[FLASH-USERS] Maximum number of blocks

[Brock Palen]

You can't.  I won't go into details but under 32bit applications can  
not use more than 2gb of memory of the 4gb space provided by 32bit  
addressing.

You don't want to anyway which I will try to explain from a system  
point of view.  The flash people will have to help you with flash.   
Also the E4500 does support EM64T so they CAN run 64 bit if you  
install 64bit linux (x86_64) and thats what we run here.

Now that 2GB is per-process.  If you have a dual core system you can  
run two processes each, each using 2GB.  (total system can not have  
more than 4gb installed without things like PAE or going to x86_64).   
But because you only have 3GB of memory in each node, you don't want  
each process using more than 1.5GB of memory.  And trust me flash  
will use it.  If you go over this your system will 'swap'  reducing  
performance by orders of magnitude, and will wear out your hard drives.

Now MAXBLOCKS is per cpu max number of blocks it can hold at any one  
time.  If your total problem need to have more blocks, you can lower  
maxblocks, but increase the number of cpus you run on.  Letting the  
problem have more places to put those blocks.

If you only have your one system with 3GB of ram, I am am 80% sure  
you can not do what you want to do with the hardware you have.  Sorry.

Others please chime in if I am wrong, I do not like my answer.

Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
brockp at umich.edu
(734)936-1985



On Mar 20, 2008, at 10:51 AM, Seyit Hocuk wrote:

> Yes that's 2GB and indeed my machine is 32bit only. I use an intel  
> machine core 2 duo  E4500  @ 2.20GHz, cache size: 2048 KB, with 3GB  
> internal memory.
>
> Is there a way to increase resolution by circumventing this limit?
>
> Kind Regards,
> Seyit
>
>
>
> Brock Palen wrote:
>> Thats 2GB.  I am guessing your machine is 32bit only?  What is  
>> your architecture?
>>
>> Brock Palen
>> www.umich.edu/~brockp
>> Center for Advanced Computing
>> brockp at umich.edu
>> (734)936-1985
>>
>>
>>
>> On Mar 20, 2008, at 10:06 AM, Seyit Hocuk wrote:
>>
>>> 2147483647
>
>
>