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• High IOWait executing JBoss 3.2.7

  - by user64205

  Server Details: Kernel: Linux wiq31 2.4.21-9.ELsmp #1 SMP Thu Jan 8 17:08:56 EST 2004 i686 i686 i386 GNU/Linux CPU: 4 x Intel(R) Xeon(TM) CPU 3.06GHz Memory: 1028520 kB JBoss version: 3.2.7 Every time i try to start JBoss, in all CPU's, the iowait values starts to raise and the idle values starts to fall. Before executing my JBoss application, the free command returns the following output: *total used free shared buffers cached Mem: 1028520 966400 62120 0 187756 538928 -/+ buffers/cache: 239716 788804 Swap: 2044072 790672 1253400* After starting my JBoss application, the free command returns the following output: *total used free shared buffers cached Mem: 1028520 1007648 20872 0 187116 524084 -/+ buffers/cache: 296448 732072 Swap: 2044072 819096 1224976* After starting my JBoss application, without answering any request, the java process /proc/PID/status file have the following values: State: S (sleeping) SleepAVG: 27% Tgid: 24022 Pid: 24022 PPid: 21011 TracerPid: 0 Uid: 500 500 500 500 Gid: 500 500 500 500 FDSize: 256 Groups: 500 VmSize: 775200 kB VmLck: 0 kB VmRSS: 156752 kB VmData: 696752 kB VmStk: 36 kB VmExe: 21 kB VmLib: 710375 kB StaBrk: 0804f000 kB Brk: 095bb000 kB StaStk: bffff8c0 kB ExecLim: ffffffff Threads: 62 SigPnd: 0000000000000000 ShdPnd: 0000000000000000 SigBlk: 0000000000000000 SigIgn: 0000000000000000 SigCgt: 1000000180015ccf CapInh: 0000000000000000 CapPrm: 0000000000000000 CapEff: 0000000000000000 Is this behavior being caused by memory swapping, or the short memory available in the server is enough to run my application?

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• Surprising corruption and never-ending fsck after resizing a filesystem.

  - by Steve Kemp

  System in question has Debian Lenny installed, running a 2.65.27.38 kernel. System has 16Gb memory, and 8x1Tb drives running behind a 3Ware RAID card. The storage is managed via LVM. Short version: Running a KVM guest which had 1.7Tb storage allocated to it. The guest was reaching a full-disk. So we decided to resize the disk that it was running upon We're pretty familiar with LVM, and KVM, so we figured this would be a painless operation: Stop the KVM guest. Extend the size of the LVM partition: "lvextend -L+500Gb ..." Check the filesystem : "e2fsck -f /dev/mapper/..." Resize the filesystem: "resize2fs /dev/mapper/" Start the guest. The guest booted successfully, and running "df" showed the extra space, however a short time later the system decided to remount the filesystem read-only, without any explicit indication of error. Being paranoid we shut the guest down and ran the filesystem check again, given the new size of the filesystem we expected this to take a while, however it has now been running for 24 hours and there is no indication of how long it will take. Using strace I can see the fsck is "doing stuff", similarly running "vmstat 1" I can see that there are a lot of block input/output operations occurring. So now my question is threefold: Has anybody come across a similar situation? Generally we've done this kind of resize in the past with zero issues. What is the most likely cause? (3Ware card shows the RAID arrays of the backing stores as being A-OK, the host system hasn't rebooted and nothing in dmesg looks important/unusual) Ignoring brtfs + ext3 (not mature enough to trust) should we make our larger partitions in a different filesystem in the future to avoid either this corruption (whatever the cause) or reduce the fsck time? xfs seems like the obvious candidate?

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• Apache: How to redirect OPTIONS request with .htaccess?

  - by Milan Babuškov

  I have Apache 2.2.4 server with a lot of messages like this in the access_log: ::1 - - [15/May/2010:19:55:01 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:22:17 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:24:58 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:25:55 +0200] "OPTIONS * HTTP/1.0" 400 543 ::1 - - [15/May/2010:20:27:14 +0200] "OPTIONS * HTTP/1.0" 400 543 These are the "internal dummy connections" as explained on this page: http://wiki.apache.org/httpd/InternalDummyConnection The page also hits my main problem: "In 2.2.6 and earlier, in certain configurations, these requests may hit a heavy-weight dynamic web page and cause unnecessary load on the server. You can avoid this by using mod_rewrite to respond with a redirect when accessed with that specific User-Agent or IP address." Well, obviously I cannot use UserAgent because I minimized the server signature, but I could use IP address. However, I don't have a clue what should the RewriteCond and RewriteRule look for IPv6 address ::1. The website where this runs is using CodeIgniter, so there is already the following .htaccess in place, I just need to add to it: RewriteEngine on RewriteCond %{REQUEST_URI} ^/system.* RewriteRule ^(.*)$ /index.php?/$1 [G] RewriteCond %{REQUEST_FILENAME} !-f RewriteCond %{REQUEST_FILENAME} !-d RewriteRule ^(.*)$ /index.php?/$1 [L] Any idea how to write this .htaccess rule?

