Speed problem

Rainer Zocholl UseNet-Posting-02141- at zocki.toppoint.de
Wed Nov 13 19:49:00 EST 2002

uwp at dicke-aersche.de 12.11.02 11:24

Once upon a time no realname shaped the electrons to say...

>On Mon, 11 Nov 2002, I've been saying:

>> But why does it only happen with rsync ?

>Ok, the last tests with rsync/rsh have shown the following:
>(all on the receiving side)

>CPU: 100%
>Load: 2.5
>blocks in: 38000/s
>even though nothing get written
>(no statistics)
>when it starts to write, it goes from 15000 to 32000 blocks in
>blockout even has no problems and just writes it down in
>58000 - 60000 blocks and has 4 seconds of 0 blocks bo
>Funny: rsh only brings also just 12-18 MB/s just like native scp
>Effects are equal, it starts at a very high rate
>and drops after a while

How many RAM does the box have on CPU and in RAID?

What is happening if you do on an other root console
something like:
while (1)
  sleep 1

(IOW: force disk caches to flush immediately, constantly?)

"pulling" the data is almost always faster that "pushing"

Is that true for rsync too?


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