12-15-2003
now, this is bizarre!!! have i gone insane or is 32.2-29.2 not equal to 3.0????
code:
################################
#! /usr/local/bin/perl -w
$slice_thickness = 3.0;
if (31.2-28.2 == $slice_thickness) {
print "It worked!\n";
}
else {
print "ughhhh!\n";
}
if (32.2-29.2 == $slice_thickness) {
print "It worked!\n";
}
else {
print "ughhhh!\n";
}
################################
result:
################################
It worked!
ughhhh!
################################
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rwsnoop(1m) USER COMMANDS rwsnoop(1m)
NAME
rwsnoop - snoop read/write events. Uses DTrace.
SYNOPSIS
rwsnoop [-jPtvZ] [-n name] [-p PID]
DESCRIPTION
This is measuring reads and writes at the application level. This matches the syscalls read, write, pread and pwrite.
Since this uses DTrace, only users with root privileges can run this command.
OPTIONS
-j print project ID
-P print parent process ID
-t print timestamp, us
-v print time, string
-Z print zone ID
-n name
process name to track
-p PID PID to track
EXAMPLES
Default output,
# rwsnoop
Print zone ID,
# rwsnoop -.Monitor processes named "bash", # rwsnoop -n bash
FIELDS
TIME timestamp, us
TIMESTR
time, string
ZONE zone ID
PROJ project ID
UID user ID
PID process ID
PPID parent process ID
CMD command name for the process
D direction, Read or Write
BYTES total bytes during sample
FILE filename, if file based. Reads and writes that are not file based, for example with sockets, will print "<unknown>" as the file-
name.
DOCUMENTATION
See the DTraceToolkit for further documentation under the Docs directory. The DTraceToolkit docs may include full worked examples with ver-
bose descriptions explaining the output.
EXIT
rwsnoop will run forever until Ctrl-C is hit.
AUTHOR
Brendan Gregg [Sydney, Australia]
SEE ALSO
rwtop(1M), dtrace(1M)
version 0.70 Jul 24, 2005 rwsnoop(1m)