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  • How to calculate RAM value on performance per dollar spent

    - by Stucko
    Hi, I'm trying to make decisions on buying a new PC. I have most specifications (processor/graphic card/hard disk) pin-downed except for RAM. I am wondering what is the best RAM configuration for the amount of money I'm spending. As the question of best is subjective, I'd like to know how would I calculate the value of RAM sticks sold. 1.(sample)The value of amount of memory: 1) CORSAIR PC1333 D3 2GB = costs $80 2) CORSAIR PC1333 D3 4GB = costs $190 would it be better to buy 2 of item 1) instead of 1 of item 2) ?? Although I would normally choose to have 1 of 2) as the difference is only (190-(80*2)) = 30 as I would save 1 DIMM slot, What I need is the value per amount: 1) 80/ 2 = $40 per 1GB 2) 190/ 4 = $47.5 per 1GB 2. The value of frequency: 1) CORSAIR PC1333 4GB = costs 190 2) CORSAIR PC1600C7 4GB = costs 325 Im not even sure of the denominator ... $ per 1 ghz speed? 3. The value of latency: 1) CORSAIR CMP1600C8 8-8-8-24 2GBx3 (triple channel) = costs 589 2) CORSAIR CMP1600C7D 7-7-7-20 2GBx3 (triple channel) = costs 880 Im not even sure of the denominator ... $ per 1 ghz speed? Just for your information i'd like to get the best out of the money im going to spend to put on a 6 DIMM slot i7core motherboard.

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  • Best way to attach 96 tb to workstation

    - by user994179
    I'm running a workstation with dual xeon 5690's (12 physical/24 logical cores), 192 gb of ram (ie, maxed-out), Windows 7 64bit, 5 slots for adapter cards, and 1 tb of internal storage, with 5 more internal bays available. I have an app that creates data files totaling about 88 tbs. These are written once every 14 months, and the rest of the time the app only needs to read them; and 95% of the reads are sequential reads of huge chunks of data. I have some control over how big the individual files are, but ideally they would be between 5 and 8 tbs. The app will be reading from only one drive at a time, and the nature of the data is such that if (when) a drive dies I can restore the data to a new disk from tape. While it would be nice to be able to use the fastest drive/controllers available, at this point size matters more than speed. After doing lots of reading, I am leaning toward buying a bunch of cheap 2tb drives and putting them into a bunch of cheap enclosures. All this stuff is going into my home office, so I need to avoid the raised floor/refrigerated approach. My questions: Is the cheap drive/enclosure solution the best one for this situation? Given the nature of the app and the way the data is used, does RAID make sense? If so, which one? For huge sequential reads, would Usb 3.0 and eSata be a wash performance-wise? For each slot available on the workstation, can I hook up an enclosure that can hold multiple drives? Or is it one controller per drive? If I can have multiple drives on one controller, am I essentially splitting the bandwidth (throughput)? For example, if I have a 12 bay enclosure, is the throughput of the controller reduced by a factor of 12? Are there any Windows 7 volume/drive/capacity limits I should be aware of? Thanks

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  • Cable management techniques

    - by cornjuliox
    How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). How do large offices and data centers manage their masses of cable?

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  • Cable management techniques

    - by cornjuliox
    How do you manage the giant jungle of cables behind your PC? When you have 2 or more PCs next to each other, you wind up with this giant mess cables that's a pain in the neck to clean especially when both computers are running 24/7 and any fidgeting with the cables is likely to cause data loss and/or angry users. So far I've tried masking tape, cable ties and plain old string but none have been very effective. The masking tape kept the cables in place, but over time they ended up leaving this awful sticky residue on the sides of the cables that just won't come off gets all over your fingers and is horrible horrible horrible. I have nightmares about that stuff. We used cable ties and 'folded' up some of the longer cables so that they weren't any longer than they needed to be, but this meant that the position of some of our devices like the keyboard and the mouse were essentially 'fixed' until we removed the ties. The string didn't work much differently and required that we tie them properly or risk it coming loose. I would switch to a wireless keyboard and mouse, but I don't want to have to deal with the added expense of batteries, even the rechargable ones. Plus I don't want them to die on me at a crucial moment (happened to me once while playing Firearms _<). I know that there are people out there with home/office networks a thousand times more convoluted than mine, so

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  • How can I configure apache to cache the images that it is serving? Right now it is giving headers t

