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• Benchmarks for Single and MultiThreaded programs

  - by user280848

  Hi I am trying to compare the performance of Single and Multithreaded Java programs. Are there any single thread benchmarks which are available which I could then use and convert to their multithreaded version and compare the performance. Could anybody guide me as to what kind of programs(not very small) are suitable for this empirical comparison. Thanks in advance

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• How to preserve sysprep from changing Default User settings

  - by user33794

  I'm having diffculties configuring 20 new Dell Vostro minis here. I set up one of them with my preferred OS, applications and settings, especially the Visual Effects Settings of Windows XP. I set them to best performance and deactivated everything else in the box. I copied this profile to Default User Profile and did sysprep -mini -reseal. After capturing this image and deploying it again, the desktop settings are correct except the visual effects settings. fading and everything else is reenabled for each new user which is created on the system. How do I preserve my settings from being overwritten by sysprep? thanks!

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• Benchmarking MySQL on win7

  - by Patrick

  I've setup a nginx server running php 5.3.6 and mysql 5.5.1.3. My computer is an AMD quadcore 9650, 4gb ram, 500gb 7200rpm HD. I ran the PHP MySQL Benchmark Tool v. 0.1, and got the following results: Testing a(n) MYISAM table using 100000 rows. Successfully created database speedtestdb Sucessfully created table speedtesttable Table Type Verified: MYISAM .. Done. 100000 inserts in 19.73628 seconds or 5067 inserts per second. Done. 100000 row reads in 0.2801 seconds or 357015 row reads per second. Done. 100000 updates in 4.03876 seconds or 24760 updates per second. I'm wondering where this stands as far as performance goes, and what are some steps I can take if any to improve on this. I'm not trying to make anything fantastic, just getting a feel for how to best optimize a web server in this configuration.

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• CORAID using only 1 of the 2 available NICs for AoE traffic

  - by Peter Carrero

  We got 6 CORAID shelves in my workplace. On 2 of them I see AoE traffic on only 1 of the 2 NICs that are attached to the SAN switch. We got jumbo frames enabled on all devices. Both NICs show up when I issue the aoe-interfaces command. This wouldn't bother me too much if the throughput performance observed on the "bad" shelves using bonnie++ wasn't half of the result of the "good" shelves. The "good" shelves are older SR1521 model and they have ReiserFS on their LUNS - not that I think it makes a difference - and the "bad" shelves are newer SR2421 model and have JFS. Any help as to what is going on and how to rectify this would be greatly appreciated. BTW: even the lower performing shelves outperform another iSCSI device we got, but that is another story... Thanks.

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• The difference between desktop-series HDD drives and server-series

  - by FractalizeR

  Hello. What are the main differences between desktop-series hard disks and server-series? The obvious things I can see are: durability (server hardware mostly more qualitative and have more warranty) and power consumption (server hardware more focused on performance, than on power economy). Also server disks are usually a little faster, but it seems, that it is not always the case. May be there are some other reasons, that make you choose server-oriented series (Seagate ES drives, for example) over desktop-oriented ones (Seagate Barracuda series)? What are they?

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• Install 64-bit Ubuntu or 32-bit?

  - by nitbuntu

  I'll be receiving a new notebook in a few days and was planning on running Ubuntu on it as it's compatible and the notebook has no OS pre-installed. The specifications are: Core 2 Duo, T6600, 4 GB RAM, Intel integrated graphics. I know a year or two ago, running a 64-bit version of Ubuntu was not advised due to much of the applications and plugins (e.g. Flash) only running on 32-bit. Is this still the case? Would I get better performance with 64-bit Ubuntu since I have 4 GB of RAM? Are there any downsides anymore?

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• eSata plugged into Sata socket via adaptor cable very slow

  - by Jon

  Why would an external eSata Drive (xSonic with 500Gb notebook Hard Drive) run ok on a Silicon Image based PCI-E to eSata adaptor at about 35MB/s, But then run really slow when plugged into NForce4 Sata socket via cable? I have another version of the problem with Really slow 1MB/s!!! performance on a ASUS P5K Pro Motherboard with E8400 CPU. This time the same card is plugged into a PCI-E socket. The same eSata drive is plugged into the Esata port on the card. All this is running on Windows XP Pro 32bit. Any suggestions on how to diagnose the problems??

