I've noticed that with the release of 10.4.x that the performance of
iterative 'do shell script' commands is noticeably decreased compared
to performance under the later 10.3.x releases. I've built a 'speed
test' application to document this issue that loops through 2500
counts of the shell script 'whoami' and then displays the time that
the loop took. The code was compiled with XCode 2.1's 'release' flag
set. Replacing the 'whoami' command with various other shell
commands yields similar results.
I ran the speed test application on two 'vanilla' OS X installs on
the same computer, one under 10.4.2 and the other under 10.3.9. 10
tests were performed per launch, and the time averaged for each set
of runs. Spotlight wasn't indexing at the time of the 10.4.2 test,
and both user accounts were freshly generated and no other foreground
processes (besides the Finder) were running. CPU usage was nominal
under both OSes before initiation of the test procedures
The results are as follows:
10.3.9 - 74.90 second average for 10 runs
10.4.2 - 85.80 second average for 10 runs
The 10.4.2 times were almost 15% slower than the time the exact same
code took to execute under 10.3.9. Are any other folks seeing slower
iterative execution of 'do shell script' commands under 10.4.x
installs? After fighting so hard for years to squeeze increased
performance from my AppleScript Studio application, it's
disheartening to lose performance to this issue as folks upgrade to
10.4.
Best,
Steve Elliott
Babel Company
P.S. - The code I used to conduct these tests lists as follows:
on clicked
set t to (time of (current date))
repeat with i from 1 to 2500
try
do shell script "whoami"
on error
exit repeat
end try
end repeat
log (((time of (current date)) - t) as string) & " seconds"
end clicked
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