    - by Tchalvak
    Serving up images that don't seem to cache There's a LAPP (postgresql instead of mysql) running over on http://ninjawars.net. I just recently noticed that images don't seem to be caching with any kind of good frequency as I was reloading a page with a few images on it here: http://www.ninjawars.net/attack_player.php Here is an example image (they're probably all being served exactly the same): http://www.ninjawars.net/images/characters/fighter.png Checking the header, it seems that the caching is set to: Cache-Control:max-age=0 (the full header for this image-like-all-the-others is... Request URL:http://www.ninjawars.net/images/characters/fighter.png Request Method:GET Status Code:200 OK Request Headers Accept:application/xml,application/xhtml+xml,text/html;q=0.9,text/plain;q=0.8,image/png,/;q=0.5 Cache-Control:max-age=0 Referer:http://www.ninjawars.net/images/characters/fighter.png User-Agent:Mozilla/5.0 (X11; U; Linux x86_64; en-US) AppleWebKit/533.4 (KHTML, like Gecko) Chrome/5.0.375.3 Safari/533.4 Response Headers Accept-Ranges:bytes Content-Length:938 Content-Type:image/png Date:Thu, 13 May 2010 21:24:07 GMT ETag:"ffd4d-3aa-4837efc120540" Last-Modified:Mon, 05 Apr 2010 15:28:45 GMT Server:Apache ) So what modules or config or htaccess or whatever do I change to have it cache images, e.g. for 24 hours?

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  • 5GHz vs 2.4GHz dual band router, max mbps

    - by Tallboy
    I've done a fair amount of reading before posting this but there are a few things still unclear. I just bought a Netgear WNDR3700 N600. I understand that 5GHz offers more channels, less interference because of more available channels, wont interfere with a microwave and so on, and also has a shorter range. Currently, my router is broadcasting both signals (for my iPhone on 2.4, and my computer on 5) But my question is What is the max speed of 5GHz in mbps? In the router settings, it allows me to set '300mbps', but I keep reading online that the max is 54. Is this true? I noticed when I set up the router the default for 2.4 was set to 300 and the default for 5 was set to 54, so I changed both to 300. Is this fine as well? I don't see why it wouldn't be maxed out for both by default. On the box it says max rate of 300+300 so I assume this is correct, but it's throttled down so the router isn't stressing in case you have something streaming media 24/7 and slowing the internet down too. What is the max range of 5GHz? my apt is 780 square feet, and the router is in the main living room.

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  • ESX hosts lose connectivity with iSCSI SAN LUNs

    - by Themist
    I've been experiencing this issue for a couple of months now where my ESX hosts lose connectivity with my iSCSI SAN vmfs volumes. As a results the ESX hosts enter a nonresponsive mode the associated VMs disconnect and the only remedy is to reboot the host. This issue happens randomly . I have escalated this issue with VMWare but I haven't had any solution to the issue yet. I see no errors on my switches and there are no hardware issues as well. My SAN infrastucture is solid and there are 2 paths for every vmfs volume. Did anybody else experienced a similar issue? edit: Here are some more details: The iSCSI SAN software is Datacore Sanmelody 2.0.4.2 running on 2 HP Proliant G5 servers. The storage attached to each of the servers is an HP MSA70 and all the iSCSI SAN Volumes that are presented to my 4 ESX hosts are mirrored. I have two iSCSI swithces HP Procurve 1800G-24 that are trunked together. My SANLELODY servers are using NC360T NICs. I team two NICs and have one cable connecting to each iSCSi switch. Each ESX server uses two NICs as well for the iSCSI Network.

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  • Fixed and dynamic IPs in ISC DHPD lead to double lease

    - by GorillaPatch
    I would like to have a small dynamic adress part and the most clients are assigned a fixed IP adress. My dhcpd.conf looks like this: use-host-decl-names on; authoritative; allow client-updates; ddns-updates on; # Einstellungen fuer DHCP leases default-lease-time 3600; max-lease-time 86400; lease-file-name "/var/lib/dhcpd/dhcpd.leases"; subnet 192.168.11.0 netmask 255.255.255.0 { ddns-updates on; pool { # IP range which will be assigned statically range 192.168.11.1 192.168.11.240; deny all clients; } pool { # small dynamic range range 192.168.11.241 192.168.11.254; # used for temporary devices } } group { host pc1 { hardware ethernet xx:xx:xx:xx:xx:xx; fixed-address 192.168.11.11; } } The motivation for the pool declaration with deny all hosts comes from the ISC DHCPD homepage http://www.isc.org/files/auth.html This will allow hosts to be first added to the network, where they will receive a temporary IP from the 241-254 adress range and then later write an explicit host declaration. Upon next connect it will receive the right configuration. The problem is that I am getting error messages that 192.168.11.13 has a dynamic and a static lease. I am a bit confused as I expected the pool declaration with deny all clients would not count as dynamic. Dynamic and static leases present for 192.168.11.13. Remove host declaration pc1 or remove 192.168.11.13 from the dynamic address pool for 192.168.11.0/24 Is there a way to have the DHCP server send an DHCPNA to clients if they have a host statement and retain this dynamic range?

