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34753 discussions

Intel Xeon and hyperthreading
by Sam Drinkard 08 Jun '06

08 Jun '06

Another question some of you may help me make decisions on. I've been doing some reading that indicates that having HT turned on in this dual xeon machine might actually slow down the computing process rather than speeding it up. I rebooted this a.m., and turned HT off, just prior to my main application run. One thing that might be of note, this application is using OMP for utilizing both cpu's, and prior to turning off HT, I had been running the software using 2 cpu's of the 4 that the OS sees. I'm waiting on a model run to finish to see if there is any appreciable difference, but the one thing I do notice right off is cpu utilization is running close to 100% on both, where before, it averaged maybe 50% or thereabouts. Again, sar is showing at last count, 83.56% utilization for user, 10.27% system and only 0.02% nice. Idle was 5.74%. I'm attempting to squeeze every last bit of processing power out of this machine, and would entertain suggestions on tuning if there happen to be any types of tuning that would help. Sam -- Sam W.Drinkard -- sam(a)wa4phy.net http://wa4phy.net Augusta Area Mesonet cell 706.825.8513 Home 706.868.7253 MAIL 4428 Branchwood Drive, Martinez Georgia, 30907-1304

4 11

CentOSPlus Kernel for 586?
by William L. Maltby 08 Jun '06

08 Jun '06

I have the problem that I almost never throw anything away that can still be useful. In itself, not bad. Combined with the "World We Live In" (TM), a "Less Than Optimal Behavior" (SM). I need some of the features in CentOSPlus kernels for my 586 (K6-III). 1) I don't mind doing it myself and contributing results, if that's what it takes. Only having LFS experience (rpm nu2me), I anticipate a "learning curve" and a minimal amount of hand holding. Since I keep abreast of the lists, know how to Google the list, have heavy development background and *light* and *ancient* admin (but for my little nook here), ... (you get it) hand-holding should be very little. 2) My target machine has a minimal (mostly) CentOS 4.3 kept up-to-date and plenty of HD. Also have a 2.2PR Athlon w/768M DR ram, plenty of hd, so cross-compile (I don't remember details from my LFS days) is reasonable. 3) I am already subscribed to the developer's list if that is needed (I think, don't recall if I saw anything from there). 4) DOWNSIDE (maybe more?) Karnbir might have to tolerate my occasional short outbursts of humor as they help extend the lifespan of various pieces of equipment in my little nook. I'll let that go someday when I have milked it for all I think it's worth. ;-) 5) Additional delay because I'm reading studiously trying to learn new/updated admin related stuff. It seems that since security became a concern, the *necessary* bloat to functions is unbelievable (I'd be afraid to read the estimates of % of budget devoted to security nation- wide). 6) OTOH (there's always one, eh?) if the walkers-on-water denizens of the list/project want to make one available, I can keep learning/configuring my nook and contribute somehow later on. TIA -- Bill

2 6

PHP Extensions
by Claudio Castro 08 Jun '06

08 Jun '06

Hi all, I have a problem, I'm running CentOS 4.3 and I just installed php with yum, later I realize that I nedd LDAP support so I download the php-ldap rpm with yum, everything was OK...but now..the problem is that I need Informix support, so I search for a php-ifx module to see if it exist...but no. So, what are my options? recompile a fresh new php with informix support...loosing the automatic updates with yum... or compile php with informix support in another machine and then copy the "informix.so" to "/usr/lib/php4/"? will that work? Claudio

