gerard
>
>----
>
>System-Dependant Wierdness
>
>14.9 AIX
>
>"shmat failed" errors with diskd
>
>32-bit processes on AIX 4.2.1 and later are restricted by default to a maximum
>of 11 shared memory segments. This restriction can be removed by setting the
>environment variable EXTSHM=ON in the script or shell which starts squid.
>
>Core dumps when squid process grows to 256MB
>
>32-bit processes cannot use more than 256MB of stack and data in the default
>memory model. To force the loader to use large address space for squid,
>either:
> o set LDR_CNTRL environment variable, eg LDR_CNTRL="MAXDATA=0x80000000"; or
> o link with -bmaxdata:0x80000000; or
> o patch the squid binary
>See
>http://publibn.boulder.ibm.com/doc_link/en_US/a_doc_lib/aixprggd/genprogc/lrg_prg_support.htm
>for more information, including how to patch an already-compiled program.
>
>----
>
>On Fri, 24 Jan 2003 19:41, Matthias Weigel wrote:
>
>
>>Hello squid-users,
>>
>>when using squid with diskd, certain semaphore and messagequeue limits
>>must be set to make squid happy. See the FAQs diskd section for details.
>>On AIX you cannot modify these limits (at least i could not find out how
>>to do it).
>>When you try to start squid with "cache_dir diskd" entries in
>>squid.conf, squid crashes with the following error in cache.log:
>>[...]
>>"shmat failed".
>>
>>The Fix:
>>set the following environment variable in your startup script or in
>>RunCache script:
>>EXTSHM=ON
>>export EXTSHM
>>This modifies some AIX shared memory policy to be more flexible. See
>>"man shmat" for details.
>>After setting this environment variable, squid is running fine for me
>>with diskd on AIX.
>>This was tested on AIX 4.3.3 on a 32bit processor but probably applies
>>to other versions as well.
>>
>>Hope this is helpful.
>>
>>Best Regards
>>
>>Matthias Weigel
>>ISOnova GmbH
>>
>>
>
>.
>
>
>
Received on Fri Jan 24 2003 - 10:35:40 MST