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  • Google Apps Sync bloated PST file to 14GB

    - by James S
    Back story: I have Outlook connected to my Google Apps email and noticed that some mail never got migrated from my original PST file. I found some VBA code online that compares mail in different PST folders, modified it to find missing and copy those to the target folder. I ran it folder by folder and moved missing mail. Before the exercise the Google Apps PST was about ~4GB and after it was ~4.7GB. Problem: I left Outlook open so Google Sync can copy it online. 24 hours later the Google Apps PST file bloated to 14GB+ and none of the mail has been synced to the cloud. I know that there should be at most ~5GB of mail. Why is the rest of the space being taken up? Funny thing is Gmail shows 3GB as being used online. What I tried: I emptied the deleted items folder and recycling bin I've run Outlook compact PST and it didn't work. I tried SCANPST.exe on the PST and it didn't work. I re-ran compact PST and it didn't work (after SCANPST found and fixed a few errors) Any ideas out there on what caused the problem and how to solve it?

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  • Reliable applicance for routing IT emergency calls (SIP and ISDN)

    - by chiborg
    We have a fairly big IT installation and our IT staff needs to be reachable 24/7. At the moment we have the following setup for "emergency" calls to our IT staff on our main Asterisk box: An incoming emergency number (connected via SIP trunk and a BRI card in case the SIP trunk goes down). When the number is called during the office hours, all the SIP phones of the IT staff are called simultaneously. When the number is called out of office hours interface, a list of mobile phone numbers is called, one after another until someone picks up. The list can be changed by the IT staff via command line script. The setup works well, but the Asterisk is heavily used in a call center, has experienced some outages and misconfigurations, each of them bringing down the IT emergency number. So we'd like to put the IT emergency call functionality on a separate device. This does not need to be a big server, it even does not need to be Asterisk, it only has one purpose and should do it reliably. It should be very low-maintenance. Any suggestions for hard- and software?

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  • 403 Forbidden error on Mac OSX - Apache and nginx

    - by tlianza
    Hi All, There are a million questions like this on Google, but I haven't found a solution to my problem. The default Apache install on my Mac is giving 403 Forbidden errors for everything (default directory, user home directory, virtual server, etc). After sifting through the config files, I figured I'd give nginx a try. Nginx serves files fine from it's home directory, but it won't serve files from a subfolder of my user directory. I've configured a simple virtual host, and requesting index.html returns a 403-forbidden. The error message in nginx's log file is pretty clear - it can't read the file: 2011/01/04 16:13:54 [error] 96440#0: *11 open() "/Users/me/Documents/workspace/mobile/index.html" failed (13: Permission denied), client: 127.0.0.1, server: local.test.com, request: "GET /index.html HTTP/1.1", host: "local.test.com" I've opened up this directory to everyone: drwxrwxrwx 6 me admin 204B Dec 31 20:49 mobile And all the files in it: $ ls -lah mobile/ total 24 drwxrwxrwx 6 me admin 204B Dec 31 20:49 . drwxr-xr-x 71 me me 2.4K Dec 31 20:41 .. -rw-r--r--@ 1 me me 6.0K Jan 2 18:58 .DS_Store -rwxrwxrwx 1 me admin 2.1K Jan 4 14:22 index.html drwxrwxrwx 5 me admin 170B Dec 31 20:45 nbproject drwxrwxrwx 5 me admin 170B Jan 2 18:58 script And yet, I cannot figure out why the nginx process cannot read index.html. It's running as the "nobody" user, but the permissions are set such that anyone can read them.