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• How do I create a "here document" within a shell function?

  - by BenU

  I'm working my way through William Shotts Jr.'s great The Linux Command Line on my Mac OSX 10.7.5 system. 90% of the linux that Shotts covers is close enough to Darwin that I can figure out or GTEM to figure out what's going on. I've made it to chapter 27 on "Writing Shell Scripts" and am getting hung up creating "here files" within a function. I get an syntax error: unexpected end of file error when I include the following function: report_uptime () { cat <<- _EOF_ <H2>System Uptime</H2> <PRE>$(uptime)</PRE> _EOF_ return } The error goes away if I use the following function placeholder: report_uptime () { return } Also, elsewhere in the script, outside of a function I use the cat << _EOF_ format to create a "here file" with no trouble: cat << _EOF_ <HTML> <HEAD> <TITLE>$TITLE</TITLE> </HEAD> <BODY> <H1>$TITLE</H1> <P>$TIME_STAMP</P> $(report_uptime) $(report_disk_space) $(report_home_space) </BODY> </HTML> _EOF_ If anyone has any idea what I'm doing wrong I would be grateful!

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• SFTP ChRoot result in broken pipe

  - by Patrick Pruneau

  I have a website that I want to add some restricted access to a sub-folder. For this, I've decided to use CHROOT with SFTP (I mostly followed this link : http://shapeshed.com/chroot_sftp_users_on_ubuntu_intrepid/) For now, I've created a user (sio2104) and a group (magento).After following the guide, my folder list look like this : -rw-r--r-- 1 root root 27 2012-02-01 14:23 index.html -rw-r--r-- 1 root root 21 2012-02-01 14:24 info.php drwx------ 15 root root 4096 2012-02-25 00:31 magento As you can see, i've chown root:root the folder magento I wanted to jail-in the user and ...everything else by the way. Also in the magento folder, I chown sio2104:magento everything so they can access what they want. Finally, I've added this to sshd_config file : #Subsystem sftp /usr/lib/openssh/sftp-server Subsystem sftp internal-sftp Match Group magento ChrootDirectory /usr/share/nginx/www/magento ForceCommand internal-sftp AllowTCPForwarding no X11Forwarding no PasswordAuthentication yes #UsePAM yes And the result is...well, I can enter my login, password and it's all finished with a "broken pipe" error. $ sftp [email protected] [....some debug....] [email protected]'s password: debug1: Authentication succeeded (password). Authenticated to 10.20.0.50 ([10.20.0.50]:22). debug1: channel 0: new [client-session] debug1: Requesting [email protected] debug1: Entering interactive session. Write failed: Broken pipe Connection closed Verbose mode gives nothing to help. Anyone have an idea of what I've done wrong? If I try to login with ssh or sftp with my personnal user, everything works fine.

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• Google Chrome doesn't delete my browsing history correctly

  - by Derfder

  I have deleted everything that I could from my browser history: chrome://settings/clearBrowserData I checked everything and select the begining of time Then when I access browsing history: chrome://history/ There is nothing (as I expected), or to be precise No history entries found. The problem is that I still see my specific search url with very specific query I have made a month ago, when I start typing the url of the website into chrome address bar. How is that possible? Where is Google stroing these data. How to get rid off them completely? I want to mention that my autosuggestion options look like this: So, what else should I delete to remove everything from autosuggestions? Right now it has some specific URLs (subpages, pages with very specific search query I have made in a month or so). I have tried restarting Chrome and restarting my computer, but the urls are still in the autosuggestion. Also I am unable to turn off the autosuggestion, even I have unchecked that option in settings. My Google Chrome version is: Version 27.0.1453.116 m (probably the latest) Btw. in Firefox deleting the history works as expected. So, I guess that this has nothing to do with the operating system I am using (Windows 7), but only it's an issue with Chrome itself.