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• How do I convert a Linux disk image into a sparse file?

  - by endolith

  I have a bunch of disk images, made with ddrescue, on an EXT partition, and I want to reduce their size without losing data, while still being mountable. How can I fill the empty space in the image's filesystem with zeros, and then convert the file into a sparse file so this empty space is not actually stored on disk? For example: > du -s --si --apparent-size Jimage.image 120G Jimage.image > du -s --si Jimage.image 121G Jimage.image This actually only has 50G of real data on it, though, so the second measurement should be much smaller. This supposedly will fill empty space with zeros: cat /dev/zero > zero.file rm zero.file But if sparse files are handled transparently, it might actually create a sparse file without writing anything to the virtual disk, ironically preventing me from turning the virtual disk image into a sparse file itself. :) Does it? Note: For some reason, sudo dd if=/dev/zero of=./zero.file works when cat does not on a mounted disk image.

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• Do Seagate Momentus XT SSD Hybrid drives perform better than a good hard drive + flash on ReadyBoost

  - by Chris W. Rea

  Seagate has released a product called the Momentus XT Solid State Hybrid Drive. At a glance, this looks exactly like what Windows ReadyBoost attempts to do with software at the OS level: Pairing the benefits of a large hard drive together with the performance of solid-state flash memory. Does the Momentus XT out-perform a similar ad-hoc pairing of a decent hard drive with similar flash memory storage under Windows ReadyBoost? Other than the obvious "a hardware implementation ought to be faster than a software implementation", why would ReadyBoost not be able to perform as well as such a hybrid device?

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• How to monitor current output/receive queue length in Linux

  - by IZhen

  I want to check the capacity and performance of my network. Besides checking the txkB/s and rxkB/s via Sar, I'd also like to see the average queue length of the network interface(so that the average queueing time in the interface can be calculated). It seems that netstat can give a per socket queue length, is it possible to get a per interface statics(a bit like Network Interface\Output Queue Length in Windows)? A related and kind of reverse questions is How do I view the TCP Send and Receive Queue sizes on Windows? Thanks

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• Full Screen Flash is choppy (nVidia GeForce 8200M)

  - by Joel Martinez

  I have a new compaq presario laptop (I asked SU for advice before I bought it :-) ). It has a nVidia GeForce 8200M video card. When I try to play a flash video full screen, it plays really choppy. This is a brand new computer and is well more powerful than my previous computer so I know it's not a matter of the full screen being too processor intensive to play, or a bandwidth problem. Even playing HD hulu videos full screen was fine on my previous laptop. Any advice on how to get better performance here? edit: World Of Warcraft is able to play at a great framerate, so this machine should definitely be able to handle a simple little flash video ;-)

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• How to increase hard drive transfer speed

  - by atif089

  This is my motherboard GA-M61PME-S2 (SATA upto 3.0 Gbps) and This is my Hard Disk Samsung hd502hi Capacity 500 GB Cache 16MB Disks / Heads 1 / 2 Interface SATA 3Gb/s Spindle Speed 5400 RPM Sustained Data Rate OD 100 MB/s Average Seek 8.9 ms Average Latency 5.56 ms Data Transfer Rate 300 MB/sec Weight 470 grams Power: Idle / Seek / R-W / Spin-up 3.9W / 4.8W / 5.1W / ~24W Acoustics (sound power) 2.2 / 2.7 Bel (idle / quiet seek / performance seek) When I copy things from one partition to another they transfer at a maximum of 30 MBps. However the drive supports upto 300 MBps right ? How do I increase the transfer speeds? P.S - Using Windows XP, All partitions are NTFS.

