SUMMARY: Solaris-10: 4GB max process size ?

Found it : compiled my test-program with "gcc", so started searching if 
"gcc" needs to produce code specially for 64-bit environments -> "-m64" 
option

gcc -m64 -o memalloc memalloc.c

Now it runs as a glitch over the 4GB 'boundary'...

Rob

Rob De Langhe wrote:

> Hi,
>
> recently re-installed E25K domains with Solaris-10, and my users 
> complain that their application fails to load a big chunk of data into 
> memory to produce later an output file with reworked data. When they 
> ran their program on the same box but under Solaris-8, such output 
> file was about 250MB in size, so not spectacular.
> While I monitor the size of such process (in Solaris-10) during its 
> loading of data, it exits just around 4GB of virtual memory size, with 
> error "out of memory".
>
> So I reproduce this, with a small C-program that calls "malloc()" for 
> chunks of 200MB each. It does so till exactly 4GB, than terminates 
> with "Not enough space"...
>
> My server has 128GB of RAM installed, 4GB of swap.
> While I run my tiny (but growing) program, the swap remains entirely 
> unused ("swap -l" reports all 4GB free), and RAM decreases from 
> around  82GB free to 78GB free, then back (when the space from my 
> program is returned).
>
> I searched all around the kernel params, docs.sun.com, and Google, but 
> nowhere anything that resembles a 32-bit behaviour to limit memory 
> size per process to 4GB.
> Yes, my machine runs in 64-bit mode ("isainfo -v" reports 64-bit 
> sparcv9 kernel)
> My user (as any other user) has % ulimit -a
> ... virtual memory (kbytes)      unlimited
>
> Any hints or tips?
>
> Rob
>
>

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