Memory Usage 확인용 스크립트
출처 : https://fritshoogland.wordpress.com/2017/07/25/linux-memory-usage/
유용한 스크립트라 퍼 옵니다.
아래의 공식으로 Total을 계산합니다.
MemFree
+ KernelStack
+ Buffers
+ PageTables
+ AnonPages
+ Slab
+ SwapCached
+ Cached – Shmem
+ Shmem
+ HugePages used (HugePages_Total-Hugepages_Free)*Hugepagesize
+ Hugepages rsvd (Hugepages_Rsvd*Hugepagesize)
+ Hugepages free (Hugepages_Free-Hugepages_Rsvd)*Hugepagesize
————————————————————-
= Approximate total memory usage
현재 정보 확인용으로 사용시
testora.localdomain> sh memstat.sh --oneshot Free 519056 Shmem 732916 Mapped+Cached 171364 Anon 1180032 Pagetables 95848 KernelStack 7376 Buffers 111172 Slab 126284 SwpCache 24800 HP Used 0 HP Rsvd 0 HP Free 0 Unknown 45472 ( 1%) Total memory 3014320 --------------------------- Total swp 4194300 Used swp 1575956 ( 37%)
아래는 모니터링시 메모리 사용양에 대해 관제용으로 사용하면 될 거 같습니다.
testora.localdomain> sh memstat.sh
Free Shmem Mapped+Cached Anon Pagetables KernelStack Buffers Slab SwpCache HP Used HP Rsvd HP Free Unknown %
518800 732916 171316 1179888 95848 7376 111084 126520 24800 0 0 0 45772 1
518092 732916 171308 1179720 95964 7408 111092 126580 24800 0 0 0 46440 1
518356 732916 171316 1180088 95964 7408 111092 126596 24800 0 0 0 45784 1
510876 732916 171316 1185444 97928 7440 111100 126576 24800 0 0 0 45924 1
510852 732916 171316 1185808 97928 7440 111100 126584 24800 0 0 0 45576 1
510664 732916 171316 1185664 97932 7440 111100 126616 24800 0 0 0 45872 1
510308 732916 171316 1185792 97924 7440 111108 126656 24800 0 0 0 46060 1
502696 732916 171320 1190992 100208 7456 111108 126812 24800 0 0 0 46012 1
502828 732916 171320 1190776 100204 7456 111108 126804 24800 0 0 0 46108 1
502672 732916 171320 1191140 100208 7456 111112 126856 24800 0 0 0 45840 1
502796 732916 171320 1190776 100212 7456 111112 126904 24800 0 0 0 46028 1
502712 732916 171320 1191124 100204 7456 111116 126820 24800 0 0 0 45852 1
502604 732916 171320 1190992 100204 7456 111116 126772 24800 0 0 0 46140 1
^C
memstat.sh 내용입니다.
#!/bin/bash
#set -x
[ "$1" = '--oneshot' ] && ONESHOT="yes" || ONESHOT="no"
PAGESIZE=30
SLEEP_TIME=3
[ $ONESHOT = "no" ] && printf " Free Shmem Mapped+Cached Anon Pagetables KernelStack Buffers Slab SwpCache HP Used HP Rsvd HP Free Unknown %%\n"
ROWCOUNTER=0
while ( true ); do
# 1 get meminfo
MEMINFO=$( cat /proc/meminfo )
# 2 get relevant data
MEMTOTAL=$( echo "$MEMINFO" | awk '/^MemTotal/ { print $2 }')
MEMFREE=$( echo "$MEMINFO" | awk '/^MemFree/ { print $2 }')
KERNELSTACK=$( echo "$MEMINFO" | awk '/^KernelStack/ { print $2 }')
BUFFERS=$( echo "$MEMINFO" | awk '/^Buffers/ { print $2 }')
