Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris
 
PerlMonks  

Re^4: Efficient code.

by Aristotle (Chancellor)
on Jan 30, 2006 at 20:56 UTC ( [id://526561]=note: print w/replies, xml ) Need Help??


in reply to Re^3: Efficient code.
in thread Efficient code.

Cool!

Old geezer moment: sometimes these optimisations make me feel like I did when I was writing assembly code (inner loops of texture mappers slinging pixels… unrolling carefully, rejoicing when a clever trick got your loop down from 11 to 9 cycles per pixel – those were the days) and went from Pentium to PentiumPro – suddenly it was no longer possible to measure how many clock cycles any one instruction took: an innocuous change somewhere up or down the line would sometimes dramatically change the time response of an unrelated instruction, occasionally a loop iteration would randomly take more or less cycles than average, and sometimes instructions would appear to take a fractional amount of cycles. It was like wading through quicksand.

Of course, there was no way to inspect the result of the PPro’s µ-Op translator. Thank goodness for use re 'debug'; :-)

Makeshifts last the longest.

Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Node Status?
node history
Node Type: note [id://526561]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others chilling in the Monastery: (4)
As of 2024-03-29 14:44 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found