tag:blogger.com,1999:blog-89030625731095780362012-02-17T01:59:15.901+01:00I love DTrace. But don't tell that to my wife because she would be jealous of another love in my life ... ;-)Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.comBlogger511100tag:blogger.com,1999:blog-8903062573109578036.post-30196441043478753202011-07-21T12:05:00.002+02:002011-07-21T12:06:17.087+02:00

Investigating Memory Leaks with Dtrace

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-76159947122782814702011-07-21T12:01:00.006+02:002011-07-21T12:12:04.318+02:00

Just recently we had Solaris panic. Yes - it happens ... Since this server had a lot of memory I was waiting quite a long (a few hours ...). Of course after the panic I was looking for information how to speed up the crush dump. The first page I met was Oracle Solaris 10 9/10 What's New (scroll down to "Fast Crash Dump"). So since Solaris 10 9/10 the performance of crash dump is improved a lot

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-80550730782252718042011-07-18T12:07:00.001+02:002011-07-18T12:09:02.342+02:00

Just recently I was looking for information when (what date) was particular server installed. We can check it using two ways (both using rpm): First way: rpm -qi basesystem Name        : basesystem                   Relocations: (not relocatable) Version     : 8.0                               Vendor: Red Hat, Inc. Release     : 5.1.1                         Build Date: Wed 12 Jul 2006 09:08:04

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-37795546174133358602011-06-10T09:15:00.001+02:002011-06-10T09:15:38.290+02:00

There is an interesting post which summarises what features has each release of ZFS: http://blogs.oracle.com/stw/entry/zfs_zpool_and_file_system Really worth reading.

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-728996923905002302011-06-03T16:30:00.004+02:002011-06-10T09:12:17.416+02:00

Just recently I needed to log file transfers using sftp. Here is short description how to achieve it (I am using RedHat/CentOS in my example).Edit file /etc/ssh/sshd_config and change line: Subsystem       sftp    /usr/libexec/openssh/sftp-server to Subsystem       sftp    /usr/libexec/openssh/sftp-server -l INFO and then restart ssh service: service ssh restart Having that you can

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-32708755127446628042011-04-04T16:18:00.003+02:002011-04-04T16:23:36.813+02:00

Recently I encountered a problem while shutting down Solaris 10 zone with an application which is closing quite long - it happened a few times that the application had not enough time for its shutdown. We can give more time for a zone by changing its properties using svccfg: # svccfg svc:> select system/zones svc:/system/zones> listprop stop/timeout_seconds stop/timeout_seconds count 100

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-683181620968638022011-02-10T12:28:00.002+01:002011-02-10T12:59:02.461+01:00

Instead of using GUI to list all jobs we can use CLI command /usr/openv/netbackup/bin/admincmd/bpdbjobs, e.g.: bash-3.00# /usr/openv/netbackup/bin/admincmd/bpdbjobs -report|head -3 JobID           Type State Status                 Policy    Schedule   Client Dest Media Svr Active PID FATPipe 42857         Backup  Done      0        server1-db      Differ   server1         server1      26952

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-32511033442326255862010-12-30T10:41:00.002+01:002010-12-30T12:43:03.555+01:00

Just recently I wanted to watch activity for some block devices on one of our CentOS systems. From manual: man sar ...        -d     Report activity for each block device (kernels 2.4 and newer only).   ... Let's try: server:/home/przemol>sar -d Requested activities not available in file Ops ! There is something wrong ! Since the sar activity is called (by default) every 10 minutes let's

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-51341792425569804962010-11-29T14:56:00.000+01:002010-11-29T14:56:29.401+01:00

It seems that some unconfirmed info about next Solaris 10 update are available: http://sparcv9.blogspot.com/2010/11/solaris-10-update-10-update.html

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-88265835319441744142010-08-18T21:28:00.001+02:002010-08-18T22:10:54.272+02:00

Adam Leventhal, one of the three Dtrace inventors, is leaving SUN/Oracle. No comments ... :-(

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-8257959119086161032010-07-26T21:54:00.002+02:002010-07-26T21:59:27.950+02:00

Brian Cantrill, one of the three Dtrace inventors, is leaving SUN/Oracle.I wonder how it is possible to loose such people like Brian.It is really sad ... :-(

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-46597133665445226022010-06-07T20:12:00.000+02:002010-06-07T20:12:00.885+02:00

