DTrace

I'm currently participating under DTrace OpenSolaris community . Here you can find several educational resources about DTrace and DTraceToolkit

Contents

This section is dedicated to DTrace framework.

OneLiners

Useful examples of how to construct one line commands in D language in order to debug certain situations.

General System Calls Count by Application $ dtrace -n 'syscall:::entry{@[execname] = count();}' System Calls Count by Application and Process $ dtrace -n 'syscall:::entry{@[execname,pid] = count();}' How many times a file has been opened $ dtrace -n 'syscall::open:entry{@[copyinstr(arg0)] = count();}' Files Opened by process $ dtrace -qn 'syscall::open*:entry{ printf("%s %s\n",execname,copyinstr(arg0)); }' Read Bytes by process $ dtrace -n 'sysinfo:::readch{ @[execname] = sum(arg0);}' Write Bytes by process $ dtrace -n 'sysinfo:::writech{ @[execname] = sum(arg0);}' How big a read is $ dtrace -n 'syscall::read:entry{@[execname] = quantize(arg2);}' How big a write is $ dtrace -n 'syscall::write:entry{@[execname] = quantize(arg2);}' Disk size by process $ dtrace -qn 'io:::start{printf("%d %s %d\n",pid,execname,args[0]->b_bcount); }' High system time $ dtrace -n profile-501'{@[stack()] = count()}END{trunc(@, 25)}' What processes are using fork $ dtrace -n 'syscall::fork*:entry{printf("%s %d",execname,pid);}' My application is doing nothing $ dtrace -n sched:::off-cpu'{@[ustack()] = count()}' -p pid

DTraceToolkit Presentation

You can find below a short presentation about DTrace framework found on Solaris 10 and about DTraceToolkit: a big collection of D scripts developed to help your life. There is a partial translation of the DTT presentation in japanese done by: Kenji Funasaki, thanks Kenji! OpenOffice 2.x was used to edit these files.
This is work in progress !

DTraceToolkit Bugtracker

References

• OpenSolaris Community: DTrace

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Created: 2006-12-24
Last updated: 2007-10-01