128 lines
5.0 KiB
Plaintext
128 lines
5.0 KiB
Plaintext
The following is a demonstration of the weblatency.d script.
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Here we run weblatency.d while a mozilla browser loads the
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http://www.planetsolaris.org website. After the website was loaded, Ctrl-C
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was hit to print the following report,
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# weblatency.d
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Tracing... Hit Ctrl-C to end.
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^C
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HOST NUM
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static.flickr.com 1
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images.pegasosppc.com 1
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www.planetsolaris.org 5
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blogs.sun.com 7
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HOST AVGTIME(ms)
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static.flickr.com 65
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blogs.sun.com 285
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images.pegasosppc.com 491
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www.planetsolaris.org 757
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HOST MAXTIME(ms)
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static.flickr.com 65
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images.pegasosppc.com 491
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blogs.sun.com 962
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www.planetsolaris.org 3689
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This gives us an understanding on which hosts were responsible for the
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time endured while loading the website. It turns out that requests to
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www.planetsolaris.org were the slowest, with a maximum time of 3.7 seconds
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(probably the first request, which incurred a DNS lookup).
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The following shows the same google lookup performed on a number of sites,
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# weblatency.d
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Tracing... Hit Ctrl-C to end.
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^C
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HOST NUM
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www.google.com.au 3
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www.google.co.uk 3
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www.google.com 3
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www.google.co.nz 3
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HOST AVGTIME(ms)
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www.google.co.nz 450
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www.google.com.au 502
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www.google.com 567
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www.google.co.uk 595
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HOST MAXTIME(ms)
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www.google.co.nz 544
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www.google.com.au 559
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www.google.com 744
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www.google.co.uk 763
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From the average time you would guess that I was running this from
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New Zealand (the fastest), with times to the other hosts following suit
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(Australia, USA, UK). I was actually running this from Australia - it's
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interesting that the New Zealand server responded slightly faster.
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Now several websites are loaded as a larger demonstration,
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# weblatency.d
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Tracing... Hit Ctrl-C to end.
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^C
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HOST NUM
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shop.abc.net.au 1
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static.technorati.com 1
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sunopensolaris.112.2o7.net 1
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www.theage.com.au 1
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ffxcam.smh.com.au 1
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sunglobal.112.2o7.net 2
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embed.technorati.com 2
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technorati.com 2
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fdimages.fairfax.com.au 4
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blogs.sun.com 5
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bugs.opensolaris.org 7
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www.abc.net.au 34
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www.smh.com.au 51
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HOST AVGTIME(ms)
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ffxcam.smh.com.au 0
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sunglobal.112.2o7.net 0
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www.abc.net.au 56
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www.theage.com.au 64
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shop.abc.net.au 65
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www.smh.com.au 73
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fdimages.fairfax.com.au 88
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blogs.sun.com 130
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bugs.opensolaris.org 162
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static.technorati.com 350
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technorati.com 352
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embed.technorati.com 632
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sunopensolaris.112.2o7.net 900
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HOST MAXTIME(ms)
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ffxcam.smh.com.au 0
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sunglobal.112.2o7.net 0
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www.theage.com.au 64
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shop.abc.net.au 65
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fdimages.fairfax.com.au 243
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www.smh.com.au 244
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blogs.sun.com 293
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www.abc.net.au 315
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static.technorati.com 350
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technorati.com 356
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bugs.opensolaris.org 560
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sunopensolaris.112.2o7.net 900
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embed.technorati.com 973
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It's interesting that the most common host (www.smh.com.au, NUM == 51),
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responded with a fast AVGTIME (73 ms). The reason for this may be due to
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cacheing by my proxy server. Less common hosts such as embed.technorati.com
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were quite slow.
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The results from weblatency.d are interesting, but they don't point the
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finger at one single cause for website latency. The value here is the response
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time experienced by the client - which is a combination of many response
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times (link speeds, proxy server, DNS server, web server).
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