Orz日記 by Akio Morita

_ [FreeBSD]make -j8 buildworld

% grep ^CPU /var/run/dmesg.boot
CPU: Quad-Core AMD Opteron(tm) Processor 2376 (2300.11-MHz K8-class CPU)

な環境で、NO_BLUETOOH, NO_LPR, NO_SENDMAIL, NO_BIND付き

BDECFLAGS=      -W -Wall -ansi -pedantic -Wbad-function-cast -Wcast-align \\
                -Wcast-qual -Wchar-subscripts -Winline \\
                -Wmissing-prototypes -Wnested-externs -Wpointer-arith \\
                -Wredundant-decls -Wshadow -Wstrict-prototypes -Wwrite-strings
CFLAGS= -O2 -fno-strict-aliasing -pipe

で実行した結果

--------------------------------------------------------------
>>> World build completed on Tue Mar 10 20:47:45 JST 2009
--------------------------------------------------------------
3561.490u 1076.600s 18:52.50 409.5%     6078+2008k 29714+7580io 4041pf+0w

実効並列度は、4が限界の模様

Y氏のニューマシン より遅いのは、最適化 or I/O回りが原因か？