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+<HTML> |
+<HEAD> |
+<!-- Created by texi2html 1.56k from gperf.texi on 12 June 2003 --> |
+ |
+<TITLE>Perfect Hash Function Generator - 5. Known Bugs and Limitations with gperf</TITLE> |
+</HEAD> |
+<BODY> |
+Go to the <A HREF="gperf_1.html">first</A>, <A HREF="gperf_6.html">previous</A>, <A HREF="gperf_8.html">next</A>, <A HREF="gperf_10.html">last</A> section, <A HREF="gperf_toc.html">table of contents</A>. |
+<P><HR><P> |
+ |
+ |
+<H1><A NAME="SEC25" HREF="gperf_toc.html#TOC25">5. Known Bugs and Limitations with <CODE>gperf</CODE></A></H1> |
+ |
+<P> |
+The following are some limitations with the current release of |
+<CODE>gperf</CODE>: |
+ |
+ |
+ |
+<UL> |
+<LI> |
+ |
+The <CODE>gperf</CODE> utility is tuned to execute quickly, and works quickly |
+for small to medium size data sets (around 1000 keywords). It is |
+extremely useful for maintaining perfect hash functions for compiler |
+keyword sets. Several recent enhancements now enable <CODE>gperf</CODE> to |
+work efficiently on much larger keyword sets (over 15,000 keywords). |
+When processing large keyword sets it helps greatly to have over 8 megs |
+of RAM. |
+ |
+<LI> |
+ |
+The size of the generate static keyword array can get <EM>extremely</EM> |
+large if the input keyword file is large or if the keywords are quite |
+similar. This tends to slow down the compilation of the generated C |
+code, and <EM>greatly</EM> inflates the object code size. If this |
+situation occurs, consider using the <SAMP>`-S'</SAMP> option to reduce data |
+size, potentially increasing keyword recognition time a negligible |
+amount. Since many C compilers cannot correctly generate code for |
+large switch statements it is important to qualify the <VAR>-S</VAR> option |
+with an appropriate numerical argument that controls the number of |
+switch statements generated. |
+ |
+<LI> |
+ |
+The maximum number of selected byte positions has an |
+arbitrary limit of 255. This restriction should be removed, and if |
+anyone considers this a problem write me and let me know so I can remove |
+the constraint. |
+</UL> |
+ |
+<P><HR><P> |
+Go to the <A HREF="gperf_1.html">first</A>, <A HREF="gperf_6.html">previous</A>, <A HREF="gperf_8.html">next</A>, <A HREF="gperf_10.html">last</A> section, <A HREF="gperf_toc.html">table of contents</A>. |
+</BODY> |
+</HTML> |
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