How can i find memory leak in Solaris? Post: 302947750

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Operating Systems Solaris How can i find memory leak in Solaris? Post 302947750 by bentech4u on Sunday 21st of June 2015 03:15:29 PM

06-21-2015

Registered User

Quote:

Originally Posted by Don Cragun

From everything that you have shown us, you are now happy that access to ZFS filesystems will be slower than they were before. Before you limited ZFS's use of free memory, it was using lots of free memory as a disk cache. Now, you have lots of free memory that is free, but can't be used by ZFS.

Before you made this change and when the databases were running, you had less free memory. Why is that a problem? Was it causing a lot of swapping?

Why buy 64GB of memory if your goal is to keep 49GB free (i.e., unused)?

this machine has only 2 zones, application and database. when the memory issue was there, application pages was not loading and they were keep on complaining about the system. and team used to reboot full server every week to resolve this issue.

i am not sure about issue faced before this settings. only thing from mbd i can see like 45 GB memory was used by zfs cache.

---------- Post updated at 02:15 PM ---------- Previous update was at 02:09 PM ----------

Quote:

Originally Posted by Don Cragun

If Oracle is unable to allocate 32 bytes, the problem is likely to be that the "oracle database thread size was set to 4 Gb"; not that the ZFS buffer cache size has been restricted.

What was mdb showing when Oracle failed?

this is current mdb status

Code:

root@hrms-zones #echo "::memstat" | mdb "-kw"
Page Summary                Pages                MB  %Tot
------------     ----------------  ----------------  ----
Kernel                     360511              2816    4%
ZFS File Data              457370              3573    6%
Anon                       132190              1032    2%
Exec and libs                7571                59    0%
Page cache                  27998               218    0%
Free (cachelist)            70049               547    1%
Free (freelist)           7152269             55877   87%

Total                     8207958             64124
Physical                  8190943             63991

Yes oracle database thread size was set to 4 Gb and they want to increase that. while trying to increase thread size only they are getting error

bentech4u

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LEARN ABOUT FREEBSD

zfsloader

ZFSLOADER(8)						    BSD System Manager's Manual 					      ZFSLOADER(8)

NAME

     zfsloader -- kernel bootstrapping final stage

DESCRIPTION

     zfsloader is an extended variant of loader(8) with added support for booting from ZFS.  This document describes only differences from
     loader(8).

ZFS FEATURES

     zfsloader supports the following format for specifying ZFS filesystems which can be used wherever loader(8) refers to a device specification:

     zfs:pool/filesystem:

     where pool/filesystem is a ZFS filesystem name as described in zfs(8).

     If /etc/fstab does not have an entry for the root filesystem and vfs.root.mountfrom is not set, but currdev refers to a ZFS filesystem, then
     zfsloader will instruct kernel to use that filesystem as the root filesystem.

ZFS COMMAND EXTENSIONS

     lsdev [-v]
	     Lists ZFS pools in addition to disks and partitions.  Adding -v shows more ZFS pool details in a format that resembles zpool status
	     output.

     lszfs filesystem
	     A ZFS extended command that can be used to explore the ZFS filesystem hierarchy in a pool.  Lists the immediate children of the
	     filesystem.  The filesystem hierarchy is rooted at a filesystem with the same name as the pool.

FILES

     /boot/zfsloader  zfsloader itself.

EXAMPLES

     Set the default device used for loading a kernel from a ZFS filesystem:

	   set currdev=zfs:tank/ROOT/knowngood:

SEE ALSO

     gptzfsboot(8), loader(8), zfs(8), zfsboot(8), zfsloader(8), zpool(8)

HISTORY

     The zfsloader first appeared in FreeBSD 7.3.

AUTHORS

     This manual page was written by Andriy Gapon <avg@FreeBSD.org>.

BSD
								September 15, 2014							       BSD