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Oracle Solaris Dynamic Tracing Guide     Oracle Solaris 11 Information Library
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Document Information


1.  About DTrace

2.  D Programming Language

3.  Aggregations

4.  Actions and Subroutines

5.  Buffers and Buffering

Principal Buffers

Principal Buffer Policies

switch Policy

fill Policy

fill Policy and END Probes

ring Policy

Other Buffers

Buffer Sizes

Buffer Resizing Policy

6.  Output Formatting

7.  Speculative Tracing

8.  dtrace(1M) Utility

9.  Scripting

10.  Options and Tunables

11.  Providers

12.  User Process Tracing

13.  Statically Defined Tracing for User Applications

14.  Security

15.  Anonymous Tracing

16.  Postmortem Tracing

17.  Performance Considerations

18.  Stability

19.  Translators

20.  Versioning

Buffer Sizes

The size of each buffer can be tuned on a per-consumer basis. Separate options are provided to tune each buffer size, as shown in the following table:

Size Option

Each of these options is set with a value that denotes the size. As with any size option, the value may have an optional size suffix. See Chapter 10, Options and Tunables for more details. For example, to set the buffer size to one megabyte on the command line to dtrace, you can use -x to set the option:

# dtrace -P syscall -x bufsize=1m

Alternatively, you can use the -b option to dtrace:

# dtrace -P syscall -b 1m

Finally, you could can set bufsize using #pragma D option:

#pragma D option bufsize=1m

The buffer size you select denotes the size of the buffer on each CPU. Moreover, for the switch buffer policy, bufsize denotes the size of each buffer on each CPU. The buffer size defaults to four megabytes.