[sheepdog] [PATCH v2 1/3] dog: parallelize parse_vdi() with work queue

[MORITA Kazutaka]

At Tue, 27 Aug 2013 21:35:35 +0900,
Hitoshi Mitake wrote:
> 
> Current dog issues request for gathering VDI information in a
> sequential manner (parse_vdi()). This way is not scalable when a
> number of VDIs becomes larger.
> 
> This patch parallelize parse_vdi() with work queue. Some dog
> commands which call parse_vdi() can enjoy performance improvement.
> 
> The below is an sample of dog vdi list. The test is done on 16
> nodes cluster which has 3000 VDIs.
> 
> Before:
> $ time sh -c "dog/dog vdi list -a 10.68.13.1 > /dev/null"
> sh -c "dog/dog vdi list -a 10.68.13.1 > /dev/null"  8.81s user 0.24s system 70% cpu 12.876 total
> 
> After:
> % time sh -c "dog/dog vdi list -a 10.68.13.1 > /dev/null"
> sh -c "dog/dog vdi list -a 10.68.13.1 > /dev/null"  14.35s user 2.02s system 209% cpu 7.816 total

user time + system time > total time

Is this really correct?

Thanks,

Kazutaka