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  • Monitor reset itself and now I can't set the resolution/settings back to how it was before

    - by verve
    I've had my LG 24" widescreen monitor since 2009 and 2 weeks ago I noticed the monitor turned itself off (never had it done this before) so I switched it back on to find all the settings like gamma, resolution etc. different = looked like it had been reset. Everyone in the house swears they never unplugged and plugged it back in. When I opened a webpage the fonts and zoom on the pages were different and my desktop was strange too; fonts of the icons were different etc. The screen seems blurry and when I watch movies the faces look distorted so I thought I would try to first figure out the resolution it used to be but when I go under "Adjust screen resolution" none of the options work and there is no recommended resolution marked; all the options stretch out the screen and looks terrible so right now I have it set to the least distorted one. Then since the resolution wasn't working I set the other manual settings(done by physical buttons on the monitor) back to how it used to be (luckily, I had written these down). The monitor looks better but the resolution makes it a strain to use. I thought maybe some Windows update caused this crap so I tried to System Restore: didn't work. What went wrong? A few questions: 1) What was the likely cause of the monitor shutting down itself and screwing up the settings I have been using since the day I bought the monitor? 2) Why have the fonts changed everywhere unless this is a HDD/video card problem? 3) How do I find the perfect resolution it used to be? The monitor wants me to set it to 1920 x 1080 but that isn't one of the options although I don't remember what resolution I used before. I use the 16:9 setting while I try the available resolution options but nothing looks good! How do I find what it used to be? Manual available in PDF under Support: http://www.lg.com/ca_en/computer-products/monitors/LG-lcd-monitor-W2442PA-BF.jsp Win 7. IE 9.

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  • VSFTPD - FTP over TLS - Upload stops after exactly 82k?

    - by Redsandro
    I installed a VSFTP daemon on a CentOS server, using a RSA certificate for logging in using explicit TLS. Now, I cannot upload more than 82k. With files under that limit, there is no problem. The FTP works like a charm. But as soon as a file reaches 82k with FileZilla (81,952 bytes to be exact), the transfer will stop, and the FTP client hangs until time out is reached. FTP client console: 15:10:21 Command: STOR jquery-1.7.2.min.js 15:10:21 Response: 150 Ok to send data. 15:11:21 Error: Connection timed out 15:11:21 Error: File transfer failed after transferring 82 KB in 60 seconds /var/log/vsftpd.log FTP command: Client "x.x.x.x", "STOR jquery-1.7.2.min.js" FTP response: Client "x.x.x.x", "150 Ok to send data." OK UPLOAD: Client "x.x.x.x", "jquery-1.7.2.min.js", 81952 bytes, 1.32Kbyte/sec FTP response: Client "x.x.x.x", "226 File receive OK." // NOT okay, file is bigger // No mention of error here I cannot find relevant info about this problem, apart from a possible problem with trans_chunk_size (not mentioned in default config), but I tried different sizes and it has no impact on the problem. trans_chunk_size=4096 trans_chunk_size=8192 trans_chunk_size=9999 Ofcourse, after every configuration change, I restarted the server: /etc/init.d/vsftpd restart What else can cause this? It's not the latest version, but it's the latest update within the repositories that has been deemed fit for enterprise usage: Package info: $ yum info vsftpd Loaded plugins: fastestmirror Installed Packages Name : vsftpd Arch : x86_64 Version : 2.0.5 Release : 24.el5_8.1 Size : 286 k Repo : installed Summary : vsftpd - Very Secure Ftp Daemon URL : http://vsftpd.beasts.org/ License : GPL Description: vsftpd is a Very Secure FTP daemon. It was written completely from scratch.

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  • Excessive PHP errors in Joomla

    - by Rodnower
    I have Joomla 2.5 installed on Windows 7 with Apache 2 and PHP 5. I have countless PHP errors in the log like the following: [01-Sep-2012 19:33:55 UTC] PHP Strict standards: Only variables should be assigned by reference in C:\ammon_dev\ammon\plugins\system\jquery\jquery.php on line 24 [01-Sep-2012 19:33:55 UTC] PHP Stack trace: [01-Sep-2012 19:33:55 UTC] PHP 1. {main}() C:\ammon_dev\ammon\administrator\index.php:0 [01-Sep-2012 19:33:55 UTC] PHP 2. JAdministrator->route() C:\ammon_dev\ammon\administrator\index.php:40 [01-Sep-2012 19:33:55 UTC] PHP 3. JApplication->triggerEvent() C:\ammon_dev\ammon\administrator\includes\application.php:106 [01-Sep-2012 19:33:55 UTC] PHP 4. JDispatcher->trigger() C:\ammon_dev\ammon\libraries\joomla\application\application.php:670 [01-Sep-2012 19:33:55 UTC] PHP 5. JEvent->update() C:\ammon_dev\ammon\libraries\joomla\event\dispatcher.php:161 [01-Sep-2012 19:33:55 UTC] PHP 6. call_user_func_array() C:\ammon_dev\ammon\libraries\joomla\event\event.php:71 [01-Sep-2012 19:33:55 UTC] PHP 7. plgSystemJquery->onAfterRoute() C:\ammon_dev\ammon\libraries\joomla\event\event.php:71 I tried disabling error logging in php.ini: error_reporting = E_ALL & ~E_DEPRECATED & ~E_STRICT Unfortunately that does not make a difference. Joomla isn’t in debug mode, and I am sure that I’m editing the correct copy of php.ini because other changes I make to it take effect. Any ideas why I am getting so many errors or how to stop it from exploding the log?

