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  • Linux IO monitoring per file?

    - by MattK
    I am interested in a utility or process for monitoring disk IO per file on CentOS. On Win2008, the resmon utility allows this type of drilldown, but none of the Linux utilities I have found do this (iostat, iotop, dstat, nmon). My interest in monitoring IO bottlenecks on database servers. With MSSQL, I have found it an informative diagnostic to know which files / filespaces are getting hit the hardest.

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  • Linux per-process resource limits - a deep Red Hat Mystery

    - by BobBanana
    I have my own multithreaded C program which scales in speed smoothly with the number of CPU cores.. I can run it with 1, 2, 3, etc threads and get linear speedup.. up to about 5.5x speed on a 6-core CPU on a Ubuntu Linux box. I had an opportunity to run the program on a very high end Sunfire x4450 with 4 quad-core Xeon processors, running Red Hat Enterprise Linux. I was eagerly anticipating seeing how fast the 16 cores could run my program with 16 threads.. But it runs at the same speed as just TWO threads! Much hair-pulling and debugging later, I see that my program really is creating all the threads, they really are running simultaneously, but the threads themselves are slower than they should be. 2 threads runs about 1.7x faster than 1, but 3, 4, 8, 10, 16 threads all run at just net 1.9x! I can see all the threads are running (not stalled or sleeping), they're just slow. To check that the HARDWARE wasn't at fault, I ran SIXTEEN copies of my program independently, simultaneously. They all ran at full speed. There really are 16 cores and they really do run at full speed and there really is enough RAM (in fact this machine has 64GB, and I only use 1GB per process). So, my question is if there's some OPERATING SYSTEM explanation, perhaps some per-process resource limit which automatically scales back thread scheduling to keep one process from hogging the machine. Clues are: My program does not access the disk or network. It's CPU limited. Its speed scales linearly on a single CPU box in Ubuntu Linux with a hexacore i7 for 1-6 threads. 6 threads is effectively 6x speedup. My program never runs faster than 2x speedup on this 16 core Sunfire Xeon box, for any number of threads from 2-16. Running 16 copies of my program single threaded runs perfectly, all 16 running at once at full speed. top shows 1600% of CPUs allocated. /proc/cpuinfo shows all 16 cores running at full 2.9GHz speed (not low frequency idle speed of 1.6GHz) There's 48GB of RAM free, it is not swapping. What's happening? Is there some process CPU limit policy? How could I measure it if so? What else could explain this behavior? Thanks for your ideas to solve this, the Great Xeon Slowdown Mystery of 2010!

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  • Per bytes RAM memory acess

    - by b-gen-jack-o-neill
    Hi, I have just a simple question. Today memory DDR chips are 64 bits wide, and the CPU data bus is also 64 bits wide. But memory is stil organised in single bytes. So, what I want to ask is, when CPU selects some memory adress, it should be one byte, right? Becouse the lowest memory portion you can access is 1 byte. But, if you get 1 byte per 1 adress, why is memory bus 8 bytes wide?

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  • Why don't monitors have more pixels per inch?

    - by ULTRA_POROV
    72 ppi is nothing. And we have been stuck with this for 20 years. Why do we need to resort to stupid tech like anti-aliasing instead of resolving the core of the issue, more pixels per inch!!! It is really surprising considering all the progress cpu's, video cards, etc. have made.

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  • Linux - quota per directory?

    - by depesz
    I have following scenarios: Single partition mounted as /, with lots of disk space. There is a range of directories (/pg/tbs1, /pg/tbs2, /pg/tbs3 and so on), and I would like to limit total size of these directories. One option is to make some big files, and then mkfs them, and mount over loopback, and then set quota, but this makes expansion a bit problematic. Is there any other way to make the quota work per directory?

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  • Change the Mac notification sound on a per-application basis

    - by Mark Szymanski
    By default on Mac OS X there is a system-wide notification sound that you can choose. This sound is applied to every application and played whenever the application outputs a beep (for instance, when typing a keyboard shortcut that doesn't work, or during a terminal beep). Is there any way to change what sound this is on a per-application basis? Specifically, I'm looking to change the sound Terminal.app uses, while every other app uses another sound.