I have just found amazing discuss between Jim Mauro, Brendan Gregg, and Roch Bourbonnais. I love it because my feeling are exactly the same and for a few last years I have been struggling with "users" who reports e.g. high CPU usage as a problem. Now I hope after watching this video some of them may see the light ... ;-)

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-2578896962005426182009-10-12T20:00:00.001+02:002010-12-30T10:43:45.799+01:00

Just recently I was doing another Solaris 10 server installation using Flash archive. This time I encountered the following error: ERROR: Archive found, but is not a valid Flash archive I was a bit surprised because I did so many flar installations ... . Anyway little Googling a found out where problem is - I have to remove file /var/sadm/system/admin/.platform The above file remembers what

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-15407417081446065802009-10-06T14:10:00.007+02:002009-10-06T15:27:50.492+02:00

A month ago I had a discussion with our DBA about how to make Oracle SGA memory ineligible for swapping/pagging (we had such accident). Conclusion was to use lock_sga parameter. A few days ago the DBA told me that Oracle support told him that the lock_sga parameter is not supported on Solaris. I didn't belive it and checked (you know, Google etc ;-) ). After a while it turned out that locking

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-54866491669398926642009-10-05T14:02:00.003+02:002009-10-05T14:04:55.457+02:00

# vxdctl hostid servername# cat /etc/vx/volbootvolboot 3.1 0.3 80hostid servernamehostguid {50b73d9c-1dd2-11b2-a839-002128045b8e}end###########################################################################################################################################################################################################################################################################

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-63405529737478678582009-09-23T09:02:00.001+02:002009-09-23T09:03:42.656+02:00

There is en excelent table about all Solaris releases.

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-54143615732089611032009-08-24T15:06:00.004+02:002009-08-24T15:33:33.098+02:00

While benchmarking storage I found interesting dependency between number of files and IOPS on Veritas FIle System. Below is configuration file for vdbench:*sd=sd1,lun=/vxfs/ams-vol/file1*sd=sd2,lun=/vxfs/ams-vol/file2*sd=sd3,lun=/vxfs/ams-vol/file3*sd=sd4,lun=/vxfs/ams-vol/file4*sd=sd5,lun=/vxfs/ams-vol/file5*sd=sd6,lun=/vxfs/ams-vol/file6*sd=sd7,lun=/vxfs/ams-vol/file7*sd=sd8,lun=/vxfs/ams-vol/

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-69283480278410964752009-08-14T20:55:00.000+02:002009-08-14T20:55:00.651+02:00

Just recently watching some java programs using DTrace I got the following messages:...dtrace: 7 jstack()/ustack() string table overflowsdtrace: 13 jstack()/ustack() string table overflowsdtrace: 9 jstack()/ustack() string table overflowsdtrace: 8 jstack()/ustack() string table overflowsdtrace: 13 jstack()/ustack() string table overflowsdtrace: 17 jstack()/ustack() string table overflowsdtrace: 8

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-82511244931184814702009-07-14T10:01:00.002+02:002009-07-14T10:20:21.786+02:00

There is an excellent blog entry by Brad Diggs where we can read about Solaris filesystem caches used by UFS and ZFS. It is divided into a few parts:IntroductionWhy Use Filesystem CacheSolaris Filesystem Caches: segmap cacheSolaris Filesystem Caches: Vnode Page Mapping cacheSolaris Filesystem Caches: ZFS Adaptive Replacement Cache (ARC)Solaris Filesystem Caches: Memory ContentionHow Filesystem

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-19335761930783011062009-07-14T09:18:00.002+02:002009-07-14T09:24:16.102+02:00

If you want to change the way zfs compresses you data you can use the following example:# zfs create pool/testfs# zfs get compression pool/testfsNAME PROPERTY VALUE SOURCEpool/testfs compression on inherited from pool# zfs set compression=gzip pool/testfs# zfs get compression pool/testfsNAME PROPERTY VALUE SOURCEpool/testfs compression gzip

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-70723515714988596312009-07-08T20:54:00.000+02:002009-07-08T20:54:00.437+02:00

How to query the current size of the intent log:# fsadm -F vxfs -L /vxfs/my-volUX:vxfs fsadm: INFO: V-3-25669: logsize=16384 blocks, logvol=""How to resize it:# fsadm -F vxfs -o logsize=32768 /vxfs/my-vol# fsadm -F vxfs -L /vxfs/my-volUX:vxfs fsadm: INFO: V-3-25669: logsize=32768 blocks, logvol=""Basically with bigger intent log recovery time is proportionately longer and the file system may

