10-19-2007
I usually use strace to have an idea of what a program is doing. Of course, if you do not have some C programming background the output may not make enough sense to you. It outputs the system calls being called. You can look at the neighbouring system calls around places where large latencies occur to give you an idea what happened at that time.
One possibility that I encounter recently is that reverse DNS of IPv4 addresses is down or simply being slow. In that case, the SSH process may need to timeout before trying another one. MySQL has similar issues as well.
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LEARN ABOUT OPENSOLARIS
strace
strace(1M) System Administration Commands strace(1M)
NAME
strace - print STREAMS trace messages
SYNOPSIS
strace [mid sid level]...
DESCRIPTION
strace without arguments writes all STREAMS event trace messages from all drivers and modules to its standard output. These messages are
obtained from the STREAMS log driver (see log(7D)). If arguments are provided, they must be in triplets of the form mid, sid, level, where
mid is a STREAMS module ID number, sid is a sub-ID number, and level is a tracing priority level. Each triplet indicates that tracing
messages are to be received from the given module/driver, sub-ID (usually indicating minor device), and priority level equal to, or less
than the given level. The token all may be used for any member to indicate no restriction for that attribute.
The format of each trace message output is:
<seq> <time> <ticks> <level> <flags> <mid> <sid> <text>
<seq> trace sequence number
<time> time of message in hh:mm:ss
<ticks> time of message in machine ticks since boot
<level> tracing priority level
<flags> E : message is also in the error log F : indicates a fatal error N : mail was sent to the system administrator (hardcoded as
root)
<mid> module ID number of source
<sid> sub-ID number of source
<text> formatted text of the trace message
Once initiated, strace will continue to execute until terminated by the user.
EXAMPLES
Example 1 A sample output of the strace command:
The following example outputs all trace messages from the module or driver whose module ID is 41:
strace 41 all all
The following example outputs those trace messages from driver or module ID 41 with sub-IDs 0, 1, or 2:
strace 41 0 1 41 1 1 41 2 0
Messages from sub-IDs 0 and 1 must have a tracing level less than or equal to 1. Those from sub-ID 2 must have a tracing level of 0.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO
attributes(5), log(7D)
NOTES
o There is no restriction to the number of strace processes opening the STREAMS log driver at a time.
o The log-driver records the list of the triplets specified in the command invocation, and compares each potential trace message
against this list to decide if it should be formatted and sent up to the strace process. Hence, long lists of triplets will have
a greater impact on overall STREAMS performance. Running strace will have the most impact on the timing of the modules and
drivers generating the trace messages that are sent to the strace process. If trace messages are generated faster than the
strace process can handle them, some of the messages will be lost. This last case can be determined by examining the sequence
numbers on the trace messages output.
SunOS 5.11 4 Oct 1994 strace(1M)