How To Find Open File Descriptors ( lsof , pfiles , ulimit )

I have come across the situation number of times when i need to find the open file descriptors for perticular process.

I have seen number of ppl confused about it ( including me in early days )

There are two command ppl generally uses.

1. lsof
2. pfiles

Both the command shows number of files opened not the file descriptors.

Here is example to prove it ,

root# /usr/local/bin/lsof -p 1281
COMMAND  PID   USER   FD   TYPE        DEVICE   SIZE/OFF    NODE NAME
oracle  1281 oracle  cwd   VDIR        85,101        512   29508 /volume1/export/home/oracle/app/product/10.2.0/db_1/dbs
oracle  1281 oracle  txt   VREG        85,101  111774824   52718 /volume1/export/home/oracle/app/product/10.2.0/db_1/bin/oracle
oracle  1281 oracle  txt   VREG         85,10       6904  157509 /platform/sun4u-us3/lib/sparcv9/libc_psr/libc_psr_hwcap1.so.1
oracle  1281 oracle  txt   VREG         85,10      78360  147322 /lib/sparcv9/libmd.so.1
oracle  1281 oracle  txt   VREG         85,10     789176  147147 /lib/sparcv9/libm.so.2
oracle  1281 oracle  txt   VREG         85,10      60872  147242 /lib/sparcv9/librt.so.1
oracle  1281 oracle  txt   VREG         85,10      55408  147208 /lib/sparcv9/libaio.so.1
oracle  1281 oracle  txt   VREG         85,10    1440632  147211 /lib/sparcv9/libc.so.1
oracle  1281 oracle  txt   VREG         85,10      11296  147221 /lib/sparcv9/libdl.so.1
oracle  1281 oracle  txt   VREG         85,10      55016  147225 /lib/sparcv9/libgen.so.1
oracle  1281 oracle  txt   VREG         85,10     111768  147249 /lib/sparcv9/libsocket.so.1
oracle  1281 oracle  txt   VREG         85,10    1045928  147234 /lib/sparcv9/libnsl.so.1
oracle  1281 oracle  txt   VREG         85,10      17320  147228 /lib/sparcv9/libkstat.so.1
oracle  1281 oracle  txt   VREG        85,101    6955360   23589 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libnnz10.so
oracle  1281 oracle  txt   VREG        85,101      85344   23444 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libdbcfg10.so
oracle  1281 oracle  txt   VREG        85,101    2588472   23476 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libclsra10.so
oracle  1281 oracle  txt   VREG        85,101   12573632   23518 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libjox10.so
oracle  1281 oracle  txt   VREG        85,101    2588776   23647 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libocrutl10.so
oracle  1281 oracle  txt   VREG        85,101    2961888   23452 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libocrb10.so
oracle  1281 oracle  txt   VREG        85,101    3008296   23557 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libocr10.so
oracle  1281 oracle  txt   VREG        85,101      11264   23607 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libskgxn2.so
oracle  1281 oracle  txt   VREG        85,101    3534504   23539 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libhasgen10.so
oracle  1281 oracle  txt   VREG        85,101     163128   23633 /volume1/export/home/oracle/app/product/10.2.0/db_1/lib/libskgxp10.so
oracle  1281 oracle  txt   VREG         85,10       2896   64408 /usr/lib/sparcv9/libsched.so.1
oracle  1281 oracle  txt   VREG         85,10     291632  147206 /lib/sparcv9/ld.so.1
oracle  1281 oracle    0u  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    1u  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    2u  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    3r  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    4r  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    5r  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    6r  VCHR          13,2            6815752 /devices/pseudo/mm@0:null
oracle  1281 oracle    7u  IPv4 0×3001e00c800        0t0     TCP *:* (IDLE)
oracle  1281 oracle    8r  VCHR         13,12            6815772 /devices/pseudo/mm@0:zero
oracle  1281 oracle    9r  DOOR                      0t0      54 /var/run/name_service_door (door to nscd[156]) (FA:->0×60002b9b780)
oracle  1281 oracle   10r  VREG        85,101     842240   60371 /volume1/export/home/oracle/app/product/10.2.0/db_1/rdbms/mesg/oraus.msb
oracle  1281 oracle   16u  IPv4 0×60014911000  0t1714671     TCP oaxgs36:1521->oaxgs36:60446 (ESTABLISHED)
oracle  1281 oracle  256u  VREG        85,105 1073750016    5864 /volume5/export/db1/oradata/xgs/dbf/undotbs01.dbf
oracle  1281 oracle  257u  VREG        85,105 8589942784    5867 /volume5/export/db1/oradata/xgs/dbf/stepsysdata_xgs_3.dbf