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• Building a PC for Work and play? [closed]

  - by Derek Organ

  Ok, Its been a long time since I build my own PC so I'm looking to get back into it again and build a new one. First off budget is about €800 excluding the monitor and windows 7 licence and mouse. (just bought a new g500) I plan on using my computer for work, lots of applications open at once but none particularly excessive (photoshop being the most demanding, mostly coding tools) I also use it for some gaming, e.g. COD, Starcraft etc. One thing I do want to do eventually is get a really good monitor with hight resolution and maybe 27" so the graphics card needs to be able to make best use of that. So a few questions 1) Is the bottle neck in performance mostly still the harddrives? 2) Aren't most processors e.g. i5 etc even i3 so far a head of other bottlenecks it makes litte difference the higher you go. Isn't the Graphics card dealing with heavy graphics so what really slows because of a slow CPU? So from this my thinking is to get a SSD drive as my primary drive for OS etc and have loads of memory e.g. 6-8GB and a decent mid level graphics card? It doesn't seem at my level worth spending much on CPU and any other parts really. I basic parts off the top of my head Case, Motherboard CPU SSD Drive SATA Drive Power Supply Memory Cooling (fan?) Graphics Card Network Card Keyboard DVD drive Mouse Windows Monitor Am I missing anything? Any helpful tips or general education much appreciated. Thanks, Derek

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• VPN - local and remote networks IP collision

  - by Guido García

  I have created a VPN connection in Windows using the New Network Connection wizard that comes with Windows. It works without problems in most places, but there is one concrete place where, despite the connection to the remote public IP works fine, it is not able to validate the login/password and establish the VPN connection. In this place, the network is 10.0.0.x (the same I use in other places where I am able to connect). The remote network is 192.168.x.x, so I suspect there is some kind of IP collision, because before connecting, a traceroute to i.e. 192.168.0.40 does not fail. 1 4 ms 1 ms 1 ms LINKSYS [10.0.0.1] 2 5 ms 1 ms 1 ms 172.26.27.1 3 4 ms 5 ms 3 ms 192.168.1.100 ... (more) I can't modify the local network further than the first router (10.0.0.1). That is the only different I've found so far. Any idea about how to solve it? Thank you.

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• Problems installing MySQL-python via yum / missing dependency / incompatibility problem?

  - by bs0

  I have come up against problems installing MySQL-python via yum. Our server is running Centos 5.5 and MySQL Version 5.1.45, Python-dev is installed. Yum complains about the missing dependency libmysqlclient_r.so.15: Missing Dependency: libmysqlclient_r.so.15()(64bit) is needed by package MySQL-python-1.2.1-1.x86_64 (base) The server is up to date and the packages mysql mysql-devel python-devel are installed. The missing dependency is nowhere on the system: locate libmysqlclient /usr/lib64/libmysqlclient.so /usr/lib64/libmysqlclient.so.15 /usr/lib64/libmysqlclient.so.16 /usr/lib64/libmysqlclient.so.16.0.0 /usr/lib64/libmysqlclient_r.so /usr/lib64/libmysqlclient_r.so.16 /usr/lib64/libmysqlclient_r.so.16.0.0 /usr/lib64/mysql/libmysqlclient.a /usr/lib64/mysql/libmysqlclient.la /usr/lib64/mysql/libmysqlclient.so /usr/lib64/mysql/libmysqlclient_r.a /usr/lib64/mysql/libmysqlclient_r.la /usr/lib64/mysql/libmysqlclient_r.so /usr/local/cpanel/lib64/libmysqlclient.so.14 rpm -qa | grep -i mysql MySQL-devel-5.1.45-0.glibc23 MySQL-bench-5.0.89-0.glibc23 MySQL-shared-5.1.45-0.glibc23 MySQL-server-5.1.45-0.glibc23 MySQL-test-5.1.45-0.glibc23 MySQL-client-5.1.45-0.glibc23 The Python version is python-2.4.3-27.el5.x86_64: Python 2.4.3 (#1, Sep 3 2009, 15:37:37) [GCC 4.1.2 20080704 (Red Hat 4.1.2-46)] on linux2 Any suggestions would be greatly appreciated.

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• Wireless disconnects at random after upgrade to Ubuntu 10.4

  - by Daniel Elessedil Kjeserud

  After upgrading my home server from Ubuntu 8.10 to 10.4 my wireless seemingly drops out, even though my IRC client keeps it's connection to the servers, so it looks like the machine just stops taking wireless requests. A ping will give a me this Request timeout for icmp_seq 27 ping: sendto: Host is down After a while the machine just starts responding again, without any interaction from me. When the machine comes back, this is what dmesg gives me [ 18.296288] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.296350] wlan0: deauthenticating from 00:1b:63:22:a4:5f by local choice (reason=3) [ 18.296440] wlan0: direct probe to AP 00:1b:63:22:a4:5f (try 1) [ 18.298697] wlan0: direct probe responded [ 18.298706] wlan0: authenticate with AP 00:1b:63:22:a4:5f (try 1) [ 18.306836] wlan0: authenticated [ 18.306886] wlan0: associate with AP 00:1b:63:22:a4:5f (try 1) [ 18.309396] wlan0: RX AssocResp from 00:1b:63:22:a4:5f (capab=0x411 status=0 aid=2) [ 18.309402] wlan0: associated [ 18.310187] ADDRCONF(NETDEV_CHANGE): wlan0: link becomes ready [ 18.447742] apm: BIOS version 1.2 Flags 0x03 (Driver version 1.16ac) [ 18.447748] apm: overridden by ACPI. [ 19.163282] padlock: VIA PadLock not detected. [ 28.352022] wlan0: no IPv6 routers present kjes@brin:~$ lspci 02:07.0 Network controller: RaLink RT2561/RT61 rev B 802.11g It's on a wireless network with WPA2, the machine worked without any problems on the same wireless network since Ubuntu 8.10 was the most resent version, and there have been no changes to my network recently. Even though the server drops out, everything else on the network keeps working like normal.

