[riot-notifications] [RIOT-OS/RIOT] tests/periph_spi: Add thread runtime stats (#14087)

benpicco notifications at github.com
Tue May 19 11:43:51 CEST 2020


On `samr21-xpro` I get

```
2020-05-19 11:42:47,830 # ### Running some benchmarks, all values in [us] ###
2020-05-19 11:42:47,833 # ### Test				Transfer time	user time
2020-05-19 11:42:47,833 # 
2020-05-19 11:42:47,861 #  1 - write 1000 times 1 byte:			24113	24132
2020-05-19 11:42:47,910 #  2 - write 1000 times 2 byte:			44904	44923
2020-05-19 11:42:50,050 #  3 - write 1000 times 100 byte:		2129446	2129465
2020-05-19 11:42:50,103 #  4 - write 1000 times 1 byte to register:	47779	47798
2020-05-19 11:42:50,177 #  5 - write 1000 times 2 byte to register:	68696	68715
2020-05-19 11:42:52,341 #  6 - write 1000 times 100 byte to register:	2153217	2153236
2020-05-19 11:42:52,390 #  7 - read 1000 times 2 byte:			45050	45069
2020-05-19 11:42:54,530 #  8 - read 1000 times 100 byte:		2129592	2129611
2020-05-19 11:42:54,604 #  9 - read 1000 times 2 byte from register:	68842	68861
2020-05-19 11:42:56,768 # 10 - read 1000 times 100 byte from register:	2153363	2153382
2020-05-19 11:42:56,818 # 11 - transfer 1000 times 2 byte:		45030	45049
2020-05-19 11:42:58,960 # 12 - transfer 1000 times 100 byte:		2131571	2131590
2020-05-19 11:42:59,034 # 13 - transfer 1000 times 2 byte to register:	68780	68799
2020-05-19 11:43:01,200 # 14 - transfer 1000 times 100 byte to register:2155321	2155340
2020-05-19 11:43:02,206 # -- - SUM:					13265704	13265970
2020-05-19 11:43:02,206 # 
2020-05-19 11:43:02,208 # ### All runs complete ###
```

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