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-11978654736310438072009-07-03T13:30:00.002+02:002009-07-03T13:40:09.932+02:00

Just write 'vga=some_number' into the menu.lst file (if you use grub - does anybody use lilo yet ? ;-) ). Example values for some_number:1280x1024x64k (vga=794)1280x1024x256 (vga=775)1024x768x64k (vga=791)1024x768x32k (vga=790)1024x768x256 (vga=773)800x600x64k (vga=788)800x600x32k (vga=787)800x600x256 (vga=771)

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-13347464465151387292009-07-03T13:14:00.003+02:002009-07-03T13:30:09.673+02:00

This is perhaps my first blog entry related to Linux :-). Anyway I have just came across problem of moving one installed Debian (Lenny) to the other server. While rsync is a perfect solution for copying all the personal files I would like to avoid using it to copy all the Debian binaries. There is another, more reliable, way. On the source Debian just run:host1:~# dpkg --get-selections > /tmp/

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-25525887258416649562009-07-01T09:13:00.005+02:002009-07-01T09:28:22.591+02:00

I got the opportunity to present at the Storage GigaCon conference in Warsaw about month ago. My presentation covered a bit of "introduction" to storage (since my presentation was the first) and later I "switched" to storage performance benchmarking. Of course it would be difficult to not to mention Vdbench and SWAT :-)I wrote it in Polish and English (I know it is not a recommended way of

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-46610922916652547902009-07-01T08:49:00.006+02:002009-07-01T09:11:30.079+02:00

There is an excellent BluePrints article about DTrace probes in Postgresql. You can download it over here. Using DTrace you can get amazing information about internals of Postgresql, for instance (example taken from this article) having this DTrace script:# cat query_load.d#!/usr/sbin/dtrace -qsdtrace:::BEGIN{ printf(“Tracing... Hit Ctrl-C to end.\n”);}postgresql*:::query-start{ self->query =

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-89641452738504724802009-05-19T13:21:00.002+02:002009-05-19T13:39:41.152+02:00

If you are Veritas Volume Manager user you can use DMP to configure path failover and load balancing using many links (data paths) to storage. vxdmpadm is the command to do all the tasks. Just recently I had to check if data goes along configured links. You can achive this using the same vxdmpadm.To enable the gathering of statistics use this command:vxdmpadm iostat startTo reset the IO counters

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-47352769408232772212009-02-27T15:30:00.003+01:002009-02-27T15:34:40.711+01:00

There is an excellent article about nature of ZFS writing.You can read it over here.Highly recommended to read !

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-69184757152066146632009-02-16T16:55:00.003+01:002009-02-16T17:01:42.196+01:00

Jonathan Haslam described DTrace CPU Performance Counter provider which "... gives you the abilityto profile your system by many different types of processor related events; the list ofevents is processor specific and usually quite large but typically includes events suchas cycles executed, instructions executed, cache misses, TLB misses and many more ... ".All the information are here, here and

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-88521393428773549392009-02-05T10:08:00.003+01:002009-02-05T10:20:18.828+01:00

There is fantastic white paper how taking advantage of Solaris Dynamic Tracing (DTrace) probes can help simplify MySQL database application tuning. The content of this white paper:IntroductionApproaching MySQL Database Application TuningThe Advantages of Solaris Dynamic TracingSimplifying and Speeding Performance Tuning EffortsAnalyzing Query LoadsProbing the Cost of File Sort OperationsProfiling

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-66770755459144721232009-01-27T18:19:00.002+01:002009-01-27T18:19:00.383+01:00

We have a lot of archive logs from our Oracle databases. To save storage space we compress them. Of course this process (single threaded) on CMT-based CPUs takes quite long time. To use power of these CPUs we should parallelize all (if possible) tasks. Pbzip2 befriends us - it is a parallel implementation of the bzip2. This is an example:rudy:/tmp/l# ls -alhtotal 4194336drwxr-xr-x 2 root

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-17365408927908864152008-09-30T07:08:00.001+02:002008-09-30T07:10:20.640+02:00

While looking for some information I came across the following link :-)

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-90482833199297068602008-07-31T19:03:00.000+02:002008-07-31T19:03:00.671+02:00

There has been anouncement about SWAT - another tool helpful in performing benchmarking tests. Together with Vdbench we get almost the perfect couple for playing with storage benchmarking.

