January 2018
Intermediate to advanced
456 pages
12h 49m
English
Content preview from Embedded Linux Development Using Yocto Project Cookbook - Second Edition
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How to do it...
Perf can be used to provide a default set of event statistics for a particular workload with:
# perf stat <command>
For example, a single ping will provide the following output:
# perf stat ping -c 1 192.168.1.1
PING 192.168.1.1 (192.168.1.1): 56 data bytes
64 bytes from 192.168.1.1: seq=0 ttl=64 time=6.489 ms
--- 192.168.1.1 ping statistics ---
1 packets transmitted, 1 packets received, 0% packet loss
round-trip min/avg/max = 6.489/6.489/6.489 ms
Performance counter stats for 'ping -c 1 192.168.1.1':
3.447000 task-clock (msec) # 0.518 CPUs utilized
2 context-switches # 0.580 K/sec
0 cpu-migrations # 0.000 K/sec
40 page-faults # 0.012 M/sec
2705987 cycles # 0.785 GHz
682239 stalled-cycles-frontend # 25.21% frontend ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.