root# ls -l /proc/1281/fd/
total 18885312
c———   1 root     sys       13,  2 Sep  9 13:13 0
c———   1 root     sys       13,  2 Sep  9 13:13 1
-r–r–r–   1 oracle   oinstall  842240 Oct 30  2006 10
s———   0 root     root           0 Sep  7 17:45 16
c———   1 root     sys       13,  2 Sep  9 13:13 2
-rw-r—–   1 oracle   oinstall 1073750016 Sep  9 13:13 256
-rw-r—–   1 oracle   oinstall 8589942784 Sep  9 13:13 257
c———   1 root     sys       13,  2 Sep  9 13:13 3
c———   1 root     sys       13,  2 Sep  9 13:13 4
c———   1 root     sys       13,  2 Sep  9 13:13 5
c———   1 root     sys       13,  2 Sep  9 13:13 6
s———   0 root     root           0 May  3 09:39 7
c———   1 root     sys       13, 12 Mar 20 11:00 8
D———   1 root     root           0 Mar 20 10:59 9

So though process 1281 has opened number of file but it has only 14 file descriptors opened.

An easy way to iterate through each processes open file descriptors is to just run a simple shell loop, substituting your particular version of ps’s arguments, like:

host # for x in `ps -ef| awk ‘{ print $2 }’`;do ls /proc/$x/fd;done

If you’re only interested in the number of open file descriptors per process, you can shorten that output up even more:

host # for x in `ps -ef| awk ‘{ print $2 }’`;do ls /proc/$x/fd|wc -l;done

Check Shell Limits for Oracle Installation on Solaris ( SPARC )

Oracle has provided one script to check whether OS is meeting pre-requirements or not.Here is script.

========================================

TIMEOK=false
TIME=`/usr/bin/ulimit -t`
if /usr/bin/test -z “$TIME”
then
/usr/bin/echo TimeNotDef
elif [ $TIME != "unlimited" ]
then
/usr/bin/echo TimeTooSmall
else
TIMEOK=true
fi
FILEOK=false
FILE=`/usr/bin/ulimit -f`
if /usr/bin/test -z “$FILE”
then
/usr/bin/echo FileNotDefined
elif [ $FILE != "unlimited" ]
then
/usr/bin/echo FileTooSmall
else
FILEOK=true
fi
DATAOK=false
DATA=`/usr/bin/ulimit -d`
if /usr/bin/test -z “$DATA”

then
/usr/bin/echo DataNotDefined
elif [ $DATA = "unlimited" ]
then
DATAOK=true
elif [ $DATA -ge 1048576 ]
then
DATAOK=true
else
/usr/bin/echo DataTooSmall
fi
STACKOK=false
STACK=`/usr/bin/ulimit -s`
if /usr/bin/test -z “$STACK”
then
/usr/bin/echo StackNotDefined
elif [ $STACK = "unlimited" ]
then
STACKOK=true
elif [ $STACK -ge 32768 ]
then
STACKOK=true
else
/usr/bin/echo StackTooSmall
fi
NOFILESOK=false
NOFILES=`/usr/bin/ulimit -n`
if /usr/bin/test -z “$NOFILES”
then
/usr/bin/echo NoFilesNotDefined
elif [ $NOFILES = "unlimited" ]
then
NOFILESOK=true
elif [ $NOFILES -ge 4096 ]
then
NOFILESOK=true
else
/usr/bin/echo NoFilesTooSmall
fi
VMEMORYOK=false
VMEMORY=`/usr/bin/ulimit -v`
if /usr/bin/test -z “$VMEMORY”

then
/usr/bin/echo VmemoryNotDefined
elif [ $VMEMORY = "unlimited" ]
then
VMEMORYOK=true
elif [ $VMEMORY -ge 4194304 ]
then
VMEMORYOK=true
else
/usr/bin/echo VmemoryTooSmall
fi
if [ $TIMEOK = true  -a $FILEOK = true -a $DATAOK = true -a $STACKOK = true -a $NOFILESOK = true -a $VMEMORYOK = true ]
then
/usr/bin/echo ulimitOK
fi

====================================
For more scripts Note:334567.1