> From: <s_g...@telus.net> > Date: Tue, 1 May 2018 16:30:28 -0700 > > Why is the gtk libtool so slow on arm? A typical command such as:
It's not libtool, but ld, the link editor that is taking its time. > libtool: link: cc -o .libs/testentrycompletion -pthread -O2 -pipe -g -Wall > -Wl,-rpath-link -Wl,/usr/X11R6/lib -Wl,-rpath-link -Wl,/usr/X11R6/lib > testentrycompletion.o -L.libs -lgtk-3 -lgdk-3 -lpangocairo-1.0 -lpango-1.0 > -lgobject-2.0 -lglib-2.0 -liconv -lpcre -lintl -lffi -lc++abi -lgthread-2.0 > -lfribidi -lm -lcairo -lpthread -lpixman-1 -lfontconfig -lfreetype -lz > -lexpat -lpng -lxcb-shm -lxcb -lxcb-render -lXrender -lX11 -lXext > -lpangoft2-1.0 -lharfbuzz -lgraphite2 -lgdk_pixbuf-2.0 -lgmodule-2.0 > -lgio-2.0 -lcairo-gobject -lXinerama -lXi -lXrandr -lXcursor -lXfixes > -lXcomposite -lXdamage -lepoxy -latk-1.0 -latk-bridge-2.0 -ldbus-1 -latspi > -Wl,-rpath-link,/usr/local/lib,-rpath-link,/usr/X11R6/lib That is linking in quite a number of libraries, some of which are fairly sizeable. > takes from 15 to 20 minutes on arm. It is all cpu time, not i/o: The binutils linker is quite crappy. The LLVM linker is better. > load averages: 2.03, 2.02, 2.00 op1bsdsnap.graf.lan > 16:26:21 > > 78 processes: 1 running, 76 idle, 1 on processor up 4 days, > 7:42 > > CPU states: 99.6% user, 0.0% nice, 0.4% system, 0.0% interrupt, 0.0% > idle > > Memory: Real: 59M/234M act/tot Free: 259M Cache: 98M Swap: 11M/516M > > > > PID USERNAME PRI NICE SIZE RES STATE WAIT TIME CPU COMMAND > > 12051 root 64 0 7680K 8532K run - 6:44 99.12% ld > > 27209 sysadmin 2 0 972K 984K idle select 0:49 0.00% sshd > > 65728 _pflogd 4 0 716K 172K sleep bpf 0:29 0.00% pflogd > > I set up an i386 virtual system with one cpu at 3 GHz and the whole gtk > build including all the dependencies took a few hours. My gtk build on an > arm orangepi with a 1.2GHz cpu has been running for over 48 hours, all due > to libtool. A cc compile finishes in seconds. The orangepi probably runs at a lower speed since DVFS isn't implemented yet. And the Cortex-A7 simply isn't a very powerful CPU as it is completely in-order. Memory bandwidth on the orangepi is probably limited as well.
