[Bugs] [Bug 1349953] thread CPU saturation limiting throughput on write workloads

[bugzilla at redhat.com]

https://bugzilla.redhat.com/show_bug.cgi?id=1349953



--- Comment #1 from Manoj Pillai <mpillai at redhat.com> ---

Simpler reproduction with a single client:

Created the 12x(4+2) volume and fuse mounted on the client.

Run iozone single client write test with 8 threads/files:
iozone -i 0 -w -+n -c -C -e -s 10g -r 64k -t 8 -F /mnt/glustervol/f{1..8}.ioz

Output:
throughput for  8 initial writers  =  179084.75 kB/sec

Output from: top -bH -d 10:

top - 13:55:21 up 191 days, 12:36,  6 users,  load average: 0.92, 0.32, 0.55
Threads: 292 total,   3 running, 289 sleeping,   0 stopped,   0 zombie
%Cpu(s): 10.3 us,  4.9 sy,  0.0 ni, 84.7 id,  0.0 wa,  0.0 hi,  0.2 si,  0.0 st
KiB Mem : 65728904 total, 54453352 free,   861572 used, 10413980 buff/cache
KiB Swap: 32964604 total, 32963420 free,     1184 used. 64082548 avail Mem

  PID USER      PR  NI    VIRT    RES    SHR S %CPU %MEM     TIME+ COMMAND
 8839 root      20   0  892360 239612   3572 R 99.8  0.4   0:53.34 glusterfs
 8836 root      20   0  892360 239612   3572 S 19.6  0.4   0:10.37 glusterfs
 8835 root      20   0  892360 239612   3572 S 19.0  0.4   0:10.18 glusterfs
 8834 root      20   0  892360 239612   3572 S 18.8  0.4   0:10.17 glusterfs
 8833 root      20   0  892360 239612   3572 R 18.6  0.4   0:10.49 glusterfs
 8853 root      20   0   47432  18796    168 S  2.2  0.0   0:01.25 iozone
 8855 root      20   0   47432  18800    168 S  2.2  0.0   0:00.99 iozone
[...]

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