[Gluster-devel] Problem during reproducing smallfile experiment on Gluster 10

Thu Jan 20 09:14:57 UTC 2022

Hi,

I think there could be multiple reasons for not getting similar improvement
as we were getting.

1) You are executing a test case in a VM environment. The resources are
limited as compared to a physical machine.
2) The improvement was showing after enable tcmalloc and disable glusterfs
based mempool, I am not
   sure how the memory managed in case of vm environment. On physical
server there is no doubt we were
   getting significant improvement.
3) Can you share what gluster options you have enabled to run the test ?
     gluster v info
4) What is smallfile parameters you have used to run the test case
(no_of_file and no_of_threads)

Thanks,
Mohit Agrawal

On Thu, Jan 20, 2022 at 12:24 PM 박현승 <hspark0582 at gluesys.com> wrote:

> Dear Gluster developers,
>
>
>
> This is Hyunseung Park at Gluesys, South Korea.
>
>
>
> We are trying to replicate the test in
> https://github.com/gluster/glusterfs/issues/2771 but to no avail.
>
> In our experiments, Gluster version 10 unfortunately did not perform
> noticably better than version 9.
>
>
>
>
> v9 2x2       average
> create 3399.99 3484.79 2702.57 3195.783333
> ls -l 65605.2 64930.6 72018.7 67518.16667
> chmod 4858.95 4965.29 5597.73 5140.656667
> stat 7334.88 7755.89 8335.11 7808.626667
> read 7015.64 8255.48 7007.01 7426.043333
> append 2554.93 2777.65 2572.57 2635.05
> mkdir 1800.29 1865.07 1805.48 1823.613333
> rmdir 1854.09 1722.89 1876.81 1817.93
> cleanup 2402.02 2447.36 2438.71 2429.363333
>
> v10 2x2       average
> create 3741.39 3174.82 3234.42 3383.543333
> ls -l 71543.7 67275.9 72975.1 70598.23333
> chmod 5441.11 5109.22 5004.08 5184.803333
> stat 7746.37 7677.99 7885.72 7770.026667
> read 7061.12 7165.21 7121.07 7115.8
> append 3458.93 2641.84 2887.46 2996.076667
> mkdir 2685.22 1879.35 1970.91 2178.493333
> rmdir 2240.11 1648.37 1602.16 1830.213333
> cleanup 3739.68 2407.57 2403.48 2850.243333
>
>
>
> The result above is from the test that deployed 32 threads on each of the
> 4 clients.
>
> Some results were better than others, but it is not good enough when
> compared to the result in the aforementioned link.
>
> We are wondering what we can do to get the full potential of the new
> version.
>
>
>
> We have been running tests with varying file sizes, number of threads,
> different volume topology, etc. but we were not able to see data conclusive
> enough.
>
> We were also not able to find meaningful output from running tests using
> other benchmark tools such as bonnie++ and FIO.
>
>
>
> To find the potential cause we tried to look into the program by calling
> malloc_stats() and using perf.
>
> However, we also could not find something noteworthy from the result.
>
> Here is the data recorded during one set of smallfile test (from create to
> cleanup):
> https://drive.google.com/drive/folders/1NMXNjgOZ7svDd4-YvKCU4UAp43tm15dC?usp=sharing
>
>
>
> Below is our test environment:
>
>
>
> Basic HW info: VM (vSphere), 2 core CPU, 4G RAM. 4 servers and 4 clients.
>
> OS: Centos 7
>
> kernel version: 3.10.0-1160
>
> Gluster version: built from git, checked out from branch 'release-9' and
> 'release-10' respectively (commits 7094da and a804f8)
>
> build option: default setting except "./configure
> --disable-linux-io_uring" (kernel does not support io_uring)
>
> Configuration result (case of version 10):
>
> GlusterFS configure summary
> ===========================
> FUSE client          : yes
> epoll IO multiplex   : yes
> fusermount           : yes
> readline             : no
> georeplication       : yes
> Linux-AIO            : yes
> Linux io_uring       : no
> Use liburing         : no
> Enable Debug         : no
> Run with Valgrind    : no
> Sanitizer enabled    : none
> XML output           : yes
> Unit Tests           : no
> Track priv ports     : yes
> POSIX ACLs           : yes
> SELinux features     : yes
> firewalld-config     : no
> Events               : yes
> EC dynamic support   : x64 sse avx
> Use memory pools     : no
> Nanosecond m/atimes  : yes
> Server components    : yes
> Legacy gNFS server   : no
> IPV6 default         : no
> Use TIRPC            : yes
> With Python          : 3.6
> Cloudsync            : yes
> Metadata dispersal   : no
> Link with TCMALLOC   : yes
> Enable Brick Mux     : no
> Building with LTO    : no
>
>
>
>
>
>
> -------
>
> Community Meeting Calendar:
> Schedule -
> Every 2nd and 4th Tuesday at 14:30 IST / 09:00 UTC
> Bridge: https://meet.google.com/cpu-eiue-hvk
>
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>
>
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