aDriv4 - MANAGER

Edit File: gethostlatency_example.txt

Demonstrations of gethostlatency, the Linux bpftrace/eBPF version. This traces host name lookup calls (getaddrinfo(), gethostbyname(), and gethostbyname2()), and shows the PID and command performing the lookup, the latency (duration) of the call in milliseconds, and the host string: # ./gethostlatency.bt Attaching 7 probes... Tracing getaddr/gethost calls... Hit Ctrl-C to end. TIME PID COMM LATms HOST 02:52:05 19105 curl 81 www.netflix.com 02:52:12 19111 curl 17 www.netflix.com 02:52:19 19116 curl 9 www.facebook.com 02:52:23 19118 curl 3 www.facebook.com In this example, the first call to lookup "www.netflix.com" took 81 ms, and the second took 17 ms (sounds like some caching). There is another version of this tool in bcc: https://github.com/iovisor/bcc The bcc version provides options to customize the output.