> -----Original Message-----
> From: Gavriliuk, Anton (HPS Ukraine)
> Sent: Monday, December 4, 2017 11:12 AM
...
> I have run next command several times,
>
> perf record /usr/local/bin/fio --filename=/dev/dax0.0 --rw=randrw --
> refill_buffers --norandommap --randrepeat=0 --ioengine=mmap --
> bssplit=4k/4:8k/7:16k/7:32k/15:64k/65:128k/1:256k/1 --rwmixread=5 --
> iodepth=1 --numjobs=16 --runtime=1800 --group_reporting --name=4-rand-rw-
> 3xx --size=290g --numa_cpu_nodes=0
>
> each perf report shows me toppest clock_thread_fn(),
>
> Samples: 8M of event 'cycles:ppp', Event count (approx.): 23391179916235
> Overhead Command Shared Object Symbol
> 75.27% fio fio [.] clock_thread_fn
> 13.68% fio libc-2.22.so [.] __memcpy_avx_unaligned
> 10.05% fio fio [.] fill_random_buf
This just runs one pass through memory, so the startup overhead is magnified.
Add --time_based=1 so it really runs for 1800 s.
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