similar to: memory allocation

Hello, we are using hardware array and its vendor recommends the following setting in /etc/system: set sd:sd_max_throttle = <value> or set ssd:ssd_max_throttle = <value> Is it possible to monitor *somehow* whether the variable becomes sort of bottleneck ? Or how its value influences io traffic ? Regards przemol

HI, The question is a ZFS performance question in reguards to SAN traffic. We are trying to benchmark ZFS vx VxFS file systems and I get the following performance results. Test Setup: Solaris 10: 11/06 Dual port Qlogic HBA with SFCSM (for ZFS) and DMP (of VxFS) Sun Fire v490 server LSI Raid 3994 on backend ZFS Record Size: 128KB (default) VxFS Block Size: 8KB(default) The only thing

I''m looking for a suggestion on a good way to hunt down the source of high context switching and mutex contentions... Is dtrace the way to go now, or should I stick with something like lockstat? Russ This is a 5 second interval for mpstat: CPU minf mjf xcal intr ithr csw icsw migr smtx srw syscl usr sys wt idl 16 0 0 1115 1241 206 9095 912 2420 7393 0 12105 68 25

[Just starting out with DTrace and was hoping to get some guidance.] I have a "benchmark" program that I monitored with both prstat (prstat -mL -P <PID>) and pfilestat (from the DTrace toolkit). Prstat reports LAT values in the 0.1-0.2% range, but pfilestat reports "waitcpu" values in the 6-10%. Since those two numbers supposedly represent time waiting for the CPU,

Hi all, I remember at OSCON 2005 there was talk of adding DTrace probes to PHP (in fact, I have a photo of Bryan and Wes working on it!). Did they ever get into the upstream branch, ''cause I don''t recall seeing a --enable-dtrace (or similar) configuration option when I recently built PHP 5.2.1. If not, is there an ETA? TIA, -- Rich Teer, SCSA, SCNA, SCSECA, OpenSolaris CAB

I am looking for Dtrace scripts that can be used to collect data during performance tests. I am especially interested in IO but CPU, memory, threads, etc are needed as well. Thanks, Dave

I have a SunRay server that I am looking at to determine some sizing requirements in my department. The machine has 16G of ram and 10G of swap. Currently, I have about 4G of swap used. I am wondering if dtrace/mdb can be used to find out what lwp/processes have been swapped out? Any hints? This message posted from opensolaris.org

In order to get more information on IO performance problems I created the script below: #!/usr/sbin/dtrace -s #pragma D option flowindent syscall::*write*:entry /pid == $1 && guard++ == 0/ { self -> ts = timestamp; self->traceme = 1; printf("fd: %d", arg0); } fbt::: /self->traceme/ { /* elapsd =timestamp - self -> ts; printf("

1.) after initializing a ogg_stream_state may I just keep calling ogg_stream_packetin with valid ogg_packet's until no more ogg_packets needs to be added? Or do I need to call ogg_stream_pageout after every ogg_stream_packetin? Iaw may I delay calling ogg_stream_pageout until there are no more packets to be added? 2.) I assume I have call ogg_stream_pageout until no more pages can be

Howdy, Is there a method to get the number of elements in an aggregation? Are the results stored in an aggregation guaranteed to be in any type of order? Thanks for any insight, - Ryan -- UNIX Administrator http://daemons.net/~matty

Does anyone out there have any thoughts on the type of load common DTrace scripts would cause on a system if run 24x7? I know "common DTrace scripts" and their underlining probe calls a vague statement. So for the lack of a common and establish set of scripts in the OS, I''ll use the most popular right for my question...the DTraceToolkit from Brendan Gregg. Which by the

Hi world, I have a 10-disk RAID-Z2 system with 4 GB of DDR2 RAM and a 3 GHz Core 2 Duo. It''s exporting ~280 filesystems over NFS to about half a dozen machines. Under some loads (in particular, any attempts to rsync between another machine and this one over SSH), the machine''s load average sometimes goes insane (27+), and it appears to all be in kernel-land (as nothing in

when check java process lock statistics, plockstat failed, please see below: # prstat -mLp 21162 PID USERNAME USR SYS TRP TFL DFL LCK SLP LAT VCX ICX SCL SIG PROCESS/LWPID 21162 7677 0.9 0.1 0.0 0.0 0.0 99 0.0 0.3 83 89 215 0 java/81 21162 7677 0.3 0.1 0.0 0.0 0.0 0.0 99 0.2 106 33 305 0 java/35 21162 7677 0.1 0.0 0.0 0.0 0.0 100 0.0 0.1 79 6 85 0 java/59

I am pretty new to Dtrace but use the Dtrace Toolkit when trying to troubleshoot I/O issues On Oracle. I am looking for help on how to do the following: I am trying to answer whether adding more HBA Cards/ports would be effective. To do this, I need to know the i/o''s per second As well as total bandwidth per second. Has anyone done this before? Does anyone have any other ideas on how

So I have this dual 16-core Opteron Dell R715 with 128G of RAM attached to a SuperMicro disk enclosure with 45 2TB Toshiba SAS drives (via two LSI 9200 controllers and MPxIO) running OpenIndiana 151a4 and I''m occasionally seeing a storm of xcalls on one of the 32 VCPUs (>100000 xcalls a second). The machine is pretty much idle, only receiving a bunch of multicast video streams and

Hi ! I have a server (Centos 5) that is using a pair of SAS drives to store the data. (Mail server) They are on an adaptec raid controler with a battery backup and write back cache active. >From time to time, I have sever peak io to those data disks (> 400 to 500 iops, > 70 to 100 megs/sec). With iostat, I find that it's almost a write i/o problem. How can I find to which files

Not that many people are streaming FLAC, and if they are, they are, in my mind, undoubtedly experiencing problems. Probably the most prized kind of software problem of all, the intermittent kind. I am streaming FLAC. 24bit no less, and its fantastic. The future I would like to live in, is one where lossless music is streamed and heard by people other than myself. It is generally not possible to

Dear Experts, Is there a foolproof way of getting hostid on solaris 10 sparc? I am asking this because i have seen Dtrace scripts which allow to change hostid. I want this because i want to tie down my application to specific host and do not want my client to re-use it on other machine just by changing hostid. Thanks, -- This message posted from opensolaris.org

>From time to time a jboss process would end eating all, the available CPU and the load avg would skyrocket. Once the operators restarted jboss, the system''d be normal again (sometimes for weeks) until the next incident Since we moved the app from a v440 running Solaris 10 8/07 to a t2000 running Solaris 10 5/08 the problem started to happen more frequently (2-3 times a week). The

Hello, one of our developers is developing his Web applications (PHP-based+MySql) on 64-bit Fedora. He would like to use the same, 64-bit environment on CentOS. I am not against 64-bits (we use it for many, many years using Solaris) but what concerns me is the stability of 64-bit Linux. Can you share your experience regarding stability of 32-bit and 64-bit CentOS ? Does anybody use 64-bit CentOS