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-23359103589179474642008-06-08T19:56:00.004+02:002008-07-22T15:37:05.156+02:00

There are several tools which allow to test performance of filesystems like Iozone, Bonnie, FileBench. There is also one unknown widely called vdbench. It is disk I/O workload generator written by Sun's employee, Henk Vandenbergh and used internally at Sun and its customers.How does it differ from the others tools ? We'll see ... :-)Vdbench, besides classical CLI has also GUI which simplifies its

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com2tag:blogger.com,1999:blog-8903062573109578036.post-30844631936716455332008-02-17T15:48:00.007+01:002008-02-17T15:14:33.610+01:00

A few months ago we faced some performance problems on one of our servers. There is One Very Well Known Big Database (OVWKBD - complicated, isn't it ? ;-) ) running on it. One end user reported us that there are some hangs during office hours. We (me and one of ours DBA who is responsible for the OVWKBD) were surprised since it had never happened before (or, as I assume, nobody had told us before

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com2tag:blogger.com,1999:blog-8903062573109578036.post-84940504041065321562008-02-16T15:49:00.016+01:002008-12-09T02:35:03.489+01:00

A few months ago I compared performance of the above filesystems using filebench. Since then a few things changed:it is Solaris 10 8/07 available now (compared to Solaris 10 11/06 used during the previous test). Thanks to fabulous pca tool all (really all !) patches were installed.there is a new 1.1 filebench releasedthere is Veritas Storage Foundation Basic v5.0 for x64 (the last available

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com1tag:blogger.com,1999:blog-8903062573109578036.post-30909688790573451302008-02-11T18:33:00.000+01:002008-02-11T03:48:40.062+01:00

A few weeks ago I was trying to do Live Upgrade from Solaris 10 11/06 to 8/07. It went quite well until I decided to delete the old BE:bash-3.00# uname -aSunOS mickey 5.10 Generic_127112-07 i86pc i386 i86pcbash-3.00# cat /etc/release Solaris 10 8/07 s10x_u4wos_12b X86 Copyright 2007 Sun Microsystems, Inc. All Rights Reserved. Use is subject

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com1tag:blogger.com,1999:blog-8903062573109578036.post-50838294753729377352008-02-08T23:05:00.000+01:002008-02-08T23:14:25.168+01:00

Jarod Jenson, the famous Texas Ranger, first DTrace user outside of Sun, author of Java DVM provider , has changed company and now, after a silence, is back with his blog !

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-63605922793816654822007-10-03T20:21:00.001+02:002008-04-18T13:38:03.460+02:00

There is an excellent document released two days ago at Sunsolve:A deeper look into vmstat statistics using DTrace and mdbThe document describes how to drill down into vmstat statistics using DTrace and mdb. There are so many fantastic DTrace and mdb commands that it is really worth looking (like any other DTrace documentation ;-) )I like especially the mdb command to see swapped out processes:

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com1tag:blogger.com,1999:blog-8903062573109578036.post-52236018134970623382007-08-07T14:36:00.000+02:002008-12-09T02:35:03.678+01:00

Back from holidays. Yes. :-)I wish it were longer ... But coming back to reality.While ZFS is renown for its love to particular disks not RAID arrays, I wanted to test how it works on such array. The reason for the test is that in datacenters RAID arrays are wide-spread and this is rather difficult to find servers rooms where disks (without HW RAID) are dominant. At the moment I could test only

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com4tag:blogger.com,1999:blog-8903062573109578036.post-81918964680907175522007-06-15T22:46:00.000+02:002007-06-15T10:53:33.469+02:00

There is interesting entry at http://blogs.sun.com/Peerapong/entry/solaris_zfs_performanceabout performance comparison of ZFS versus VxFS, ext3 and NTFS. While in almost all workloads ZFS is better or at least comparable to those three, in one of the most often met environments, OLTP with noncached, 8kB io (like Oracle on filesystem mounted without buffering - aka directio), VxFS is still almost

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-18048864342012476852007-06-06T19:57:00.000+02:002007-06-06T11:41:09.176+02:00

We have one application based on postgresql database. Recently we encountered some performance problems with uploading bigger amount of data into the database. To find out what is going on I wanted to compare normal utility of the server to the state when we are loading the additional data and see the differences. One of the things to watch was IO. To see what the server was doing at the moment I

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-36516281618136766282007-05-21T18:58:00.000+02:002007-05-21T10:29:18.466+02:00

