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[Discuss-gnuradio] expl me this

From: Marcus D. Leech
Subject: [Discuss-gnuradio] expl me this
Date: Sun, 05 Dec 2010 18:25:16 -0500
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Why should:


Be causing Gnu Radio to attemp to allocate 16GB of virtual memory? Under what drug-induced fantasy should a straight-line FFT (admittedly a chunky FFT) buffer be ballooned out by a factor of 1000, when the FFT size is a power of 2!

I realize that only *half* of that space actually maps to physical memory, but 8GB for an FFT of order 2**23 is decidedly piggy.

Furthermore, it always provokes a fatal error, no matter which "factory" I use for buffer allocation:

gr_vmcircbuf_mmap_shm_open: invalid size = -795873280
gr_buffer::allocate_buffer: failed to allocate buffer of size 15999996 KB
terminate called after throwing an instance of 'std::bad_alloc'
  what():  std::bad_alloc

Because it looks like that buffer size is 32-bits unsigned, regardless of the underlying system architecture (I'm on an x86_64 machine).

Marcus Leech
Principal Investigator
Shirleys Bay Radio Astronomy Consortium

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