Centos5
PID的記憶體使用情況？
我試圖測量應用程序在目前時刻使用了多少記憶體。
所以我們開始吧，
free -k -t：[user@server ~]$ free -k -t total used free shared buffers cached Mem: 1026076 581880 444196 0 158656 269704 -/+ buffers/cache: 153520 872556 Swap: 0 0 0 Total: 1026076 581880 444196然後 pmap -x PID 想要驗證：
[user@server ~]$ pmap -x 18503 18503: /usr/bin/java -jar /home/user/app.jar mycfg.cfg Address Kbytes RSS Dirty Mode Mapping 0000000040000000 36 36 0 r-x-- java 0000000040108000 8 8 8 rwx-- java 00000000403d9000 4 0 0 ----- [ anon ] 00000000403da000 1024 12 12 rwx-- [ anon ] 000000004055b000 12 0 0 ----- [ anon ] 000000004055e000 1016 72 72 rwx-- [ anon ] 000000004065c000 12 0 0 ----- [ anon ] 000000004065f000 1016 72 72 rwx-- [ anon ] 00000000407ad000 12 0 0 ----- [ anon ] 00000000407b0000 1016 32 32 rwx-- [ anon ] 00000000408ae000 12 0 0 ----- [ anon ] 00000000408b1000 1016 36 36 rwx-- [ anon ] 00000000409cc000 12 0 0 ----- [ anon ] 00000000409cf000 1016 100 100 rwx-- [ anon ] 0000000040acd000 12 0 0 ----- [ anon ] 0000000040ad0000 1016 72 72 rwx-- [ anon ] 0000000040bce000 12 0 0 ----- [ anon ] 0000000040bd1000 1016 40 40 rwx-- [ anon ] 0000000040ccf000 12 0 0 ----- [ anon ] 0000000040cd2000 1016 36 36 rwx-- [ anon ] 0000000040e8a000 12 0 0 ----- [ anon ] 0000000040e8d000 1016 68 68 rwx-- [ anon ] 0000000040f8b000 12 0 0 ----- [ anon ] 0000000040f8e000 1016 68 68 rwx-- [ anon ] 00000000410dd000 12 0 0 ----- [ anon ] 00000000410e0000 1016 68 68 rwx-- [ anon ] 00000000411de000 12 0 0 ----- [ anon ] 00000000411e1000 1016 36 36 rwx-- [ anon ] 00000000412df000 12 0 0 ----- [ anon ] 00000000412e2000 1016 40 40 rwx-- [ anon ] 000000004144a000 12 0 0 ----- [ anon ] 000000004144d000 1016 8 8 rwx-- [ anon ] 000000004154b000 12 0 0 ----- [ anon ] 000000004154e000 1016 48 48 rwx-- [ anon ] 00000000416a7000 12 0 0 ----- [ anon ] 00000000416aa000 1016 36 36 rwx-- [ anon ] 00000000417a8000 12 0 0 ----- [ anon ] 00000000417ab000 1016 40 40 rwx-- [ anon ] 00000000418ec000 12 0 0 ----- [ anon ] 00000000418ef000 1016 40 40 rwx-- [ anon ] 00000000419ed000 12 0 0 ----- [ anon ] 00000000419f0000 1016 36 36 rwx-- [ anon ] 0000000041aee000 12 0 0 ----- [ anon ] 0000000041af1000 1016 40 40 rwx-- [ anon ] 0000000041c54000 12 0 0 ----- [ anon ] 0000000041c57000 1016 36 36 rwx-- [ anon ] 0000000041d55000 12 0 0 ----- [ anon ] 0000000041d58000 1016 8 8 rwx-- [ anon ] 0000000041e56000 4 0 0 ----- [ anon ] 0000000041e57000 1024 8 8 rwx-- [ anon ] 0000000041f57000 12 0 0 ----- [ anon ] 0000000041f5a000 1016 44 44 rwx-- [ anon ] 0000000042058000 12 0 0 ----- [ anon ] 000000004205b000 1016 68 68 rwx-- [ anon ] 