64-bit vs. 32-bit performance on SPARC hardware with the 1.6 JVM

I'm doing performance tuning for our Tomcat ckuster running on SPARC hardware. The 32-bit JVM gives us sufficient memory for now, but we are going to start using Terracotta for server striping so the extra memory the 64-bit JVM offers could be needed soon.
In addition to a bigger memory footprint, moving to the 64-bit JVM on SPARC has had a performance penalty. This FAQ shows a 10% - 20% performance hit when moving to the 64-bit JVM on SPARC on the 1.4 JVM:
http://java.sun.com/docs/hotspot/HotSpotFAQ.html#64bit_performance
I'm not interested in taking a 10% - 20% performance hit if I can avoid it. There's been discussion of using a 32-bit / 64-bit hybrid approach to avoid this problem so maybe the 1.6 JVM doesn't have the performance hit that the 1.4 JVM had:
http://blog.juma.me.uk/2008/10/14/32-bit-or-64-bit-jvm-how-about-a-hybrid/
Does anyone have current performance metrics for moving from the 32-bit JVM to the 64-bit JVM using the 1.6 JVM on SPARC?
Thanks.
Dean

Yes the 6380 FPU is shared between two cores. I just ran a diagnostic I made up that generates an array of 1 million random numbers, takes the average of those, and then excutes that repeatedly in a parallel loop. The 6380 showed a 20% to 30% improvement in speed between LV64 & LV32 bit depending on how many cores I told it to use. So that seems to make more sense. The other code that I was running that ran 4 times slower has a complicated clusters within a cluster structure including a large look up table array that is being passed around amoung several vi's. If it is moving that large amount of data around in memory, instead of just the pointer, that might explain it. But why then would the AMD run slower with 64 bit (by a factor of 4) when compared with the Core i7 which ran twice as fast, which kind of makes sense to me if it is moving that data around with twice the bandwidth?

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Copyright 2006 Sun Microsystems, Inc. All rights reserved.
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Moderator Comment:
Immediate response in this case is appreciated.No.
This is not company technical support.
If you want speedy assistance, use your contract credentials and log a support case.
No one here is paid to respond.
No one here is a company representative, nor are they responding as representatives of the company. There is no obligation that any inquiry get assistance, and your presumptive statement is bordering on being rude.

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I thought this was an interesting read and maybe some of you all here will too...
Part 1
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Part 2
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Merry Christmas everyone!

It's cool man. I just don't understand why Adobe wasn't more forthcoming, they we're quoted in the article as saying they recommend 64 OS with 8 gig memory for avchd yet you see that nowhere on the Adobe site.
Most people who use AVCHD cameras are consumer/prosumer types and telling them they need that they need such beefy computers to edit the format native might stop more than a few from buying premiere, that's all I was getting at. Also there's a great hatred for Vista out there (not me) and telling these non-pro's they need not just Vista but Vista 64 would turn more than a few people away. (The Red Camera whitepaper specifically says Vista 64, I think the generic 64bit comment was just meant to include Mac's OS, xp64 doesn't work nearly as well as Vista 64 in my experience)
It was the statement "This is why we recommend 64-bit systems for CS4" that got me. They didn't say 'helpful' they said 'recommended'. And judging by everyone's problems editing AVCHD on 32 OS I might even upgrade that to 'necessary'.
Then there's this:
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Consider the following workflow:
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That one paragraph is more helpful than anything on the Adobe site. Just wondering why they it took a call from a major magazine to clear this up. According to the tests in the article CS4's new dynamic link uses a good more RAM than in CS3. Little things like that are nice to know.
But, like I said it's all cool. You have to admit knowing all that would us out here on the user forum where we try to help other uses for to help them out. Does that make sense?
Happy holidays
Anyway didn't mean dust up anything with you Curt just speaking my mind. I'm really glad Adobe finally explained how everything works. Makes much more sense.
Thanks again for the links Eric. Might be the best present I got this Christmas.

