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Special Forums UNIX and Linux Applications Virtualization and Cloud Computing Amazon CloudFront / S3 Small Object Test Results Post 302325537 by Neo on Friday 22nd of May 2009 08:01:00 AM
Old 05-22-2009
Amazon CloudFront / S3 Small Object Test Results

After some initial confusing results measuring "before-and-after CloudFront/S3" performance, Dennis Opacki, Systems Operations Manager for Amazon Cloudfront offered to help. Working with the test results from a number of members of The UNIX and Linux Forums pulling a small 1623 byte gif object with curl -s -w, we compiled the test results. For each location, we discarded the fastest and slowest times for the Origin Web Server (in Ireland) and the CloudFront (CF) sites and averaged the remaining three samples. The last two columns in the table below represents the difference in performance between the objects hosted. The data seems to suggest a fairly significant performance improvement (with Amazon CloudFront) for all locations worldwide except Ireland, which is not surprising, since Ireland is the location of the original server.


.Web Server (WS) in IrelandCloudFront (CF)Compare Performance (CF/WS)
Client LocationWS First-byte(s)WS Total Transfer(s)CF First-byte(s)CF Total(s)First-byte (%)Total Transfer (%)
Ireland 0.096 0.0970.1010.1016%4%
Netherlands0.1230.1240.0810.081-34%-35%
St Paul, MN0.4720.4740.2840.286-39%-40%
Sofia, Bulgaria0.1340.1340.0810.081-40%-40%
Milan, Italy0.1110.1120.0420.042-63%-63%
Seattle, WA0.5150.5160.1330.134-74%-74%
Redwood City, CA0.3240.3270.0410.045-86%-86%
Ashburn, VA0.1880.1890.0220.022-88%-88%
Hong Kong0.9440.9440.0480.048-95%-95%

As expected, the most improvement was from users in the US and Asia (Hong Kong), since the original web server resides in Ireland.

I want to thank all the members of The Unix and Linux Forums who took the time to run the tests and for Dennis of Amazon for helping compile the results.

Congratulations Amazon Web Services and CloudFront!!

Note: Our test results suggest that static web content hosted on Amazon's CDN can certainly help global user response time downloading (small) objects. This is what you would expect from a CDN.
 

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Test::Harness::Straps(3pm)				 Perl Programmers Reference Guide				Test::Harness::Straps(3pm)

NAME
Test::Harness::Straps - detailed analysis of test results SYNOPSIS
use Test::Harness::Straps; my $strap = Test::Harness::Straps->new; # Various ways to interpret a test my %results = $strap->analyze($name, @test_output); my %results = $strap->analyze_fh($name, $test_filehandle); my %results = $strap->analyze_file($test_file); # UNIMPLEMENTED my %total = $strap->total_results; # Altering the behavior of the strap UNIMPLEMENTED my $verbose_output = $strap->dump_verbose(); $strap->dump_verbose_fh($output_filehandle); DESCRIPTION
THIS IS ALPHA SOFTWARE in that the interface is subject to change in incompatible ways. It is otherwise stable. Test::Harness is limited to printing out its results. This makes analysis of the test results difficult for anything but a human. To make it easier for programs to work with test results, we provide Test::Harness::Straps. Instead of printing the results, straps provide them as raw data. You can also configure how the tests are to be run. The interface is currently incomplete. Please contact the author if you'd like a feature added or something change or just have comments. Construction new my $strap = Test::Harness::Straps->new; Initialize a new strap. Analysis analyze my %results = $strap->analyze($name, @test_output); Analyzes the output of a single test, assigning it the given $name for use in the total report. Returns the %results of the test. See Results. @test_output should be the raw output from the test, including newlines. analyze_fh my %results = $strap->analyze_fh($name, $test_filehandle); Like "analyze", but it reads from the given filehandle. analyze_file my %results = $strap->analyze_file($test_file); Like "analyze", but it runs the given $test_file and parses it's results. It will also use that name for the total report. Results The %results returned from analyze() contain the following information: passing true if the whole test is considered a pass (or skipped), false if its a failure exit the exit code of the test run, if from a file wait the wait code of the test run, if from a file max total tests which should have been run seen total tests actually seen skip_all if the whole test was skipped, this will contain the reason. ok number of tests which passed (including todo and skips) todo number of todo tests seen bonus number of todo tests which unexpectedly passed skip number of tests skipped So a successful test should have max == seen == ok. There is one final item, the details. details an array ref reporting the result of each test looks like this: $results{details}[$test_num - 1] = { ok => is the test considered ok? actual_ok => did it literally say 'ok'? name => name of the test (if any) type => 'skip' or 'todo' (if any) reason => reason for the above (if any) }; Element 0 of the details is test #1. I tried it with element 1 being #1 and 0 being empty, this is less awkward. EXAMPLES
See examples/mini_harness.plx for an example of use. AUTHOR
Michael G Schwern <schwern@pobox.com> SEE ALSO
Test::Harness perl v5.8.0 2002-06-01 Test::Harness::Straps(3pm)
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