Thanks Josh and Tom for the info. Tom, I was unable to profile my flowgraphs using your suggested method. For some reason, the head block does not predictably stop the program. For example, if I specify 15 items it will return immediately (as expected), but if I use 16 items it will hang.
On Nov 22, 2011, at 5:04 PM, Tom Rondeau wrote: > On Tue, Nov 22, 2011 at 7:53 PM, Josh Blum <[email protected]> wrote: > > > On 11/22/2011 04:20 PM, Jordan Otomo wrote: > > Hi, > > > > I'm having issues using the hier_block2. When I create a flowgraph > > consisting of roughly 12 blocks, I don't get any overruns. However, > > combining blocks (e.g. source -> hier_block2 -> sink) results in a > > ton of overruns. The parameters of the individual blocks that have > > been combined into the hier_block2 have not changed. Does the > > hier_block2 wait for the work function of each of the blocks it > > encompasses to return before producing outputs/requesting more > > inputs? Any thoughts or advice would be greatly appreciated. > > > > Your saying that a flow graph of *identical* topology has *different* > performance when moving some of the blocks into a hier block? > > If thats the case, its hard to believe. The the flow graph is run, its > essentially flattened. There is no difference to the scheduler or > buffers whether or not hierarchical blocks were used. > > -josh > > Yep, what Josh said. If this really is the case, though, it's definitely a > problem. Instead of using USRPs and looking at the overruns as your > benchmark, could you put in a signal source and a gr_head block of some > number of samples (10 to 100 million or so, enough to get a good measurement) > and switch out your sinks for null_sinks. Run the program and time it between > the non-hier block and the hier block version and let us know what you get. > > Thanks, > Tom > > _______________________________________________ > Discuss-gnuradio mailing list > [email protected] > https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
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