> Am 16.06.2021 um 18:07 schrieb Dennis Lee Bieber via fpc-pascal > <fpc-pascal@lists.freepascal.org>: > > On Wed, 16 Jun 2021 13:15:10 +0200 (CEST), Michael Van Canneyt via > fpc-pascal <fpc-pascal@lists.freepascal.org> > declaimed the following: > >> ~$ ldd /usr/bin/ls >> linux-vdso.so.1 (0x00007ffc3f9c1000) >> libselinux.so.1 => /lib/x86_64-linux-gnu/libselinux.so.1 >> (0x00007f45b7132000) >> libc.so.6 => /lib/x86_64-linux-gnu/libc.so.6 (0x00007f45b6f40000) >> libpcre2-8.so.0 => /lib/x86_64-linux-gnu/libpcre2-8.so.0 >> (0x00007f45b6eb0000) >> libdl.so.2 => /lib/x86_64-linux-gnu/libdl.so.2 (0x00007f45b6eaa000) >> /lib64/ld-linux-x86-64.so.2 (0x00007f45b718f000) >> libpthread.so.0 => /lib/x86_64-linux-gnu/libpthread.so.0 >> (0x00007f45b6e87000) >> ~$ ls -lh /lib/x86_64-linux-gnu/libselinux.so.1 >> /lib/x86_64-linux-gnu/libc-2.31.so /lib/x86_64-linux-gnu/libpcre2-8.so.0.9.0 >> /lib/x86_64-linux-gnu/libdl-2.31.so >> /lib/x86_64-linux-gnu/libpthread-2.31.so >> -rwxr-xr-x 1 root root 2.0M Dec 16 11:04 /lib/x86_64-linux-gnu/libc-2.31.so >> -rw-r--r-- 1 root root 19K Dec 16 11:04 /lib/x86_64-linux-gnu/libdl-2.31.so >> -rw-r--r-- 1 root root 571K Dec 7 2019 >> /lib/x86_64-linux-gnu/libpcre2-8.so.0.9.0 >> -rwxr-xr-x 1 root root 154K Dec 16 11:04 >> /lib/x86_64-linux-gnu/libpthread-2.31.so >> -rw-r--r-- 1 root root 160K Feb 26 2020 >> /lib/x86_64-linux-gnu/libselinux.so.1 >> >> Total size of code needed to run the application: close to 3 Mb. >> >> Comparison is different because of all kinds of memory sharing techniques, >> but in general, the code size of an FPC binary is not too bad. >> > > Being Shared Object files, there should be, at most, only one copy of > the library mapped into memory, and every executable referencing the shared > object will get mapped into the same memory space.
This still results in pulling in all static data etc. of the libraries. https://dl.acm.org/doi/10.1145/3136014.3136031 <https://dl.acm.org/doi/10.1145/3136014.3136031> shows that the FPC approach is memory wise more efficient.
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