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HugoPresents/vm_io_performance.md

Created December 26, 2014 03:59
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Virtualbox IO Performance
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vm_io_performance.md

~ is local, ~/htdocs mounted by vboxsf, /var/htdocs mounted by nfs.

local

read

root@Ubuntu:~# time dd bs=8k count=300000 if=test of=/dev/zero
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 3.9852 s, 617 MB/s

real	0m3.990s
user	0m0.004s
sys	0m2.794s

write

root@Ubuntu:~# time dd bs=8k count=300000 if=/dev/zero of=test conv=fdatasync
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 3.87739 s, 634 MB/s

real	0m3.890s
user	0m0.032s
sys	0m3.501s

nfs

read

it takes too long, give up.

write

root@Ubuntu:~# time dd bs=8k count=300000 if=/dev/zero of=/var/htdocs/test conv=fdatasync
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 146.354 s, 16.8 MB/s

real	2m26.361s
user	0m0.040s
sys	0m3.493s

vboxsf

read

root@Ubuntu:~# time dd bs=8k count=300000 if=~/htdocs/test of=/dev/zero
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 28.0652 s, 87.6 MB/s

real	0m28.068s
user	0m0.012s
sys	0m15.446s

write

root@Ubuntu:~# time dd bs=8k count=300000 if=/dev/zero of=~/htdocs/test conv=fdatasync
300000+0 records in
300000+0 records out
2457600000 bytes (2.5 GB) copied, 45.8428 s, 53.6 MB/s

real	0m45.846s
user	0m0.020s
sys	0m22.363s
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