General :: 64 Bit - Performance Hit Using 32 Bit On A 64 Bit CPU?

Jun 25, 2010

I'm running 32 bit Ubuntu 10.04 with 2GB RAM. Is my processor (AMD Athlon 64 X2) running sub-optimally?Given that a larger addressing space will make no difference to me (right now) would there be a performance gain or any other advantage to switching to 64 bit Ubuntu.

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Ubuntu :: Ondemand Vs Performance - Increases The Clock Speed To Performance When The CPU Is Under Load

Jul 31, 2010

I just wanted to know if having my laptop set to ondemand, will this affect performance in any way? I realize it increases the clock speed to performance when the CPU is under load, but does the time it take to go from ondemand to performance affect speed? Will there be any noticeable difference between the two setups? I have a dual core intel at 2.2GHz when in performance. When ondemand is set with no load it downclocks to 800Mhz.

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General :: How To Measure Synchronization Performance

Jul 9, 2010

I'm looking for a tool for Debian Linux that can measure the synchronisation performance between two desktops.

I'm using RADClock instead of the NTP client to synchronise my desktops.

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General :: Efi And Bootloaders And Any Performance Advantage?

Apr 24, 2011

Modern systems seem to be EFI based, and while there's a specific version of lilo that works with it, i can't seem to find any mention of a efi varient of grub (edit - on modern debian derivative systems there's grub-efi. Most references to it seem to be about various bugs in/for it tho) . In general, how well is EFI supported on linux?In addition, apparently windows 7 uses EFI to enable faster boot - 12 seconds or so with some systems. While a properly tweaked linux system could probably come close, are there any enhancements to the linux booting procedure that take advantage of EFI?

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General :: Best OS To Install Nessus On For Performance?

Aug 26, 2011

I have a machine that I want to install Nessus on it.
Nessus supports many Operating Systems:
Microsoft Windows
Mac OS X
Linux
FreeBSD

The full list is here: [URL]... What would the best OS to install Nessus on for performance be?

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General :: Can A Ramdrive Be Used To Speed Up Performance

Feb 1, 2011

I have recently upgraded to a M4A77TD motherboard and 8Gig of memory.I have a AMD Athlon(tm) II X4 645 Processor, and I cant say that I see much improvement over the one that died. I have noticed that the HDD light is constantly flashing so I wondered if I couldnt use some of the Ram to create a ramdrive to speed things up . So ..my question ... what should I put on my ramdrive? My own thoughts were the var and usr directories. I would load the ramdrive at startup (which would slow down my startup) And Rsync back again on shutdown.Has anyone done this? Ive had a look through the forum but cant see anything ..but my search terms may not be all that good.

suse linux 11.1 64 bit
var=0.3G usr=5M lib=0.2G opt=0.6G sys=0.6G
As far as I can see swop is never used

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General :: Does Performance Gain Is Noticeable Regarding Gcc

May 8, 2011

Does anyone here has any experience with the proprietary compilers? OpenWatcom, Intel and Pathscale? Does the performance gain is noticeable regarding the gcc...?In number crunching applications, i may say that ifort/ icc/ mkl yeld faster binaries than gcc.has anyone here already tinkered with OpenWatcom/PathScale...?

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General :: What Is High Performance Computing And Its Uses

Jun 8, 2011

what is High Performance computing and its uses.

what is active active and passive passive cluster ?

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General :: Improve The Performance Of Script ?

Feb 15, 2011

I have written a script as follows which is taking lot of time in executing/searching only 3500 records taken as input from one file in log file of 12 GB Approximately. Working of script is read the csv file as an input having 2 arguments which are transaction_id,mobile_number and search the log file having these two strings with one more static string that is "CustomCDRInterceptor",then format the searched data in prescribed format.

Code of script written is as follows:

Code:

Sample data of input file will be like :

Code:

Sample Data in log file is as follows:

Code:

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General :: Run Firefox Jailed Without Serious Performance Loss?

