As far as I know,we have never checked reducing the Thread stack size. However, considering that the RSS size is always significantly smaller than virtual memory, it seems, it could work. It is hard to influence the number of threads, because for every connection a couple of threads (3?) are spun up. So, the more neighbors you are connected to, the more threads you get. Basically the multi-threaded model is in the DNA of IBR-DTN because only these architecture will allow making use of multicore architectures. . However, according to our experience there is not much overhead from those threads. We have seen MUCH more threads than 25 on OpenWRT based MIPS boards without any problems.
Also, if you remove a neighbor, after some while the number of threads should go down again (there should not be any "thread-leakage", if there is, it is a bug)
Here are some more information regarding the maximum number of threads and influence on virtual memory:
http://stackoverflow.com/questions/344203/maximum-number-of-threads-per-proc...
But anyway, if you hit any walls, let us know :)
Sebastian
Am 19.06.2014 um 10:55 schrieb Tiago Condeixa tscondeixa@ua.pt:
Hi,
I install ibrdtn software in single board computers running OpenWrt with MIPS architecture and just 128M of RAM Memory. Because of this, I reduce the thread stack size in Thread.cpp file from 2M to 256K and virtual memory reduces a lot, and at least during the last day it didn’t crash. Do you tested the ibrdtn with smaller value or do you know if I will have a segmentation fault for larger scenarios? What is the operation requiring more memory by dtnd? I defined a path for the bundle storage.
I also check dtnd process and it uses around 25 threads, which is a lot for our embedded system with other programs running. There is any change to reduce the number of threads? and how can I do it?
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