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Monday, November 22. 2004DTrace: as easy as it gets
I'm slowly getting used to seeing and using DTrace in my everydays work...
For example, here's a start of the most basic analysis. The system is constantly busy with something, and our task is to find what's responsible for this. How? One of the possible solutions is to simply watch the system for a certain period of time (5 seconds in our case) to see what process makes most system calles... And it's clearly seen now that the most active consumer of system calls is Java VM which happens to run a very complex graphics applet at this very moment. As for rxvt terminals, we're seeing so many calls simply because we're building our list based on the command name and not PID, so in the table we really see the cumulative number of system calls made by roughly 40 terminals I've got running on my box, and not a single session as one might think. Had I done the PID-based list, all the 40+ rxvt processes would have shown separately. Here it goes: dtrace -n syscall:::entry'{@[execname] = count()} tick-5sec {printa(@); clear(@);}' And this is the result of such a command line. Every 5 seconds you'll see an output similar to this: CODE: dtrace: description 'syscall:::entry' matched 227 probes
CPU ID FUNCTION:NAME 1 36588 :tick-5sec svc.configd 1 expect 3 telnet 4 svc.startd 6 sendmail 10 thunderbird-bin 10 htt_server 10 nscd 13 mozilla-bin 19 soffice.bin 77 xautolock 106 dtrace 173 icewm 225 Xorg 874 rxvt 2008 java_vm 2651 Trackbacks
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Спасибо, я в курсе ;) И с командами prstat и truss/apptrace я знаком :)
Просто хотелось показать, как подобный анализ делается с помощью DTrace. |