Rsync push is slower compared to pull

[wwp]

Hello Dag,


On Wed, 23 Aug 2006 14:50:39 +0200 (CEST) Dag Wieers <dag at wieers.com> wrote:

> On Wed, 23 Aug 2006, Srinivasa Battula wrote:
> 
> > On Wed, 32 Aug 2006, Dag Wieers wrote:
> > > On Wed, 23 Aug 2006, Srinivasa Battula wrote:
> > > 
> > > >   It has been observed that rsync push mode is much slower when
> > > > compared to pull (On Identical scenarios). Building/receiving file
> > > > list takes almost same time. But data transfer is much slower, whose
> > > > transfer ratios are ranging from 1:3 to 1:5. On pull operation data
> > > > transfer speed is consistently around 3.5 MB/Sec and it reached 10
> > > > MB/Sec. However, on push the maximum it could reach is around 2
> > > > MB/Sec and hogs around 1MB/Sec. Why is this difference? Please help
> > > > me on this...
> > > 
> > > Do these identical scenarios also include changing the sender and
> > > receiver 
> > > for both push and pull ? That would be required to dismiss the network 
> > > configuration/environment as the possible cause.
> >
> > Source and Target remain same. The way rsync is being invoked is
> > different.
> 
> My question implied to urge you to test with the sender and receiver 
> switched. And compare those results as well. You should end up with 4 sets 
> of transfer speed data.
> 
> Analysing that should make clear if pulling/pushing is the cause, or if it 
> is the network environment (sender/receiver).
> 
> Also make sure that the tests are not influenced by other factors (eg. 
> other people doing exactly the same test as yours on the same 
> network/system :)). Doing the tests multiple times during the day may make 
> it more convincing to state your case.

Wouldn't disk-read and disk-write speeds explain or hide the difference
sometimes, if Srinivasa does the reverse test (exchange server and client
machines, perform the same test)? Even, hardware speeds in general?


Regards,

-- 
wwp
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