Script Application 16: Monitor and consume memory resources

role: monitoring or consuming memory resources, specifying the percentage that needs to be consumed

implementation: by writing a file of a certain size in memory

Demonstrate:

Direct enter to view the current percentage of memory

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Enter the percentage of memory you want to consume

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Code area:

#/bin/bash #  ly#  ------------------#  copyright 2014.11.25  lingyi  ([email protected])  qq:1519952564get_file_num () {big_num=$1small_num=$2num=$3file_num_ perc=$ ( echo  "${big_num}-${small_num}"  | bc ) file_num_moment=$ ( echo  "$ (   echo  "0$ (echo " scale=2; ${file_num_perc}/100 "&NBSP;|&NBSP;BC)"  ) *${num} "  | bc ) file_num_one=$ ( echo ${file_num_moment} | awk -F.  ' {print $ 1} '   ' file_num_two=$ ( echo ${file_num_moment} | awk -F.  ' {print $2} '  ) [[ ${file_num_two:0:1} -eq 0 ]] && file_num_two=${file_num_two : 1:1}[[ ${file_num_two} -ge 50 ]] && let file_num_one++echo ${ File_num_one}}clean_up () {&NBSP;UMOUNT&NBSP;${MEMORY_DIR}&NBSP;&AMP;&AMP;&NBSP;RM&NBSP;-FR&NBSP;${MEMORY_DIR}RM  -fr .test_memory_file_sum.file}if [[ ! -f /usr/bin/bc ]]; then echo  "Try to  install bc tool ...  "yum install -y bc >/dev/null 2> &1if [[ $? -ne 0 ]]; thenecho -e  "\033[1;31mtool: \" bc\ "  install failed !! \033[0m "exit 1fifitrap  ' clean_up &>/dev/null; tput cnorm; echo -e   "\033[0m";  exit 0 '  2echo -e  "\033[1;32minput the percentage that  you want, if empty then only monitor. " echo -e  "\033[1;32m\" ctrl + c\ " to exit." echo -ne  "\033[1;34minput the percentage[ " echo -ne  "\033[1;31meg:50 " echo -ne  "\033[1;34m]: " read keep_busy_percif [[  $keep _busy_perc ==  "q " ]] | |  [[  $keep _busy_perc ==  "Q" &nbSP;]];  then exit 0; fimemory_dir= ". memory.$ (date +"%y%m%d%h%m%s ")" mkdir -p ${ memory_dir}if [[ $? -ne 0 ]]; then echo  "Create memory test  dir failed !! ";  exit 1; fimemory_sum=$ (  free -m | awk  ' {print $2} ' |sed  -n  ' 2p '  ) mount -t tmpfs -o size=${memory_sum}m tmpfs ${memory_ dir}tput civiswhile :; domemory_used=$ (  free -m | awk  ' {print  $3} '  | sed -n  ' 2p '   memory_free=$ ( echo  "${memory_sum}-${memory_used} " | bc " memory_busy_perc=$ ( echo  "scale=2; $ ( echo " scale=4; ${ memory_used}/${memory_sum}*100 "&NBSP;|&NBSP;BC)/1"  | bc ) tput cup 00; tput  edecho -e  "\033[1;32mmemory sum :\033[1;34m$ (printf "%-8s " "  ${mEmory_sum} ") \033[1;32mm" echo -e  "\033[1;32mmemory used:\033[1;35m$ (printf "%-8s " "  ${memory_used} ") \033[1;32mm" echo -e  "\033[1;32mmemory free:\033[1;36m$ (printf "%-8s "   " ${memory_free}") \033[1;32mm "echo -e " \033[1;32mmemory perc:\033[1;31m$ (printf   "%-8s"   " ${memory_busy_perc}") \033[1;32m% "echo -ne " \033[0m "one=$ ( echo ${ memory_busy_perc} | awk -f.  ' {print $1} ') two=$ ( echo ${memory_busy_perc}  | awk -F.  ' {print $2} ') [[ ${two:0:1} -eq 0 ]] &&  two=${two:1:1}[[ ${two} -ge 50 ]] && let one++if [[  -z $ ( ls ${memory_dir} )  ]]; then      if  [[ ${keep_busy_perc} -gt ${one} ]]; thenecho -ne  "\033[1; 31minitializating ...\033[0m "file_sum=$( get_file_num ${keep_busy_perc} ${one} ${memory_sum} ) echo ${file_sum}  >.test_memory_file_sum.filefor  ((i=1; i<=file_sum; i++));  dodd if=/dev/zero  of=${memory_dir}/${i} bs=1m count=1 &done >/dev/null 2>&1wait       fielseif [[ ${keep_busy_perc} -gt ${one} ]];  thenfile_num=$ ( get_file_num ${keep_busy_perc} ${one} ${memory_sum} ) file_sum=$ (echo  "' Cat .test_memory_file_sum.file ' +${file_num}" &NBSP;|&NBSP;BC) Echo ${file_sum} >. test_memory_file_sum.filefor  ((i=file_num+1; i<=${file_sum}; i++));  dodd if=/dev/ zero of=${memory_dir}/${i} bs=1m count=1 &done >/dev/null 2>& 1waitfiif [[ ${keep_busy_perc} -lt ${one} ]]; thenfile_num=$ ( get_file_num  ${one} ${keep_busy_perc} ${memory_sum} ) if [[ ${file_num} -gt $ (cat .test_memory_file_sum.file)  ]]; thenrm -fr ${memory_dir}/*elsefor  ((i=0; i<file_num; i++));  Dothe_file_name= ' echo  "$ (cat .test_memory_file_sum.file)-${i}" &NBSP;|&NBSP;BC "rm -fr ${ Memory_dir}/${the_file_name}donefififisleep 1done

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Script Application 16: Monitor and consume memory resources