The Python version of the server side of KATCP is shown below. (there may be a C version somewhere) . https://github.com/ska-sa/katcp-python/blob/master/katcp/server.py
This uses futures from concurrent.futures and tornado futures. As some may already know, "threading" in Python is fake. All threads stall all other threads due to a Global Interpreter Lock (GIL). This is exactly the behavior that I am seeing from network speed tests. One of my own processes can retrieve from a Snapshot at 2.1 Megabytes/sec. However, for 8 concurrent processes, I only see 6.1 Megabytes/sec. It is exactly as if the parallel connections refuse to stack up correctly. If the CASPERized Linux on the PS of the board side is running Python Katcp (and not the C version) then it would be stalling connections until the GIL allows them into the single thread-of-execution. Can anyone on this forum confirm any of this? What is happening on the CASPERized Linux image? Where could I see this for myself? What processes in ps aux might I see related to katcp servers on the PS side? On Sunday, December 8, 2024 at 12:26:26 AM UTC-5 Ken Semanov wrote: > Is there a way I could nose around the katcp server on the board side in > order to see how it is configured? > > Could I reconfigure this server after booting into the board? > > I am using a CASPERized image on a ZCU216. I am migrating data out of > snapshot blocks over network. After several network tests, it appears that > the katcp on the board side (PS) is artificially limited to 3 or 4 > simultaneous network connections over RJ45 ethernet. My use-case needs > this to be more like 8 to 16 connections. I may also need to change the > packet size. > > Thanks. > -- You received this message because you are subscribed to the Google Groups "casper@lists.berkeley.edu" group. To unsubscribe from this group and stop receiving emails from it, send an email to casper+unsubscr...@lists.berkeley.edu. To view this discussion visit https://groups.google.com/a/lists.berkeley.edu/d/msgid/casper/de383a42-be56-4dff-bc41-56d4fdfef933n%40lists.berkeley.edu.
