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тАО09-15-2003 02:35 PM
тАО09-15-2003 02:35 PM
32 vs 64 bit
If anyone has experience switching from 32 to 64 bit implementations of any application, please share any performance findings.
Thanks.
Johan
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тАО09-15-2003 05:26 PM
тАО09-15-2003 05:26 PM
Re: 32 vs 64 bit
A 64 bit system can address more physical memory as well.
We found our Oracle performance(hp-ux) went up substantially when we went to the 64 bit version, though some of the jump was due to the migration to the faster processor and 64 bit HP-UX.
Still the database peformed better.
I've seen situations were going to 64 bit OS slowed things down. That was when lots of little chunks of memory needed to be addressed. In that circumstance, there is a lot of wasted memory. The OS reads a bigger chunk of memory for a piece of data that is actually very small.
Additionaly sometimes the 64 bit versions of programs that applications vendors put out were done sloppily, not tested thoroughly and simply ran like dogs.
SEP
Owner of ISN Corporation
http://isnamerica.com
http://hpuxconsulting.com
Sponsor: http://hpux.ws
Twitter: http://twitter.com/hpuxlinux
Founder http://newdatacloud.com
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тАО09-15-2003 05:43 PM
тАО09-15-2003 05:43 PM
Re: 32 vs 64 bit
Wider bus, more data per clock cycle.
As for how this improoves on things, it really is on a application by application basis.
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тАО09-15-2003 09:40 PM
тАО09-15-2003 09:40 PM
Re: 32 vs 64 bit
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тАО09-17-2003 07:54 AM
тАО09-17-2003 07:54 AM
Re: 32 vs 64 bit
It would still take the same number of clock cycles *or more* to process 64bits instead of 32bits.
Or, in other words: ALL of the performance gains SEP saw were due to switching processors. Going from a 32bit PA chip to a 64bit PA chip increases the clock speed, the cache, pipeline code, TLB size, etc. Just moving to 64bit code without changing anything else will slow your code down.