Performance Q&A
Editor's note:
Adrian Cockcroft's Performance Q&A column in Unix Insider generates more reader email than any other item. We've started to see some repetition
to your letters, so to lighten Adrian's email load and offer
you quicker access to Adrian's wisdom, we've compiled the more
frequently asked questions here.
Where can I find SymbEL
(aka "rule tool" and "SE")?
Where can I find in-depth documentation for
rule tool?
What's the highest value
ncsize can have?
How do I figure out target
drives for vmstat and iostat?
How does Solaris 2 use memory?
Is there any way to change the time slice on
Solaris?
What's a high process-switch value?
What is a "Level Red" mutex stall?
Does the current edition of your book cover SunOS 5.5?
What flags in /etc/system are related to security?
I need to reboot my Solaris 2.4 machines every two weeks. Why?
I think swap size doesn't affect performance.
How do I improve my Web server's performance?
What's the latest recommended version of Solaris for
older SPARC computers?
Should I use the SSA NVSIMM and Presto NVSIMMs together?
Any tips for Solaris X86 administrators?
We see a "Allocation errors, kmap full?"
message on SPARCstation 20 with 512 megabytes. Why?
Help me program asynchronous I/O.
How should I partition my hard disk?
Will I/O be faster on a 64-bit file system,
especially on a database application like Oracle?
What's better for a Web server: UltraSPARC or hyperSPARC?
Why shouldn't I run CacheFS on a read-write filesystem?
How do I interpret the w column in
vmstat?
How do I tune the Solaris kernel?
How can I time-out orphaned processes in Solaris?
Any performance tuning hints for Solaris 2.5?
Why do some login IDs in SunOS 4.1 accounting files
change?
Why doesn't my virtual-memory monitoring program
add up?
Are kernel memory allocation errors worth worrying
about?
How can I improve my Web server's http performance?
Does Solaris offer a vmtune-like tool?
Why are my news spool disks overloaded?
Do you have a version of SymbEL for HP-UX?
What is better, SPARC or Pentium?
Why doesn't 32 megabytes
seem like enough?
Is there a way to measure
the amount of CPU used by AIO "waiting" methods?
How many syscalls are too many?
What can I do kernel memory button in ruletool goes black?
How large can a process be in Solaris?
Q:
Where may I find ruletool?
A: I discuss a new version of the SymbEL toolkit (release
2.5) in my column "Description and Installation for SymbEL release 2.5.0.2".
If you already have the
SE Performance Toolkit Version 2.5.0.2
or have read Appendix A at the end of my book, you should be familiar
with the ten basic rules that indicate the state of parts of the system
and the action required to improve bad states. The toolkit makes it
easy
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