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@redhat.com>
Reviewed-on: https://review.gluster.org/17887
CentOS-regression: Gluster Build System <jenkins@build.gluster.org>
Smoke: Gluster Build System <jenkins@build.gluster.org>
Reviewed-by: Krutika Dhananjay <kdhananj@redhat.com>

0 files changed, 0 insertions, 0 deletions