Showing content from http://www.ensembl.org/info/docs/webcode/dev/debugging.html below:
Debugging and profiling
Debugging and profiling the Ensembl website $SiteDefs::ENSEMBL_DEBUG_FLAGS
In your plugins you can set the value of the EnsEMBL debug flags so that you can control what messages appear in the error logs.
## Turn on Perl profiling output.
$SiteDefs::ENSEMBL_DEBUG_FLAGS |= $SiteDefs::ENSEMBL_PERL_PROFILER;
## Turn off Long process warnings
$SiteDefs::ENSEMBL_DEBUG_FLAGS &= ~$SiteDefs::ENSEMBL_DEBUG_LONG_PROCESS;
A full list of flags are:
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$SiteDefs::ENSEMBL_DEBUG_JAVASCRIPT_DEBUG
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Include a Debug div in the webpage in which errors warnings and timings are logged.
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$SiteDefs::ENSEMBL_DEBUG_MAGIC_MESSAGES
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EnsEMBL::Web::Magic module displays a textual description of each request if this flag is set.
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$SiteDefs::ENSEMBL_DEBUG_REFERER
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For debugging AJAX etc - print out the parsed web-request
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$SiteDefs::ENSEMBL_DEBUG_TREE_DUMPS
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Textual dump of the image configuration trees.
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$SiteDefs::ENSEMBL_DEBUG_TIMESTAMPED_LOGS
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If set log files are stamped with the time the server is started.
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$SiteDefs::ENSEMBL_DEBUG_PERL_PROFILER
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At various points in the code there are in built profiling statements - set this flag to dump them to the logs at the end of the request.
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$SiteDefs::ENSEMBL_DEBUG_LONG_PROCESS
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Display information about requests that last more than a certain number of seconds.
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$SiteDefs::ENSEMBL_DEBUG_HANDLER_ERRORS
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Include some detailed error messages while the server is routing the request.
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$SiteDefs::ENSEMBL_DEBUG_SD_AUTOLOADER
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Various shouts in the EnsEMBL::Web::SpeciesDefs AUTOLOAD function.
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$SiteDefs::ENSEMBL_DEBUG_DRAWING_CODE
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Informational messages from the drawing code.
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$SiteDefs::ENSEMBL_DEBUG_GENERAL_ERRORS
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Show some general error messages
Profiling the code - EnsEMBL::Web::Timer
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