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With those symptoms, I'd try the following document:
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The company upgraded using Windows 7 64-bit software. The system now seems to have some issues with program functionality (i.e. Word randomly closing when I try to click on a open document). And is very, very slow.
The company said that if the computer allowed them to load 64-bit software, than the computer was 64-bit compatible and it was the correct software to load.
Can anyone provide me with some insight/opinion into this?
Regards,
Diane
DA

If the processor didn't support the x86_64 architecture (quite possible for older Windows PCs), Windows 7 64-bit would fail to install or run. So that it's installed means you do have a processor supporting 64-bit software.
However, do you know how much RAM your PC has? Microsoft recommend at least 2 GB for the 64 bit edition of Windows 7, vs 1 GB for the 32-bit edition. Windows will allow installations with less and the result is usually poor performance. So if your PC has
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You might find this tidibit (from AnandTech) )interesting, Kappy:
"Why a 64-bit mode can actually be slower than a 32-bit counterpart
If all else is equal, a 64-bit MPU will be slower than its 32-bit equivalent. A study conducted by DEC found that, on average, compiling for 64bit programs decreases performance by 5%. This is because 64-bit address pointers occupy more space, resulting in higher data cache miss rates. In fact, 64-bit ISAs still support 64-bit addressing and 32-bit data operands, specifically to keep code size down and the miss rate penalty to a minimum; thus 32-bit integer data is still going to be used when the larger range of 64-bit integers are not needed.
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So it's not clear that going 64-bit, in and of itself, would yield any improvement in performance; it may well be worse in some cases (and your analogy might well be true, depending on the cache algorhythms and efficiency).
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So, as you allude, one has to be careful making performance estimates just based on a desciption of a processor being "32 bit" or "64 bit". We'll have to wait to see reasonable benchmarks between the Core Duo and the Core 2 Duo running a 64-bit OS before we'll really know what advantage, if any, there is.
Cheers.
Message was edited by: Dave Sawyer

64-bit LabVIEW - still major problems with large data sets

Hi Folks -
I have LabVIEW 2009 64-bit version running on a Win7 64-bit OS with Intel Xeon dual quad core processor, 16 gbyte RAM. With the release of this 64-bit version of LabVIEW, I expected to easily be able to handle x-ray computed tomography data sets in the 2 and 3-gbyte range in RAM since we now have access to all of the available RAM. But I am having major problems - sluggish (and stoppage) operation of the program, inability to perform certain operations, etc.
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Don

First, I want to add that this strategy works reasonably well for data sets in the 600 - 700 mbyte range with the 64-bit LabVIEW.
With LabVIEW 32-bit, I00 - 200 mbyte sets were about the limit before I experienced problems.
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I use the queuing strategy to move this large amount of data in RAM. We could have used other means such a LV2 globals. But the idea of clustering the 2-d array (image) and then having a series of those clustered arrays in an array (to see the final structure I showed in my diagram) versus using a 3-D array I believe even allowed me to get this far using RAM instead of recalling the images from disk.
I am sure data copies are being made - yes, the memory is ballooning to 15 gbyte. I probably need to have someone examine this code while I am explaining things to them live. This is a very large application, and a significant amount of time would be required to simplify it, and that might not allow us to duplicate the problem. In some of my applications, I use the in-place structure for indexing
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Can someone else comment on how data value references may help here, or how they have helped in one of their applications? Would the use of this eliminate copies? I currently have to wait for 64-bit version of the Advanced Signal Processing Toolkit for LabVIEW 2010 before I can move to LabVIEW 2010.
Don

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If I can get this working correctly it will save me a complete re-install. As hate to do that and then find same problem with the External Drive. AfAIK no problems with it formatted now and ready to go and no bad areas.
Has to be this continual bringing down of a driver and fact checking Windows cant find it on list of compatibles. Vendor says it is.

Thanks I had already run Check disc and contacted Toshiba and it has correct driver. Definitely a problem with the actual system disc.
I have also completed website asking for my model to be added to compatible sites and just have to hope seeing as no direct contact available, must be only company in the world that gets away with that.
Managed to work around the E/: problem by adding it to Libraries and then cut and pasted the whole date files and photos ready for new disc.
Backup simply is corrupted so also the wizard to find new device- wont search or load and greyed out, so have arranged with manufacturer for a new disc - the one I should have bought at the time instead of using the upgrade.
With the Device & Printer device it says I have the keyboard 3000, a compliant mouse and and a HID keyboard device as well as M$ wireless transceiver and of course a 3.0 unknown device which is E Drive. So along with monitor and computer tower
7.
The keyboard is wired via a USB and only the mouse is wireless via the transceiver. So what the HID keyboard device is is a mystery too. So problem there in that wizard too. Plus had to uninstall Mouse/Keyboard ?Centre which improved the performance of the
mouse as 1 setting not 2.

64-bit vs. 32-bit performance on SPARC hardware with the 1.6 JVM

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