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'make randconfig' uses glibc's rand function, and the seed of that PRNG is set via: srand(time(NULL)); But 'time()' only increases once every second - freezing the randconfig result within a single second. My Nehalem testbox does randconfig much faster than 1 second and i have a few scripts that do 'randconfig until condition X' loops. Those scripts currently waste a lot of CPU time due to randconfig changing its seed only once per second currently. Change the seed to be micrseconds based. (I checked the statistical spread of the seed - the now.tv_sec*now.tv_usec multiplication there further improves it.) Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Roman Zippel <zippel@linux-m68k.org> [sam: fix for systems where usec is zero - noticed by Geert Uytterhoeven] Signed-off-by: Sam Ravnborg <sam@ravnborg.org> |
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| .. | ||
| lxdialog | ||
| .gitignore | ||
| check.sh | ||
| conf.c | ||
| confdata.c | ||
| expr.c | ||
| expr.h | ||
| gconf.c | ||
| gconf.glade | ||
| images.c | ||
| kconfig_load.c | ||
| kxgettext.c | ||
| lex.zconf.c_shipped | ||
| lkc.h | ||
| lkc_proto.h | ||
| Makefile | ||
| mconf.c | ||
| menu.c | ||
| POTFILES.in | ||
| qconf.cc | ||
| qconf.h | ||
| symbol.c | ||
| util.c | ||
| zconf.gperf | ||
| zconf.hash.c_shipped | ||
| zconf.l | ||
| zconf.tab.c_shipped | ||
| zconf.y | ||