How to speed up record I/O?

Hi,

My name is Mike Amos and, several years ago, I was reasonably proficient 
at MI programming. The past several years, with C/400 and then ILE-C, I 
have had no need to use anything other than the provided APIs and MI 
calls supported directly via ILE-C. Today, however, I need to speed up 
read/write - esp. reads - for record IO. I know that the IBM FTP program 
does reads much faster than the provided record IO interfaces because 
FTP reads and sends my 300MB test file twice as fast as I can read it. I 
have tried every reasonable combination of _Rreadx, read() and fread() 
that I can think of using both native and IFS interfaces and compiler 
options.

I have a few questions:

1. Has anyone found that MI calls to the IO functions, QSYS/QGETDBx, 
etc. can be safely done using in user state at security level 50?

2. Does anyone have any experience regarding faster record IO methods 
such as use of RPG, MI or any ideas?

3. Accessing the system table to make the calls is not a problem for me, 
but I have not been able to find documentation for the IO control 
block/file control block/other control block definitions needed to set 
up the IO.

Mike Amos (MrA)

P.S. I have also posted appropriate questions regarding this same topic 
in other news groups including the midrange C400-L group. If there are 
any other groups that I should post to, please let me know as I am new 
to midrange.com.

P.S.S I was doing my technical posts via the IBM 400 news groups that 
are now taken down.
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