Re: [Discuss-gnuradio] why alignment feature work only when output_multiple not set

[Tiankun Hu]

Hi Tom, Johnathan,
Thanks your reply.

Hi Marcus,
Seems your conclusion is make sense.
I think it might relate with buffer size which was allocated in "flat_flowgraph.cc /  allocate_buffer"

    // *2 because we're now only filling them 1/2 way in order to
    // increase the available parallelism when using the TPB scheduler.
    // (We're double buffering, where we used to single buffer)
    int nitems = s_fixed_buffer_size * 2 / item_size

But I don't know why do it can increase parallelism?

在 2015年06月19日 22:48, Johnathan Corgan 写道:

On Fri, Jun 19, 2015 at 6:09 AM, Tom Rondeau <address@hidden> wrote:

On Thu, Jun 18, 2015 at 8:29 AM, Tiankun Hu <address@hidden> wrote:

Hi Tom,
Thanks your reply, I have another question, in function "min_available_space" why buffer_size/2 is best ? 

I'm not really sure. That's a question for Eric.

The scheduler aims to keep the buffer no more than half full, so that in the steady state the producing block can write into the free half and the downstream consuming block(s) read from the filled half.

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Johnathan Corgan
Corgan Labs - SDR Training and Development Services

Intro to SDR Class - June 29-30, El Segundo, CA
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Thanks
Tiankun