Re: A good OS centric discussion on performance
- From: Tanel Põder <tanel.poder.003@xxxxxxx>
- To: "ORACLE-L" <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 21 Feb 2006 18:43:58 -0700
Hi,
Search for "dynamic instrumentation" or "dynamic binary instrumentation" with
AIX, HP-UX or other OS keyword.
There are really lots of such tools available, developed mostly by HPC &
academic people. Most of such products work by rewriting binary code in memory
during load or runtime. This means that in order to have a stable, foolproof
and high-performing dynamic instrumentation framework, you have to implement it
from very bottom of your OS. DTrace is doing pretty well in this area, their
instrumentation code is also in the kernel.
Many other instrumentation tools use ptrace() interface, which imposes some
limitations, as not being able to launch a debugger on the process when running
in instrumented mode. Some tools require spawning the process using
instrumentation tool, some can attach to an already running process and
instrument it on the fly.
However, with dynamic instrumentation tools (especially the non-kernel ones) we
have to be very careful - a tool which can instrument "ls" perfectly, might
crash when dealing with forking, IPC, shared memory etc...
Few other keywords not already mentioned in the article: linux trace toolkit
(LTT), Dyninst, Pintool, valgrind, callgrind, kprobes
Tanel.
----- Original Message -----
From: Allen, Brandon
To: john.kanagaraj@xxxxxxx ; oracle-l@xxxxxxxxxxxxx
Sent: Tuesday, February 21, 2006 1:28 PM
Subject: RE: A good OS centric discussion on performance
Yep, good article. Is anyone aware of anything similar to Solaris' DTrace
for HPUX or AIX?
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx]On
Behalf Of John Kanagaraj
Sent: Tuesday, February 21, 2006 11:21 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: A good OS centric discussion on performance
Hi all,
http://acmqueue.com/modules.php?name=Content&pa=showpage&pid=363&page=1
Came across this link (from a SQLServer newsletter of all places!) This is a
very interesting Q & A from a "Cary" clone (if I may use this term!) in the
UNIX/Linux/Java/C world. It is a bit long, but he does cover a lot of ground.
Cheers,
John Kanagaraj <><
DB Soft Inc
Phone: 408-970-7002 (W)
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