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Stack requirements, why is it so big?
- Date: Thu, 04 May 2000 14:30:29 +0300
- From: leonp at plris.com (Leon Pollak)
- Subject: Stack requirements, why is it so big?
My application has 16 tasks, which means that, using default
STACK_MINIMUM_SIZE definition (which is 8K for powerpc cpu MPC860), I
must have RTEMS workspace size >> 112K.
I can't use less because the 'thread create" process checks this and
forces the default minimum size to be used.
Having the following numbers for code:
librtems_g - 86K
libcsupport - 14k
libc - 10k
my application 110K
my data - 145K
this means that I have no memory in my 512K RAM. And all this before
the networking, which I didn't incorporate yet (but for which I have
another bank of 512K RAM).
Now, in this connection, I have two questions:
1. What are the ideas behind this default definition of the stack to 8K?
The old version of C Application Supplement for 68020 that I have says
that 331 byte is enough. I wasn't able to find the corresponding
document for powerpc. Does it exist?
2. If the figures I mentioned are approximately correct, how do the
people use networking? How much RAM do you have?
I shall be very thankful for the clarification.
leonp at plris.com