similar to: IO probes and forcedirectio

Displaying 20 results from an estimated 600 matches similar to: "IO probes and forcedirectio"

2008 Dec 02
18
How to dig deeper
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("
2010 Feb 19
3
samba file locking
Hi samba experts, We have a strange file locking problem and i hope someone can help. We use some CentOS 5 servers, which use samba 3.0.33, to share files of a java application to clients. Clients are mostly CentOS 5 (same version as the server), but there are a few legacy windows clients (the reason why we use samba and not nfs). And now the problem. When our developer uploads a new jar file to
2008 Aug 13
1
tracing blocks behind I/O
Hi, I know how to trace the number of bytes read/written by a program by summing the argument of that read/write syscall. However, the way the OS services read/write calls is in blocks. I wonder if it''s possible to trace the actual number of blocks read/written caused by the syscalls? -- This message posted from opensolaris.org
2008 Jun 09
6
Dtrace on OpenSolaris/VirtualBox
I''m running OpenSolaris 2008.05 in VirtualBox on a Windows XP host. Playing around with various probes, I found that trying to load any probe associated with bdev_strategy dumps core. I can think of one or two likely and reasonable causes for this, but am assuming it''s undesirable behavior. Anyone know what''s happening here? -- This message posted from
2005 Sep 16
5
ddi_pathname
Hello, I can see that there is an implementation/emulation of ddi_pathname in DTrace, but I''m a bit confused about the capabilities and invocation of this function. I would like to diplay the path to the block device from bdev_strategy and other io:genunix::start probes. If someone is familiar with ddi_pathname, could you please provide an example invocation? Thanks, Michael This
2008 Apr 01
3
Xen without APIC
Hi, I am trying to boot Xen on top of a simulator. I am having problems with the APIC module in my simulator, not related to Xen. So, I want to boot Xen without APIC support. Is there a way to disable APIC support in Xen? I am fine even Xen is restricted to uni-processor environment. Thanks, Bhaskar _______________________________________________ Xen-users mailing list
2009 Dec 17
3
Looking for help on 2 items...
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
2007 Sep 18
3
newbie question about a dbuf-arc eviction race
Hi, Can a dbuf be in DB_CACHED state, db_holds == 0, b_efunc != NULL while its db_buf is put on the eviction list ? From an ASSERT in dbuf_do_evict(), it appears that it can. If it can, I am wondering what is preventing the following race dbuf_hold_impl() db = dbuf_find(dn, level, blkid); ... if (db->db_buf && refcount_is_zero(&db->db_holds)) {
2007 May 29
6
NCQ performance
I''ve been looking into the performance impact of NCQ. Here''s what i found out: http://blogs.sun.com/erickustarz/entry/ncq_performance_analysis Curiously, there''s not too much performance data on NCQ available via a google search ... enjoy, eric
2008 Apr 01
2
Xen Log messages
Hi, I am a newbie to Xen. How can I see the Xen hypervisor boot messages? Is there any command similar to dmesg to check the boot log of Xen? Thanks, Bhaskar _______________________________________________ Xen-users mailing list Xen-users@lists.xensource.com http://lists.xensource.com/xen-users
2017 Jun 26
3
Request for help - adding text files to a data frame
Hello Everyone, I have a data frame which looks something like this: V1 <-c(1,2,3) V2 <-c(5,6,7) V3 <-c(9,10,11) df <- data.frame(V1,V2,V3) I want to add couple of text files at the beginning of df and save the df as a csv file. The csv file should look something like this: "AAAAAAAA" "BBBBBBBBB" "CCCCCCCCC" V1 V2 V3 1 5 9 2
2008 Aug 05
4
Mini-OS and Xen!
Hi I have a doubt regarding Mini-OS and Xen. If it is true that Xen reserves in the virtual address space the top 64MB on 32bit systems and 168MB in PAE systems, doesn''t it exist with a Mini-OS kernel which has only 32MB in size i.e. going by its default config file? Obviously I''m missing something. Regards, Bhaskar. _______________________________________________ Xen-devel
2008 Jan 31
1
simulating directio on zfs?
The big problem that I have with non-directio is that buffering delays program execution. When reading/writing files that are many times larger than RAM without directio, it is very apparent that system response drops through the floor- it can take several minutes for an ssh login to prompt for a password. This is true both for UFS and ZFS. Repeat the exercise with directio on UFS and there is no
2012 Jun 04
2
Frequently login problem
Hi, I am using dovecot 2.1.3 on centos 5.7. It was working fine but last few days I need to restart or reload dovecot service because at that time users are not able to login. Each time I am getting information from doveco.log is as : Jun 04 11:52:54 auth: Error: BUG: Authentication client gave a PID 17564 of existing connection Jun 04 11:52:54 auth: Error: BUG: Authentication client gave a PID
2009 Apr 20
6
simulating directio on zfs?
I had to let this go and get on with testing DB2 on Solaris. I had to abandon zfs on local discs in x64 Solaris 10 5/08. The situation was that: * DB2 buffer pools occupied up to 90% of 32GB RAM on each host * DB2 cached the entire database in its buffer pools o having the file system repeat this was not helpful * running high-load DB2 tests for 2 weeks showed 100%
2011 Oct 26
1
Re: ceph on btrfs [was Re: ceph on non-btrfs file systems]
2011/10/26 Sage Weil <sage@newdream.net>: > On Wed, 26 Oct 2011, Christian Brunner wrote: >> >> > Christian, have you tweaked those settings in your ceph.conf?  It would be >> >> > something like ''journal dio = false''.  If not, can you verify that >> >> > directio shows true when the journal is initialized from your osd log?
2007 Nov 21
1
OpenSolaris not booting
I finally managed to tar the kernel and install it but it doesn’t boot the system and now I get the following error: - Failed to get ramdisk from boot Unexpected trap Error code, optional 0x0 Code segment 0x28 Flags register 0x10046 Retyrn %rsp 0xc0cfd0 Return %ss 0x8 There is no stack trace and I get a similar error right below the one above when the system tries to backtrace and it says
2007 Nov 21
6
Compiling issue on x86!
Hi thanks for your posts so far. Since what I had assumed was a 32 bit kernel which I compiled didn''t work, I religiously set out on compiling a 64 bit version as my system is currently booted in 64 bit mode. I installed SUNStudio12 on the system and set the SPRO_VROOT to point towards it and when I do a make all in usr/src directory, I get the following error when make cwds and runs in
2006 Oct 15
3
open(2) O_DIRECT on smbmount gives EINVAL
Does samba 3.0.23c not support the use of O_DIRECT? When I try to open an smbmount'd file using O_DIRECT, I get EINVAL. I am able to use O_DIRECT with no problems on a block device and nfs mounts, so I know the kernel supports it. samba: 3.0.23c kernel: 2.6.9-42.0.3.EL (32-bit) I am using the below code for my test. smb fails on open(2). #include <fcntl.h> #include
2007 Oct 08
2
safe zfs-level snapshots with a UFS-on-ZVOL filesystem?
I had some trouble installing a zone on ZFS with S10u4 (bug in the postgres packages) that went away when I used a ZVOL-backed UFS filesystem for the zonepath. I thought I''d push on with the experiment (in the hope Live Upgrade would be able to upgrade such a zone). It''s a bit unwieldy, but everything worked reasonably well - performance isn''t much worse than straight