search for: iosnoop

G''Day Folks, I''ve just rewritten iosnoop so that uses command line arguments (I caved in and used a little Bourne shell for this - hence it''s lost it''s ".d" extension). It''s much more useful now. # iosnoop -h USAGE: iosnoop [-a|-A|-Degstv] [-d device] [-f filename] [-m mount_point]...

I am teaching a DTrace class and a student noticed that 2 iosnoop scripts run in two different windows were producing different results. I was not able to answer why this is. Can anyone explain this. Here are the reults from the two windows: # io.d ... sched 0 <none> 1024 dad1 W 0.156 bash 1...

hello anyone faced this error before? dtrace: processing aborted: Abort due to systemic unresponsiveness I used iosnoop -evD > iosnoop.log thanks. __________________________________________________________ Sent from Yahoo! Mail - a smarter inbox http://uk.mail.yahoo.com

I''m curious to know what files are being used from a NFS server perspective. I''m unable to trace the client because it is in the boot phase. Looking at the io provider, I believe it does not allow you to look at what files are being requested. That would lead me to the fbt provider. Does anyone know what fbt provides the file handle for NFS client request on the NFS

Hello, I''m a newby to dtrace and have just installed the dtrace toolkit v0.92 on a core soalris 10 1/06 installation on SUN v40z. I have tried the following commands: iotop iosnoop but I get the message dtrace: invalid probe specifier and a lot of code. At the end it says: : in action list: failed to resolve uid: Unknown variable name Could it be, that there are some things missing in the core installation? thanks for every reply Peter

I have been using iosoop script (see http://www.opensolaris.org/os/community/dtrace/scripts/) written by Brendan Gregg to look at the IO operations of my application. When I was running my test-program on a UFS filesystem I could see both read and write operations like: UID PID D BLOCK SIZE COMM PATHNAME 203803 4436 R 6016592 16384 diskio <none> 203803 4436 W 3448432

...h one of our applications that does a lot of writing, generally blocks just over 32K, sequentially writing large files. It''s a Solaris 10 x86 system with UFS disk. We''re often only seeing disk write throughput of around 6-8MB/s, even when there is minimal read activity. Running iosnoop shows that most of the physical writes are made by the actual app and average around 32KB. About 15% of the data, however, is done by fsflush and only 4 or 8KB at a time. The write throughput for the fsflush writes is about 10% that of the app writes (using the "DTIME" values and aggreg...

I''m working on a case where customer has a 3rd party streams driver/module, called uplink, which sits over Sun''s ce driver. This 3rd party module is used by the telco to perform telco grade NIC failover. The customer was given an IDR ce driver, to avoid a panic they were given. The IDR driver was successful in avoiding the panic, but now the customer is getting many

Hi, I''m working on some performance analysis with our database and it seems that when the file system (UFS) is mounted with forcedirectio, the IO probe are not triggered when an I/O event occurs. Could you confirm that ? If so, why ? Seb -- This message posted from opensolaris.org

We run our IMAP spool on ZFS that''s derived from LUNs on a Netapp filer. There''s a great deal of churn in e-mail folders, with messages appearing and being deleted frequently. I know that ZFS uses copy-on- write, so that blocks in use are never overwritten, and that deleted blocks are added to a free list. This behavior would spread the free list all over the zpool. As well,

Hello, I use Brendan''s sysperfstat script to see the overall system performance and found the the disk utilization is over 100: 15:51:38 14.52 15.01 200.00 24.42 0.00 0.00 83.53 0.00 15:51:42 11.37 15.01 200.00 25.48 0.00 0.00 88.43 0.00 ------ Utilisation ------ ------ Saturation ------ Time %CPU %Mem %Disk %Net CPU Mem

Does anyone out there have any thoughts on the type of load common DTrace scripts would cause on a system if run 24x7? I know "common DTrace scripts" and their underlining probe calls a vague statement. So for the lack of a common and establish set of scripts in the OS, I''ll use the most popular right for my question...the DTraceToolkit from Brendan Gregg. Which by the

Howdy, Is there a method to get the number of elements in an aggregation? Are the results stored in an aggregation guaranteed to be in any type of order? Thanks for any insight, - Ryan -- UNIX Administrator http://daemons.net/~matty

...t an expert in dtrace, but what I take from this is that of the total execution time (measured at 40 seconds), only 0.63 seconds is spent actually executing on the CPU. Q1: Is this a correct interpretation? Suspecting that perhaps this ''missing'' time was spent in I/O, I executed iosnoop while the program ran, with the following results: STRTIME ? ? ? ? ? ? ?DEVICE ?MAJ MIN ? UID ? PID D ? ?BLOCK ? SIZE ? ? ? ? ? ? ? ?PATHNAME ARGS 2010 Mar 18 09:22:55 sd1 ? ? ?32 ?13 10054 20116 R 32569904 ? 8192 /var/tmp/test-crystal/lib/cr/CrystalReportsRuntime.jar 2010 Mar 18 09:22:55 sd1 ? ?...

zdb -C shows an shift value on each vdev in my pool, I was just wondering if it is vdev specific, or pool wide. Google didn''t seem to know. I''m considering a mixed pool with some "advanced format" (4KB sector) drives, and some normal 512B sector drives, and was wondering if the ashift can be set per vdev, or only per pool. Theoretically, this would save me some size on