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• High apache load but zero traffic

  - by Adie

  I have a problem with new server.. I use VPS Centos with 1GB of ram and I use wordpress CMS. The traffic <100 visitor/hour, but the apache have high load and make the server hang with zero free of ram and can't connect through ssh. I should reboot the vps to make it works here is the load on Apache looks like Tasks: 66 total, 1 running, 65 sleeping, 0 stopped, 0 zombie Cpu(s): 1.6%us, 12.3%sy, 0.0%ni, 48.1%id, 23.0%wa, 4.8%hi, 10.2%si, 0.0% Mem: 1018776k total, 116620k used, 902156k free, 1236k buffers Swap: 1048568k total, 1013052k used, 35516k free, 26628k cached 2949 apache 20 0 459m 42m 3732 D 3.0 4.2 0:09.23 httpd 2959 apache 20 0 460m 29m 3744 D 2.0 3.0 0:02.72 httpd 2968 apache 20 0 460m 26m 3808 D 2.0 2.6 0:02.27 httpd 2972 apache 20 0 460m 24m 3784 D 2.0 2.5 0:02.44 httpd 2986 apache 20 0 460m 29m 3784 R 2.0 2.9 0:02.40 httpd 2969 apache 20 0 458m 29m 3864 D 1.6 3.0 0:02.63 httpd 2974 apache 20 0 460m 25m 3820 D 1.6 2.6 0:02.43 httpd 2990 apache 20 0 460m 23m 3920 D 1.6 2.4 0:02.36 httpd 2994 apache 20 0 460m 31m 3756 D 1.6 3.2 0:02.62 httpd 2956 apache 20 0 460m 26m 3740 D 1.3 2.7 0:02.73 httpd 2957 apache 20 0 465m 22m 3644 D 1.3 2.3 0:02.80 httpd 2967 apache 20 0 458m 24m 3764 D 1.3 2.5 0:02.60 httpd 2970 apache 20 0 463m 25m 3764 D 1.3 2.6 0:03.07 httpd 2971 apache 20 0 451m 22m 3792 D 1.3 2.3 0:02.47 httpd 2973 apache 20 0 458m 25m 3768 D 1.3 2.6 0:02.52 httpd 2987 apache 20 0 465m 20m 3772 D 1.3 2.1 0:03.02 httpd But sometimes the server have uptime more than 5-10hrs but after that the problems start

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• ESXi - change to thin - virtual disk filesize is the same

  - by sven

  running ESXi 5.5 here with a datastore on a single SSD. Now, I thought about changing to thin disks from thick and found that I could use a tool on the ESXi host to do that. However, the file size of the new created virtual disk is not changing. I run: vmkfstools -i loader.vmdk -d 'thin' thinloader.vmdk Destination disk format: VMFS thin-provisioned Cloning disk 'loader.vmdk'... Clone: 100% done. After that I compared the virtual disksizes: ls -la *.vmdk -rw------- 1 root root 32212254720 Jun 10 08:25 loader-flat.vmdk -rw------- 1 root root 467 May 21 17:04 loader.vmdk -rw------- 1 root root 32212254720 Jun 10 08:27 thinloader-flat.vmdk -rw------- 1 root root 520 Jun 10 08:33 thinloader.vmdk Stats on the original file: stat loader.vmdk File: loader.vmdk Size: 467 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 419443780 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-01-25 10:17:34.000000000 Modify: 2014-05-21 17:04:06.000000000 Change: 2014-05-21 17:04:06.000000000 and on the thin file: stat thinloader.vmdk File: thinloader.vmdk Size: 520 Blocks: 0 IO Block: 131072 regular file Device: 8bf64d175e27544ch/10085333178302026828d Inode: 432026692 Links: 1 Access: (0600/-rw-------) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2014-06-10 08:27:45.000000000 Modify: 2014-06-10 08:33:30.000000000 Change: 2014-06-10 08:33:30.000000000 Anyone an idea why the disk is not providing any more space (tried with multiple VM's already - all the same)? Also, I have noticed that the newly created file "autoappend" "-flat" to the disk ... Thanks Sven Update - diff of the vmdk config* --- loader.vmdk +++ thinloader.vmdk @@ -7,15 +7,17 @@ createType="vmfs" -RW 62914560 VMFS "loader-flat.vmdk" +RW 62914560 VMFS "thinloader-flat.vmdk" ddb.adapterType = "lsilogic" +ddb.deletable = "true" ddb.geometry.cylinders = "3916" ddb.geometry.heads = "255" ddb.geometry.sectors = "63" ddb.longContentID = "6d95855805dfa0079327dfee29b48dca" -ddb.uuid = "60 00 C2 98 d5 7d 17 bf-ac 54 70 b1 2d 39 43 d5" +ddb.thinProvisioned = "1" +ddb.uuid = "60 00 C2 93 c4 13 6c cf-bb 7b 34 c9 2c b4 dc 1e" ddb.virtualHWVersion = "8"

