🚀 go-pugleaf

In article <1993Jan7.121038.4845@odin.corp.sgi.com>, jpp@pipo.paris.sgi.com (Jean-Pierre Panziera - SGI PARIS) writes...
>  I am not familiar with "Alpha's process cycle counter". Is this a simulator ?
>  Does this tool take in account eventual cache misses ?
>  How do real benchmark compare with your simulation ?

It's in the hardware.

From page 4-118, Alpha Architecture Reference Manual (description of 
RPCC - read process cycle counter):  

	The low order 32 bits of theprocess cycle counter is an unsigned
  	32 bit integer that increments once per N CPU cycles, where N is
 	an implementation-specific integer in the range 1-16.  The cycle
 	counter frequency is the number of times the process cycle counter 
	gets incremented per second, rounded to a 64 bit integer.  The
	integer count wraps to 0 from a count of FFFF FFFF.  The counter
	wraps no more frequently than 1.5 times the implementation's 
	interval clock interrupt period (whichi s two thirds of the
	interval clock interrupt frequency).  The high-order 32 bits of the
	process cycle counter are an offset that when added to the low-order 
	32 bits gives the cycle count for this process.

	The process cycle counter is suitable for timing intervals on the 
	order of nanoseconds and may be used for detailed performance
	characterization.  It is required on all implementations.  PCC is
	required for every processor, and each processor in a multiprocessor
	system has its own PCC.  

There is also a 'system cycle counter'.

> 
>|> The algorithm is a radix-4 algorithm, and is basically just a C translation
>|> of the FORTRAN code in "DFT/FFT and Convolution Algorithms" by Burrus and 
>|> Parks (with a few tweaks, of course).
> 
>  Are the results of your transform ordered, or are they "bit reversed" ?
> 
>Thanks you in advance.
> 
>---
>    ___   ___/       ___   /       ___   /	Jean-Pierre Panziera
>         /          /     /       /     /	jpp@paris.sgi.com
>        /          ______/       ______/	
>       /          /             /		
> _____/       ___/          ___/		
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Matthew Kirk				  	     kirk@tallis.enet.dec.com

All opinions expressed here are mine and do not reflect those of Digital
Equipment Corporation.
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