4 7

Apache php and exim
by Lazy 08 Jun '06

08 Jun '06

Hello, I'm using the targeted policy. PHP's mail() function fails because of selinux. audit(1149662369.454:2): avc: denied { setgid } for pid=18085 comm="sendmail" capability=6 scontext=root:system_r:httpd_sys_script_t tcontext=root:system_r:httpd_sys_script_t tclass=capability When i turn to permisive mode: audit(1149668677.105:12): avc: denied { setuid } for pid=29159 comm="sendmail" capability=7 scontext=root:system_r:ht tpd_sys_script_t tcontext=root:system_r:httpd_sys_script_t tclass=capability audit(1149668677.157:13): avc: denied { dac_override } for pid=29159 comm="sendmail" capability=1 scontext=root:syste m_r:httpd_sys_script_t tcontext=root:system_r:httpd_sys_script_t tclass=capability audit(1149668677.209:14): avc: denied { write } for pid=29159 comm="sendmail" name="input" dev=dm-3 ino=1335707 scont ext=root:system_r:httpd_sys_script_t tcontext=system_u:object_r:var_spool_t tclass=dir audit(1149668677.209:15): avc: denied { add_name } for pid=29159 comm="sendmail" name="1FntLB-0007aJ-6i-D" scontext=r oot:system_r:httpd_sys_script_t tcontext=system_u:object_r:var_spool_t tclass=dir Maybe there should be a context change to some mta specific context diuring the execution of /usr/sbin/sendmail. ls -Z /usr/zbin -rwsr-xr-x root root system_u:object_r:sbin_t /usr/sbin/exim lrwxrwxrwx root root root:object_r:sbin_t /usr/sbin/sendmail -> /etc/alternatives/mta lrwxrwxrwx root root system_u:object_r:sbin_t /usr/sbin/sendmail.exim -> exim Maybe exim shuld be sendmail_exec_t ? I can't experiment now. Will try setting it later. Can anyone give me some guaidance ?

3 3

(?) Loss of fullscreen mode with freenx-0.5.0-8.c4
by Jay Leafey 08 Jun '06

08 Jun '06

I've currently got the nx-1.5.0-1.centos4.i386, freenx-0.5.0-8.c4.noarch, and nxclient-1.5.0-141.i386 packages installed on a couple of CentOS 4 update 3 systems and I'm getting the same results on all of them. I got the new version of freenx via "yum update" and it appears to have "broken" fullscreen mode. The connection config file I have been using does have the "fullscreen" option set (<option key="Resolution" value="fullscreen" />) but wheras it used to really go into fullscreen mode it does not since the update. I now see the top and bottom panels from the "parent" display and a window title on the NX client window, which is not what I was getting in "fullscreen" mode with 0.4.4. I reran the connection wizard and created a new connection, insuring that the options were what I wanted, but it still has the same behaviour. I downgraded freenx to the 0.4.4-1.centos4 package and the expected behaviour returned. Am I screwing up somewhere, or did I miss something in the documentation? Any thoughts? Thanks! -- Jay Leafey - Memphis, TN jay.leafey(a)mindless.com

4 4

inscribirme
by Mónica Marcela De los Rios A 08 Jun '06

08 Jun '06

Mónica Marcela De los rios A. Ingeniera de Soporte de red CABLEPACIFICO S.A. Tel: 319 93 82 Ext. 312 e-mail:mdelosrios@cablepacifico.com -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean.

1 0

Swap
by Sam Drinkard 08 Jun '06

08 Jun '06

I know this is more of a general unix question, but the thread about the last kernel update, and memory usage got me to looking and thinking. Given a system with 2 Gb of memory, and at peak usage, top reports considerably less than the 2 gig amount in use, as well as system monitoring that never shows all available memory used, what would happen if you just turned swap off, and let memory handle things? This machine here, has now crept up to using just under 400mb of swap, yet I've never seen total memory usage above about 1.4gb. I'm a bit leary of just "swapoff" while the machine is running the weather model, as I'd hate to crash things, but I'm just wondering if turning off swap (assuming the system is actually using the disks) would break things or in the best case, speed things up. -- Sam W.Drinkard -- sam(a)wa4phy.net http://wa4phy.net Augusta Area Mesonet cell 706.825.8513 Home 706.868.7253 MAIL 4428 Branchwood Drive, Martinez Georgia, 30907-1304

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Swap memory: I can't reconcile this stuff.
by William L. Maltby 08 Jun '06

