On Mon, Sep 22, 2025 at 10:59:11AM +0400, Marc-André Lureau wrote: > Hi > > On Fri, Sep 19, 2025 at 5:50 PM Daniel P. Berrangé <[email protected]> > wrote: > > > On Fri, Sep 19, 2025 at 05:32:56PM +0400, [email protected] > > wrote: > > > From: Marc-André Lureau <[email protected]> > > > > > > Running meson on each subproject is quite slow. > > > > Why is this faster ? Does it make meson do parallel downloads > > if you list then all at once ? > > > > It doesn't look like it does it in paralllel, yet it is x times faster... > > time sh -c 'for s in keycodemapdb libvfio-user berkeley-softfloat-3 > berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs bilge-0.2-rs > bilge-impl-0.2-rs either-1-rs foreign-0.3-rs itertools-0.11-rs libc-0.2-rs > proc-macro2-1-rs proc-macro-error-1-rs proc-macro-error-attr-1-rs > quote-1-rs syn-2-rs unicode-ident-1-rs; do > meson subprojects download $s >/dev/null > done' > sh -c 5.27s user 0.33s system 99% cpu 5.613 total > > time sh -c 'meson subprojects download keycodemapdb libvfio-user > berkeley-softfloat-3 berkeley-testfloat-3 anyhow-1-rs arbitrary-int-1-rs > bilge-0.2-rs bilge-impl-0.2-rs either-1-rs foreign-0.3-rs itertools-0.11-rs > libc-0.2-rs proc-macro2-1-rs proc-macro-error-1-rs > proc-macro-error-attr-1-rs quote-1-rs syn-2-rs unicode-ident-1-rs' > sh -c 0.32s user 0.01s system 99% cpu 0.339 total
Oh I bet that 0.32secs is the overhead of python importing all modules that meson uses. Running python 18 times, gives the 5 second overhead. With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