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• Divide pivot table data by an arbitrary column in another table

  - by rsavu

  Hello all, I have this data from a pivot table: Countries P1 P2 Total Country 1 10 69 Country 2 36 2 92 Country 3 21 24 100 Country 4 22 77 Country 5 13 79 Country 6 12 1 48 Country 7 14 29 Country 8 22 1 46 Country 9 4 1 31 Country 10 16 7 120 Country 11 25 2 114 Country 12 8 11 68 Country 13 5 27 Country 14 11 3 23 Country 15 6 19 Country 16 33 79 Where: 1st column is the country name 2nd and 3rd column are the tickets introduced in the system 4th column is the total (disregard the data - total is not accurate) Additionally, I have another table that looks like this: Country P1 P2 Country 1 2 3 Country 2 2 2 Country 3 0 2 Country 4 0 3 Country 5 1 1 Country 6 2 2 Country 7 1 2 Country 8 3 3 Country 9 1 4 Country 10 2 1 Country 11 4 2 Country 12 2 1 Country 13 3 2 Country 14 3 3 Country 15 1 2 Country 16 2 2 Where the data represents the number of users of the application in each country. I want to be able to show the number of tickets submitted divided by the number of users in each country. Any ideeas how to do that? Thank you very much, Razvan

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• install zenoss on ubuntu, raise No valid ZENHOME error

  - by bxshi

  I've added an user with name zenoss, and set export ZENHOME=/usr/local/zenoss in ~/.bashrc under /home/zenoss, and when using echo $ZENHOME, it could show /usr/local/zenoss When install zenoss, I switched to zenoss and then run install.sh under zenoss-4.2.0/inst, when it tries to run Tests, the error occured. ------------------------------------------------------- T E S T S ------------------------------------------------------- Running org.zenoss.utils.ZenPacksTest Tests run: 3, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 0.045 sec <<< FAILURE! Running org.zenoss.utils.ZenossTest Tests run: 3, Failures: 0, Errors: 0, Skipped: 0, Time elapsed: 0.71 sec Results : Tests in error: testGetZenPack(org.zenoss.utils.ZenPacksTest): No valid ZENHOME could be found. testGetPackPath(org.zenoss.utils.ZenPacksTest): No valid ZENHOME could be found. testGetAllPacks(org.zenoss.utils.ZenPacksTest): No valid ZENHOME could be found. Tests run: 6, Failures: 0, Errors: 3, Skipped: 0 [INFO] ------------------------------------------------------------------------ [INFO] Reactor Summary: [INFO] [INFO] Zenoss Core ....................................... SUCCESS [27.643s] [INFO] Zenoss Core Utilities ............................. FAILURE [12.742s] [INFO] Zenoss Jython Distribution ........................ SKIPPED [INFO] ------------------------------------------------------------------------ [INFO] BUILD FAILURE [INFO] ------------------------------------------------------------------------ [INFO] Total time: 40.586s [INFO] Finished at: Wed Sep 26 15:39:24 CST 2012 [INFO] Final Memory: 16M/60M [INFO] ------------------------------------------------------------------------ [ERROR] Failed to execute goal org.apache.maven.plugins:maven-surefire-plugin:2.8:test (default-test) on project utils: There are test failures. [ERROR] [ERROR] Please refer to /home/zenoss/zenoss-4.2.0/inst/build/java/java/zenoss-utils/target/surefire-reports for the individual test results.

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• Process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process sending out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome.

