Date: Sun, 18 Sep 2011 01:49:15 +0200 From: "Ronald Klop" <ronald-freebsd8@klop.yi.org> To: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org> Subject: /usr/bin/script eating 100% cpu with portupgrade and xargs Message-ID: <op.v1y8gdtf8527sy@pinky>
next in thread | raw e-mail | index | archive | help
Hi,
I'm running portupgrade in screen to update all the ports for
9-BETA2/9-CURRENT on amd64. While doing this script eats 100% cpu.
Because portupgrade -fa crashed I'm running this command to update the
remaining non-updates ports.
find /var/db/pkg -name +DESC -mtime +2 |cut -d / -f 5 | xargs time nice -n
20 portupgrade -f
The output of truss -p `pgrep script` is this:
clock_gettime(13,{1316301104.000000000 }) = 0 (0x0)
select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1)
read(0,0x7fffffffcdf0,1024) = 0 (0x0)
write(4,0x7fffffffcdf0,0) = 0 (0x0)
clock_gettime(13,{1316301104.000000000 }) = 0 (0x0)
select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1)
read(0,0x7fffffffcdf0,1024) = 0 (0x0)
write(4,0x7fffffffcdf0,0) = 0 (0x0)
clock_gettime(13,{1316301104.000000000 }) = 0 (0x0)
select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1)
read(0,0x7fffffffcdf0,1024) = 0 (0x0)
write(4,0x7fffffffcdf0,0) = 0 (0x0)
clock_gettime(13,{1316301104.000000000 }) = 0 (0x0)
select(5,{0 4},0x0,0x0,{30.000000 }) = 1 (0x1)
read(0,0x7fffffffcdf0,1024) = 0 (0x0)
write(4,0x7fffffffcdf0,0) = 0 (0x0)
So it is really fast in reading and writing 0 bytes most of the time.
I also found http://web.archiveorange.com/archive/v/6ETvLvjo60Gj9geAUAb6
and I think I am better of by rewriting my command so stdin/stdout is
still the terminal. Although the link is a couple of years old.
Is this known? Can somebody explain me why my xargs command is not working
well?
Ronald.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?op.v1y8gdtf8527sy>