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  • ZFS recordsize for VirtualBox and other virtual disks

    - by JOTN
    Has anyone run across any good benchmarks or other research on tuning the ZFS recordsize when putting virtual disk files on it for a guest OS? I'm using VirtualBox at the moment. I have notice significant performance improvement when working with a DBMS by setting the ZFS recordsize to the same as the DB blocksize, so I'm guessing matching the blocksize of the guest filesystem would also be a good idea.

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  • How does virtualization improve server utilization?

    - by Continuation
    The biggest benefit of virtualization is usually said to be improved server utilization. But why do I need virtualization for that? Say I got N physical servers that are lightly used. Why don't I just combine all the apps on those N servers into 1 physical server? This way I don't incur the performance penalty of virtualization. What does virtualization buy me in this case?

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  • Windows 2003 X64 Std page file usage

    - by duhaas
    Just trying to understand why I'm seeing what I'm seeing on this system. Pagefile performance counters are telling me i'm @ about 1.5% used with my page file, settings for the file are 2GB-4GB, but task manager was showing 13GB usage: Oddly enough, it just sunk down: This machine has IBM DB2 9.5 workgroup edition running on it. Thoughts??? Actually, just learned the developer had just stopped DB2, hence the huge drop, just not understand the difference in the PF usage in task manager vs perf counters?

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  • My way of Comparing CPUs

    - by abbasi
    There are many types of CPUs, like Pentiume, Atom, core 2 duo, core iX (X = 3,5, ....), But I always don't look at them this way! I always look at their speed which in GHZ unit and then compare them with each other. For example when some CPU is in type of 'X' with 2 GHZ of speed and another one is in type of 'Y' with 2.2 GHZ of speed, I say the second one ('Y') has better speed and also better performance. Is it a correct way? Thanks

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  • How Can I Map IIS on My PC with Static IP to my Domain Name?

    - by Subhen
    Hi, Now I have got an internet connection with Static Ip. I want to know How can I map my website to my Static IP(Received from ISP). I know this is not a good Idea for Security and Performance issues, But just Wanted to know as I can set up a test Project. Again, Can't I just by a domain name and map it to my Static Ip, instead of buying them from WebHosting Providers. Now I have bought the space from bizzhost and hosted my site by setting the Name Server. Thanks, Subhen

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  • VMware ESXi VMI Paravirtualization vs 64-bit OS

    - by netvope
    VMware ESXi 4 supports VMI paravirtualization for 32-bit OS but not for 64-bit OS. For performance consideration, is it better to use a 32-bit Ubuntu Server guest without paravirtualization or a 64-bit one with VMI paravirtualization? Hardware: Core 2 Quad, 8 GB RAM Workload: Software development/testing, webserver, database

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  • High CPU usage - symptoms moving from server to server after bouncing

    - by grt3kl
    First off, I apologize if I didn't include enough information to properly troubleshoot this issue. This sort of thing isn't my specialty, so it is a learning process. If there's something I need to provide, please let me know and I'll be happy to do what I can. The images associated with my question are at the bottom of this post. We are dealing with a clustered environment of four WebLogic 9.2 Java application servers. The cluster utilizes a round-robin load algorithm. Other details include: Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_12-b04) BEA JRockit(R) (build R27.4.0-90_CR352234-91983-1.5.0_12-20071115-1605-linux-x86_64, compiled mode) Basically, I started looking at the servers' performance because our customers are seeing lots of lag at various times of the day. Our servers should easily handle the loads they are given, so it's not clear what's going on. Using HP Performance Manager, I generated some graphs that indicate that the CPU usage is completely out of whack. It seems that, at any given point, one or more of the servers has a CPU utilization of over 50%. I know this isn't particularly high, but I would say it is a red flag based on the CPU utilization of the other servers in the WebLogic cluster. Interesting things to note: The high CPU utilization was occurring only on server02 for several weeks. The server crashed (extremely rare; we are not sure if it's related to this) and upon starting it back up, the CPU utilization was normal on all 4 servers. We restarted all 4 managed servers and the application server (on server01) yesterday, on 2/28. As you can see, server03 and server04 picked up the behavior that was seen on server02 before. The CPU utilization is a Java process owned by the application user (appown). The number of transactions is consistent across all servers. It doesn't seem like any one server is actually handling more than another. If anyone has any ideas or can at least point me in the right direction, that would be great. Again, please let me know if there is any additional information I should post. Thanks!

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  • Stop windows 7 disk trashing when idle

    - by Konrads
    Hello, I installed Windows 7 on VMWare and it works just fine! However, when I leave the machine idling and work on my host OS, Windows 7 decides that it is a good idea to trash disk and kill performance. How do I disable these background processes? is it just indexer?

