[sheepdog-users] [sheepdog users] cluster snapshot VS qemu-img
namei.unix at gmail.com
Mon Aug 18 11:11:33 CEST 2014
On Mon, Aug 18, 2014 at 10:45:37AM +0200, Valerio Pachera wrote:
> I've been testing cluster snapshot with the new --multithread option.
> converting the same vdi:
> cluster snapshot --multithread
> time 4'14''
> dog cpu 42%
> sheep cpu 23%
> I/O nic input: 116Mbit/s
> qemu-img convert
> time 2'13''
> qemu-img cpu 20%
> sheep cpu 45%
> I/O nic input: 205Mbit/s
> Restore: 6'01''
We use only at most nr_of_nodes * 2 threads for snapshot save, considering not
draining the cluster too much.
I guess qemu-img use more threads and it doesn't calculating the fingerprint
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