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• Performance degrades for more than 2 threads on Xeon X5355

  - by zoolii

  Hi All, I am writing an application using boost threads and using boost barriers to synchronize the threads. I have two machines to test the application. Machine 1 is a core2 duo (T8300) cpu machine (windows XP professional - 4GB RAM) where I am getting following performance figures : Number of threads :1 , TPS :21 Number of threads :2 , TPS :35 (66 % improvement) further increase in number of threads decreases the TPS but that is understandable as the machine has only two cores. Machine 2 is a 2 quad core ( Xeon X5355) cpu machine (windows 2003 server with 4GB RAM) and has 8 effective cores. Number of threads :1 , TPS :21 Number of threads :2 , TPS :27 (28 % improvement) Number of threads :4 , TPS :25 Number of threads :8 , TPS :24 As you can see, performance is degrading after 2 threads (though it has 8 cores). If the program has some bottle neck , then for 2 thread also it should have degraded. Any idea? , Explanations ? , Does the OS has some role in performance ? - It seems like the Core2duo (2.4GHz) scales better than Xeon X5355 (2.66GHz) though it has better clock speed. Thank you -Zoolii

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• How can I recover my system after running 'mkfs' on the system partition?

  - by Filip Podgórny

  I am not a Linux user, and was doing some homework, I blindly typed sudo mkfs ext3 dev/sda2 (I had Ubuntu as Windows installation). I've done few more things, and turned Ubuntu off to switch on Windows back. No operating system installed - this is the message I'm getting. I plugged my HDD onto another computer and all my files are still there. What should I do to get my windows installation back? df -l (before mkfs) /dev/loop0 29G 2,0G 27G 8% / udev 3,0G 4,0K 3,0G 1% /dev tmpfs 1,2G 900K 1,2G 1% /run none 5,0M 0 5,0M 0% /run/lock none 3,0G 1,3M 3,0G 1% /run/shm /dev/sda3 455G 123G 333G 27% /host /dev/sdb1 1,9G 820M 1,1G 43% /media/PHONE CARD mkfs output (polish, sorry) mke2fs 1.41.14 (22-Dec-2010) Etykieta systemu plików= Typ OS: Linux Rozmiar bloku=1024 (log=0) Rozmiar fragmentu=1024 (log=0) Stride=0 bloków, szerokosc Stripe=0 bloków 25688 i-wezlów, 102400 bloków 5120 bloków (5.00%) zarezerwowanych dla superuzytkownika Pierwszy blok danych=1 Maksymalna liczba bloków systemu plików=67371008 13 grup bloków 8192 bloków w grupie, 8192 fragmentów w grupie 1976 i-wezlów w grupie Kopie zapasowe superbloku zapisane w blokach: 8193, 24577, 40961, 57345, 73729 Zapis tablicy i-wezlów: zakonczono Tworzenie kroniki (4096 bloków): wykonano Zapis superbloków i podsumowania systemu plików: wykonano Ten system plików bedzie automatycznie sprawdzany co kazde 30 montowan lub co 180 dni, zaleznie co nastapi pierwsze. Mozna to zmienic poprzez tune2fs -c lub -i.

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• Why do fonts sometimes look "fat" on Mac OS X?

  - by jtimberman

  Sometimes when resuming from suspend, the fonts in Mac OS X look "fatter" than normal. Unfortunately right now I can't get my Macbook Pro to exhibit the "normal" behavior for comparison, it has been abnormal yesterday and today. If I can get screenshots of what I think is 'normal', I'll add them. "Fixing" this has been random. I use an external monitor, and sometimes unplugging it and plugging back in, or even turning it off and back on has worked. Sometimes with the display attached (or not) detecting displays works. Sometimes logging out or rebooting entirely is what it takes. Displays used: Macbook Pro 15" built-in display Dell 27" LCD (2009 model) Software where I see this happen, at least most noticably: Firefox (screenshots below) iTerm Things MacIrssi (screenshots below) I am using Mac OS X 10.5.8. "Abnormal" view from MacIrssi with Inconsolata 16 pt. image full size "Abnormal" view from Firefox. Finally got it to switch back, though after resuming from suspend its back to "fat" :-(. image full size And 'normal' in Firefox:

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• Windows 8 Doesn't Shutdown Properly With Fast Start-Up Enabled