Feb 20, 2011

My Firefox configuration is tricky:

Firefox runs at separate restricted user account which cannot connect to main X server.

Firefox uses Xvfb (virtual "headless" X server) as X server.

x11vnc is running on that Xvfb.

On the main X server there is vncviewer running that connect to this x11vnc

On powerful laptop (Acer Extensa 5220) it seems to work more or less well, but on "Acer Aspire One" netbook it is slowish (on a background that firefox is loaded with lots of extensions).How to optimise this scheme? Requirements:

Browser cannot connect to main X server.

Browser should be in chroot jail (no "suid" scripts, readonly for many things)

Browser should have a lot of features (like in AutoPager, NoScript, WoT, AdBlockPlus)

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General :: Improve Performance Of Mplayer With Libcaca?

Mar 18, 2011

I'm using mplayer and libcaca on Gentoo. My framebuffer (uvesafb) is running at 1920x1200 (I don't know how many characters that is) and mplayer has problems filling up the screen, so video and audio lose synchronization.

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General :: Video Card Performance Monitoring?

Jan 19, 2010

Is there a 'top' like command for monitoring the GPU and memory usage of a video card? I am most interested in Linux commands, but and OS would be interesting. I strongly suspect that for a group of my systems the video cards are being under-utilized (but I have no idea by how much) and would like to re-allocate funds to other bottle-necks. We are using higher end cards, so the price difference between cards is significant.

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General :: Best Way To Test Graphics Card Performance?

Apr 9, 2010

I've recently been experimenting with glxgears, but found people saying this is not an ideal benchmark tool as there are many variants; for example resizing the window affects the FPS tremendously.

I'm interested in testing the difference between using the proprietary ATI driver and the open source driver and also the performance under various distributions.

What's the best software to benchmark graphics cards?

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General :: Disk Performance Slower After Upgrade To 4GB RAM

Oct 19, 2010

I am running openSuse 11.2 (32-bit), my CPU only supports 32-bits. I have a hardware RAID device. My system has 4GB of RAM. When I configure my system to only use 3GB, 2GB, or even 1GB, using mem=1024M in grub, my RAID performance is much better then when letting my system use the default 4GB available.Can anyone explain to me why this is? Is there anything I can do, i.e. kernel configuration, that will help performance when running with all 4GB enabled?

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General :: Hard Drive Partitioning Vs Performance

Mar 3, 2011

if I make more partitions rather than creating single one, will I get more data access performance? E.g Instead of keeping 1,5TB partition, create 5x300MB and keep different data in different partitions? Logically hard drive will spend less time on finding data in smaller partition then in bigger one, right? Is there any statistics for performance vs size?

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General :: Difference In Performance Between X86 And Amd64 Distros?

Sep 7, 2010

I have a 64-bit computer but 64-bit distros have been giving me huge problems when using 32 bit apps or trying to install 32-bit libraries, so I think I'm going to just switch to 32 bit. Will I notice much of a hit in performance? This computer is mostly used for web and games, nothing particularly cpu-intensive (no graphics rendering, etc)

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General :: Nagios Performance Graphing OPMON

Jul 14, 2010

I ahve installed Nagios 3.2.1 and to generate performance graphs i am trying to use opmon [URL] there are three utilities required to generate graphs: I have installed all prerequisites successfully.

opcfg
opcp
opdb

Here i have installed opcfg successfully and working good, For opcp requirement is "opdb" but no proper documentation available. But while compiling opdb from command

gcc -D_GNU_SOURCE -Wall -shared -o opdb.o opdb.c -L/usr/lib/mysql -lmysqlclient -DNSCORE

Its giving error: Please see attached file For thsi also no proper documentation available.

is there any other easy way to generate performance graphs from Nagios.

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General :: Low Performance, GeForce GTS 250 Dark Knight?

Sep 25, 2010

I need someone to please point me in the right direction with this. I'm using a supposedly nice graphics card under Ubuntu 9.10, an Asus GeForce GTS 250 1GB Dark Knight, and I think I'm getting a poor performance out of it. I realized this when "backing up" some movies I have on DVD and took more than 30 min with k9copy for each DVD.

