H 2010/3/4 Yong Huang <yong321@xxxxxxxxx> > > I?m looking for a memory problem on a system using the pmap command. > > > > This is an output: > > # pmap -d 4302 > > # > ..... > > 49770000 128896 rwx-- 0000000049770000 000:00000 [ anon ] > > 51550000 1398144 rwx-- 0000000051550000 000:00000 [ anon ] > > a6ab0000 172288 rwx-- 00000000a6ab0000 000:00000 [ anon ] > > b4612000 8636 r-xs- 0000000000000000 068:00002 charsets.jar > ..... > > mapped: 2391764K writeable/private: 2217000K shared: 158336K > > > > I have a lot of used memory and the line that takes my attention is this: > > 51550000 1398144 rwx-- 0000000051550000 000:00000 [ anon ] > > > > But now I don?t know how to handle it. What can I do with this info? how > can > > I know why there is so much memory there? > > > > Thanks in advance > > > > ESG > > It's always a good idea to tell us your Red Hat and kernel version. On any > slightly newer version, you can see more details about any memory segment > in smaps pseudo file under /proc/<pid>. Your 1.4 GB anonymous memory is > allocated private to that process. Some programs are written in a way to use > lots of memory for data processing. Other than asking the developer to > change the code, there's not much you can do. If they can't do it and you > have multiple such processes running at the same time, ask the developer to > see if they can rewrite to use shared memory, or at least a large portion of > it as shared. > > If the memory keeps growing and never comes down, that's another issue. > Tell the developer he must fix the memory leak. > > Yong Huang > > Hi, the kernel I have is this: Linux server 2.6.9-42.0.10.ELsmp #1 SMP Fri Feb 16 17:17:21 EST 2007 i686 i386 GNU/Linux The version of Red hat is: more redhat-release Red Hat Enterprise Linux AS release 4 (Nahant Update 4) I have run the comando pmap -d 4302 again and here is the output: .... 414fa000 336 rwx-- 00000000414fa000 000:00000 [ anon ] 4154e000 4 rwx-- 000000004154e000 000:00000 [ anon ] 4154f000 145284 rwx-- 000000004154f000 000:00000 [ anon ] 4a330000 116864 rwx-- 000000004a330000 000:00000 [ anon ] 51550000 1398144 rwx-- 0000000051550000 000:00000 [ anon ] a6ab0000 172224 rwx-- 00000000a6ab0000 000:00000 [ anon ] b12e0000 2496 rwx-- 00000000b12e0000 000:00000 [ anon ] b1550000 4 r-x-- 0000000000000000 068:00002 librmi.so b1551000 4 rwx-- 0000000000000000 068:00002 librmi.so b1552000 764 rwx-- 00000000b1552000 000:00000 [ anon ] b1611000 4 rwx-- 00000000b1611000 000:00000 [ anon ] b1612000 48704 rwx-- 00000000b1612000 000:00000 [ anon ] b45a2000 448 rwx-- 00000000b45a2000 000:00000 [ anon ] b4612000 8636 r-xs- 0000000000000000 068:00002 charsets.jar b4e81000 84 r-xs- 0000000000000000 068:00002 jce.jar b4e96000 532 r-xs- 0000000000000000 068:00002 jsse.jar .... mapped: 2690360K writeable/private: 2578232K shared: 94876K the line I thought it was a problem hasn´t increased at all but the total memory has increased a lot. I have a lot of lines like this: 3a136000 12 --x-- 000000003a136000 000:00000 [ anon ] 3a139000 504 rwx-- 000000003a139000 000:00000 [ anon ] 3a1b7000 12 --x-- 000000003a1b7000 000:00000 [ anon ] 3a1ba000 504 rwx-- 000000003a1ba000 000:00000 [ anon ] 3a238000 12 --x-- 000000003a238000 000:00000 [ anon ] 3a23b000 504 rwx-- 000000003a23b000 000:00000 [ anon ] 3a2b9000 12 rwx-- 000000003a2b9000 000:00000 [ anon ] 3a2bc000 504 rwx-- 000000003a2bc000 000:00000 [ anon ] 3a33a000 12 rwx-- 000000003a33a000 000:00000 [ anon ] 3a33d000 504 rwx-- 000000003a33d000 000:00000 [ anon ] 3a3bb000 12 --x-- 000000003a3bb000 000:00000 [ anon ] 3a3be000 504 rwx-- 000000003a3be000 000:00000 [ anon ] 3a43c000 12 --x-- 000000003a43c000 000:00000 [ anon ] Looking at the file: /proc/4302/maps I don´t see anything that gives me any idea. How can I detect the memory leak looking at this? How can I know where is the memory? Thanks, ESG -- redhat-list mailing list unsubscribe mailto:redhat-list-request@xxxxxxxxxx?subject=unsubscribe https://www.redhat.com/mailman/listinfo/redhat-list
