Re: RPG & Teraspace Storage Model

Do you know that you don't have to write to disk?

1. Create a directory like:

mkdir /home/fifiles/

2. Create a User Defined File System. This is permanent.

CRTUDFS UDFS('/dev/QASP01/MyFile.tmpudfs')

3. Mount the file on the temp UDF. This is temporary until the next IPL.

ADDMFS TYPE(*UDFS)MFS(‘/dev/QASP01/MyUSDF.TMPUDFS’)
MNTOVRDIR('/home/fifiles')


You now have user defined file system. Because it is temporary, the OS
creates the file system in memory.


So you are reading and writing from memory. You just write to the IFS like
any other Unix file but it is memory and not written to disk.


The only catch is that you need to put the above instruction in your
startup program to do the mount as every time you IPL, it goes away.






On Wed, Nov 15, 2017 at 2:08 PM, <dlclark@xxxxxxxxxxxxxxxx> wrote:

"RPG400-L" <rpg400-l-bounces@xxxxxxxxxxxx> wrote on 11/15/2017 05:05:35
PM:

I am puzzled by this project. It seems like you are building some huge
string in memory.

Couldn't you simply write the string as you build it to an IFS file and
send from the file?

Not clear to me why you have to build in memory.

That may work in some cases. But I can tell you that was a severe
performance drain for us. Writing to the IFS as temporary storage is not
the most performance friendly prospect. Again... Not for us, at least.

Sincerely,

Dave Clark
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