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CCP4BB  April 2012

CCP4BB April 2012

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Subject:

Re: Who is using 64-bit Linux?

From:

Tim Gruene <[log in to unmask]>

Reply-To:

Tim Gruene <[log in to unmask]>

Date:

Wed, 4 Apr 2012 11:09:26 +0200

Content-Type:

text/plain

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Parts/Attachments

text/plain (104 lines)

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

Hi Tom,

because there are PCs out there with more than 200GB RAM, as well as
programs and systems that make use of them. As far as I understand a
32-bit compiled kernel would have not possibility to address anything
beyong 4GB.

Regards,
Tim

On 04/04/12 10:53, Tom Peat wrote:
> Hello Tim,
> 
> I believe the notion comes about as one can thread 64 instead of 32 addresses concurrently, thereby boosting performance.  If it has no performance boost, why would they bother? 
> 
> Cheers, tom
> 
> -----Original Message-----
> From: Tim Gruene [mailto:[log in to unmask]] 
> Sent: Wednesday, 4 April 2012 6:43 PM
> To: Peat, Tom (CMSE, Parkville)
> Cc: [log in to unmask]
> Subject: Re: [ccp4bb] Who is using 64-bit Linux?
> 
> Dear Tom,
> 
> 64-bit is about memory addressing - why would you expect a performance
> boost? I have wondered where this notion originated from.
> 
> Cheers,
> Tim
> 
> On 04/03/12 22:07, Tom Peat wrote:
>> We use the 64 bit Centos (Red Hat) distro and CCP4, Coot, etc seem to work fine on this. 
>> I can't say I notice a big performance boost from the 64 bit side of things. 
>> Maybe I'm just impatient. 
>> cheers, tom
> 
> 
>> Tom Peat
>> Biophysics Group
>> CSIRO, CMSE
>> 343 Royal Parade
>> Parkville, VIC, 3052
>> +613 9662 7304
>> +614 57 539 419
>> [log in to unmask]
>> ________________________________________
>> From: CCP4 bulletin board [[log in to unmask]] On Behalf Of Roger Rowlett [[log in to unmask]]
>> Sent: Wednesday, April 04, 2012 5:57 AM
>> To: [log in to unmask]
>> Subject: [ccp4bb] Who is using 64-bit Linux?
> 
>> The time has come for me to upgrade my Linux OS to something more recent
>> for me and my student workstations. A 32-bit distro is certainly
>> conservative and compatible with CCP4 and Coot, but it seems like that
>> solution hobbles my hardware and puts some limitations on available
>> memory, even with PAE enabled. So who is using a 64-bit distro these
>> days, and are there lingering issues of compatibility and dependency
>> hell with commonly used XRD software, like CCP4, Coot, iMOSFLM etc.?
> 
>> Ubuntu 12.04 LTS (beta) actually works OK with one simple workaround for
>> the global menu for CCP4 and Coot, and wine compatibility is fine for
>> running CrysalisPro in the same environment, so it's really comes down
>> to whether or not the extra performance of a 64-bit OS is worth the pain
>> of compatibility issues for XRD software. Any thoughts?
> 
>> Cheers,
> 
>> _______________________________________
>> Roger S. Rowlett
>> Gordon & Dorothy Kline Professor
>> Department of Chemistry
>> Colgate University
>> 13 Oak Drive
>> Hamilton, NY 13346
> 
>> tel: (315)-228-7245
>> ofc: (315)-228-7395
>> fax: (315)-228-7935
>> email: [log in to unmask]
> 
> 

- -- 
- --
Dr Tim Gruene
Institut fuer anorganische Chemie
Tammannstr. 4
D-37077 Goettingen

GPG Key ID = A46BEE1A

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