Re: Teraspace memory allocation

[David & Eileen Keck <bstars@xxxxxxxxxxxxx>]

Not knowing what the application was I didn't bother to go into performance
... I just didn't like the idea that sharing teraspace across jobs couldn't
be done.  However, allocating work to a server job can sometimes improve
performance ... kind of like multithreading.  Also, I didn't know your app
needed the whole teraspace returned as a result set.  I don't know what your
application needs to do with the whole teraspace, but for some applications,
the teraspace intensive processes could be done in batch (where cycles are
cheap) by the daemon.  -Dave K.

----- Original Message -----
From: "Walden H. Leverich" <WaldenL@TechSoftInc.com>
To: <midrange-l@midrange.com>
Sent: Wednesday, December 26, 2001 2:14 PM
Subject: RE: Teraspace memory allocation


> OK, if I understand you correctly it would _technically_ work, but I
> wouldn't want to use it. Here's why:
>
> 1) If I'm doing memory allocations I might (probably am?) interested in
> performance, and while data queues aren't slow they're a hell of a lot
> slower than memory IOs.
>
> 2) If I'm using teraspace instead of "normal" space then I'm probably also
> interested in allocations > 16Meg. Given that there is a 16Meg limit on a
> dataq I'd hit a problem there too.
>
> -Walden
>
> ------------
> Walden H Leverich III
> President
> Tech Software
> (516)627-3800 x11
> WaldenL@TechSoftInc.com
> http://www.TechSoftInc.com
>
>
>
> -----Original Message-----
> From: David & Eileen Keck [mailto:bstars@optonline.net]
> Sent: Wednesday, December 26, 2001 13:32
> To: midrange-l@midrange.com
> Subject: Re: Teraspace memory allocation
>
>
> Walden,
>     I understand that teraspace can not be directly shared across multiple
> jobs, but that's really not much of an impediment to sharing teraspace.
You
> just do it indirectly.  If you create a job which allocates an instance of
> teraspace, and this job runs in batch as a daemon, it can provide shared
> access to common teraspace across all other jobs in your system.  Other
jobs
> can communicate with the Teraspace Server via two data queues.  One to
send
> requests to the server, the other to send result sets back to the client.
A
> request to the server could contain a function code, a handle, and data.
The
> result would be just handle and data.  The handle/address cross reference
> could be stored in an array or based data structure in the server program,
> and the cookie/handle would be the array pointer or based data structure
> offset, depending on which way you went.  Why wouldn't such a mechanism
work
> ?  -Dave K.
>
> ----- Original Message -----
> From: "Walden H. Leverich" <WaldenL@TechSoftInc.com>
> To: <midrange-l@midrange.com>
> Sent: Wednesday, December 26, 2001 12:00 PM
> Subject: RE: Teraspace memory allocation
>
>
> > Dave,
> >
> > Actually, the manual says teraspace allocations are valid only in the
> > job that does the allocation, if you want to share the allocations
> > then you
> need
> > to deal with the share memory apis. Now, if you are referencing
> > teraspace with a space pointer I'm not sure how that would play out,
> > on one hand teraspace is only valid in the job that allocates it, on
> > the other hand a space pointer is a space pointer from any job.
> >
> > -Walden
> >
> > ------------
> > Walden H Leverich III
> > President
> > Tech Software
> > (516)627-3800 x11
> > WaldenL@TechSoftInc.com
> > http://www.TechSoftInc.com
> >
> >
> >
> > -----Original Message-----
> > From: David & Eileen Keck [mailto:bstars@optonline.net]
> > Sent: Monday, December 24, 2001 11:11
> > To: midrange-l@midrange.com
> > Subject: Re: Teraspace memory allocation
> >
> >
> > I beg to differ.  As I suggested in a previous post on this topic, a
> > Teraspace Server process could be set up as a daemon.  From a design
> > point of view, mutiple jobs can certainly share the same teraspace by
> referencing
> > the same handle / cookie. Dave K.
> >
> > ----- Original Message -----
> > From: "Simon Coulter" <shc@flybynight.com.au>
> > To: <midrange-l@midrange.com>
> > Sent: Saturday, December 22, 2001 10:08 PM
> > Subject: Re: Teraspace memory allocation
> >
> > ----snip ----------
> > >  TS exists only
> > > for the duration of a job/process thus a handle cannot be stored
> > externally
> > > to the process and reused in a different process.
> > ----snip-----------
> >
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