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  • What is the difference between the Linux and Linux LVM partition type?

    - by ujjain
    Fdisk shows multiple partition types. What is the difference between choosing 83) Linux and 8e) Linux LVM? Choosing 83) Linux also works fine for using LVM, even creating a physical volume on /dev/sdb without a partition table works. Does picking a partition type in fdisk really matter? What is the difference in picking Linux or Linux LVM as partition type? [root@tst-01 ~]# fdisk /dev/sdb WARNING: DOS-compatible mode is deprecated. It's strongly recommended to switch off the mode (command 'c') and change display units to sectors (command 'u'). Command (m for help): l 0 Empty 24 NEC DOS 81 Minix / old Lin bf Solaris 1 FAT12 39 Plan 9 82 Linux swap / So c1 DRDOS/sec (FAT- 2 XENIX root 3c PartitionMagic 83 Linux c4 DRDOS/sec (FAT- 3 XENIX usr 40 Venix 80286 84 OS/2 hidden C: c6 DRDOS/sec (FAT- 4 FAT16 <32M 41 PPC PReP Boot 85 Linux extended c7 Syrinx 5 Extended 42 SFS 86 NTFS volume set da Non-FS data 6 FAT16 4d QNX4.x 87 NTFS volume set db CP/M / CTOS / . 7 HPFS/NTFS 4e QNX4.x 2nd part 88 Linux plaintext de Dell Utility 8 AIX 4f QNX4.x 3rd part 8e Linux LVM df BootIt 9 AIX bootable 50 OnTrack DM 93 Amoeba e1 DOS access a OS/2 Boot Manag 51 OnTrack DM6 Aux 94 Amoeba BBT e3 DOS R/O b W95 FAT32 52 CP/M 9f BSD/OS e4 SpeedStor c W95 FAT32 (LBA) 53 OnTrack DM6 Aux a0 IBM Thinkpad hi eb BeOS fs e W95 FAT16 (LBA) 54 OnTrackDM6 a5 FreeBSD ee GPT f W95 Ext'd (LBA) 55 EZ-Drive a6 OpenBSD ef EFI (FAT-12/16/ 10 OPUS 56 Golden Bow a7 NeXTSTEP f0 Linux/PA-RISC b 11 Hidden FAT12 5c Priam Edisk a8 Darwin UFS f1 SpeedStor 12 Compaq diagnost 61 SpeedStor a9 NetBSD f4 SpeedStor 14 Hidden FAT16 <3 63 GNU HURD or Sys ab Darwin boot f2 DOS secondary 16 Hidden FAT16 64 Novell Netware af HFS / HFS+ fb VMware VMFS 17 Hidden HPFS/NTF 65 Novell Netware b7 BSDI fs fc VMware VMKCORE 18 AST SmartSleep 70 DiskSecure Mult b8 BSDI swap fd Linux raid auto 1b Hidden W95 FAT3 75 PC/IX bb Boot Wizard hid fe LANstep 1c Hidden W95 FAT3 80 Old Minix be Solaris boot ff BBT 1e Hidden W95 FAT1 Command (m for help):

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  • What is the IPv6 equivalent to IPv4 RFC1918 addresses?

