[Libreoffice] ~2x faster gnumake ...

Michael Meeks michael.meeks at novell.com
Tue Apr 5 02:35:08 PDT 2011

Hi there,

	Weelll ... nicer structures aside; having put a breakpoint in stat64
( catch syscall stat64 FWIW ;-) - I discovered that the vast majority of
our stats were not from 'stat' at all (which clearly has been optimised
heavily) - but instead from 'glob':

	read.c (parse_file_seq) calls glob on all dependencies.

	For each of those it does a stat ;-)

	make -sr before:

real	0m5.795s
user	0m3.513s
sys	0m2.274s

	make -sr passing 'PARSEFS_NOGLOB' to the beastie[1]

real	0m2.496s
user	0m2.342s
sys	0m0.150s

	Which essentially killed the system component of performance, and saved
a truck-load of system calls ;-)

	I'll do some more poking around to make it an up-stream-able, robust



[1] - un-conditionally breaking globbing for sure but - why not ? :-)
 michael.meeks at novell.com  <><, Pseudo Engineer, itinerant idiot

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