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最後更新: 2015-03-04
目錄
說明
- Vss = virtual set size <--- Process 宣告用幾多 ram
- Rss = resident set size <--- 實際用幾多 ram (包含 library) [Unit: kbyte]
- Pss = proportional set size <--- library 平分後的 ram 用量
- Uss = unique set size
Unshared memory is reported as the USS (Unique Set Size).
The unshared memory (USS) plus a process's proportion of shared memory is reported as the PSS (Proportional Set Size).
The USS and PSS only include physical memory usage.
(They do not include memory that has been swapped out to disk. )
smem - Report memory usage
pull most of the data it needs from the /proc
Depends: python
opts:
# This lets smem detect the amount of memory
-R REALMEM # Example: -R 1024M
usage by X
- -m, --mappings
- -u, --users
- -w, --system
FILTER BY
-P PROCESSFILTER
Show
- -t # Show totals
- -P regex # Process filter regular expression
- -k # Show unit suffixes
- -n, --numeric # Show numeric user IDs instead of usernames.
- -s SORT, --sort=SORT # Field to sort on.
- -r, --reverse # Reverse sort.
FILES
- /proc/$pid/cmdline
- /proc/$pid/smaps
- /proc/$pid/stat
- /proc/meminfo
- /proc/version
Example
smem
PID User Command Swap USS PSS RSS 300 root /usr/sbin/courierlogger -pi 84 4 13 384 2917 root /sbin/getty 38400 console 76 4 14 456 2918 root /sbin/getty 38400 tty1 72 4 14 456 2919 root /sbin/getty 38400 tty2 72 4 14 456 2920 root /sbin/getty 38400 tty3 72 4 14 456 2921 root /sbin/getty 38400 tty4 72 4 14 456 ............
# Filter by proccess name
smem -t -k -P [a]pache2
PID User Command Swap USS PSS RSS 19705 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19706 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19707 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19708 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19709 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19710 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19711 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19712 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19713 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19714 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19715 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19716 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19717 root /usr/sbin/apache2 -k start 0 124.0K 356.0K 6.5M 19718 root /usr/sbin/apache2 -k start 0 124.0K 357.0K 6.5M 19719 root /usr/sbin/apache2 -k start 0 124.0K 357.0K 6.5M 19704 root /usr/sbin/apache2 -k start 0 128.0K 361.0K 6.5M 19735 root /usr/sbin/apache2 -k start 0 124.0K 361.0K 6.5M 19701 root /usr/sbin/apache2 -k start 0 232.0K 582.0K 7.2M 19702 root /usr/sbin/apache2 -k start 0 232.0K 582.0K 7.2M 19693 root /usr/sbin/apache2 -k start 0 992.0K 1.1M 4.0M 19700 root /usr/sbin/apache2 -k start 0 2.1M 3.2M 11.0M 19688 root /usr/sbin/apache2 -k start 0 4.8M 6.0M 14.4M 19703 root /usr/sbin/apache2 -k start 0 6.3M 7.2M 14.4M ------------------------------------------------------------------------------- 63 1 0 16.6M 24.6M 169.2M
# sort by swap & show pid
smem -s swap -t -k -n
-n, --numeric # Show numeric user IDs instead of usernames.
-s SORT, --sort=SORT # Field to sort on.
# User 用幾多 memory
smem -u -k
-u, --users # Report memory usage by user.
User Count Swap USS PSS RSS dovecot 1 144.0K 4.0K 4.0K 16.0K nobody 1 188.0K 4.0K 4.0K 16.0K policyd 1 588.0K 4.0K 4.0K 16.0K rpcuser 1 404.0K 4.0K 4.0K 16.0K opendkim 1 784.0K 28.0K 29.0K 68.0K rpc 1 168.0K 72.0K 72.0K 100.0K iredadmin 1 5.0M 40.0K 205.0K 1.6M iredapd 1 2.1M 252.0K 281.0K 516.0K amavis 3 166.2M 592.0K 633.0K 804.0K vmail 4 1.4M 812.0K 1.3M 3.6M postfix 3 1.1M 1.5M 1.9M 3.0M apache 6 22.9M 3.9M 5.0M 13.6M mysql 1 11.4M 9.5M 9.5M 9.8M root 33 19.5M 16.1M 17.4M 24.6M clamav 2 196.6M 80.0M 80.1M 80.8M
pmap
pmap - report memory map of a process
usage:
pmap 6703
ps aux
VSZ virtual memory size of the process in KiB (1024-byte units)
RSS resident set size, the non-swapped physical memory that a task has used
(RSS 是包括共享存的"/lib/i386-linux-gnu/libpthread-2.15.so")
pmap -d 6703
-d device Show the device format.
................ mapped: 6008K writeable/private: 936K shared: 4K
writeable/private 才是真正用 RAM 數
RSS: 保留內存的字節數（KB）
Dirty: 髒頁的字節數（包括共享和私有的）（KB）
Mode: read, write, execute, shared, private (寫時複製)
Mapping:
filename: 佔用內存的文件
[anon]（分配的內存）
[stack]（堆棧）
Offset: 文件偏移
Device: major:minor
memstat
pidof proccess_name // Get pid
memstat -p <pid>
e.g.
668k: PID 6702 (/usr/sbin/nginx)
4k( 4k): [00:04]:697812347 6702
600k( 560k): /usr/sbin/nginx 6702
136k( 128k): /lib/ld-linux.so.2 6702
1692k( 1676k): [fc:04]:131200 6702
40k( 32k): [fc:04]:131203 6702
1696k( 1608k): [fc:04]:131204 6702
20k( 12k): [fc:04]:131206 6702
96k( 88k): [fc:04]:131221 6702
36k( 28k): [fc:04]:131222 6702
52k( 44k): [fc:04]:131224 6702
48k( 40k): [fc:04]:131226 6702
240k( 232k): [fc:04]:131232 6702
100k( 92k): [fc:04]:131235 6702
344k( 316k): [fc:04]:131242 6702
88k( 80k): [fc:04]:131250 6702
--------
5860k ( 4940k)
668k: PID 6702 (/usr/sbin/nginx)
amount of memory(does not include shared memory, text-segment is also not included), process ID, executable name
4k( 4k): [00:04]:697812347 6702
600k( 560k): /usr/sbin/nginx 6702
136k( 128k): /lib/ld-linux.so.2 6702
1692k( 1676k): [fc:04]:131200 6702
40k( 32k): [fc:04]:131203 6702
1696k( 1608k): [fc:04]:131204 6702
20k( 12k): [fc:04]:131206 6702
96k( 88k): [fc:04]:131221 6702
36k( 28k): [fc:04]:131222 6702
52k( 44k): [fc:04]:131224 6702
48k( 40k): [fc:04]:131226 6702
240k( 232k): [fc:04]:131232 6702
100k( 92k): [fc:04]:131235 6702
344k( 316k): [fc:04]:131242 6702
88k( 80k): [fc:04]:131250 6702
total amount of memory allocated ( amount that is really shared is listed )
