parsing-graphml

In parallel!

Before:

$ /usr/bin/time -v make graph-rssi
[...]
Making RSSI graphics...
. venv/bin/activate && python3 rssi.py csv/edges/signal-avg.csv csv/edges/tx-packets.csv csv/edges/tx-failed.csv graphs
Finished RSSI successfully !
	Command being timed: "make graph-rssi"
	User time (seconds): 326.44
	System time (seconds): 121.88
	Percent of CPU this job got: 153%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 4:52.26
	Average shared text size (kbytes): 0
	Average unshared data size (kbytes): 0
	Average stack size (kbytes): 0
	Average total size (kbytes): 0
	Maximum resident set size (kbytes): 332848
	Average resident set size (kbytes): 0
	Major (requiring I/O) page faults: 0
	Minor (reclaiming a frame) page faults: 181227
	Voluntary context switches: 165380
	Involuntary context switches: 13063
	Swaps: 0
	File system inputs: 0
	File system outputs: 35136
	Socket messages sent: 0
	Socket messages received: 0
	Signals delivered: 0
	Page size (bytes): 4096
	Exit status: 0

After:

$ /usr/bin/time -v make graph-rssi
[...]
Making RSSI graphics...
. venv/bin/activate && python3 rssi.py csv/edges/signal-avg.csv csv/edges/tx-packets.csv csv/edges/tx-failed.csv graphs
Finished RSSI successfully !
	Command being timed: "make graph-rssi"
	User time (seconds): 920.24
	System time (seconds): 135.55
	Percent of CPU this job got: 2676%
	Elapsed (wall clock) time (h:mm:ss or m:ss): 0:39.44
	Average shared text size (kbytes): 0
	Average unshared data size (kbytes): 0
	Average stack size (kbytes): 0
	Average total size (kbytes): 0
	Maximum resident set size (kbytes): 314824
	Average resident set size (kbytes): 0
	Major (requiring I/O) page faults: 163
	Minor (reclaiming a frame) page faults: 1186846
	Voluntary context switches: 155809
	Involuntary context switches: 49417390
	Swaps: 0
	File system inputs: 0
	File system outputs: 35136
	Socket messages sent: 0
	Socket messages received: 0
	Signals delivered: 0
	Page size (bytes): 4096
	Exit status: 0

On a 32 (logical) cores Intel i9 CPU from the 13th gen.
So ~3 times the amount of CPU work, but ~7 times less elapsed time.