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bug#7489: [coreutils] over aggressive threads in sort
From: |
Jim Meyering |
Subject: |
bug#7489: [coreutils] over aggressive threads in sort |
Date: |
Thu, 02 Dec 2010 22:42:57 +0100 |
Chen Guo wrote:
> Hi Professor Eggert,
> On Mon, Nov 29, 2010 at 11:16 AM, Paul Eggert <address@hidden> wrote:
>> (for i in $(seq 12); do read line; echo $i; sleep .1; done
>> cat > /dev/null) < fifo &
>> (ulimit -t 1; ./sort in > fifo \
>> || echo killed via $(env kill -l $(expr $? - 128)))
>
> I ran this 10 times or so on an i7 and couldn't trigger anything. Is
> seq 12 supposed to vary depending on the number of cores?
Hi Chen,
Here's a stand-alone command-line test using the sort in your PATH:
rm -f in fifo
seq 100000 > in
mkfifo fifo
(for i in $(seq 12); do read line; echo $i; sleep .1; done
cat > /dev/null) < fifo &
(ulimit -t 1; sort in > fifo \
|| echo killed via $(env kill -l $(expr $? - 128)))
The 12 x 0.1-second sleeps are to ensure that the busy-waiting
sort will accumulate more than 1.0 seconds of CPU time, and thus
surpass the CPU time limit imposed by "ulimit -t 1".
With more processes, then you may use a number smaller than 12.
Running on a 6-core i7, I see the "killed via XCPU" message
anywhere between the "1" and "4" output lines. E.g.,
1
2
killed via XCPU
$ 3
:
4
5
6
7
8
9
10
11
12
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/01
- bug#7489: [coreutils] over aggressive threads in sort, Paul Eggert, 2010/12/01
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/02
- bug#7489: [coreutils] over aggressive threads in sort, Paul Eggert, 2010/12/02
- bug#7489: [coreutils] over aggressive threads in sort,
Jim Meyering <=
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/03
- bug#7489: [coreutils] over aggressive threads in sort, Paul Eggert, 2010/12/03
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/06
- bug#7489: [coreutils] over aggressive threads in sort, Paul Eggert, 2010/12/06
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/06
- bug#7489: [coreutils] over aggressive threads in sort, Jim Meyering, 2010/12/07
- bug#7489: [coreutils] over aggressive threads in sort, Jim Meyering, 2010/12/07
- bug#7489: [coreutils] over aggressive threads in sort, Chen Guo, 2010/12/07
- bug#7597: multi-threaded sort can segfault (unrelated to the sort -u segfault), Jim Meyering, 2010/12/09
- bug#7597: [coreutils] multi-threaded sort can segfault (unrelated to the sort -u segfault), Jim Meyering, 2010/12/09