0000000042159000 12 0 0 ----- [ anon ] 000000004215c000 1016 32 32 rwx-- [ anon ] 000000005e532000 10308 10272 10272 rwx-- [ anon ] 00000000eb200000 5312 5312 5312 rwx-- [ anon ] 00000000eb730000 80704 0 0 rwx-- [ anon ] 00000000f0600000 10752 5856 5856 rwx-- [ anon ] 00000000f1080000 161280 0 0 rwx-- [ anon ] 00000000fae00000 21248 11144 11144 rwx-- [ anon ] 00000000fc2c0000 62720 0 0 rwx-- [ anon ] 0000003ac7e00000 112 104 0 r-x-- ld-2.5.so 0000003ac801c000 4 4 4 r-x-- ld-2.5.so 0000003ac801d000 4 4 4 rwx-- ld-2.5.so 0000003ac8200000 1336 540 0 r-x-- libc-2.5.so 0000003ac834e000 2048 0 0 ----- libc-2.5.so 0000003ac854e000 16 16 8 r-x-- libc-2.5.so 0000003ac8552000 4 4 4 rwx-- libc-2.5.so 0000003ac8553000 20 20 20 rwx-- [ anon ] 0000003ac8600000 8 8 0 r-x-- libdl-2.5.so 0000003ac8602000 2048 0 0 ----- libdl-2.5.so 0000003ac8802000 4 4 4 r-x-- libdl-2.5.so 0000003ac8803000 4 4 4 rwx-- libdl-2.5.so 0000003ac8a00000 88 64 0 r-x-- libpthread-2.5.so 0000003ac8a16000 2044 0 0 ----- libpthread-2.5.so 0000003ac8c15000 4 4 4 r-x-- libpthread-2.5.so 0000003ac8c16000 4 4 4 rwx-- libpthread-2.5.so 0000003ac8c17000 16 4 4 rwx-- [ anon ] 0000003ac8e00000 520 20 0 r-x-- libm-2.5.so 0000003ac8e82000 2044 0 0 ----- libm-2.5.so 0000003ac9081000 4 4 4 r-x-- libm-2.5.so 0000003ac9082000 4 4 4 rwx-- libm-2.5.so 0000003ac9e00000 28 20 0 r-x-- librt-2.5.so 0000003ac9e07000 2048 0 0 ----- librt-2.5.so 0000003aca007000 4 4 4 r-x-- librt-2.5.so 0000003aca008000 4 4 4 rwx-- librt-2.5.so 0000003acc600000 84 24 0 r-x-- libnsl-2.5.so 0000003acc615000 2044 0 0 ----- libnsl-2.5.so 0000003acc814000 4 4 4 r-x-- libnsl-2.5.so 0000003acc815000 4 4 4 rwx-- libnsl-2.5.so 0000003acc816000 8 0 0 rwx-- [ anon ] 0000003acce00000 68 52 0 r-x-- libresolv-2.5.so 0000003acce11000 2048 0 0 ----- libresolv-2.5.so 0000003acd011000 4 4 4 r-x-- libresolv-2.5.so 0000003acd012000 4 4 4 rwx-- libresolv-2.5.so 0000003acd013000 8 4 0 rwx-- [ anon ] 00002aaaaaaab000 8 8 0 r-xs- gcb.jar 00002aaaaaaad000 32 32 0 r-xs- resources.jar 00002aaaaaaba000 52 52 0 r-x-- libverify.so 00002aaaaaac7000 1020 0 0 ----- libverify.so 00002aaaaabc6000 12 12 12 rwx-- libverify.so 00002aaaaabc9000 164 132 0 r-x-- libjava.so 00002aaaaabf2000 1020 0 0 ----- libjava.so 00002aaaaacf1000 28 20 20 rwx-- libjava.so 00002aaaaacf8000 4 4 0 r-x-- [ anon ] 00002aaaaacf9000 4 4 4 rwx-- [ anon ] 00002aaaaacfa000 32 32 12 rwxs- 18503 00002aaaaad08000 40 24 0 r-x-- libnss_files-2.5.so 00002aaaaad12000 2044 0 0 ----- libnss_files-2.5.so 00002aaaaaf11000 4 4 4 r-x-- libnss_files-2.5.so 00002aaaaaf12000 4 4 4 rwx-- libnss_files-2.5.so 