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Devel::Arena 0.23

Company: Nicholas Clark
Date Added: June 28, 2013  |  Visits: 286


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Inspect the arena structures that perl uses for SV allocation.<br /><br />HARNESS_PERL_SWITCHES=-MDevel::Arena=write_stats_at_END make test<br /><br />EXPORT<br /><br />None by default.<br /><br /> * sv_stats [DONT_SHARE]<br /><br /> Returns a hashref giving stats derived from inspecting the SV heads via the arena pointers. Details of the contents of the hash subject to change.<br /><br /> If the optional argument DONT_SHARE is true then none of the hashes in the returned structure have shared hash keys. This is less efficient, but is needed to calculate the effectiveness of the shared string table.<br /> * shared_string_table<br /><br /> Returns a hashref giving the share counts for each entry in the shared string table. The hashref doesn't use shared keys itself, so it doesn't affect the thing that it is measuring.<br /> * sizes<br /><br /> Returns a hashref containing sizes of various core perl types, C types, and other size related info (specifically 'hek_key offset')<br /> * HEK_size STRING<br /><br /> Calculates the size of the hash key needed to store STRING.<br /> * shared_string_table_effectiveness<br /><br /> Calculates the effectiveness of the shared string table. Returns a hashref of stats. Currently this is<br /><br /> {<br /> 'pv_unshared' => 7185,<br /> 'raw_unshared' => 77264,<br /> 'heks' => 3748,<br /> 'pv_hv' => 77264,<br /> 'hv_unshared' => 70079,<br /> 'raw_shared' => 57675,<br /> 'pvs' => 434,<br /> 'raw' => 1833<br /> };<br /><br /> It ignores malloc() overhead, and the possibility that some shared strings aren't used as hash keys or shared hash key scalars.<br /> * write_stats_at_END<br /><br /> Not really a function, but if you import write_stats_at_END then Devel::Arena will write out a Storable dump of all stats at END time. The file is written into a file into a file in the current directory named $$ . '.sv_stats'. This allows you to do things such as<br /><br /> HARNESS_PERL_SWITCHES=-MDevel::Arena=write_stats_at_END make test<br /><br /> to analyse the resource usage in regression tests.

Requirements: No special requirements
Platforms: *nix, Linux
Keyword: Arena Calculates Doesn Effectiveness Giving Hashref Needed Pvs Resource Returns Share Shared Sizes Stats String Table Types Write Stats End
Users rating: 0/10

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