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

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