[OpenIndiana-discuss] oracle removes 32bit x86 cpu support for solaris 11 will OI do same?

[Dmitry Kozhinov]

 > So I guess it would be fair to say that the best OS is the one that
 > support both at the same time

Yes, and that's OSol and OI do.

On 24.06.2011 22:17, Michael Stapleton wrote:
> So I guess it would be fair to say that the best OS is the one that
> support both at the same time, and leaves the option to the developer
> for each individual application.
>
> My understanding is that Solaris is more like 4G per process/kernel,
> rather than 4GB total.
> Multiple 32 bit processes could use more than 4GB total; just not
> individually.
>
> Mike
>
>
> On Fri, 2011-06-24 at 15:58 +0000, Steve Gonczi wrote:
>
>> For Intel CPUs, 32 bit code is certainly more compact , and in some cases
>> arguably faster than 64 bit code. (say, comparing the same code on the same machine
>> compiled 32 and 64 bit)
>>
>> But, newer cpu silicon tends to make performance improvements
>> in many ways (e.g locating more supporting circuity on the cpu's silicon, increasing L1 /L2
>> cache sizes, etc)
>>
>> Newer CPUs also tend to be more energy efficient.
>> Intel made great strides towards energy efficiency.
>> E.g.: idling the cpu when not in use ( deep C states etc.
>> of gating off any circuitry that is not in use, modulating the cpu clock rate
>> ( SpeedStep).
>>
>> So performance and energy efficiency is more dependent on
>> which generation of cpu core design we have, rather than on
>> just the the bitness .
>>
>>
>> The primary advantage of "64 bit" per se ( ie running a given cpu in 64 bit mode)
>> is the increased addressable memory space.
>> The current hardware limit set by the manufacturers is at 48 address bits
>> (256 terabytes theoretical limit) Actual OS support cuts this in half, or less.
>> Motherboard limitations further curtail this, but 48G motherboards are now
>> commonplace.
>>
>> On 32 bit Intel (Amd) you are typically limited to 4G, which is split between kernel and userland
>> depending on the OS and configuration. (E.g.: 1G kernel and 3G userland)
>>
>> Steve
>>
>> ----- "Michael Stapleton"<michael.stapleton at techsologic.com>  wrote:
>>
>>
>> While we are talking about 32 | 64 bit processes;
>> Which one is better?
>> Faster?
>> More efficient?
>>
>> Mike
>>
>>
>>
>>
>>
>>
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