Odp: Re: how to compute measured bwidth

Piotr Kadziolka PKadziolka at acppharma.pl
Sun Sep 7 23:46:45 UTC 2008

Hi Alex,

I had deep look at binary log and I know why bwidth dropped. Near at the 
end of fill phase I saw xact error and from that point to the end of test 
I observed a lot lot errors. I count almost 70 percent contribution of 
errors in totals transactions. It was one type of error: (c19) unsupported 
HTTP status code.

766.81| Xaction.cc:74: error: 1/2 (c19) unsupported HTTP status code
1108188903.706303# obj: 
flags: rpt,basic,GET, size: 0/-1 xact: 0baba0e0.3a2d01ab:0068626e
HTTP/1.1 502 Proxy Error ( W magazynie brak miejsca dla wykonania tego 
polecenia.  There was no free space in the storage to execute that 
Via:1.1 SR-ISA
Pragma: no-cache
Cache-Control: no-cache
Content-Type: text/html
Content-Length: 3795

One of two disk had crashed. That's all mystery.

Thanks for Your help Alex,

Alex Rousskov <rousskov at measurement-factory.com> 
2008-09-07 23:45

Piotr Kadziolka <PKadziolka at acppharma.pl>
users at web-polygraph.org
Re: how to compute measured bwidth

On Sun, 2008-09-07 at 14:52 +0200, Piotr Kadziolka wrote:

> I've obtained below results from report generator. I attached load
> trace also. My question is how to compute measured bandwidth because
> when I plot rep.rate multiplied by rep.size.mean I can't obtain trace
> similar to this at pict. 
> According to results offered load in volume is higher than measured
> but when I plot req.rate multiplied by rep.size.mean (which
> theoretically shuld be offered load) together with measured load
> (rep.rate x rep.size.mean) I got the same trace. Please, tell me how
> to compute measured load in volume context. 
> Load                Count                Volume 
>                 (xact/sec)        (Mbits/sec) 
> offered         150.34                10.53 
> measured        150.33                3.35 

Interesting. Can you send me (off-list) the binary logs from this test?
I will investigate why the bandwidth dropped while request rate remained
the same.

Thank you,


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