On Wed, Nov 2, 2011 at 7:49 AM, Premi, Sanjeev <[email protected]> wrote: >> -----Original Message----- >> From: [email protected] >> [mailto:[email protected]] On Behalf Of Wolfgang Denk >> Sent: Wednesday, November 02, 2011 12:24 PM >> To: [email protected] >> Cc: Graeme Russ; Kumar Gala; Albert Aribaud; Andy Fleming >> Subject: [U-Boot] [PATCH] Reduce build times >> >> U-Boot Makefiles contain a number of tests for compiler features etc. >> which so far are executed again and again. On some architectures >> (especially ARM) this results in a large number of calls to gcc. >> >> This patch makes sure to run such tests only once, thus largely >> reducing the number of "execve" system calls. >> >> Example: number of "execve" system calls for building the "P2020DS" >> (Power Architecture) and "qong" (ARM) boards, measured as: >> -> strace -f -e trace=execve -o /tmp/foo ./MAKEALL <board> >> -> grep execve /tmp/foo | wc -l >> >> Before: After: Reduction: >> ================================== >> P2020DS 20555 15205 -26% >> qong 31692 14490 -54% >> >> As a result, built times are significantly reduced, typically by >> 30...50%. >> >> Signed-off-by: Wolfgang Denk <[email protected]> >> Cc: Andy Fleming <[email protected]> >> Cc: Kumar Gala <[email protected]> >> Cc: Albert Aribaud <[email protected]> >> cc: Graeme Russ <[email protected]> >> cc: Mike Frysinger <[email protected]> >> --- > > Results for OMAP3EVM. > (Tried 5 times just to be sure as I see >50% reduction.) > > Before After > ------ ------ > real 109.03 49.78 > user 71.43 29.06 > sys 26.83 7.66
Over here omap3_evm wall-clock time on make -j12 goes from 27sec to 10sec. -- Tom _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