The CPU is a AMD Phenom II 955 X4 Quad Core 3.2Ghz Black Ed. 125W AM3. Which I think is powerful enough for not to be a bottleneck. Maybe there is nothing wrong with the graphics card and the bottleneck is somewhere else. I provably should benchmark my system to find out if I'm not taking advantage of my hardware. I've seen phoronix has a test suite. Any other recommendations?

[Code]...

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General :: Performance Analysis Of Tora Protocol

Jun 4, 2011

I am making comparison between tora , dsr , dsdv and aodv. There is some error in tora.tcl protocol. Rest is working fine..why the tora.tcl is popping the error?

Error is given below:-
Code:
num_nodes is set 6
INITIALIZE THE LIST xListHead
(_o22 cmd line 1)
invoked from within
"_o22 cmd port-dmux _o37"
invoked from within
"catch "$self cmd $args" ret"
invoked from within
"if [catch "$self cmd $args" ret] {
set cls [$self info class]
global errorInfo
set savedInfo $errorInfo
error "error when calling class $cls: $args" $..." .....

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General :: How To Handle System Performance Matters

Jul 11, 2010

I attended many interviews for Linux Admin post. Most of them asked me a common question 'How do you handle System Performance Issues' on a Linux Server. Now how do I answer this?

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General :: Performance - Best Available Technology For Layered Disk Cache

Oct 17, 2010

I've just bought a 6-core Phenom with 16G of RAM. I use it primarily for compiling and video encoding (and occassional web/db). I'm finding all activities get disk-bound and I just can't keep all 6 cores fed. I'm buying an SSD raid to sit between the HDD and tmpfs. I want to setup a "layered" filesystem where reads are cached on tmpfs but writes safely go through to the SSD. I want files (or blocks) that haven't been read lately on the SSD to then be written back to a HDD using a compressed FS or block layer.

So basically reads:
- Check tmpfs
- Check SSD
- Check HD

And writes: - Straight to SSD (for safety), then tmpfs (for speed) And periodically, or when space gets low: - Move least frequently accessed files down one layer. I've seen a few projects of interest. CacheFS, cachefsd, bcache seem pretty close but I'm having trouble determining which are practical. bcache seems a little risky (early adoption), cachefs seems tied to specific network filesystems. There are "union" projects unionfs and aufs that let you mount filesystems over each other (USB device over a DVD usually) but both are distributed as a patch and I get the impression this sort of "transparent" mounting was going to become a kernel feature rather than a FS.

I know the kernel has a built-in disk cache but it doesn't seem to work well with compiling. I see a 20x speed improvement when I move my source files to tmpfs. I think it's because the standard buffers are dedicated to a specific process and compiling creates and destroys thousands of processes during a build (just guessing there). It looks like I really want those files precached.....

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General :: Allocate Limited SSD Space In LVM For Optimal Performance?

Jan 20, 2011

I just got a new SSD, and I'm looking for advice on how best to incorporate it into my existing LVM setup. I have the following logical volumes (mounted at the obvious places):

[Code]...

I've got 108.26g in the physical volumes associated with the new SSD. I'm going to use pvmove to migrate some of these LVs to the SSD. The question is, which LVs to move?

The machine in question is basically a home workstation. I do some light development (source code lives in home), run some very low-load server processes (apache, etc.), and do a bit of image and video editing from time to time. I run Gentoo on x86 if that makes a difference.

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General :: Performance With Software RAID5 And LUKS Encryption?

Jul 3, 2011

I have set up a Linux software RAID5 on three hard drives and want to encrypt it with cryptsetup/LUKS. My tests showed that the encryption leads to a massive performance decrease that I cannot explain. The RAID5 is able to write 187 MB/s [1] without encryption. With encryption on top of it, write speed is down to about 40 MB/s.

