How can I improve overall system performance? Updated: 05/03/02


There are, of course, many answers to this question. Many people have
noticed that HP's conservative choices in some configuration areas affect
performance, especially as compared to Solaris. A couple examples:

o 'fs_async' kernel parameter

HP-UX by default makes all file systems I/O synchronous. Sun[R],
by contrast, defaults to asynchronous I/O and depends on the
syncer.
Changing this parameter's value from 0 to 1 can significantly
increase write speeds, BUT at the risk of losing data in a system
crash. You can change this parameter using SAM.

o 'async' NFS option

Similar to local writes, NFS writes to a filesystem exported from
an
HP-UX system are synchronous by default. Add the async option to
your /etc/exports if you want to change that, but be sure to
carefully read the exports(4) manpage first.

An abundance of performance tuning tips are provided by HP in the
following
tuning guides:

o HP-UX Workstation System Tuning and Performance Guide, 08/31/00:

<http://www.hp-partners.com/tcl_public/html/technical_support/tuning.html>

o HP-UX Kernel Tuning and Performance Guide v3.1, 03/15/00:
<http://docs.hp.com/hpux/onlinedocs/os/11.0/tuningwp.html>



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