[dtrace-discuss] DTrace and I/O
Hye everyboy, I try to obtain the REAL size of I/O in block or Ko in order to know how ZFS manage the block size. I've tried the io provider with this-byte_size = args[0]-b_bcount; this-kibi_byte_size = this-byte_size/1024; but my results seems strange ( block of 56 ko with UFS ... ) How can i retrieve REAL block size for I/O ? Thanks R. -- This message posted from opensolaris.org ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] DTrace and I/O
You're looking at byte counts, not block sizes. 56kb sounds typical for UFS, which uses an 8k block size, with 1k frags (default), so you'll typically see IO sizes to/from UFS in multiples of 8k. The actually amount of IO depends of course on several factors. You can also just use iostat data. For reads, divide kbytes reads by reads-per-second to get the physical IO size for a given row of data. (same for writes). /jim Ferrand wrote: Hye everyboy, I try to obtain the REAL size of I/O in block or Ko in order to know how ZFS manage the block size. I've tried the io provider with this-byte_size = args[0]-b_bcount; this-kibi_byte_size = this-byte_size/1024; but my results seems strange ( block of 56 ko with UFS ... ) How can i retrieve REAL block size for I/O ? Thanks R. ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] dtrace
On Tuesday, March 17, 2009, at 4:11 am, gautham k wrote: hello everyone can i get some example on how to integrate dtrace with scripting language Take a look at the examples in DtraceToolkit, several of which combine scripting languages and dtrace. In OpenSolaris, this is the SUNWDtraceToolkit package, which is installed in /opt/DTT. It is also available as a tar ball from http://opensolaris.org/os/community/dtrace/dtracetoolkit/ HTH, David ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
Re: [dtrace-discuss] dtrace
On Tue, Mar 17, 2009 at 7:20 PM, David Lutz david.l...@sun.com wrote: On Tuesday, March 17, 2009, at 4:11 am, gautham k wrote: hello everyone can i get some example on how to integrate dtrace with scripting language Take a look at the examples in DtraceToolkit, several of which combine scripting languages and dtrace. In OpenSolaris, this is the SUNWDtraceToolkit package, which is installed in /opt/DTT. It is also available as a tar ball from http://opensolaris.org/os/community/dtrace/dtracetoolkit/ Also, please take a look at a similar discussion on BOSUG: http://opensolaris.org/jive/thread.jspa?threadID=96871tstart=0 -Amit -- http://amitksaha.blogspot.com http://amitsaha.in.googlepages.com/ *Bangalore Open Java Users Group*:http:www.bojug.in Recursion is the basic iteration mechanism in Scheme --- http://c2.com/cgi/wiki?TailRecursion ___ dtrace-discuss mailing list dtrace-discuss@opensolaris.org
