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  • How to tune system settings for mongoDB on Linux?

    - by jsh
    Trying to squeeze a lot out of one question here -- please bear with me. Although the MongoDB man pages make several useful recommendations about system settings like ulimit (http://docs.mongodb.org/manual/reference/ulimit/), and other production factors (http://docs.mongodb.org/manual/administration/production-notes/) they seem mysteriously silent on things like virtual memory and swap settings. The closest we get to a hint is that "...the operating system’s virtual memory subsystem manages MongoDB’s memory..." (http://docs.mongodb.org/manual/faq/fundamentals/#does-mongodb-require-a-lot-of-ram). Running the same job - high writes and high reads on about 10,000,000 records in a single collection -- on my 4-processor, 4GB RAM macbook and an 8-core ubuntu box with 64GB RAM I saw dramatically WORSE read performance on the linux box with factory settings, and could hear the disk constantly spinning, indicating high I/O and presumably swapping. Yes, other things were happening on the box, but there was plenty of free RAM, disk space, etc.; furthermore, I did not see evidence that Mongo was expanding to take advantage of all that free RAM as it is touted to do. Linux box default settings were as follows: vm.swappiness =60 vm.dirty_background_ratio = 10 vm.dirty_ratio = 20 vm.dirty_expire_centisecs =3000 vm.dirty_writeback_centisecs=500 I hazarded some guesses looking at docs and blogs for other types of databases (Oracle, MYSQL, etc.), experimented, and adjusted as below. vm.swappiness=10 vm.dirty_background_ratio=5 vm.dirty_ratio=5 vm.dirty_writeback_centisecs=250 vm.dirty_expire_centisecs=500 I saw some immediate apparent improvements in read time. However, when I ran my test jobs again, read performance continued to be painfully sluggish during heavy writes. Then, I REBUILT the collection from an available data source - and suddenly I can read at 1ms or less per record WHILE doing the write job! So the question is really two-fold: 1) What are appropriate VM settings for MongoDB on Linux? 2) (bonus) Does Mongo do some checking or optimization with the OS while data is being built? In other words, if I have built a large data set with suboptimal VM or I/O settings, does Mongo make assumptions during the memory-mapping process that will fail to take advantage of optimizations down the road? Obviously I don't fully grok memory mapping under the hood (I was hoping I wouldn't have to). Any help appreciated...thanks! -j

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  • How to securly join two networks together over the Internet?

    - by Pyrolistical
    Let's say there are two locations. Both locations have their own fast Internet connections. How do you join these two networks together such that every computer can see every other computer? Do you need a domain controller, or can you do this with workgroups? EDIT The obvious solution seems to be VPN, but can VPN be implemented on the routers only? Can the computers on the network be configuration free?

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  • Best linux USB DVB-T hardware

    - by Roalt
    What is the best supported USB-based DVB-T (free-to-air) tuner for Linux? I've seen a similar question, but this one is PCI-based, not USB: http://superuser.com/questions/104663 I've tried the Conceptronic CTVDIGRCU v3.0 but it does not pick up any channels (although it does work on windows).

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  • I/O Reads and Writes per process Unix/SunOS?

    - by Alex
    Can prstat or something similar tell me how many reads/writes a process is doing similar to how Task Manager on Windows can show I/O Reads, I/O Writes and many other I/O columns per process? I'm using SunOS 5.10, but feel free to post other Unix flavours too.

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  • Cancelled a format using diskpart at 0%. Can I get the data back?

    - by Sudarshan
    I wanted to format my USB thumbdrive, but incorrectly did the following on my external HDD!! CMD -- Diskpart select disk 2 clean create partition primary select partition 1 active format fs=fat32 While it was still at 0% however, I cancelled the format and quit from CMD. I can no longer see the HDD in My computer though, and it shows up as below in diskpart Disk 1 Status - Online Size- 1800 GB Free - 0B Is there anything I can do to get the data and HDD back?

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  • How to take backup of any online file in email?

    - by Jitendra vyas
    For example this is file : http://sstatic.net/su/all.css I want to take automatically backup this file in my email for every/hour/5 hour etc? I need free and portable solution. and i don't have access to any FTP and cpanel server of that file which i want to take as a backup. and I use Windows.

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  • is AV software needed for Windows XP Mode on Windows 7?

    - by Wesley
    Hi all, I just got Windows XP Mode on my Windows 7 Professional 64-bit machine. I notice that the Windows XP Security Center notes that I don't have any virus protection. However, I'm running AVG Free on Windows 7. Do I need to have some sort of anti-virus program installed on Windows XP Mode? Thanks in advance.

