× The internal search function is temporarily non-functional. The current search engine is no longer viable and we are researching alternatives.
As a stop gap measure, we are using Google's custom search engine service.
If you know of an easy to use, open source, search engine ... please contact support@midrange.com.


  • Subject: Re: how is system geared down?
  • From: "Alexei Pytel" <pytel@xxxxxxxxxx>
  • Date: Fri, 11 May 2001 11:43:54 -0500


Sorry, Steve

I reread your note and realized that I misunderstood what you've said in
your note...
Yes, if CPU chip is the same, then very CPU bound program with a tight loop
(it's important - cache!) should perform the same regardless of CPW rating.
To ensure tight loop, do not use BIFs/subroutines/procedures etc.

    Alexei Pytel

Disclaimer:
     Opinions exressed here are entirely of my own and may or may not
represent my employer's position.




                                                                                
                   
                    Alexei                                                      
                   
                    Pytel/Rochester/IBM       To:     MIDRANGE-L@midrange.com   
                   
                    @IBMUS                    cc:                               
                   
                    Sent by:                  Subject:     Re: how is system 
geared down?          
                    owner-midrange-l@mi                                         
                   
                    drange.com                                                  
                   
                                                                                
                   
                                                                                
                   
                    05/11/2001 10:42 AM                                         
                   
                    Please respond to                                           
                   
                    MIDRANGE-L                                                  
                   
                                                                                
                   
                                                                                
                   




You misintrepret my words.
I did *not* say that *this* test in RPG will run with the same speed even
if number of repetitions is increased.
What I said was that since in this test the function is applied to the same
constant string every time, the smart compiler *may* eliminate this loop
and replace it with a single statement.

for example (in pseudocode):
          for i = 1 to 1000000
               x = 5;
is equivalent to a single statement
          x = 5;

I did *not* say that RPG compiler can do this - I am not familiar enough
with it to make such statements.
But I did see similar setups used to demonstrate how Java program can run
100 times faster then equivalent RPG program.

This does not have very much relation to real life, because one rarely does
this kind of things in real applications - I hope.

About IBM comissars - I do not represent IBM in any way.
I think I should start include this statement in all my notes now:

Disclaimer:
     Opinions exressed here are entirely of my own and may or may not
represent my employer's position.

Best regards
    Alexei Pytel

"Pessimist is nothing but a well-informed optimist"





                    "Steve Richter"

                    <srichter@AutoCoder       To:
<MIDRANGE-L@midrange.com>
                    .com>                     cc:

                    Sent by:                  Subject:     Re: how is
system geared down?
                    owner-midrange-l@mi

                    drange.com



                    05/10/2001 11:31 PM

                    Please respond to

                    MIDRANGE-L






nice link to the power pc site.

In my view, speculating on this subject is worthwhile because it increases
technical understanding of the system.

I think the next step is to test alexei's assertion that a very cpu bound
pgm, say an rpg pgm that counts to 1 trillion, will execute in the same
amount of time on as400's with very different cpw ratings but the same cpu.

Alexei may himself be geared down in what he is allowed to say by the
commisars at ibm, but I would be very suprised if what he does say is not
true.

Steve



+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to
MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator:
david@midrange.com
+---




+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to
MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator:
david@midrange.com
+---




+---
| This is the Midrange System Mailing List!
| To submit a new message, send your mail to MIDRANGE-L@midrange.com.
| To subscribe to this list send email to MIDRANGE-L-SUB@midrange.com.
| To unsubscribe from this list send email to MIDRANGE-L-UNSUB@midrange.com.
| Questions should be directed to the list owner/operator: david@midrange.com
+---

As an Amazon Associate we earn from qualifying purchases.

This thread ...


Follow On AppleNews
Return to Archive home page | Return to MIDRANGE.COM home page

This mailing list archive is Copyright 1997-2024 by midrange.com and David Gibbs as a compilation work. Use of the archive is restricted to research of a business or technical nature. Any other uses are prohibited. Full details are available on our policy page. If you have questions about this, please contact [javascript protected email address].

Operating expenses for this site are earned using the Amazon Associate program and Google Adsense.