On Wed, Nov 2, 2011 at 8:37 AM, Tom Rini <[email protected]> wrote: > 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]>
Tested-by: Simon Glass <[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 > For Tegra2 Seaboard (armv7) and -j15 or so: before and after times: full build (clobber, config) 17.177s -> 7.060s incremental build 7.432s -> 2.267s Thank you! Regards, Simon _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
