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Re: st: Stata MP performance


From   Alfonso Miranda <A.Miranda@ioe.ac.uk>
To   Statalist <statalist@hsphsun2.harvard.edu>
Subject   Re: st: Stata MP performance
Date   Mon, 26 Jul 2010 17:12:43 +0100

Dear Jeph,

Yes,  I did.

Best,

A

On 26/07/2010 16:48, "Jeph Herrin" <stata@spandrel.net> wrote:

> Are you allocating the same amount of RAM in both cases?  It has
> been noted before on this list that allocating excessive RAM slows down
> calculations, and allocating 40GB RAM will slow  things down
> significantly compared with allocating 2GB for the same job.
> 
> On 7/26/2010 9:10 AM, Alfonso Miranda wrote:
>> Dear All,
>> 
>> I just notice something strange about Stata/MP performance. I have access to
>> two different systems:
>> 
>> SYSTEM 1 (Desktop)
>> - Hardware: Mac Pro computer with 2 Quad-Core Intel Xeon processors (2.8
>> GHz, 12 MB L2 Cache per processor, 1.6 GHz Bus Speed), and 4 GB in memory.
>> 
>> - Operating system: Mac OS X 10.5.8 (Leopard).
>> 
>> - Stata Stata/SE 11.1 for Mac (64-bit Intel).
>> 
>> 
>> SYSTEM 2 (MP Server)
>> - Hardware: Dell PowerEdge R900 with 2 x 6 core Xeon X7460 (2.6GHz, 16MB L3
>> cache, 1066MHz FSB, 130W TDP) 64GB memory ((16x4GB Dual Rank DIMMs) 667MHz
>> FDB) The OS and page file are running on RAID1 2x300GB SAS 15k 3.5" disks
>> run by a PERC 6/I internal RAID controller.
>> 
>> The data (F and G drives) are sitting on an MD3000 external SAS array, which
>> contains a RAID1 implementation of 4 x 1TB SATA II 7.2K 3.5 inch HD
>> 
>> - Operating system: Windows 2008 (NOT R2), including all latest critical
>> security patches
>> 
>> - Stata / 8-core  MP for Windows (64bit x86-64)
>> 
>> 
>> I put a process in my Mac desktop and it takes 244.3750 seconds to conclude
>> (i.e., around 4min). Running the same process (same programme + same data)
>> in my MP server takes 717.7790 seconds to conclude (I.e., around 12min). In
>> other words, Stata/MP with 8 processors on SRC1 is at the moment 3 times
>> slower than my Stata/SE in my Mac desktop, which I understand can only
>> exploit the resources of a single core. This is strange indeed.
>> 
>> Have you experience something similar?
>> 
>> Any comments?
>> 
>> Best wishes,
>> 
>> Alfonso.
>> 
>> 
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