Sat 26 Apr 2014 04:35:15 PM UTC, comment #1:
~/source/GNU/findutils$ rm -f /tmp/TRACE-simple.txt /tmp/test-simple.find /tmp/TRACE-complex.txt /tmp/test-complex.find; \
strace -tt -o /tmp/TRACE-simple.txt /home/james/source/GNU/findutils/installed-64/bin/find-4.2.27 . -type f > /tmp/test-simple.find ; \
strace -tt -o /tmp/TRACE-complex.txt /home/james/source/GNU/findutils/installed-64/bin/find-4.2.27 . -type f -amin -1440 -a -amin +30 > /tmp/test-complex.find
~/source/GNU/findutils$ for f in /tmp/TRACE-simple.txt /tmp/TRACE-complex.txt ; do echo; echo "${f}"; sed -n -f firstwrite.sed < "${f}"; sed -n -e '$ p' < "${f}"; done
/tmp/TRACE-simple.txt
17:17:07.195124 execve("/home/james/source/GNU/findutils/installed-64/bin/find-4.2.27", ["/home/james/source/GNU/findutils"..., ".", "-type", "f"], [/* 42 vars */]) = 0
17:17:07.216931 write(1, "./xfind/patch-for-findutils-4.1."..., 4096) = 4096
17:17:14.894501 exit_group(1) = ?
/tmp/TRACE-complex.txt
17:17:14.901656 execve("/home/james/source/GNU/findutils/installed-64/bin/find-4.2.27", ["/home/james/source/GNU/findutils"..., ".", "-type", "f", "-amin", "-1440", "-a", "-amin", "+30"], [/* 42 vars */]) = 0
17:17:22.103478 write(2, "/home/james/source/GNU/findutils"..., 63) = 63
17:17:40.617822 exit_group(1) = ?
As you can see in the second example, there is a significant delay between find's start and the first output. This is because more conditions are specified, so fewer files match. But there is also a significant delay between the first output and the program exit. This demonstrates that the output is not being written at the end of the execution of the program.
You're likely also seeing the effect of stdio buffering. See http://www.gnu.org/software/libc/manual/html_node/Stream-Buffering.html for a brief explanation.
Lastly, findutils 4.2.27 (the release against which you made this bug report) is very old now (it was released on 2005-12-06). Please upgrade.
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