On Tue, Jan 20, 2015 at 02:01:13AM +0000, Pádraig Brady wrote: > On 30/12/14 22:06, Bernhard Voelker wrote: > > I just pulled the recent gnulib update, and now the above, expensive > > test fails: > > > > + ulimit -v 40000 > > + du -sh d > > du: fts_read failed: d: Cannot allocate memory > > + fail=1 > > > > I guess this due to the inclusion of libmount? > > Yes I get the same issue in that test: > http://git.sv.gnu.org/gitweb/?p=coreutils.git;a=blob;f=tests/rm/many-dir-entries-vs-OOM.sh > > Indeed there is significant overhead in using libmount as shown below. > This is a crazy amount of overhead just to read /proc/self/mountinfo, > and is the sort of creeping dependencies I hate. The proposed solution > in the attached gnulib patch, is to require ./configure --with-libmount > to enable this feature. I.E. it's disabled by default. > > cheers, > Pádraig > > ======= without ========= > $ (ulimit -v 5380; du -s .) > > $ ldd /usr/bin/du > linux-vdso.so.1 => (0x00007fff0d7fe000) > libc.so.6 => /lib64/libc.so.6 (0x00007fd414a32000) > /lib64/ld-linux-x86-64.so.2 (0x00007fd414e0b000) > > $ time du -s src/du.c >/dev/null > real 0m0.003s > user 0m0.000s > sys 0m0.003s > > ======= with ========= > $ (ulimit -v 23250; src/du -s .) > > $ ldd src/du > linux-vdso.so.1 => (0x00007fff76ca8000) > libc.so.6 => /lib64/libc.so.6 (0x00007f2a1f742000) > /lib64/ld-linux-x86-64.so.2 (0x00007f2a1fd61000) > libmount.so.1 => /lib64/libmount.so.1 (0x00007f2a1faff000) > libblkid.so.1 => /lib64/libblkid.so.1 (0x00007f2a1f501000) > libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f2a1f2fc000) > libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f2a1f0d7000) > libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f2a1ee69000) > liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f2a1ec44000) > libdl.so.2 => /lib64/libdl.so.2 (0x00007f2a1ea40000) > libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2a1e823000) The problem is libselinux, but on selinux based system you have all the libraries already in memory for many another tools... Karel -- Karel Zak <kzak@xxxxxxxxxx> http://karelzak.blogspot.com -- To unsubscribe from this list: send the line "unsubscribe util-linux" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