08 Jun '06

I need to look more into it, but before I start the long and arduous "googling my life away" process, I figured someone might know the answer. I've read the man pages several times and they didn't change! :-( As normal, while looking at one thing, something else bites my butt. I tuned on the swap field in top and sort on it. Here's an edited snippet of the results. Mem: 775708k total, 764752k used, 10956k free, 60780k buffers Swap: 1572856k total, 160k used, 1572696k free, 377324k cached PID VIRT RES SHR %MEM SWAP COMMAND 24729 127m 32m 15m 4.3 94m evolution 3409 97220 5268 4304 0.7 89m evolution-data- 2851 115m 36m 7120 4.8 79m X 10937 109m 45m 14m 6.0 63m firefox-bin 3417 63076 7876 6756 1.0 53m evolution-alarm 3363 40332 7284 6228 0.9 32m eggcups 24745 37480 8176 6876 1.1 28m evolution-excha 3736 53272 29m 8660 3.9 22m gnome-terminal 3361 44404 21m 10m 2.9 21m nautilus 3357 39868 21m 10m 2.8 17m gnome-panel 4096 25460 7600 5960 1.0 17m gkrellm 3373 20488 3492 2944 0.5 16m gnome-vfs-daemo 3367 43608 26m 10m 3.4 16m rhn-applet-gui 3359 19904 6128 5316 0.8 13m gnome-volume-ma 3387 20904 8068 6696 1.0 12m clock-applet 3389 19456 6648 5696 0.9 12m notification-ar 3316 19080 7140 5960 0.9 11m gnome-settings- 3385 22304 10m 7576 1.4 11m mixer_applet2 3244 21508 9960 6868 1.3 11m gnome-session 4144 22476 10m 7456 1.4 11m wnck-applet 2587 12412 2364 1940 0.3 9.8m gdm-binary 2846 13220 3340 2728 0.4 9880 gdm-binary 3365 13812 4532 3920 0.6 9280 pam-panel-icon 3355 14768 7524 5984 1.0 7244 metacity 7182 10328 3436 2280 0.4 6892 sendmail 18501 11080 4248 1912 0.5 6832 cupsd Note that the summary line says 160k of swap is used. The man pages say the summary and the details under "SWAP" are both reported in "k". No mention of "m" is made, I presume that it means "megabytes"? If so, I can't reconcile what I'm seeing. Free seems to support the summary lines. total used free... Mem: 775708 764772 10936... -/+ buffers/cache: 326584 449124 Swap: 1572856 160 1572696 Cat of /proc/meminfo also seems to support the summary lines. SwapTotal: 1572856 kB SwapFree: 1572696 kB Now, if I treat all those numbers ending in "m" as megabytes, it doesn't take long to see that I've been lied to somewhere along the way. Or alternatively, I'm dense and "Just Don't Get It" (TM). Any help? -- Bill

7 28

RE: [CentOS] Simple backup program
by Bowie Bailey 07 Jun '06

07 Jun '06

Paul Heinlein wrote: > > Bacula (www.bacula.org) will do what you want, though wading through > the initial configuration process can take a couple hours. Tape > spanning is well supported; backups can be scheduled or initiated from > the command line; the cli restore process has an interface similar to > dump/restore, so it's fairly easy to navigate. > > We use it to back up CentOS, Debian, Gentoo, and OS X to tape. Will the el3 rpms work with CentOS4? Which rpms do I need? -- Bowie

3 2

Fedora source packages on Centos -- libtiff again
by Robert Moskowitz 07 Jun '06

07 Jun '06

In my seeking a managable way to build libtiff, on the Asterfax forum I got the following recommendation (from another fax user that made the move to libtiff 3.8.2): ================================================================ Hi Robert, I have compiled libtiff-3.8.2 from the source package for my Fedora Core 4 machine. I am not sure about CentOS, but I think you can try to do the same with rpmbuild and the source package for Fedora: - Install the rpmbuild tools in CentOS; - Download the source package for Fedora: <http://mirrors.ircam.fr/pub/atrpms/src/fc6-i386/redhat/SRPMS.updates/libtif…>http://mirrors.ircam.fr/pub/atrpms/src/fc6-i386/redhat/SRPMS.updates/libtif… - Install the source package as a non-root user: rpm -ivh libtiff-3.8.2-2.src.rpm - Go to your rpmbuild folder: cd ~/rpmbuild - Rebuild the package: rpmbuild -ba SPECS/libtiff.spec If everything goes well, you will find a brand new set of RPM packages in the ~/rpmbuild/RPMS/i386/ (replace i386 for your actual architecture if you're not building on i386), which you can install with the upgrade RPM command: rpm -Uvh libtiff-3.8.2*.rpm ================================================================ Does this 'look right' for Centos? If not what do I change? And how do I get the rpmbuild tools? yum install rpmbuild ?? Finally, once I have built 3.8.2, how would I migrate it to other systems?

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