[Bugs] [Bug 1475605] gluster-block default shard-size should be 64MB
bugzilla at redhat.com
bugzilla at redhat.com
Thu Jul 27 01:47:58 UTC 2017
https://bugzilla.redhat.com/show_bug.cgi?id=1475605
--- Comment #3 from Worker Ant <bugzilla-bot at gluster.org> ---
COMMIT: https://review.gluster.org/17887 committed in master by Krutika
Dhananjay (kdhananj at redhat.com)
------
commit abfbc3eb821e144ddbfdc5d7da401557b52beaf1
Author: Pranith Kumar K <pkarampu at redhat.com>
Date: Wed Jul 26 20:27:08 2017 +0530
group-gluster-block: Set default shard-block-size to 64MB
With 4MB shard size I/O slows down more because of the extra
inodelk/xattrops in replicate. So increasing it to 64MB which
gave better performance than 4MB.
To simulate writes on a preallocated VM-image, fallocate the file and then
do
dd with notrunc
do "fallocate -l 1GB" then "dd if=/dev/zero of=file-1GB bs=1MB count=1024
conv=notrunc"
These are the results on my laptop for dd:
With 4MB:
1.84 1357.37 us 19.00 us 12431.00 us 1188
FINODELK
2.45 255.08 us 58.00 us 4038.00 us 8428
WRITE
95.69 78967.76 us 30.00 us 20324240.00 us 1063
FXATTROP
With 64MB:
0.13 59.36 us 15.00 us 814.00 us 657
FINODELK
6.02 225.53 us 69.00 us 6556.00 us 8205
WRITE
93.82 103015.12 us 32.00 us 13046368.00 us 280
FXATTROP
BUG: 1475605
Change-Id: I4ed5441409df639e38c731ba0d140fe92902f25f
Signed-off-by: Pranith Kumar K <pkarampu at redhat.com>
Reviewed-on: https://review.gluster.org/17887
CentOS-regression: Gluster Build System <jenkins at build.gluster.org>
Smoke: Gluster Build System <jenkins at build.gluster.org>
Reviewed-by: Krutika Dhananjay <kdhananj at redhat.com>
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