Date: Thu, 19 Jun 2014 17:44:04 +0200 From: Magnus Nilsson <magnus.nilsson@gmail.com> To: freebsd-embedded@freebsd.org Subject: Strange slowdown of zlib. Message-ID: <CAHWWKwM_ETrPGZ1fPc451Hn=iCVEb9Z7qj2X0HEz-znwuR_k=w@mail.gmail.com>
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I have the strangest behaviour of zlib on FreeBSD 8.2 (ARM, but I don't think it's necessarily an ARM specific issue). Doing # md5 /lib/libz.so.5 or # cp /lib/libz.so.5 /tmp/ # export LD_LIBRARY_PATH=/tmp/ slows down applications (I've tested bsdtar and gzip) using zlib to a crawl on my system. In the later case, doing # unset LD_LIBRARY_PATH reverts the issue. However, I haven't found any way to recover from the first case, apart from rebooting - then the execution time is back to normal. Here is a log of what I describe above (first moving zlib, then doing the md5): # cp some2MBfile /tmp/ # time gzip /tmp/some2MBfile real 0m0.325s user 0m0.284s sys 0m0.037s # rm /tmp/some2MBfile.gz # cp /lib/libz.so.5 /tmp/ # export LD_LIBRARY_PATH=/tmp/ # cp some2MBfile /tmp/ # time gzip /tmp/some2MBfile real 0m11.949s user 0m11.635s sys 0m0.035s # rm /tmp/some2MBfile.gz # unset LD_LIBRARY_PATH # cp some2MBfile /tmp/ # time gzip /tmp/some2MBfile real 0m0.325s user 0m0.288s sys 0m0.035s # rm /tmp/some2MBfile.gz # md5 /lib/libz.so.5 # cp some2MBfile /tmp/ # time gzip /tmp/some2MBfile real 0m11.919s user 0m11.608s sys 0m0.031s # rm /tmp/some2MBfile.gz Do you have any idea what could be going on? Any clues are welcome. Kind regards/Magnus
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