Re: High system times on Scaleway Cloud server

[Alexander Nasonov <alnsn%yandex.ru@localhost>]

Jason Thorpe wrote:
> I would start by using dtrace to get some profiling information of where the time is being spent while on-CPU and generate a flame graph for it.

I'm not sure that dtrace is available but tprof works!Â

# tprof monitor -e CPU_CYCLES:k -o tprof.out sleep 30
# tprof analyze tprof.out

File: tprof.out
Number of samples: 74

percentage   nsamples pid    lwp  cpu  k address          symbol
------------ -------- ------ ---- ---- - ---------------- ------
   2.702703%        2      0    4    0 1 ffffffc0000040a4 splx+0xbc
   2.702703%        2      0   92    0 1 ffffffc000457908 vfs_vnode_iterator_next1+0x78
   1.351351%        1  27653    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  27141    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  25997    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  25057    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  24441    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  23893    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  23337    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  22489    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  18477    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  17802    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  16665    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  16638    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  16429    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  16342    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  16173    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1  15047    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   6328    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   5980    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   5054    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   4933    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   3791    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   2512    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   2506    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1   1340    1    0 1 ffffffc0000040a4 splx+0xbc
   1.351351%        1    628    1    0 1 ffffffc0000040a4 splx+0xbc
...

-- 
Alex