在Linux下,如何发现哪个进程使用交换空间更多?
当前回答
使用smem
smem -s swap -r
这里有一个链接,告诉你如何安装和如何使用它:http://www.cyberciti.biz/faq/linux-which-process-is-using-swap/
其他回答
给出使用交换的进程的总数和百分比
smem -t -p
来源:https://www.cyberciti.biz/faq/linux-which-process-is-using-swap/
我在网上改编了一个不同的脚本来写这句长单句:
{ date;for f in /proc/[0-9]*/status; do
awk '{k[$1]=$2} END { if (k["VmSwap:"]) print k["Pid:"],k["Name:"],k["VmSwap:"];}' $f 2>/dev/null;
done | sort -n ; }
然后我将其扔进cronjob并将输出重定向到日志文件。这里的信息与在smaps文件中积累Swap:条目相同,但如果你想确定,你可以使用:
{ date;for m in /proc/*/smaps;do
awk '/^Swap/ {s+=$2} END { if (s) print FILENAME,s }' $m 2>/dev/null;
done | tr -dc ' [0-9]\n' |sort -k 1n; }
这个版本的输出有两列:pid,交换量。在上面的版本中,tr删除非数值组件。在这两种情况下,输出都是按照pid数值排序的。
运行top,然后按OpEnter。现在进程应该根据它们的交换使用情况进行排序。
这是一个更新,因为我原来的答案没有提供一个确切的答案,在评论中指出的问题。从htop常见问题:
It is not possible to get the exact size of used swap space of a process. Top fakes this information by making SWAP = VIRT - RES, but that is not a good metric, because other stuff such as video memory counts on VIRT as well (for example: top says my X process is using 81M of swap, but it also reports my system as a whole is using only 2M of swap. Therefore, I will not add a similar Swap column to htop because I don't know a reliable way to get this information (actually, I don't think it's possible to get an exact number, because of shared pages).
另一种在shell中避免循环的脚本变体:
#!/bin/bash
grep VmSwap /proc/[0-9]*/status | awk -F':' -v sort="$1" '
{
split($1,pid,"/") # Split first field on /
split($3,swp," ") # Split third field on space
cmdlinefile = "/proc/"pid[3]"/cmdline" # Build the cmdline filepath
getline pname[pid[3]] < cmdlinefile # Get the command line from pid
swap[pid[3]] = sprintf("%6i %s",swp[1],swp[2]) # Store the swap used (with unit to avoid rebuilding at print)
sum+=swp[1] # Sum the swap
}
END {
OFS="\t" # Change the output separator to tabulation
print "Pid","Swap used","Command line" # Print header
if(sort) {
getline max_pid < "/proc/sys/kernel/pid_max"
for(p=1;p<=max_pid;p++) {
if(p in pname) print p,swap[p],pname[p] # print the values
}
} else {
for(p in pname) { # Loop over all pids found
print p,swap[p],pname[p] # print the values
}
}
print "Total swap used:",sum # print the sum
}'
标准用法是script.sh以随机顺序获取每个程序的使用情况(直到awk如何存储其哈希值)或script.sh 1以pid对输出进行排序。
我希望我已经对代码进行了足够的注释,以说明它的功能。
这是脚本的另一个变体,但意味着提供更可读的输出(你需要以根用户身份运行这个脚本才能得到准确的结果):
#!/bin/bash
# find-out-what-is-using-your-swap.sh
# -- Get current swap usage for all running processes
# --
# -- rev.0.3, 2012-09-03, Jan Smid - alignment and intendation, sorting
# -- rev.0.2, 2012-08-09, Mikko Rantalainen - pipe the output to "sort -nk3" to get sorted output
# -- rev.0.1, 2011-05-27, Erik Ljungstrom - initial version
SCRIPT_NAME=`basename $0`;
SORT="kb"; # {pid|kB|name} as first parameter, [default: kb]
[ "$1" != "" ] && { SORT="$1"; }
[ ! -x `which mktemp` ] && { echo "ERROR: mktemp is not available!"; exit; }
MKTEMP=`which mktemp`;
TMP=`${MKTEMP} -d`;
[ ! -d "${TMP}" ] && { echo "ERROR: unable to create temp dir!"; exit; }
>${TMP}/${SCRIPT_NAME}.pid;
>${TMP}/${SCRIPT_NAME}.kb;
>${TMP}/${SCRIPT_NAME}.name;
SUM=0;
OVERALL=0;
echo "${OVERALL}" > ${TMP}/${SCRIPT_NAME}.overal;
for DIR in `find /proc/ -maxdepth 1 -type d -regex "^/proc/[0-9]+"`;
do
PID=`echo $DIR | cut -d / -f 3`
PROGNAME=`ps -p $PID -o comm --no-headers`
for SWAP in `grep Swap $DIR/smaps 2>/dev/null| awk '{ print $2 }'`
do
let SUM=$SUM+$SWAP
done
if (( $SUM > 0 ));
then
echo -n ".";
echo -e "${PID}\t${SUM}\t${PROGNAME}" >> ${TMP}/${SCRIPT_NAME}.pid;
echo -e "${SUM}\t${PID}\t${PROGNAME}" >> ${TMP}/${SCRIPT_NAME}.kb;
echo -e "${PROGNAME}\t${SUM}\t${PID}" >> ${TMP}/${SCRIPT_NAME}.name;
fi
let OVERALL=$OVERALL+$SUM
SUM=0
done
echo "${OVERALL}" > ${TMP}/${SCRIPT_NAME}.overal;
echo;
echo "Overall swap used: ${OVERALL} kB";
echo "========================================";
case "${SORT}" in
name )
echo -e "name\tkB\tpid";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.name|sort -r;
;;
kb )
echo -e "kB\tpid\tname";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.kb|sort -rh;
;;
pid | * )
echo -e "pid\tkB\tname";
echo "========================================";
cat ${TMP}/${SCRIPT_NAME}.pid|sort -rh;
;;
esac
rm -fR "${TMP}/";
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