CACHED=$( echo "$MEMINFO" | awk '/^Cached/ { print $2 }')
PAGETABLES=$( echo "$MEMINFO" | awk '/^PageTables/ { print $2 }')
SHMEM=$( echo "$MEMINFO" | awk '/^Shmem/ { print $2 }')
ANONPAGES=$( echo "$MEMINFO" | awk '/^AnonPages/ { print $2 }')
SLAB=$( echo "$MEMINFO" | awk '/^Slab/ { print $2 }')
SWAPCACHED=$( echo "$MEMINFO" | awk '/^SwapCached/ { print $2 }')
# hugepages are expressed in pages, not KB
HP_TOTAL=$( echo "$MEMINFO" | awk '/^HugePages_Total/ { print $2 }')
HP_RSVD=$( echo "$MEMINFO" | awk '/^HugePages_Rsvd/ { print $2 }')
HP_FREE=$( echo "$MEMINFO" | awk '/^HugePages_Free/ { print $2 }')
HP_SIZE=$( echo "$MEMINFO" | awk '/^Hugepagesize/ { print $2 }')
# swap
SWAP_TOTAL=$( echo "$MEMINFO" | awk '/^SwapTotal/ { print $2 }')
SWAP_FREE=$( echo "$MEMINFO" | awk '/^SwapFree/ { print $2 }')
# 3 define final data
# MEMTOTAL
# MEMFREE
# KERNELSTACK
# BUFFERS
CACHED=$(( $CACHED-$SHMEM ))
# PAGETABLES
# SHMEM
# ANONPAGES
# SLAB
# SWAPCACHED
HP_USED_KB=$(( ($HP_TOTAL-$HP_FREE)*$HP_SIZE ))
HP_RSVD_KB=$(( $HP_RSVD*$HP_SIZE ))
HP_REALFREE_KB=$(( ($HP_FREE-$HP_RSVD)*$HP_SIZE ))
SWAP_USED=$(( $SWAP_TOTAL-$SWAP_FREE ))
SWAP_PCT=$(( ($SWAP_USED*100)/$SWAP_TOTAL ))
#
ACCT_FOR_MEM_TOTAL=$(( $MEMFREE+$KERNELSTACK+$BUFFERS+$CACHED+$PAGETABLES+$SHMEM+$MAPPED+$ANONPAGES+$SLAB+$SWAPCACHED+$HP_USED_KB+$HP_RSVD_KB+$HP_REALFREE_KB ))
UNACCT_FOR=$(( $MEMTOTAL-$ACCT_FOR_MEM_TOTAL ))
UA_PCT=$(( ($UNACCT_FOR*100)/$MEMTOTAL ))
if [ $ONESHOT = "no" ]; then
# visualize
printf "%14d %14d %14d %14d %14d %14d %14d %14d %14d %14d %14d %14d %14d %3d\n" $MEMFREE $SHMEM $CACHED $ANONPAGES $PAGETABLES $KERNELSTACK $BUFFERS $SLAB $SWAPCACHED $HP_USED_KB $HP_RSVD_KB $HP_REALFREE_KB $UNACCT_FOR $UA_PCT
sleep $SLEEP_TIME
let ROWCOUNTER++
if (( $ROWCOUNTER % $PAGESIZE == 0 )); then
printf " Free Shmem Mapped+Cached Anon Pagetables KernelStack Buffers Slab SwpCache HP Used HP Rsvd HP Free Unknown %%\n"
fi
fi
if [ $ONESHOT = "yes" ]; then
printf "Free %14d\nShmem %14d\nMapped+Cached%14d\nAnon %14d\nPagetables %14d\nKernelStack %14d\nBuffers %14d\nSlab %14d\nSwpCache %14d\nHP Used %14d\nHP Rsvd %14d\nHP Free %14d\nUnknown %14d (%3d%%)\nTotal memory %14d\n---------------------------\nTotal swp %14d\nUsed swp %14d (%3d%%)\n" $MEMFREE $SHMEM $CACHED $ANONPAGES $PAGETABLES $KERNELSTACK $BUFFERS $SLAB $SWAPCACHED $HP_USED_KB $HP_RSVD_KB $HP_REALFREE_KB $UNACCT_FOR $UA_PCT $MEMTOTAL $SWAP_TOTAL $SWAP_USED $SWAP_PCT
break
fi
done
mem.sh: line 35: 7584392-5455264
0
0 : syntax error in expression (error token is "0
0 ")