Hi Daniel,
One script has 10k probes, but they are rarely triggered. Another script has only one probe, but the probe triggered 10k per second. Which one will impact the OS performance to a larger extent? In another word: performance impact depends on the number of probes or times any probe triggered in a second?
A short answer: performance will be affected more when probes are being fired. Probe enablings that exist but aren't fired are essentially free. If you haven't yet read it you should read the 2004 Usenix paper that the team did: http://www.sun.com/bigadmin/content/dtrace/dtrace_usenix.pdf Essential introductory reading for anyone who wants to understand the basics of how DTrace does what it does. Jon. _______________________________________________ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
