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><A
NAME="PGTESTFSYNC"
></A
><SPAN
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>pg_test_fsync</SPAN
></H1
><DIV
CLASS="REFNAMEDIV"
><A
NAME="AEN154154"
></A
><H2
>Name</H2
>pg_test_fsync&nbsp;--&nbsp;determine fastest wal_sync_method for <SPAN
CLASS="PRODUCTNAME"
>PostgreSQL</SPAN
></DIV
><DIV
CLASS="REFSYNOPSISDIV"
><A
NAME="AEN154160"
></A
><H2
>Synopsis</H2
><P
><TT
CLASS="COMMAND"
>pg_test_fsync</TT
> [<TT
CLASS="REPLACEABLE"
><I
>option</I
></TT
>...]</P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN154165"
></A
><H2
>Description</H2
><P
>  <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> is intended to give you a reasonable
  idea of what the fastest <A
HREF="runtime-config-wal.html#GUC-WAL-SYNC-METHOD"
>wal_sync_method</A
> is on your
  specific system,
  as well as supplying diagnostic information in the event of an
  identified I/O problem.  However, differences shown by <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
>
  might not make any difference in real database throughput, especially
  since many database servers are not speed-limited by their transaction
  logs.
 </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN154171"
></A
><H2
>Options</H2
><P
>    <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> accepts the following
    command-line options:

    <P
></P
></P><DIV
CLASS="VARIABLELIST"
><DL
><DT
><TT
CLASS="OPTION"
>-f</TT
><BR><TT
CLASS="OPTION"
>--filename</TT
></DT
><DD
><P
>        Specifies the file name to write test data in.
        This file should be in the same file system that the
        <TT
CLASS="FILENAME"
>pg_xlog</TT
> directory is or will be placed in.
        (<TT
CLASS="FILENAME"
>pg_xlog</TT
> contains the <ACRONYM
CLASS="ACRONYM"
>WAL</ACRONYM
> files.)
        The default is <TT
CLASS="FILENAME"
>pg_test_fsync.out</TT
> in the current
        directory.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-s</TT
><BR><TT
CLASS="OPTION"
>--secs-per-test</TT
></DT
><DD
><P
>        Specifies the number of seconds for each test.  The more time
        per test, the greater the test's accuracy, but the longer it takes
        to run.  The default is 2 seconds, which allows the program to
        complete in about 30 seconds.
       </P
></DD
><DT
><TT
CLASS="OPTION"
>-V</TT
><BR><TT
CLASS="OPTION"
>--version</TT
></DT
><DD
><P
>        Print the <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> version and exit.
       </P
></DD
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><TT
CLASS="OPTION"
>-?</TT
><BR><TT
CLASS="OPTION"
>--help</TT
></DT
><DD
><P
>        Show help about <SPAN
CLASS="APPLICATION"
>pg_test_fsync</SPAN
> command line
        arguments, and exit.
       </P
></DD
></DL
></DIV
><P>
   </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN154210"
></A
><H2
>Author</H2
><P
>   Bruce Momjian <CODE
CLASS="EMAIL"
>&#60;<A
HREF="mailto:bruce@momjian.us"
>bruce@momjian.us</A
>&#62;</CODE
>
  </P
></DIV
><DIV
CLASS="REFSECT1"
><A
NAME="AEN154214"
></A
><H2
>See Also</H2
><A
HREF="app-postgres.html"
><SPAN
CLASS="APPLICATION"
>postgres</SPAN
></A
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