Re: How are CPU Speed and Overall CPW Related?

[Vance Stanley <w_vance_stanley@xxxxxxxxx>]

Nathan, 
 It may very well be that fox pro on the lap top is
much faster with one user. Consider the application in
terms of number of users needing to access it and then
the OS/400 side will be more competitive.

--- "Nathan M. Andelin" <nathanma@haaga.com> wrote:
> I'm devoted to OS/400.  I build OS/400 based
> applications for people.  My
> current focus is Web development.  I'd like my
> applications to be able to
> compete against their Windows counterparts.  But my
> customers are faced with
> a dilemma.  I'll try to illustrate with an example:
> 
>  D theString       S             50A
>  D theShorter      S             50A   Inz('TEST
> STRING')
>  D nbr             S             10I 0
>  D Secs            S             10I 0
> 
>  D Now             S               Z
>  D Then            S               Z
> 
>  C                   Time                    Then
> 
>  C                   Do        100000        nbr
>  C                   Eval      theString =
> %trim(theShorter)
>  C                   EndDo
> 
>  C                   Time                    Now
> 
> C     Now           Subdur    Then          Secs:*MS
> 
> C     Secs          Dsply
> 
> C                   SetOn                           
>             LR
> C                   Return
> 
> This simple program displays the number of
> milliseconds required TRIM blanks
> from a 50 byte string and assign the result to
> another string variable -
> 100,000 times.
> 
> Let's take a look at an equivalent program, written
> in Visual Foxpro, and
> running under Windows:
> 
> theString = space(50)
> theShorter = 'TEST STRING'
> theShorter = theShorter + space(50 -
> len(theShorter))
> 
> then = seconds()
> 
> for i = 1 to 100000
>   theString = alltrim(theShorter)
> endfor
> 
> now = seconds()
> 
> ? now - then
> 
> It takes 2095 MS to run the RPG code on my AS/400. 
> But it only takes 365 MS
> to run the Foxpro code on my Laptop.  The Foxpro
> program offers 5.74 times
> better performance.  But Foxpro is not faster than
> RPG.  The difference is
> in the computer hardware.
> 
> My Laptop CPU offers a 330 Mhz clockspeed.  My
> AS/400 offers a 200 Mhz
> clockspeed.  That explains a small part of Foxpro's
> superior performance.  I
> believe the more meaningful difference is that
> AS/400 CPU is not fully
> utilized.
> 
> Alexei Pytel gave me a hint that jogged my memory. 
> Some time ago, I read
> that CPU throughput was governed largely by cache -
> not only clockspeed.  My
> theory is that Rochester governs CPU throughput via
> processor cache.
> 
> A Midrange Computing chart shows that the same 200
> Mhz Northstar processor
> offers a CPW range of between 50 and 220.  Actually
> a 100 Mhz Apache
> processor offers a CPW of 210.  This indicates that
> a lowly 100 Mhz
> processor is capable of running my CPU bound RPG
> program 3 times faster than
> my 200 Mhz processor.
> 
> Is "64 bit RISC" meaningful?  Is "silicon on wafer"
> meaningful?  Not if you
> put a governor on the CPU.  Or, should I say, not if
> you withhold processor
> cache?
> 
> Bottom line.  Web applications do large amounts of
> string handling.  And
> that requires large amounts of CPU time.  Why not
> unbridle the AS/400 CPU?
> Otherwise, Joe Foxpro, VB, Delphi, and C Sharp
> programmer is going to kill
> me.
> 
> Nathan.
> 
> 
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