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Commit659df79

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Update FAQ_DEV.
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‎doc/FAQ_DEV‎

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Developer's Frequently Asked Questions (FAQ) for PostgreSQL
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Last updated:Tue Aug 13 16:41:02 EDT 2002
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Last updated:Sat Nov 2 23:02:16 EST 2002
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Current maintainer: Bruce Momjian (pgman@candle.pha.pa.us)
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1.6) What books are good for developers?
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1.7) What is configure all about?
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1.8) How do I add a new port?
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1.9) Why don't we use threads in the backend?
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1.9) Why don't you use threads/raw devices/async-I/O, &insert your
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favorite wizz-bang feature here&?
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1.10) How are RPM's packaged?
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1.11) How are CVS branches handled?
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1.12) Where can I get a copy of the SQL standards?
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src/makefiles directory for port-specific Makefile handling. There is
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a backend/port directory if you need special files for your OS.
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1.9) Why don't we use threads in the backend?
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1.9) Why don't you use threads/raw devices/async-I/O, &insert your favorite
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wizz-bang feature here&?
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There are several reasons threads are not used:
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There is always a temptation to use the newest operating system
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features as soon as they arrive. We resist that temptation.
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First, we support 15+ operating systems, so any new feature has to be
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well established before we will consider it. Second, most new
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wizz-bang features don't provide dramatic improvements. Third, the
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usually have some downside, such as decreased reliability or
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additional code required. Therefore, we don't rush to use new features
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but rather wait for the feature to be established, then ask for
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testing to show that a measurable improvement is possible.
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As an example, threads are not currently used in the backend code
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because:
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* Historically, threads were unsupported and buggy.
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* An error in one backend can corrupt other backends.
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* Speed improvements using threads are small compared to the
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remaining backend startup time.
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* The backend code would be more complex.
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So, we are not "asleep at the switch" as they say with regard to new
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features, it is just that we are cautious about their adoption. The
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TODO list often contains links to discussions showing our reasoning in
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these areas.
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1.10) How are RPM's packaged?
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This was written by Lamar Owen:

‎doc/src/FAQ/FAQ_DEV.html‎

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<H1>Developer's Frequently Asked Questions (FAQ) for
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PostgreSQL</H1>
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<P>Last updated:Tue Aug 13 16:41:02 EDT 2002</P>
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<P>Last updated:Sat Nov 2 23:02:16 EST 2002</P>
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<P>Current maintainer: Bruce Momjian (<Ahref=
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"mailto:pgman@candle.pha.pa.us">pgman@candle.pha.pa.us</A>)<BR>
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<Ahref="#1.6">1.6</A>) What books are good for developers?<BR>
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<Ahref="#1.7">1.7</A>) What is configure all about?<BR>
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<Ahref="#1.8">1.8</A>) How do I add a new port?<BR>
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<Ahref="#1.9">1.9</A>) Why don't we use threads in the backend?<BR>
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<Ahref="#1.9">1.9</A>) Why don't you use threads/raw
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devices/async-I/O, &amp;insert your favorite wizz-bang feature
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here&amp;?<BR>
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<Ahref="#1.10">1.10</A>) How are RPM's packaged?<BR>
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<Ahref="#1.11">1.11</A>) How are CVS branches handled?<BR>
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<Ahref="#1.12">1.12</A>) Where can I get a copy of the SQL
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handling. There is a<I>backend/port</I> directory if you need
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special files for your OS.</P>
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<H3><Aname="1.9">1.9</A>) Why don't we use threads in the
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backend?</H3>
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<H3><Aname="1.9">1.9</A>) Why don't you use threads/raw
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devices/async-I/O, &amp;insert your favorite wizz-bang feature
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here&amp;?</H3>
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<P>There are several reasons threads are not used:</P>
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<P>There is always a temptation to use the newest operating system
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features as soon as they arrive. We resist that temptation.</P>
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<P>First, we support 15+ operating systems, so any new feature has
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to be well established before we will consider it. Second, most new
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<I>wizz-bang</I> features don't provide<I>dramatic</I>
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improvements. Third, the usually have some downside, such as
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decreased reliability or additional code required. Therefore, we
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don't rush to use new features but rather wait for the feature to be
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established, then ask for testing to show that a measurable
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improvement is possible.</P>
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<P>As an example, threads are not currently used in the backend code
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because:</P>
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<UL>
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<LI>Historically, threads were unsupported and buggy.</LI>
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<LI>The backend code would be more complex.</LI>
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</UL>
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<P>So, we are not "asleep at the switch" as they say with regard to
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new features, it is just that we are cautious about their
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adoption. The TODO list often contains links to discussions
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showing our reasoning in these areas.</P>
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<H3><Aname="1.10">1.10</A>) How are RPM's packaged?</H3>
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<P>This was written by Lamar Owen:</P>

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