Re: lock_sga error

From: Tim Gorman <tim_at_evdbt.com>
Date: Fri, 05 Aug 2005 10:42:26 -0600
Message-ID: <BF18F312.2AB5F%tim@evdbt.com>

Magnus,

I was asking why you thought you wanted to get your shared memory to stay resident?

-Tim

on 8/3/05 1:28 PM, Magnus Andersen at Magnus.Andersen_at_WalkerFirst.com wrote:

> Thanks Kevin.  I wanted to get my shared memory to stay resident and I did
> implement hugtlb.  I am not using the indirect_data_buffers since I only have
> access to a 1.7 GB SGA at this point.
>  
> Magnus

>>
>> -----Original Message-----
>> From: Kevin Closson [mailto:kevinc_at_polyserve.com]
>> Sent: Wednesday, August 03, 2005 2:54 PM
>> To: Oracle-L (E-mail)
>> Subject: RE: lock_sga error
>>
>>
>> lock_sga is an OSD init.ora param...it only means something
>>
>> at the port level.. for instance lock_sga was implemented on the
>>
>> DYNIX/ptx port, but use_ism was implemented on Sol instead...
>>
>> Either way, the hope is that the OS complements this param
>>
>> with shared page tables and hard-locked SysV SHMEM...
>>
>> neither of which really related to Linux much.
>>
>>
>>
>> Are you sure you can boot of that init.ora file even with lock_sga
>>
>> commented out?
>>
>>
>>
>> Now, if you want your shared memory to stay resident (novel
>>
>> concept, I know, but it is a bit new to linux) you have to
>>
>> fiddle around with HUGE_TLB and so on. Also, if using
>>
>> indirect_data_buffers, you will need to use ramfs over
>>
>> shmfs because the latter is pageable ...
>>
>>
>>
>>
>>
>>

>>>  
>>>  
>>> 
>>>  From: oracle-l-bounce_at_freelists.org  [mailto:oracle-l-bounce_at_freelists.org]
>>> On Behalf Of Tim  Gorman
>>> Sent: Wednesday, August 03, 2005 9:09 AM
>>> To:  Oracle-L (E-mail)
>>> Subject: Re: lock_sga error
>>> 
>>>  
>>> Why do you want to  do this?
>>> 
>>> 
>>> 
>>> on 7/25/05 7:43 AM, Magnus Andersen at  Magnus.Andersen_at_WalkerFirst.com
>>> wrote:
>>> 
>>>  
>>>> Hi  All,
>>>>  
>>>> I'm trying to lock my sga in memory on a RedHat Linux 3  AS server.  When I
>>>> try to start the database with the "lock_sga=true"  paramerter in my init
>>>> file I get the following error:
>>>>  
>>>> SQL>  startup nomount;
>>>> 
>>>> ORA-27102: out of memory
>>>> 
>>>> Linux Error: 12:  Cannot allocate memory
>>>> 
>>>> SQL>
>>>> 
>>>> Any  ideas?
>>>> 
>>>> Thanks,
>>>> 
>>>> Magnus Andersen
>>>> Systems Administrator /  Oracle DBA
>>>> Walker & Associates,  Inc.
>>>>  
>>>> 
>>> 
> 

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Received on Fri Aug 05 2005 - 11:44:41 CDT