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  • tracking bandwidth usage per person

    - by deepak
    We have an office of 15 people and all of us share one connection One person can hog the connection to consume all the bandwidth. which of these router firmwares would allow me to restrict access to certain mac address track bandwidth usage per mac-address or some personal identity I do not want to track the actual websites visited, only the total bandwidth usage Also want to use a router, not a dedicated computer

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  • Monitoring Bandwidth Usage (Per Internal IP) - Cisco ASA 5505

    - by Joseph Sturtevant
    I manage a small network with a Cisco ASA 5505 and a shared DSL connection. I would like to be able monitor the bandwidth usage of the various users/devices on my network (by IP). Can I do that using the ASA? Has anyone got this working? What is the best way to do this? Some Ideas I Have Seen Online: SNMP with a tool like Cacti Does this give per IP usage with an ASA or just overall usage? Netflow with a tool like ntop Couldn't get this to work. It seems that the Netflows sent by ASA are not exactly standard. Ntop receives them, but doesn't seem to know what do with them.

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  • MySQL per-database replication?

    - by LucasBr
    So, my problem is interesting: we want to migrate from one server to another. We made a master-slave replication, but my boss came with the idea to make migration one database at a time. So he asked me to setup at the new server another MySQL instance, let the slave almost as-is and make the new instance be the new master incrementally, one database at a time. Is it possible, that is, can I transfer the database 'x' from old master to new master and just tell slave to synchronize 'x' at the new master from now on? I've read at this old thread ( Mysql Replication - are per-database threads possible? ) that this was not possible at that time. This can be done now? Thanks! Lucas Bracher.

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  • Hardware issue: UI freezes and hard drive light goes solid several times per hour

    - by alchemical
    I have a workstation that has been acting up for the last few weeks. It currently has Windows Server 2008 R2 installed on it, and 2 HDD mirrored. A few times per hour the screen will freeze up, applications will say "not responding", sometimes the screen will turn a lighter shaded color--at the same time the HDD light is on solid. This lasts anywhere from 10 to about 50 seconds. Could this be something with one of the drives or the mechanism keeping the mirror in place? Any other ideas?

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  • Cheapest server per gigabit throughput [closed]

    - by nethgirb
    I'm looking for a set of servers for performance testing a network, and secondarily testing some applications on the servers. Their most important task is simply to pump out data: from an application like memcached or just dumped from a large file in memory into a TCP flow (i.e., disk performance doesn't matter). This should happen over one or more 1 gigabit Ethernet ports, and the machines should run Linux (ideally), or perhaps Mac OS X or some other *nix. Other than that, there are few constraints (e.g., even something ARM-based could be fine). So here's the question: What's the cheapest server per gigabit? Price and power are both considerations.

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  • how to limit disk space per user in a PHP web application & CentOS

    - by solid
    we have a web application written in PHP and we want all our users to be able to upload images for e.g. 50MB. We will create a directory structure so that every user has its own folder like app/user1/images app/user2/images ... Now everytime a user uploads an image, we need to check if this is still allowed or not but we don't want 1000 users to continously scan our hard drive counting file sizes in their directory. So writing a script that counts all file sizes in a user directory is not an option I guess? Is there an easier way to calculate used up space per user and limit our app accordingly?

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  • Linux Router - Share bandwidth per IPs with current active connections

    - by SRoe
    We have a Linux machine running as a custom router, currently utilising Shorewall. This sits between our incoming internet connection and the internal LAN. What we would like to achieve is 'fair use' of the bandwidth on a per IP basis. If only one person currently has an active connection then they get 100% utilisation of the line. However if 20 people have active connections then they should each get 5% utilisation of the line. This should be irrespective of the number of connections held by each user. For example, say we have two users, Bill and Ted, that both have active connections. Bill has a single active connection while Ted has ten active connections. Bill should get 50% utilisation for his single connections whilst Ted should get 5% utilisation for each of his ten connections, giving Ted a total utilisation of 50%.

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  • Postfix count relayed messages per user

    - by Martino Dino
    I would like to know if it's possible to count the outgoing (relayed) messages on a per user basis in postfix. I'm managing a small commercial SMTP relay and decided that it would be nice to have a detailed daily report on how much mail a single user have sent (and eventually enforce some limits) possibly in realtime. I've looked almost everywhere and started to think that writing my own milter would be the way to go... Are you aware of anything that already exists for postfix that can count and report relayed mail for authenticated users (a script, milter or whatever)?

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  • iSCSI: LUNs per target?

