Re: Shared Virtual Memory Question/Engine Shutdown
In article <5d9913$cq5@cssun.mathcs.emory.edu>, Mario Estrada
<marioestrada@guate.net> writes
>Hi Carol!
>
>Error 22, is a Unix error indicating hat an invalid argument has been passed,
>in DSA terms, it means that the shared memory requested by oninit
>cannot be allocated.
>
>1) It is not recommendable for your OnLine system to add virtual segments
> as if they were cookies :) , So your initial Virtual Segment must be
> enough to accomplish your normal operations.
>
>2) Your SUM is not correct, because SHMTOTAL will include the
> size of the RESIDENT , VIRTUAL and the COMMUNICATIONS portions
> of shared memory.
>
>3) Check your Kernel Parameters,
>
> SHMSEG is the maximum number of attached shared memory segments
> per process. ( DSA uses oninit to allocate more shared memory )
>
> SHMMAX is the operating system wide shared memory maximum segment
> size, (in bytes)
>
> SHMALL is the maximum amount of shared memory system wide
>
Also check the following kernel parameters.
HVMMLIM/SVMMLIM (Maximum amount of virtual memory allocated to a
process).
HDATLIM/SDATLIM (Maximum size of heap for a process in bytes).
HSTKLIM/SSTKLIM (Maximum size of stack segment for a process in bytes)
These apply on Pyramid/ICL DRS/NX and may or may not apply on your
platform. If not you may have
MAXUMEM or MAXMEM (Maximum amount of virtual memory allocated to a
process).
>4) Increase SHMTOTAL in your onconfig file or set it to zero ( 0 )
>
I always set if to 0 - I'd rather have Informix run slow and page/swap
rather than fail the operation requesting more memory.
>
>I hope this helps,
>
>
>Take care :)
>
And the same from me :-) )) (Double chin).
>----------------------------------------------------------------
>Mario Estrada / SISTECO, S.A.
>INFORMIX Suppor t / Fax (502) 3348447
>Department / Phone (502) 3340214
>----------------------------------------------------------------
>
>
--
David Williams