Gluster users - Aug 2015 - write(filename, ...) implementation

Hi,

I'm doing a lot of small writes to distributed/replicated Gluster volume.
The performance I'm getting is not acceptable. Interestingly, I'm
getting doubled speed boost if I use libgfsapi instead of kernel volume mount.

My guess is that I could get significant boost if I could reduce RPC roundtrips
somehow. So, instead of open->write->close sequence I'd like to use
single write(filename, ...) call.

Can someone point me to the relevant places in Gluster source code and briefly
explain how to acomplish that? I really need just some rough ideas.

Ivica

On 08/24/2015 11:24 PM, Ivica Siladic wrote:
> Hi,
>
> I'm doing a lot of small writes to distributed/replicated Gluster
volume. The performance I'm getting is not acceptable. Interestingly,
I'm getting doubled speed boost if I use libgfsapi instead of kernel volume
mount.
>
> My guess is that I could get significant boost if I could reduce RPC
roundtrips somehow. So, instead of open->write->close sequence I'd
like to use single write(filename, ...) call.
>
> Can someone point me to the relevant places in Gluster source code and
briefly explain how to acomplish that? I really need just some rough ideas.
>
This can be done using anonymous fd write. There are APIs exported by 
libgfapi to do anonymous write (glfs_h_anonymous_write). Please refer to 
'tests/basic/gfapi/anonymous_fd_read_write.c' regarding its usage.

Thanks,
Soumya
> Ivica
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