mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-22 22:17:54 +00:00
43 lines
1.8 KiB
Bash
Executable file
43 lines
1.8 KiB
Bash
Executable file
#!/bin/bash
|
|
|
|
echo '### Test bug https://savannah.gnu.org/bugs/index.php?33352'
|
|
|
|
# produce input slowly to parallel so that it will reap a process
|
|
# while blocking in read()
|
|
|
|
# Having found the solution it is suddenly very easy to reproduce the
|
|
# problem - even on other hardware:
|
|
#
|
|
# perl -e '@x=1 .. 17000; for(1..30) { print "@x\n"}' | pv -qL 200000
|
|
# |parallel -j2 --pipe --keeporder --block 150000 cat | md5sum
|
|
#
|
|
# This gives different md5sums for each run.
|
|
#
|
|
# The problem is that read(STDIN) is being interrupted by a dead
|
|
# child. The chance of this happening is very small if there are few
|
|
# children dying or read(STDIN) never has to wait for data.
|
|
#
|
|
# The test above forces data to arrive slowly (using pv) which causes
|
|
# read(STDIN) to take a long time - thus being interrupted by a dead
|
|
# child.
|
|
|
|
MD5=md5sum
|
|
PAR="parallel -j2 --pipe --keeporder --block 150000 --tmpdir=/dev/shm"
|
|
perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | md5sum
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR cat | md5sum &
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR --recend '' cat | md5sum &
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR --recend '' --files cat | parallel -Xj1 cat {}';'rm {} | md5sum &
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR --recend '' --files cat | parallel -Xj1 cat {}';'rm {} | md5sum &
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR --recend '' --files --tmpdir /dev/shm cat | parallel -Xj1 cat {}';'rm {} | md5sum &
|
|
nice nice perl -e '@x=1 .. 17000; for(1..100) { print "@x\n"}' | pv -qL 1000000 | \
|
|
$PAR --recend '' --files --halt-on-error 2 cat | parallel -Xj1 cat {}';'rm {} | md5sum &
|
|
wait
|
|
|
|
|
|
|