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  • file split tool for Windows

    - by George2
    Hello everyone, I am using Windows 7 and I have a big text file (log file) which needs to be splitted into small files. Any good tool to use? I prefer to use line based split tool if available. It is better free and easy to use. thanks in advance, George

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  • Backup data to remote dedicated server

    - by Alex Bagnolini
    My company already has a "local" backup strategy, but is willing to also backup data on our remote dedicated server as an additional "plus". Some info: Both machines are Windows Server (client is 2003, server is 2008) Administrator rights on both machines Valid SSL Certificate available FTP/IIS Server available and in use Required cryptation during transfer & storage Free space is not a problem Which software (both client and server side) you advice us to take?

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  • Zabbix not getting data for one filesystem

    - by Dennis Williamson
    I have Zabbix monitoring disk space for several volumes on several servers. It works fine on all of them except for one of the volumes on one of the servers which always reports as 0. However, when I run ./zabbix_get -s localhost -p 10050 -k 'vfs.fs.size[/home, free]' locally on the machine in question, it gives me the correct, non-zero size which matches the output of df. How can I go about troubleshooting and correcting this problem?

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  • Copy filename to clipboard

    - by Charles Roper
    I am looking for a Windows utility that can copy the currently selected filename, including the path, to the clipboard, ideally through the right-click menu. Some degree of flexibility would be useful, like the ability to copy just the filename, path+filename, filename minus extension, etc. This isn't essential, though, as long as it can copy the path+filename. Must be compatible with XP, Vista and Win7. Free and/or open source would be ideal. Thanks!

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  • Utility for managing window locations

    - by chief7
    Any suggestions for a free or cheap app for managing window locations/placement in Windows 7? I'm constantly remoting in and out of my workstation with a varying number of monitors and would like to setup profiles of windows placement that can be run to readjust my window locations depending on the number of screens I'm using.

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  • How do I restore a partition without losing the data?

    - by sama
    I lost the D-partition in My Computer I opened My Computer, but couldn't find it and I don't know where it is or how to return it. I went to Disk Management and found it available as free space. So I tried to make it NTFS, but I had to format the drive and I don't want to, since it will erase my data. Does anyone know how I can restore my partition without losing my data?

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  • Server monitoring?

    - by Jim
    is there a free, open source server monitoring tool like Nagios that runs on the MS stack? It will need to be able to detect service stoppages and starts also.

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  • How does BTRFS compare to ZFS?

    - by Zubair
    I am considering which OS and filesystem to use on some new servers I have and am considering either Free BSD with ZFS, or Linux with BTRFS. The programs I have run on both systems, so the only issue is reliability of the filesystems and performance, etc.

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  • Does 64bit Windows 8 have the same 75% memory-usage limitation for applications as Windows 7?

    - by Barleyman
    64bit Windows 7 (and Windows Vista) have a built-in limit of not being able to use the last 25% of RAM. You will get a low memory warning when you get close to the limit. Even if you disable that warning, applications will run out of memory and crash since the OS will refuse to allocate memory from that last 25%. That was fine when Vista was designed, when machines had 1 GB of total memory, but is pretty daft for today's 8 GB machines. Yes, the system will run cache, etc. on that extra 2 GB, but running out of memory when you have "merely" 2 GB left.... NB: this has nothing to do with the page file. If you limit the page file to a sensible size like 2 GB, you will still see this behavior. The system will cram the page file to the last byte while refusing to touch that 1/4th of the RAM. Does Windows 8 change this behavior? Is there now some fixed minimum free RAM requirement, like 512 MB, or is it still 25%? Can you actually adjust the low memory limit? EDIT: Here is another older post here which discusses this same behavior on Windows 7. There is fixed 25% limit in Windows 7 and I'd like to know if it's still in Windows 8. Windows 7 / Page File Disabled / 12 GB RAM / 2+ GB RAM free and "your computer is running low on memory" Edit2: Here is another link discussing the low memory warning and how to disable it. Note he claims the limit for RAM usage is 80%, not 75%. It would seem to be correct as you can in fact allocate 6.4GB of RAM with 8GB machine. Anything above and beyond that goes to the pagefile, though. http://halflight.com.au/2011/04/06/how-to-disable-low-memory-warnings-and-the-advantages-of-removing-the-page-file/ Edit3: a Here's couple of process explorer screenshots that demonstrate how it goes down. Exhibit1: https://dl.dropbox.com/u/42068601/sysinfo.jpg Exhibit2: https://dl.dropbox.com/u/42068601/sysint2.jpg You can see that Windows 7 will use the memory 6.4GB as the very last resort. I have low memory warning switched off here so programs crashed at the last screenshot allocation. With low memory warning turned on, it starts nagging before you can push OS to use that remaining 1.6GB. The question is not "Is it OK windows does not want to allocate last 20% of RAM because X", it's "Does Windows 8 still behave this way". With 16GB this really becomes dumb.

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  • How to read and write Mac drives on Windows

    - by Svish
    I have some external hard drives that are Mac OS Extended (Journaled) formatted. What software can you recommend for working with those drives when under Windows? Do you have any experience with this? Would be best if the software is free, but it doesn't have to be. Hope someone can help!

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