我正在尝试使用bash脚本并行执行多个作业。作业是内存密集型的,所以我需要控制一次启动的数量。我所拥有的是下面的,它广泛运作,但有时延迟循环不知道刚刚启动的作业,因此启动了几个额外的作业,导致系统内存不足。
在延迟循环中的while语句之前添加睡眠可以减少此问题,但不会完全消除它。任何人都知道如何解决这个问题。如果相关的话,我在Solaris上运行。
#!/bin/bash
delay(){
while [ 8 -le $(ps -ef |grep myjob |wc -l) ]
do
sleep 1
done
}
./myjob -params1 &
delay
./myjob -params2 &
delay
./myjob -params3 &
delay
./myjob -params4 &
delay
.
.
.
答案 0 :(得分:2)
GNU parallel
实用程序http://www.gnu.org/software/parallel/可能是正确的工具,因为它可以说比xargs更容易使用
答案 1 :(得分:0)
使用xargs
执行此操作。传递它-n 1
以指示每个作业的一个参数,并使用--max-jobs
参数指定并发进程的数量。
答案 2 :(得分:0)
根据makefile
制定您的脚本,并让make -j N
通过Parallel Execution对其进行排序。
答案 3 :(得分:0)
首先,我将向您介绍我在几个Linux脚本中执行的操作的示例。这个应该在solaris上工作,但我目前没有任何系统可以测试。我修改了一些使用/ proc的东西,所以如果有什么不起作用,请告诉我。
#!/bin/bash
# set the max # of threads
max_threads=4
# set the max system load
max_load=4
print_jobs(){
# flush finished jobs messages
jobs > /dev/null
for x in $(jobs -p) ; do
# print all jobs
echo "$x"
done
}
job_count(){
cnt=$(print_jobs $1)
if [ -n "$cnt" ]; then
wc -l <<< "$cnt"
else
echo 0
fi
}
cur_load(){
# get the 1 minute load average integer
uptime |sed 's/.*load average[s]*:[[:space:]]*\([^.]*\)\..*/\1/g'
}
main_function(){
# get current job count and load
jcnow=$(job_count)
loadnow=$(cur_load)
# first, enter a loop waiting for load/threads to be below thresholds
while [ $loadnow -ge $max_load ] || [ $jcnow -ge $max_threads ]; do
if ! [ $firstout ]; then
echo "entering sleep loop. load: $loadnow, threads: $jcnow"
st=$(date +%s)
local firstout=true
else
now=$(date +%s)
# if it's been 5 minutes, echo again:
if [ $(($now - $st)) -ge 300 ]; then
echo "still sleeping. load: $loadnow, threads: $jcnow"
st=$(date +%s)
fi
fi
sleep 5s
# refresh these variables for loop
loadnow=$(cur_load)
jcnow=$(job_count)
unset firstout
done
( ./myjob $@ ) &
}
# do some actual work
for jobparams in "params1" "params2" "params3" "params4" "params5" "params6" "params7" ; do
main_function $jobparams
done
wait
有几点需要注意:
trap 'echo "exiting" ; rm -f $lockfile ; kill 0 ; exit' INT TERM EXIT
如果您根本不关心负载,这可能会更简单一些:
#!/bin/bash
# set the max # of threads
max_threads=4
print_jobs(){
# flush finished jobs messages
jobs > /dev/null
for x in $(jobs -p) ; do
# print all jobs
echo "$x"
done
}
job_count(){
cnt=$(print_jobs $1)
if [ -n "$cnt" ]; then
wc -l <<< "$cnt"
else
echo 0
fi
}
main_function(){
# get current job count
jcnow=$(job_count)
# first, enter a loop waiting for threads to be below thresholds
while [ $jcnow -ge $max_threads ]; do
if ! [ $firstout ]; then
echo "entering sleep loop. threads: $jcnow"
st=$(date +%s)
local firstout=true
else
now=$(date +%s)
# if it's been 5 minutes, echo again:
if [ $(($now - $st)) -ge 300 ]; then
echo "still sleeping. threads: $jcnow"
st=$(date +%s)
fi
fi
sleep 5s
# refresh these variables for loop
jcnow=$(job_count)
unset firstout
done
( ./myjob $@ ) &
}
# do some actual work
for jobparams in "params1" "params2" "params3" "params4" "params5" "params6" "params7" ; do
main_function $jobparams
done
wait