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  • Stop windows 7 disk trashing when idle

    - by Konrads
    Hello, I installed Windows 7 on VMWare and it works just fine! However, when I leave the machine idling and work on my host OS, Windows 7 decides that it is a good idea to trash disk and kill performance. How do I disable these background processes? is it just indexer?

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  • What's the difference between DisplayPort, DVI and HDMI?

    - by Leo Bushkin
    As an end consumer, are there any significant differences between the newer DisplayPort interface and DVI/HDMI that I should be aware of? I realize they are different connector types and require compatible equipment, I'm primarily interested in whether there are functional or performance benefits of one technology over another. Should I have a preference for one technology or another on newer video card equipment?

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  • Windows 7: The audio service is not running?

    - by oscilatingcretin
    Why isn't my audio service running? It's so random. Sometimes I am able to change my PC volumn, other times I am not. I've restarted the following services: Remote Procedure Call (RPC) Multimedia Class Scheduler Windows Audio Endpoint Builder I think I started noticing this after I went mucking around in msconfig looking for ways to improve PC performance. I know I shut off some services, but that was over 6 months ago today and I am finally getting tired of it happening.

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  • How to get the MongoDB' current working set size

    - by Howard
    From the doc , it said "For best performance, the majority of your active set should fit in RAM." So for example, my db.stats() give me { "db" : "mydb", "collections" : 16, "objects" : 21452, "avgObjSize" : 768.0516501957859, "dataSize" : 16476244, "storageSize" : 25385984, "numExtents" : 43, "indexes" : 70, "indexSize" : 15450112, "fileSize" : 469762048, "ok" : 1 } Which value is the working set size?

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  • Is it possible/advisable to run VMware Server ESX/ESXi on a laptop?

    - by cletus
    The idea of having a small footprint hypervisor as the primary OS on a laptop or desktop where every "real" OS is a guest appeals to me. Now I realize this software is more typically used on blades and the other servers but can it be done on a normal PC? Should it be? What requirements are there (eg hardware/BIOS/chipset)? Is there a performance impact for doing so? Is it a good/bad idea?

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  • What are some general tips to make InnoDB for MySQL perform at its highest?

    - by James Simpson
    I've been using MyISAM exclusively for several years now and know the ins-and-outs pretty well of how to optimize it, but I've just recently started using InnoDB for some of my tables and don't know that much about it. What are some general tips to help improve the performance of these InnoDB tables (they were converted from MyISAM and have anywhere from 100k - 2M rows and most won't use transactions).

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  • Why is my computer using so much ram?

    - by Ian
    I have 16gb of ram installed in my computer, and nearly 70% of it is used at all times. Looking at the processes in task manager the memory being used with everything in there doesn't even add up to 2gb. I have RAPID mode enabled on my ssd which may be using 2gb at most so I would understand that. I am thinking there might be a memory leak somewhere, but I don't really know how I would be able to tell. My performance and process list is below:

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  • Oracle Virtualbox on statically compiled kernel

    - by aking1012
    I can't seem to find any documentation on the subject. I'm working on putting together a linux install for a fairly "dirty" environment. Best practice there would be a statically compiled kernel with no module support. I can already do the customizations to strip out unnecessary drivers/etc to get the performance and disable module support. Does anyone have a link or any ideas on how to get the Oracle Virtualbox module (not the OSE one, I need USB passthrough) compiled in?

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  • Get statistics on how ReadyBoost is being used by Windows

    - by TomA
    I have experimentally started using a flash drive for ReadyBoost. There's no blinking light on it so I don't even know if it's being accessed at all. Is there some way to get statistics on how often or how well Windows actually uses the drive to improve performance? Something like numbers of cache hits/misses or something...

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  • Top - what does Virtual memory size mean? ...linux/ubuntu

    - by user42159
    I am running Top to monitor my server performance and 2 of my java processes show virtual memory of upto 800MB-1GB. Is that a bad thing? What does virtual memory mean? And oh btw, I have swap of 1GB and it shoes 0% used. So I am confused. Java process = 1 Tomcat server + my own java deamon Server = Ubuntu 9.10 (karmic)

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  • Safe to disable compile options for Nginx (when used only as reverse proxy/cache)

    - by Alex
    I have read that I can do this to make a smaller footprint Nginx when used as static content cache/reverse proxy: --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module What other options are safe to disable? SSI, FastCGI? Others? The only requirements for the reverse proxy is to be able to do https and gzip compression. Will disabling all the module really help with footprint and/or performance?

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