00002aaaaaf13000 56 56 0 r-x-- libzip.so 00002aaaaaf21000 1032 0 0 ----- libzip.so 00002aaaab023000 12 12 12 rwx-- libzip.so 00002aaaab026000 2500 1168 1168 rwx-- [ anon ] 00002aaaab297000 46656 0 0 rwx-- [ anon ] 00002aaaae027000 40 40 40 rwx-- [ anon ] 00002aaaae031000 728 0 0 rwx-- [ anon ] 00002aaaae0e7000 12 12 12 rwx-- [ anon ] 00002aaaae0ea000 156 0 0 rwx-- [ anon ] 00002aaaae111000 24 24 24 rwx-- [ anon ] 00002aaaae117000 312 0 0 rwx-- [ anon ] 00002aaaae165000 44 44 44 rwx-- [ anon ] 00002aaaae170000 120 0 0 rwx-- [ anon ] 00002aaaae18e000 28 16 16 rwx-- [ anon ] 00002aaaae195000 316 0 0 rwx-- [ anon ] 00002aaaae1e4000 44 24 24 rwx-- [ anon ] 00002aaaae1ef000 124 0 0 rwx-- [ anon ] 00002aaaae20e000 1632 1632 0 r-xs- rt.jar 00002aaaae3a6000 208 208 208 rwx-- [ anon ] 00002aaaae3da000 55144 44 0 r-x-- locale-archive 00002aaab19b4000 160 160 0 r-xs- bcprov-jdk15-146.jar 00002aaab19dc000 28 28 0 r-xs- mysql-connector-java-5.1.13-bin.jar 00002aaab19e3000 24 24 0 r-xs- commons-configuration-1.6.jar 00002aaab19e9000 20 20 0 r-xs- commons-lang-2.5.jar 00002aaab19ee000 8 8 0 r-xs- commons-logging-1.1.1.jar 00002aaab19f0000 56 56 0 r-xs- commons-collections-3.2.1.jar 00002aaab19fe000 12 12 0 r-xs- jce.jar 00002aaab1a01000 24 24 0 r-xs- jsse.jar 00002aaab1a07000 12 12 0 r-xs- sunjce_provider.jar 00002aaab1a0a000 76 72 0 r-x-- libnet.so 00002aaab1a1d000 1028 0 0 ----- libnet.so 00002aaab1b1e000 12 12 12 rwx-- libnet.so 00002aaab1b2f000 16 16 0 r-x-- libnss_dns-2.5.so 00002aaab1b33000 2044 0 0 ----- libnss_dns-2.5.so 00002aaab1d32000 4 4 4 r-x-- libnss_dns-2.5.so 00002aaab1d33000 4 4 4 rwx-- libnss_dns-2.5.so 00002aaab4000000 16432 3272 3272 rwx-- [ anon ] 00002aaab500c000 49104 0 0 ----- [ anon ] 00002b29fc3a7000 8 8 8 rwx-- [ anon ] 00002b29fc3b7000 28 16 0 r-x-- libjli.so 00002b29fc3be000 1028 0 0 ----- libjli.so 00002b29fc4bf000 8 8 8 rwx-- libjli.so 00002b29fc4c1000 12 12 12 rwx-- [ anon ] 00002b29fc4c4000 9320 6500 0 r-x-- libjvm.so 00002b29fcdde000 1032 0 0 ----- libjvm.so 00002b29fcee0000 1748 608 608 rwx-- libjvm.so 00002b29fd095000 232 164 164 rwx-- [ anon ] 00007fff13b03000 84 44 44 rwx-- [ stack ] 00007fff13b34000 16 4 0 r-x-- [ anon ] ffffffffff600000 8192 0 0 ----- [ anon ] ---------------- ------ ------ ------ total kB 601248 49456 39620是檢查它的好方法嗎？
在我的 1026076 (1GB) 可用記憶體中，該程序真的使用 600K 嗎？
我計算對了嗎？
這是一個虛擬機伺服器，以防萬一如果您需要我輸出任何其他命令，請告訴我，謝謝。
我假設您是根據
pmap輸出的這一行得出的結論：total kB 601248 49456 39620如果是這樣，你讀錯了。這些數字是正在使用的千字節總數，而不是bytes，因此您的 JVM 已請求大約 600 MB記憶體，其中 49 MB實際上儲存在物理記憶體中（其餘的被換出，或已送出但未使用，管他呢）。一小部分記憶體可能與其他程序共享（例如，mmap’d 庫），但與您的程序使用情況相比，它是噪音。