  - by Patrick

  While Fast start-up is enabled, on turning the computer off (shutdown) the computer idles for about 5min after logging out/screen turning off. It then turns off. On returning into Windows I receive the error message saying Windows didn't shut down properly. Hibernate works fine, and I am told this shouldn't be the case - If one doesn't work, neither should. It works when both Fast start-up is enabled and disabled, as does restart and sleep. Windows is installed under UEFI. The UEFI ultra fast boot option for my motherboard cannot be enabled as my GPU doesn't support some UEFI GOP tech. As far as I know, not related to windows fast start-up, but thought it was worth mentioning. To clarify, if this: http://www.eightforums.com/tutorials/6320-fast-startup-turn-off-windows-8-a.html is enabled, the computer does not shut down properly. EDIT: Some more information on the matter: Formatting didn't fix the issue. Still fails regardless of drivers installed. Hardware was purchased ~6months ago. Running a good SSD. Event viewer Always these two messages in close succession: Error (event ID 6008): The previous system shutdown at 7:45:21 PM on ?27/?10/?2012 was unexpected. Critical (kernel power, event ID 41): The system has rebooted without cleanly shutting down first. This error could be caused if the system stopped responding, crashed, or lost power unexpectedly. Upon installing WPT as suggested below to figure out what was happening during shutdown, and running the cmd xbootmgr -trace shutdown -noPrepReboot -traceFlags BASE+CSWITCH+DRIVERS+POWER -resultPath C:\TEMP Windows fast start-up is now working consistently. Still works upon uninstalling WPT. This is the only change to occur on the computer. Nothing else has bee installed/uninstalled, no Windows Updates, nothing. Windows fast start-up did not work prior to installing WPT and running the cmd (made sure I tested).

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• wget hangs in http request sent awaiting response in some sites

  - by gkr

  Using Ubuntu 12.04. wget hangs in http request sent, awaiting response... in some sites. Browser's are not opening sites that are failed in wget. But in WinXP everything works. This works gkr@gkr-desktop:~/Documents/curl$ wget google.com --2012-06-12 21:29:37-- http://google.com/ Resolving google.com (google.com)... 74.125.236.174, 74.125.236.160, 74.125.236.161, ... Connecting to google.com (google.com)|74.125.236.174|:80... connected. HTTP request sent, awaiting response... 301 Moved Permanently Location: http://www.google.com/ [following] --2012-06-12 21:29:38-- http://www.google.com/ Resolving www.google.com (www.google.com)... 74.125.236.179, 74.125.236.180, 74.125.236.176, ... Connecting to www.google.com (www.google.com)|74.125.236.179|:80... connected. HTTP request sent, awaiting response... 302 Found Location: http://www.google.co.in/ [following] --2012-06-12 21:29:38-- http://www.google.co.in/ Resolving www.google.co.in (www.google.co.in)... 74.125.236.184, 74.125.236.191, 74.125.236.183, ... Connecting to www.google.co.in (www.google.co.in)|74.125.236.184|:80... connected. HTTP request sent, awaiting response... 200 OK Length: unspecified [text/html] Saving to: `index.html.3' [ ] 13,383 --.-K/s in 0.04s 2012-06-12 21:29:39 (308 KB/s) - `index.html.3' saved [13383] gkr@gkr-desktop:~/Documents/curl$ This site just stops/hangs in awaiting response. gkr@gkr-desktop:~/Documents/curl$ wget grooveshark.com --2012-06-12 21:27:29-- http://grooveshark.com/ Resolving grooveshark.com (grooveshark.com)... 8.20.213.76 Connecting to grooveshark.com (grooveshark.com)|8.20.213.76|:80... connected. HTTP request sent, awaiting response... ^C gkr@gkr-desktop:~/Documents/curl$ Thanks

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• Some process does ICMP port scan on my OSX box and I am afraid my Mac got a virus

  - by Jamgold

  I noticed that my 10.6.6 box has some process send out ICMP messages to "random" hosts, which concerns me a lot. when doing a tcpdump icmp I see a lot of the following 15:41:14.738328 IP macpro > bzq-109-66-184-49.red.bezeqint.net: ICMP macpro udp port websm unreachable, length 36 15:41:15.110381 IP macpro > 99-110-211-191.lightspeed.sntcca.sbcglobal.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:23.458831 IP macpro > 188.122.242.115: ICMP macpro udp port websm unreachable, length 36 15:41:23.638731 IP macpro > 61.85-200-21.bkkb.no: ICMP macpro udp port websm unreachable, length 36 15:41:27.329981 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 15:41:29.349586 IP macpro > c-98-234-88-192.hsd1.ca.comcast.net: ICMP macpro udp port 54045 unreachable, length 36 I got suspicious when my router notified me about a lot of ICMP messages that don't get a response [INFO] Mon Jan 10 16:31:47 2011 Blocked outgoing ICMP packet (ICMP type 3) from 192.168.1.189 to 212.25.57.90 Does anyone know how to trace which process (or worse kernel module) might be responsible for this? I rebooted and logged in with a virgin user account and tcpdump showed the same results. Any dtrace magic welcome. Thanks in advance

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• How to unblacklist an IP at Google?

