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Full Discussion: Solaris SPARC speed issue
Operating Systems Solaris Solaris SPARC speed issue Post 302699069 by jlliagre on Tuesday 11th of September 2012 05:19:50 AM
Old 09-11-2012
Quote:
Originally Posted by Pug
1. 'hergp' is saying that if the issue is that they are using a T1 T2 type multi core SPARC than the issue is not so much the 32 vs 64 bit compile as it is the single threaded vs multi-threaded processing. Correct?
Yes.
Quote:
On Windows x86 vs X64 we found that the increase in compiling to X64 is just under 20% (comparing the running of one process on the same input data). Would you expect something similar on SPARC?
No. The gain observed when moving from x86 to x64 is generally due to the small number of registers available on x86 vs the larger one on x64. SPARC 32 bit doesn't have this deficiency.
Quote:
2. 'jlliagreis' saying that if it is possible to design our program to be multi-threaded (which I don't think we can) or if we run the program in parallel processes on different sets of data instead of in sequence, then we should be able to see some improvement. However, the amount will depend on the type of bottle neck we are experiencing (which we do not know yet). So for example, if it is straight CPU bound then we should see the best improvement, whereas if it is I/O bound then they may be less improvement, etc.
Currently, your process is likely CPU bound otherwise you wouldn't have open this thread in the first place.
Quote:
3. How do I know if we are running T1 or T2 with regard to floating point? I noticed that you said it is niagara based on the sun4v. How do I tell what T level they have?
Run
Code:
psrinfo -pv
prtdiag -v

to get the CPU model you have.
Quote:
4. What Solaris SPARC hardware would be better for doing this type of processing? I am not sure we have a choice but I am certainly curious.
SPARC64, T2+, T4
Quote:
One other things. They have two servers. One is a T2 and the other a T3 and specifically they are:SunOS 5.10 Generic_147440-09 sun4u sparc SUNW,Sun-Fire-V245 (T2)
SunOS 5.10 Generic_147440-01 sun4v sparc sun4v (T3)
The V245 is not a T2, it uses a single thread, single core CPU.
Quote:
What does this tell us about single thread / multi-thread or floating point etc?
Use psrinfo -pv to see what kind of CPU it is.
Quote:
How does sun4v differ from sun4u?
sun4v is CMT (chip multi-threading)
sun4u = UltraSPARC I, II, III, IV, IV+, SPARC64
sun4v = UltraSPARC T1, T2, T2+, T4
See Category:SPARC microprocessors - Wikipedia, the free encyclopedia for details on each model.
 

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