    - by Kumba
    Having a hard time wrapping my head around IPv6 here. A lot of the lingo seems targeted at enterprise-level IPv6 deployments, discussing link-local, site-local, global unicast, scopes, etc. Not a lot of solid information on really small networks, like home networks. I want to check my thinking and make sure I am getting the correct translations from IPv4-speak to IPv6-speak. The first question is, what's the equivalent of RFC1918 for IPv6? Initial searches suggested there was no equivalent. Then I stumbled upon Unique Local Addresses (RFC4193), and that states that all ULA's should be assigned the prefix fc00, followed by a 40-bit random number in the routing prefix. This random number is to "prevent collisions when two IPv6 networks are interconnected" -- again, another reference to an enterprise-level function. If I have a small local LAN at home, numbered using 192.168.4.0/24, what's my equivalent in IPv6's ULA scope? Assuming I will never, ever, tie that IPv6 address into the real internet (a router will NAT & firewall it), can I ignore the RFC to an extent and go with fc00::4:0/120? It also seems that any address in fc00::/7 are to be globally routable. Does this mean I'll need extra protections so my router would not automatically start advertising these private IPv6 addresses to the world? Second question, what's this link-local thing? Reading suggests a default-assigned address in the fe80::/10 range that has the last 64bits of the address comprised of the interface's MAC address. Seems to be required, too, but I'm annoyed by the constant discussion of it in relation to enterprise networks. Third question, what is scope id for? Seems to be yet another term tossed around in relation to enterprise networks, especially when interconnecting them, but almost no explanation on the smaller home network level. Can I see a scope ID AND CIDR notation used together? I.e., fc00::4:0/120%6, or are scope IDs only supposed to be applied to a single /128 IPv6 address?

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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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  • 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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  • Processing-time billing in Amazon EC2

    - by Rafael Almeida
    Hi all! I think my question is fairly basic, but I would like a clarification: in the Pricing part of AWS we can see that Amazon charges people around .10 by the 'instance computing hour'. I've seen in a blog post somewhere (can't remember where exactly, and even if I did I think it was in Portuguese anyway) that this way your minimum monthly payment would be $72 (= .10 $s/hour x 24 hours x 30 days). Is this correct? (I don't think it is!) In my understanding is that this 'virtual computing time' is only used when your machine is actually doing something (serving pages, serving the admin via ssh, whatever), so real billable usage would be less than 720 hours/month in most webserver scenarios. Is my view correct? If it is, then it leads me to another question: is it economically interesting to buy access to one of these instances for testing? I mean, would I have the 'freedom' to 'forget' about it for a month and receive a very-close-to-zero (as in, a few cents) bill? Do you do it/know of anybody who does? Any thoughts on the matter (as in, "yes, it's a good idea", or "yes, but there's this 'gotcha': ...", or "no, nobody does it because of...")? PS: sorry for the loong question text. I highlighted the main questions for easy view. Also, I'm not sure if this question is actually more than one and if it's desirable for the community, so, sorry if it is too! Thanks in advance!

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  • Unable to receive emails from Ubuntu postfix mail server

    - by Paddington
    I am unable to receive emails on an Ubuntu 11.04 server running postfix with the Plesk control panel. I can't see the mails even on webmail. I am able to send emails and am not getting any error messages on the email client when I try to receive. Here is the output of the logs: *tail -f /usr/local/psa/var/log/maillog Aug 29 10:38:31 cp9 postfix/tlsmgr[3811]: fatal: open database /var/lib/postfix/smtpd_scache.db: Invalid argument Aug 29 10:38:32 cp9 postfix/master[27738]: warning: process /usr/lib/postfix/tlsmgr pid 3811 exit status 1 Aug 29 10:38:32 cp9 postfix/master[27738]: warning: /usr/lib/postfix/tlsmgr: bad command startup -- throttling Aug 29 10:38:36 cp9 pop3d: Connection, ip=[::ffff:196.201.7.158] Aug 29 10:38:36 cp9 pop3d: IMAP connect from @ [::ffff:196.201.7.158]INFO: LOGIN, [email protected], ip=[::ffff:196.201.7.158] Aug 29 10:38:37 cp9 pop3d: 1346229517.874008 LOGOUT, [email protected], ip=[::ffff:196.201.7.158], top=0, retr=0, time=1, rcvd=24, sent=1716, maildir=/var/qmail/mailnames/essentialhuku.co.za/earle/Maildir Aug 29 10:14:05 cp9 postfix/tlsmgr[1133]: fatal: open database /var/lib/postfix/smtpd_scache.db: Invalid argument Aug 29 10:14:06 cp9 postfix/master[27738]: warning: process /usr/lib/postfix/tlsmgr pid 1133 exit status 1 Aug 29 10:14:06 cp9 postfix/master[27738]: warning: /usr/lib/postfix/tlsmgr: bad command startup -- throttling Aug 29 10:14:08 cp9 pop3d: Connection, ip=[::ffff:196.201.7.158