    - by badnews
    My question relates specifically to ZFS/COMSTAR but I assume is generally applicable to any iSCSI system: Should one prefer to create a target for every LUN that you want to expose? Or is it good practise to have a single target with multiple LUNs? Does either approach have a performance impact? And is there some crossover point where the other approach makes sense? The use case is for VM disks, where each disk (zvol) is a LUN. So far we have created a a separate target for each VM; but a single target that contains all the LUNs would probably greatly simplify management... but we may need hundreds of LUNs per a single target. (And then possibly tens of initiator connections to that target)

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  • how to offer subdomain hosting with bandwidth calculation per user

    - by Ke
    Hi, Im a php developer and I would like to offer subdomain hosting,but need also to be able to calculate bandwidth for each subdomain. For the subdomains creation I will use catch-all and wildcards etc to easily set these up. The one thing im a bit stumped on is how to calculate bandwidth for each subdomain, is this possible within php? or are there better solutions for this perhaps using folders or something? Also a script will be loaded under the subdomain, this will vary per user. Is it worth giving each user a new folder and their own script, or more easy to manage one script for all users? Any considerations here? Cheers Ke

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  • Linux (non-transparent) per-process hugepage accounting

    - by Dan Pritts
    I've recently converted some java apps to run with linux manually-configured hugepages. I've got about 10 tomcats running on a system and I am interested in knowing how much memory each one is using. I can get summary information out of /proc/meminfo as described in Linux Huge Pages Usage Accounting. But I can't find any tools that tell me about the actual per-process hugepage usage. I poked around in /proc/pid/numa_stat and found some interesting information that led me to this grossity: function pshugepage () { HUGEPAGECOUNT=0 for num in `grep 'anon_hugepage.*dirty=' /proc/$@/numa_maps | awk '{print $6}' | sed 's/dirty=//'` ; do HUGEPAGECOUNT=$((HUGEPAGECOUNT+num)) done echo process $@ using $HUGEPAGECOUNT huge pages } The numbers it gives me are plausible, but i'm far from confident this method is correct. Environment is a quad-CPU dell, 64GB ram, RHEL6.3, oracle jdk 1.7.x (current as of 20130728)

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  • Per process I/O accounting on AIX

    - by ipozgaj
    Is there a way of getting per process I/O statistics on AIX, i.e. to get current disk I/O rate of a process? Commands like iostat, nmon, topas etc. can't display such data. Filemon also doesn't help. Actually, what I would need is something much like iotop(1) command on Linux. Update: it seems there is no builtin command(s) to do this. I will most probably make my own by using the SPMI API.

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  • Setting per-directory umask using ACLs

    - by Yarin
    We want to mimic the behavior of a system-wide 002 umask on a certain directory foo, in order to ensure the following result: All sub-directories created underneath foo will have 775 permissions All files created underneath foo and subdirectories will have 664 permissions 1 and 2 will happen for files/dirs created by all users, including root, and all daemons. Assuming that ACL is enabled on our partition, this is the command we've come up with: setfacl -R -d -m mask:002 foo This seems to be working- I'm basically just looking for confirmation. Is this the most effective way to apply a per-directory umask with an ACL?

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  • Alien: .rpm -> .deb | Compability / Built per system?

    - by MaddinXx
    At the moment I'm playing a bit with alien (for OpenVZ packages on Debian) and was wondering myself about one question for which I was not able to find an answer anywhere. Therefor I thought it might be smart to ask here :) The question is... If I convert a .rpm to .deb on a system, how compatible is this .deb package? What do I mean? Will the .deb be working on other systems as well or is it per-system, e.g. that on every system the .deb package will be little different? That i386 and x86_64 are different is clear, so this doesn't need to be answered :) Examples that would be nice to know are for example: .deb built on Debian 6 64-bit - Ubuntu 12.04 64-bit (compatible?) .deb built on Debian 6 64-bit - Debian 5 64-bit (compatible?) etc. Thanks anyone reading this / helping me! Regards, Michel

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  • Per-user vhost logging

    - by kojiro
    I have a working per-user virtual host configuration with Apache, but I would like each user to have access to the logs for his virtual hosts. Obviously the ErrorLog and CustomLog directives don't accept the wildcard syntax that VirtualDocumentRoot does, but is there a way to achieve logs in each user's directory? <VirtualHost *:80> ServerName *.example.com ServerAdmin [email protected] VirtualDocumentRoot /home/%2/projects/%1 <Directory /home/*/projects/> Options FollowSymlinks Indexes IndexOptions FancyIndexing FoldersFirst AllowOverride All Order Allow,Deny Allow From All Satisfy Any </Directory> Alias /favicon.ico /var/www/default/favicon.ico Alias /robots.txt /var/www/default/robots.txt LogLevel warn # ErrorLog /home/%2/logs/%1.error.log # CustomLog /home/%2/logs/%1.access.log combined </VirtualHost>

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