The RAID has a chunk size of 512K and a write intent bitmap. I used -c aes-xts-plain -s 512 --align-payload=2048 as the parameters for cryptsetup luksFormat, so the payload should be aligned to 2048 blocks of 512 bytes (i.e., 1MB). cryptsetup luksDump shows a payload offset of 4096. So I think the alignment is correct and fits to the RAID chunk size.

The CPU is not the bottleneck, as it has hardware support for AES (aesni_intel). If I write on another drive (an SSD with LVM) that is also encrypted, I do have a write speed of 150 MB/s. top shows that the CPU usage is indeed very low, only the RAID5 xor takes 14%.

I also tried putting a filesystem (ext4) directly on the unencrypted RAID so see if the layering is problem. The filesystem decreases the performance a little bit as expected, but by far not that much (write speed varying, but > 100 MB/s).

Summary:
Disks + RAID5: good
Disks + RAID5 + ext4: good
Disks + RAID5 + encryption: bad
SSD + encryption + LVM + ext4: good

The read performance is not affected by the encryption, it is 207 MB/s without and 205 MB/s with encryption (also showing that CPU power is not the problem). What can I do to improve the write performance of the encrypted RAID?

[1] All speed measurements were done with several runs of dd if=/dev/zero of=DEV bs=100M count=100 (i.e., writing 10G in blocks of 100M).

Edit: If this helps: I'm using Ubuntu 11.04 64bit with Linux 2.6.38. Edit2: The performance stays approximately the same if I pass a block size of 4KB, 1MB or 10MB to dd.

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Ubuntu :: Slow Scrolling And General Performance In Browser?

Jul 21, 2010

I have this problem. It seems like a new problem to me, but maybe it isn't. When I scroll in web browsers its really slow and erratic but when I'm in nautilus is fine. What could the problem be?

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General :: Copying And Moving Operations And Their Performance Differences?

Oct 13, 2010

[code]...

Well, let's suppose the file is very large, say 10 GB of disk space it is consuming. We perform the above steps. Which operations: cp (copying) or mv (moving) will be more efficient and less time consuming? The inode number 1566966 which was pointing to the file in my home directory is now pointing to the same file which is in some other directry, i.e. /tmp/. Isn't the inode value getting modified in some ways to point to the correct location / beginning of the data block on the hard disk? If the the physical location of the data would not change then we would not be able to free up space in our home directory. That means the mv operation is copying the file into some other location. In other words, it is also performing the cp operation first and then deleting the file from its original location, my home directory in the case above. However, when a file is copied it's inode value changes. But the mv operation is retaining the same indoe value. So, how to determine which operation - mv or cp - is more CPU-friendly or more efficient in terms of performance and time taken to perform the action?

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General :: CPU Comparison - Trusted Source That Compares Performance?

Dec 5, 2010

How to compare CPUs? Is there a trusted source that compares cpu performance?

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General :: Does Scheduled Reboot Of Server Improve Performance?

Nov 12, 2009

I just want to know if a linux server got rebooted after a scheduled time(2/3 month), whether the performance improves. If improves why.

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General :: Command For Checking The Network Performance And Status?

Jun 15, 2010

what is the command for checking the network performance and status?

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General :: Gnome-panel In Fluxbox - Performance Degrades?

Nov 28, 2010

I'm toying around with fluxbox and like it's speed and simplicity. However, the gnome-panel is great and I would like to use it in fluxbox. Specifically, I like its system monitor, typing break, gnubiff and clock (which world clock support). My question is: if I'm running the gnome-panel in fluxbox will this degrade performance, for example, since the gnome-panel needs to load all the gnome related libraries etc.? One of the main reasons I'm looking into fluxbox is for speed so I don't want to lose that just because of the panel.

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General :: Storage System - Disk Performance Check?

Aug 12, 2010

I have doubts regarding storage:
How to configure the Events of Storage Processor?
What are performance issues will come daily in a critical production server?
What are first steps for disk performance Check?
What are first steps for Storage Processor performance Check?
What are first steps for MetaLUN performance Check?

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