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  • Setting MSN or Yahoo! Messenger status to Invisible or Offline when idle for an hour

    - by Jian Lin
    Where, or how, do I set it up in MSN Messenger or Yahoo! Messenger to automatically switch my status to either "Invisible" or "Offline" when idle for a half hour, or an hour? I know how to set my status as "Away" or "Busy" after 10 minutes, but can't seem to find a way to set the offline status options without manual intervention. Back story As a software developer, I am very used to turning the computer on for the whole day and not turning it back off. (For example, checking email for urgent fixes, fix issue and push to web server). It's not even turned off when heading to sleep in case I might find it hard to fall asleep and come back to check on the computer. Or to have it there ready in the morning to check that everything is okay. If I'm seen as being online for 24 hours of a day, some people see me as weird. Their perception of my value decreases as I'm always there (hard to get = high value; always there = low value). Leaving it on makes everyone in my contacts list think I have nothing better to do all day than sit in front of the computer. Even though it's my job and I do admittedly spend more time online than other people. That's why I'd like to find a way to set my status as Invisible or Offline.

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  • Raid1 with active and spare partition

    - by Daniel Baron
    I am having the following problem with a RAID1 software raid partition on my Ubuntu system (10.04 LTS, 2.6.32-24-server in case it matters). One of my disks (sdb5) reported I/O errors and was therefore marked faulty in the array. The array was then degraded with one active device. Hence, I replaced the harddisk, cloned the partition table and added all new partitions to my raid arrays. After syncing all partitions ended up fine, having 2 active devices - except one of them. The partition which reported the faulty disk before, however, did not include the new partition as an active device but as a spare disk: md3 : active raid1 sdb5[2] sda5[1] 4881344 blocks [2/1] [_U] A detailed look reveals: root@server:~# mdadm --detail /dev/md3 [...] Number Major Minor RaidDevice State 2 8 21 0 spare rebuilding /dev/sdb5 1 8 5 1 active sync /dev/sda5 So here is the question: How do I tell my raid to turn the spare disk into an active one? And why has it been added as a spare device? Recreating or reassembling the array is not an option, because it is my root partition. And I can not find any hints to that subject in the Software Raid HOWTO. Any help would be appreciated.

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  • Apache 2.2.21 installation on Linux 6 but got error while accessing in browser

    - by JRanjan
    I am very new to linux. I have install apache 2.2.21 on linux 6 platform. While i am using ./apachectl start or ./apachectl -k start command it shows that apache is started. But while i am trying to to access apache default page in any browser using " http://:8080 " it shows page cannot be displayed. Can any one help me on this issue ??????? Plz its urgent.. I am also enclosing the error_log file as below: error_log file [Thu Nov 24 08:57:23 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 01:45:58 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 01:46:12 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 01:46:12 2011] [notice] Digest: done [Fri Nov 25 01:46:13 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 01:54:58 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 01:55:10 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 01:55:10 2011] [notice] Digest: done [Fri Nov 25 01:55:11 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 01:58:10 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 01:59:41 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 01:59:41 2011] [notice] Digest: done [Fri Nov 25 01:59:42 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 03:23:14 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 03:27:36 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 03:27:36 2011] [notice] Digest: done [Fri Nov 25 03:27:37 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 08:52:27 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 08:52:43 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 08:52:43 2011] [notice] Digest: done [Fri Nov 25 08:52:44 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Fri Nov 25 09:21:39 2011] [notice] caught SIGTERM, shutting down [Fri Nov 25 09:21:57 2011] [notice] Digest: generating secret for digest authentication ... [Fri Nov 25 09:21:57 2011] [notice] Digest: done [Fri Nov 25 09:21:58 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations [Mon Nov 28 01:06:58 2011] [notice] caught SIGTERM, shutting down [Mon Nov 28 01:07:58 2011] [notice] Digest: generating secret for digest authentication ... [Mon Nov 28 01:07:58 2011] [notice] Digest: done [Mon Nov 28 01:07:59 2011] [notice] Apache/2.2.21 (Unix) DAV/2 configured -- resuming normal operations

