[Webkit-unassigned] [Bug 240162] [Flatpak SDK] Update mold to version 1.2.1

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=240162

--- Comment #1 from Adrian Perez <aperez at igalia.com> ---
Here there's some numbers for my build machine, making an initial
RelWithDebInfo build, removing bin/* and lib/*.so* from the build
directory and then measuring how much it takes for the build to
complete, in order to (mostly) measure link time:

Mold                            LLD                     
usr     sys     wall            usr     sys     wall    

45,94   1,64    48,77           56,86   79,31   46,27   
42,32   1,19    44,48           60,09   77,43   49,78   
45,69   1,33    48,19           56,30   74,35   46,04   
42,19   1,29    44,65           60,19   78,22   49,77   
45,54   1,73    48,52           56,56   79,41   46,33   

44,03   1,36    46,52           58,36   77,33   47,96   avg

                                1,33x   56,75x  1,03x   diff

Something very interesting to note is that the wall time for both
linkers is quite similar, but LLD is taking considerably more user
and system time than Mold. Neither manage to bring CPU usage up
to 100% across all 64 cores in my build machine, which means the
bottleneck here is disk access.

On machines with higher I/O thoroughput (better bus, better drives,
RAID-0 arrangement, etc.), the faster the disk access gets, the
faster using Mold will be.

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