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bytesIn bytesOut objectSize
11-10-2010, 12:06 AM
Post: #1
bytesIn bytesOut objectSize
How are these metrics defined?

Thanks!
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11-10-2010, 12:10 AM
Post: #2
RE: bytesIn bytesOut objectSize
bytesIn and bytesOut are the number of bytes sent on the wire for a given request (including headers, compression, etc).

objectSize is the size of the actual "thing" returned (payload) without the http headers.
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11-15-2010, 11:38 PM
Post: #3
RE: bytesIn bytesOut objectSize
Hmmmm. The page request returns an objectSize of 0. Why would that be? bytesIn is non-zero.
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11-15-2010, 11:40 PM
Post: #4
RE: bytesIn bytesOut objectSize
Do you have a sample result?

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-Pat
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11-17-2010, 05:28 AM
Post: #5
RE: bytesIn bytesOut objectSize
It seems to be the page request itself. So for example from the test history:

2010/11/16 12:45:10 New York, NY - IE8 - DSL http://facebook.com

The request to http://facebook.com has an objectSize of 0.
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11-17-2010, 09:32 AM
Post: #6
RE: bytesIn bytesOut objectSize
My initial thought was that since http://facebook.com is a 301 redirect to http://www.facebook.com you could get a 0 byte response, but WebPagetest usually handles redirects with no problem (e.g. http://www.webpagetest.org/result/101116_CMST/ or http://www.webpagetest.org/result/101116_CMFR/). Can you provide a link to the actual test result?
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11-18-2010, 04:54 AM
Post: #7
RE: bytesIn bytesOut objectSize
Ah, ok, interesting.

http://www.webpagetest.org/result/101116_CMP2/

Take for example, the raw object data for this result.

The page request has a response code of 0, bytesIn > 0, objectSize=0.
Requests with response code of 302 or 204 have bytesIn > 0, objectSize=0.
Some requests with response code of 200 have bytesIn =0, objectSize=0.
A couple of requests have bytesIn=0, objectSize=-54.
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11-18-2010, 05:02 AM
Post: #8
RE: bytesIn bytesOut objectSize
Sorry, are you looking at the raw data? If so you need to watch out for the "Transaction Type" column. The only requests that actually went on the wire are requests of type 3.

Transaction Type 0 is some summary stats for the overall page
Transaction Type 8 is for requests that were served from the browser cache (fairly recent addition to track these)

Thanks,

-Pat
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