On Mon, 8 Dec 2003, Doug White wrote: > On Mon, 8 Dec 2003, Gordon Bergling wrote: > > > I run 'make -j 32 buildkernel' to stressing my fresh 5.2-RC installation a > > little bit and saw some strange pids in a 'ps ax'. (The output of 'ps > > ax' is stripped down.) > > > > ----------------------------------------------------------------------- > > 24111 p2 S+ 0:00.81 make -j 32 buildkernel KERNCONF=NEMESIS-UP > > > > 0 p2 ZW+ 0:00.00 (sh) > > These are normal. make just hasn't gotten around to clearing these yet. > make spawns and reaps processes in groups rather than keeping the -j > number busy at all times. > > Note that -j32 is much more than the system can paralleize. I start > getting dimishing returns past -j4, even on dual proc systems. When you > hit the rescue build you will be SORRY :) > > If you want to do load tests, launch multiple parallel buildworlds with > differing MAKEOBJDIRPREFIX. Zombies should have non-zero pids. This appears to be OK in -STABLE, and broken in -CURRENT. Obtuse test program below. -STABLE: fledge:/tmp> ps ux| grep fork robert 12400 0.0 0.1 864 308 pa S 4:48PM 0:00.01 ./fork robert 12401 0.0 0.0 0 0 pa Z 4:48PM 0:00.00 (fork) -CURRENT: sproing:/projects/cboss/management> ps aux | grep fork rwatson 27392 0.0 0.1 1212 528 p9 S+ 4:50PM 0:00.01 ./fork rwatson 0 0.0 0.0 0 0 p9 ZW+ - 0:00.00 (fork) Since we don't want pids reused until after wait() has finished (or it becomes ambiguous which process is being reaped for return values, etc), this seems like a problem. Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert_at_fledge.watson.org Senior Research Scientist, McAfee Research #include <unistd.h> int main(int argc, char *argv) { if (fork() != 0) sleep(10); }Received on Mon Dec 08 2003 - 12:50:49 UTC
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:37:33 UTC