My last struggles with application in java led me to the following observations (again from the very begin): PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP 27607 inkaso 502M 436M sleep 59 0 10:59:30 5.4% java/91 517 root 3916K 3080K sleep 59 0 0:02:09 0.1% nscd/26 18198 root 2848K 2732K cpu1 59 0 0:00:00 0.0% prstat/1 18202 root 964K

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-24125187150568351372007-05-15T22:21:00.000+02:002007-05-15T14:38:34.405+02:00

I always forget how to change configuration of already configured zone. I hope from now on I won't forget it.How to remove fs already defined/assigned to a zone:bash-3.00# zonecfg -z urticaSzonecfg:urticaS> infozonepath: /zones/urticaSautoboot: truepool:inherit-pkg-dir:dir: /libinherit-pkg-dir:dir: /platforminherit-pkg-dir:dir: /sbininherit-pkg-dir:dir: /usrfs:dir: /d8special: /vxfs/

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com1tag:blogger.com,1999:blog-8903062573109578036.post-26172425208224528072007-05-15T19:28:00.000+02:002007-05-15T14:55:09.953+02:00

Do you remember my last problem with java application which behaves strangely ? Changing memory allocator from standard malloc into mtmalloc has not changed a lot. There is still high cpu pressure.I thought for a while how to change approach to catch what is wrong with the application. Because prstat can show which thread is using cpu I started again with it: PID USERNAME SIZE RSS STATE

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-44394102433108636082007-04-27T13:21:00.001+02:002007-04-27T13:33:36.158+02:00

If you are interested in performance tuning of T2000 and applications working on the server, the following links might be helpfull: T2000 performance tuning guide. http://www.solarisinternals.com/wiki/index.php/Hardware/Platform_Specific_Tuning http://developers.sun.com/solaris/articles/db2_t2000.html http://blogs.digitar.com/media/2/T2000_Experience.pdf

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-28746740567988217672007-04-03T22:04:00.000+02:002008-12-09T02:35:03.887+01:00

Recently we were doing internal basic performance tests of apache(+php) webserver on Fedora and Solaris 10. Both systems (working in 64bit mode) were installed on two identical, small servers (Intel CPU 3.2 GHz, RAM 512 MB). While this configuration is rather not popular in big datacenters we wanted to test both OSes (in performance terms). At the begin there were no OS tuning and both servers

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-91686512820077197192007-03-16T21:41:00.000+01:002007-03-16T09:48:55.766+01:00

If you are looking for simple example how one dtrace script can help in performance problems just look at that link: http://blogs.sun.com/portalperformance/entry/hire_dtrace_detective_to_exposeJust six lines of dtrace script.The simplicity of the example is astounding.

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-44264121419902782932007-03-13T19:35:00.000+01:002007-03-19T13:51:51.945+01:00

While looking for information regarding MySQL tuning on T2000 I found the following links useful: http://blogs.sun.com/yufei/entry/mysql_innodb_performance_tuning_on http://developers.sun.com/solaris/articles/mysql_perf_tune.html http://hell.jedicoder.net/?p=88

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-48073734185481804272007-03-02T18:37:00.000+01:002007-03-02T15:07:23.347+01:00

There is interesting document "Limiting Service Privileges in the Solaris 10 Operating System " which describe how to start services with limited privileges: http://www.sun.com/blueprints/0505/819-2680.pdfand http://www.sun.com/software/solaris/howtoguides/s10securityhowto.jsp#5The examples uses Apache webserver and show how to start it as non-root user.

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-61658782326559575812007-02-15T19:16:00.000+01:002007-05-15T14:54:38.635+02:00

We have application written in java which is a sort of proxy between mobile device and our database. Every time end user commits some transaction on the mobile device, it is sent to the application which, on behalf of the device, commits it in database. It works very well and doesn't overload server. In fact cpu is almost all the time idle (sar output):...08:00:00 1 0 0

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0tag:blogger.com,1999:blog-8903062573109578036.post-53426306552254321442007-02-14T21:46:00.000+01:002007-04-21T01:33:55.191+02:00

My name is Przemysław Bąk (nickname: przemol) and I am UNIX sysadmins in Lodz, Poland. Finally I decided to write a blog. Area of interest: Performance tuning Solaris (especially Solaris 10) Dtrace Unix in general Storage ... The future is unknown ... ;-)

Przemysław Bąk (przemol)http://www.blogger.com/profile/14112590629700375970noreply@blogger.com0