Re: [dtrace-discuss] Trying to identify writer and/or reason for iowrite.

2008-12-09 Thread Brendan Gregg - Sun Microsystems
On Fri, Dec 05, 2008 at 05:15:09PM -0500, Jim Mauro wrote: > The problem you're running into is disk IO operations tend to occur > asynchronously to the thread that initiated the IO, so when the IO > provider probe fires, execname shows the process name for PID 0. > This is not uncommon when chasin

Re: [dtrace-discuss] Trying to identify writer and/or reason for iowrite.

2008-12-05 Thread Jim Mauro
The problem you're running into is disk IO operations tend to occur asynchronously to the thread that initiated the IO, so when the IO provider probe fires, execname shows the process name for PID 0. This is not uncommon when chasing disk and network IOs. You need to capture the write further up th

[dtrace-discuss] Trying to identify writer and/or reason for iowrite.

2008-12-05 Thread Robert Alatalo
Hello, Running the iotop dtrace script, we see many entries like UIDPID PPID CMD DEVICE MAJ MIN DBYTES 0 3 0 fsflush md3 85 3 W 512 ... ... 0 0 0 schedssd22 118 176 W 80538112 0