| Re: Poor comparable performance for IDL on Solaris vs Vista or Snow Leopard [message #69931] |
Tue, 23 February 2010 13:37  |
demian
Messages: 2
Registered: February 2010
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Junior Member |
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Liam,
Thanks for the response. The CPUs in the Solaris 8 system (v480) are:
UltraSPARC III (http://en.wikipedia.org/wiki/UltraSPARC_III_Cu) ,
these have two ALUs and two FPUs, with different tasks.
The CPUs in the Solaris 10 system (T5240) are UltraSPARC T2 Plus
(http://en.wikipedia.org/wiki/UltraSPARC_T2). The 5240 is a two-way
SMP server, with one FPU per core and 8 threads per core handled
concurrently. This system can handle 128 threads concurrently.
I can see how the UltraSPARC III, my not compete, but the
UltraSPARC_T2 certainly should....
Does IDL take advantage of Sun's multi-threading?
Thanks,
Demian
On Feb 22, 10:36 am, Liam Gumley <liamgum...@gmail.com> wrote:
> On Feb 22, 11:15 am, demian <demian.ha...@gmail.com> wrote:
>
>> Both servers are largely quiet and have most cycles available for user
>> processing. One server has 4 ~1GHz processors, 32GB of RAM and runs
>> Solaris 8. The other server has 4, 8core ~1GHz processors, 64GB of RAM
>> and runs Solaris 10. We’ve tested to see if there is a performance
>> difference between local vs SAN storage on these servers and cannot
>> explain the difference.
>
> If the Sun servers have T1 processors, then slow IDL performance
> should be expected, since a single floating point unit (FPU) is shared
> by all processor cores:
>
> http://en.wikipedia.org/wiki/UltraSPARC_T1#Target_market
>
> I would not expect a Sun server based on 1GHz CPUs to be as fast as a
> 3GHz Mac. Is multi-threading enabled on the Sun servers? Even if it
> is, the FPU issue will severely hamper performance if they are indeed
> T1 servers.
>
> Cheers,
> Liam.
> Practical IDL Programminghttp://www.gumley.com/
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