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17 | <title>10.2 How Is This Profiler Different From The Old Profiler?</title> | |
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55 | <H1><A NAME="SECTION0012200000000000000000"> | |
56 | 10.2 How Is This Profiler Different From The Old Profiler?</A> | |
57 | </H1> | |
58 | <A NAME="Profiler_Changes"></A> | |
59 | <P> | |
60 | (This section is of historical importance only; the old profiler | |
61 | discussed here was last seen in Python 1.1.) | |
62 | ||
63 | <P> | |
64 | The big changes from old profiling module are that you get more | |
65 | information, and you pay less CPU time. It's not a trade-off, it's a | |
66 | trade-up. | |
67 | ||
68 | <P> | |
69 | To be specific: | |
70 | ||
71 | <P> | |
72 | <DL> | |
73 | <DT><STRONG>Bugs removed:</STRONG></DT> | |
74 | <DD>Local stack frame is no longer molested, execution time is now charged | |
75 | to correct functions. | |
76 | ||
77 | <P> | |
78 | </DD> | |
79 | <DT><STRONG>Accuracy increased:</STRONG></DT> | |
80 | <DD>Profiler execution time is no longer charged to user's code, | |
81 | calibration for platform is supported, file reads are not done <em>by</em> | |
82 | profiler <em>during</em> profiling (and charged to user's code!). | |
83 | ||
84 | <P> | |
85 | </DD> | |
86 | <DT><STRONG>Speed increased:</STRONG></DT> | |
87 | <DD>Overhead CPU cost was reduced by more than a factor of two (perhaps a | |
88 | factor of five), lightweight profiler module is all that must be | |
89 | loaded, and the report generating module (<tt class="module">pstats</tt>) is not needed | |
90 | during profiling. | |
91 | ||
92 | <P> | |
93 | </DD> | |
94 | <DT><STRONG>Recursive functions support:</STRONG></DT> | |
95 | <DD>Cumulative times in recursive functions are correctly calculated; | |
96 | recursive entries are counted. | |
97 | ||
98 | <P> | |
99 | </DD> | |
100 | <DT><STRONG>Large growth in report generating UI:</STRONG></DT> | |
101 | <DD>Distinct profiles runs can be added together forming a comprehensive | |
102 | report; functions that import statistics take arbitrary lists of | |
103 | files; sorting criteria is now based on keywords (instead of 4 integer | |
104 | options); reports shows what functions were profiled as well as what | |
105 | profile file was referenced; output format has been improved. | |
106 | ||
107 | <P> | |
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147 | <span class="release-info">Release 2.4.2, documentation updated on 28 September 2005.</span> | |
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