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  • Tripwire help Required

    - by ramaperumal
    I have created the policy file in Tripwire and also I have created the rules as well mentioned below: /opt/jboss/server/gis/conf -> $(SEC_CONFIG) +aipm +c+g+a+i+s+t+u+l+M; /usr/local/gtech/eseries/ -> $(SEC_CONFIG) +a+c+g+i+s+t+u+l+M ; After running the integrity check the output should be a(Access timestamp),c (Inode timestamp (create/modify),g (File owner's group ID),i (Inode number),s (File size),t (time stamp),u (File owner's user ID),l(File is increasing in size (a "growing file"),M (MD5 hash value). I am getting the output as below: [root@xxsi1242 tripwire]# tripwire --check Parsing policy file: /etc/tripwire/tw.pol *** Processing Unix File System *** Performing integrity check... Wrote report file: /var/lib/tripwire/report/xxsi1242.gtk.gtech.com-20131106-053812.twr Open Source Tripwire(R) 2.4.1 Integrity Check Report Report generated by: root Report created on: Wed 06 Nov 2013 05:38:12 AM EST Database last updated on: Wed 06 Nov 2013 05:31:17 AM EST =============================================================================== Report Summary: =============================================================================== Host name: xxsi1242.gtk.gtech.com Host IP address: 156.24.65.171 Host ID: None Policy file used: /etc/tripwire/tw.pol Configuration file used: /etc/tripwire/tw.cfg Database file used: /var/lib/tripwire/xxsi1242.gtk.gtech.com.twd Command line used: tripwire --check =============================================================================== Rule Summary: =============================================================================== ------------------------------------------------------------------------------- Section: Unix File System ------------------------------------------------------------------------------- Rule Name Severity Level Added Removed Modified --------- -------------- ----- ------- -------- Invariant Directories 66 0 0 0 Temporary directories 33 0 0 0 * Tripwire Data Files 100 0 0 1 Tech Stack 100 0 0 0 User binaries 66 0 0 0 Tripwire Binaries 100 0 0 0 * CLPS bins 100 0 0 2 CLPS Configuration files 100 0 0 0 ESCommon 100 0 0 0 Shell Binaries 100 0 0 0 OS executables and libraries 100 0 0 0 Security Control 100 0 0 0 ESCommon Configuration 100 0 0 0 (/etc/gtech/escommon) Total objects scanned: 12358 Total violations found: 3 =============================================================================== Object Summary: =============================================================================== ------------------------------------------------------------------------------- # Section: Unix File System ------------------------------------------------------------------------------- ------------------------------------------------------------------------------- Rule Name: Tripwire Data Files (/etc/tripwire/tw.pol) Severity Level: 100 ------------------------------------------------------------------------------- Modified: "/etc/tripwire/tw.pol" ------------------------------------------------------------------------------- Rule Name: CLPS bins (/opt/jboss/server) Severity Level: 100 ------------------------------------------------------------------------------- Modified: "/opt/jboss/server/esapps1/data/hypersonic/localDB.lck" "/opt/jboss/server/gis/data/hypersonic/localDB.lck" =============================================================================== Error Report: =============================================================================== No Errors ------------------------------------------------------------------------------- *** End of report *** Note: In the output I only am getting the files which are modified. I need the detail output for this. But unfortunately I am not getting what I expected. Please help me to proced further.

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  • maximum number of connections Squid

    - by Isaac
    I have a Squid proxy server that controls all internet traffic for my network. I need a way to stop users from downloading big files (say 50MB) in my network. I banned some famous ports (e.g. torrent) but some downloads are possible by HTTP port. Obviously I cannot ban port 80! A simple solution is limiting maxmimum number of the simultaneous connections for each IP (e.g. 3 connections). It's possible in Squid with this config: acl ACCOUNTSDEPT 192.168.5.0/24 acl limitusercon maxconn 3 http_access deny ACCOUNTSDEPT limitusercon But this solution has really bad impact in web browsing, because any smart browser get different parts of a website by several connections simultaneously to speedup web browsing. But if we have a maximum number of connections, the browsers will fail to get some parts and the website will be shown partially and some parts/images/frames will not be shown. So, can we limit maximum number of persist connections? I think this policy will works: Specify Maximum number of connections that is alive for 10 seconds But Number of simultaneous connections for every IP is unlimited But how can we implement this policy when Squid? With which config? UPDATE: artifex and Tom Newton offered using a bandwidth-limiting approach to fight against downloaders. But bandwidth-limiting in Squid has a shortcoming: It's static and cannot dynamically change. So a person has a limited bandwidth not matter how many people are using internet (maybe nobody!) Also, this solution cannot help to stop people from downloading. They still can download but in a lower speed. But if we find a way to terminate persist connections (or any connection that is alive more than a specific time), downloading big files will be almost impossible (always there is some way!)

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