  - by DJRayon

  I own a small business with two servers for webhosting. When setting up the primary (CentOS 5.5 + WHM, secondary is WHM DNS Only) server I kinda messed up the firewall, so the hackers could send stuff from my server. My primary IP is x.y.29.218. Anyway - I got blacklisted in several places, but now those blacklistings are gone. For a week or so, but Google still has my IP blacklisted. I handling serious damages because of that. Many clients want to switch from my hosting, etc. I've fixed the hole with CSF firewall SMTP_BLOCK option and enabled also the WHM SMTP TEAK Currently all I see from the Main Email View Mail Statistics (Errors section) in WHM is rows and rows of the following message removed-the-email-address-for-security R=lookuphost T=remote_smtp: SMTP error from remote mail server after end of data: host aspmx.l.google.com [a.b.39.27]: 550-5.7.1 [x.y.29.218 1] Our system has detected an unusual rate of\n550-5.7.1 unsolicited mail originating from your IP address. To protect our\n550-5.7.1 users from spam, mail sent from your IP address has been blocked.\n550-5.7.1 Please visit http://www.google.com/mail/help/bulk_mail.html to review\n550 5.7.1 our Bulk Email Senders Guidelines. h24si3868764fas.171 What are my options? I have one IP free. How can I configure Exim to send mail from that IP? My brain is like constantly blowing up because of this problem. Please someone, who has any knowledge how to deal with the current situation, please give me some kind of help - any help, suggestions, etc. I've tried everything I know, and I still don't know much, because this is the first time (I just started to webhost, etc) I deal with real physical servers not some kind of pre-setup VPS solution. Many - many thanks, whoever has time to offer some help.

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• Sending email with exim and external sender address

  - by Tronic

  i have following problem: i want to send emails with an rails webapp. i set up an exim server and when looking into the logs, the sending works, but the emails aren't sent really. i had the same problem with another isp. the sender address is hosted on another mailserver, other isp. i think the problem is, that sending doesn't work because the sener address isn't hosted on the same server. do you have any advice on this? the logs (exim) tell me the following: 2011-01-01 14:38:06 1PZ1eo-0000Ga-38 <= <> R=1PZ1eo-0000GY-1p U=Debian-exim P=local S=1778 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.131] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 14:38:08 1PZ1eo-0000Ga-38 Completed [email protected] is the external sender-address! thank you! Edit with more details when sending a mail from command line with echo "Test" | mail -s Testmail [email protected] the logs says 2011-01-01 20:45:24 1PZ7OG-0001Vp-Rx <= root@gustav U=root P=local S=360 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx => [email protected] R=dnslookup T=remote_smtp H=gmail-smtp-in.l.google.com [209.85.229.27] X=TLS1.0:RSA_ARCFOUR_MD5:16 DN="C=US,ST=California,L=Mountain View,O=Google Inc,CN=mx.google.com" 2011-01-01 20:45:26 1PZ7OG-0001Vp-Rx Completed and i get the mail on my gmail account. but when sending by webapp (when testing locally with sendmail it works fine) i only get this log output 2011-01-01 20:50:08 1PZ7Sq-0001X9-L4 <= <> R=1PZ7Sq-0001X7-Jo U=Debian-exim P=local S=1780 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 => [email protected] R=dnslookup T=remote_smtp H=mx1.emailsrvr.com [98.129.184.3] X=TLS1.0:RSA_AES_256_CBC_SHA1:32 DN="C=US,O=mx1.emailsrvr.com,OU=GT21850092,OU=See www.geotrust.com/resources/cps (c)08,OU=Domain Control Validated - QuickSSL(R),CN=mx1.emailsrvr.com" 2011-01-01 20:50:11 1PZ7Sq-0001X9-L4 Completed

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• How to allow writing to a mounted NFS partition

  - by Cerin

  How do you allow a specific user permission to write to an NFS partition? I've mounted an NFS share on my localhost (a Fedora install), and I can read and write as root, but I'm unable to write as the apache user, even though all the files and directories in the share on my localhost and remote host are owned by apache. For example, I've mounted it via this line in my /etc/fstab: remotehost:/data/media /data/media nfs _netdev,soft,intr,rw,bg 0 0 And both locations are owned by apache: [root@remotehost ~]# ls -la /data total 24 drwxr-xr-x. 6 root root 4096 Jan 6 2011 . dr-xr-xr-x. 28 root root 4096 Oct 31 2011 .. drwxr-xr-x 4 apache apache 4096 Jan 14 2011 media [root@localhost ~]# ls -la /data total 16 drwxr-xr-x 4 apache apache 4096 Dec 7 2011 . dr-xr-xr-x. 27 root root 4096 Jun 11 15:51 .. drwxrwxrwx 5 apache apache 4096 Jan 31 2011 media However, when I try and write as the apache user, I get a "Permission denied" error. [root@localhost ~]# sudo -u apache touch /data/media/test.txt' touch: cannot touch `/data/media/test.txt': Permission denied But of course it works fine as root. What am I doing wrong?

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