/usr/share/doc/samhain/manual.html/performance-tuning-server.html

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><H1
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><A
NAME="PERFORMANCE-TUNING-SERVER"
>6.14. Performance tuning</A
></H1
><P
>  If connections time out because of slow network, you can raise the
  timeout with 
  <B
CLASS="COMMAND"
>SetConnectionTimeout=<TT
CLASS="REPLACEABLE"
><I
>seconds</I
></TT
></B
>
  (the default is 900 seconds).</P
><P
>  Even without tweaking, the server can probably handle some 
  100 connections per second on a 500Mhz i686. Depending on the verbosity 
  of the logging that you wish, this should suffice even for some
  thousand clients.</P
><P
>  Almost all time is spent (i) in the HMAC function that computes the
  message signatures, and (ii) if you do not have 
  the <SPAN
CLASS="APPLICATION"
>gmp</SPAN
> (GNU MP) 
  multiple precision library,
  in the multiple precision arithmetic library 
  (for SRP authentication). </P
><P
>  The reason for (ii) is that 
  <SPAN
CLASS="APPLICATION"
>samhain</SPAN
>/<SPAN
CLASS="APPLICATION"
>yule</SPAN
> 
  will use a simple, portable,
  but not very efficient MP library that is included in the source code,
  if <SPAN
CLASS="APPLICATION"
>gmp</SPAN
> is not present on your system.</P
><P
>  To improve performance, you can:</P
><P
><P
></P
><UL
><LI
><P
>  install <SPAN
CLASS="APPLICATION"
>gmp</SPAN
>, remove the file
  config.cache in the source directory (if you have run 
  <B
CLASS="COMMAND"
>configure</B
>
  before), and then run <B
CLASS="COMMAND"
>configure</B
> 
  and <B
CLASS="COMMAND"
>make</B
> again. The
  <B
CLASS="COMMAND"
>configure</B
> script should automatically 
  detect the <SPAN
CLASS="APPLICATION"
>gmp</SPAN
> library
  and link against it.
  </P
></LI
><LI
><P
>  use a simple keyed hash (HASH-TIGER), which will compute
  signatures as HASH(message key) instead of the HMAC (HMAC-TIGER). This
  will save two of the three hash computations required for a HMAC signature.
  </P
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>CAVEAT</B
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>&nbsp;</TD
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><P
>  Make sure you use the same 
  signature type on   server 
  and client !
  </P
></TD
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><PRE
CLASS="PROGRAMLISTING"
>  [Misc]  
  #  
  # use simple keyed hash for message signatures
  # Make sure you set this both for client and server
  # 
  MACType=HASH-TIGER
  </PRE
></LI
><LI
><P
>  build a static binary (use the <B
CLASS="COMMAND"
>--enable-static</B
> switch for
  configure). Static binaries are faster, and also more secure,
  because they cannot be subverted via libc.
  </P
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> 
  Unfortunately
  this is not possible on Solaris. 
  This is not a bug in <SPAN
CLASS="APPLICATION"
>samhain</SPAN
>,
  but is because some functions in Solaris are only supplied by
  dynamic libraries.
  </P
></TD
></TR
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></DIV
></LI
><LI
><P
>  change the compiler switches to optimize more aggressively.
  </P
></LI
><LI
><P
>  if on a commercial UNIX, check whether the native compiler produces
  faster code than gcc (you need an ANSI C compiler).
  The  <B
CLASS="COMMAND"
>configure</B
> script honours CC (compiler) and CFLAGS
  environment variables.
  </P
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samhain 3.1.0-5ubuntu1 / usr / share / doc / samhain / manual.html / performance-tuning-server.html