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• Ubuntu server very slow out of the blue sky (Rails, passenger, nginx)

  - by snitko

  I run Ubuntu server 8.04 on Linode with multiple Rails apps under Passenger + nginx. Today I've noticed it takes quite a lot of time to load a page (5-10 secs). And it's not only websites, ssh seems to be affected too. Having no clue why this may be happening, I started to check different things. I checked how the log files are rotated, I checked if there's enough free disk space and memory. I also checked IO rate, here's the output: $ iostat avg-cpu: %user %nice %system %iowait %steal %idle 0.17 0.00 0.02 0.57 0.16 99.07 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvda 2.25 39.50 16.08 147042 59856 xvdb 0.00 0.05 0.00 192 0 xvdc 2.20 25.93 24.93 96530 92808 xvdd 0.01 0.12 0.00 434 16 xvde 0.04 0.23 0.35 858 1304 xvdf 0.37 0.31 4.12 1162 15352 Rebooting didn't help either. Any ideas where should I be looking?

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• 4096 and 8192 block size read slower than write? by using lsi 9361-8i RAID10

  - by Min Hong Tan

  is it possible that 1024 and 2048 block size read speed is faster than 4096 and 8192 block? I'm using lsi 9361-8i with RAID 10 , with 8 x Kingston E50 250G. result: 1024 = Write: 2,251 MB/s Read: 2,625 MB/s 2048 = Write: 2,141 MB/s Read: 3,672 MB/s 4096 = Write: 2,147 MB/s Read: 231 MB/s 8192 = Write: 2,147 MB/s Read: 442 MB/s is there any possible? and below is the reading when i simply want to test out the RAID 10 function and disaster test by taking out one of the 250G harddisk. the result is different like below: Result: 1024 = Write: 825 MB/s Read: 1,139 MB/s 2048 = Write: 797 MB/s Read: 1,312 MB/s 4096 = Write: 911 MB/s Read: 1,342 MB/s 8192 = Write: 786 MB/s Read: 1,204 MB/s and the result for 4096 and 8192block are different? can any one explain to me is it normal? or I need to do some tuning/configuration? will it affect my host linux performance?

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• Partimage and autocheck problem when restoring Windows XP from image

  - by Xolstice

  I'm trying to create an image of Windows XP and clone it to several partitions on the same hard drive using Partimage. I seem to be running into a problem when I restore the image onto another partition - when I boot into the OS from the partition I just restored, it brings up this message during the boot sequence: autochk program not found - skipping autocheck, and then after this, the OS reboots the PC and the whole process repeats itself in an infinite loop. After doing some Google search, it is suggested that this loop was caused by the partition being hidden or the mountmgr.sys file is missing. I checked my configuration and verified that this was not the case. I'm just wondering: Has anyone else experienced this and is there a solution for it? Is this what happens when you try to restore the image to a different partition on the same hard disk or is Partimage itself the problem? Should I be trying out a different partition cloning software?

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• Will a database server perform better running on 2 CPUs with 16 cores or 4 CPUs with 8 cores?

  - by AlexOdin

  What I have: an online financial application (ASP.NET, C#) at peak we have 5K+ simultaneous users backend is running on Oracle 11g (active server + stand-by using Active Data Guard). At peak - 4K-5K database sessions Oracle is installed on Linux 5.8 (Oracle's unbreakable version) the database size: 7TB disk storage: NetApp (connected with 10GB network) I would like to replace old servers (IT will purchase HP blades BL685C). Servers will have 256GB of RAM. I need your help to figure out what to do with CPUs and cores. Options: 2 CPUs (2.3 GHz) with 16 cores each 4 CPUs (3.0 GHz) with 8 cores each Question: Which one should I pick? P.S. Next year, we will migrate from Oracle to SQL server. I hope, whatever option you recommend will work for both platforms

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• High CPU usage on Linux machine

  - by user305210

  I have a piece of java code running on two different machines, but on one of the linux machines, the code uses alot of CPU (close to 100% cpu usage). On the other machine the same code uses less cpu (under 3 to 4%). The machine where cpu usage is high, is a more powerful machine, more CPU and and more memory. This has started happening recently and performance on the machine with high cpu usage has degraded significantly. I am wondering if anyone has any ideas why something like this could happen, possible causes behind this etc. any guesses? No recent changes in hardware were made, no recent code updates... Thank you.

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• mod_cache serving the wrong content

  - by J. Pablo Fernández

  I'm trying to use mod_disk_cache to speed up a web site that is running on WordPress. Whenever I enable it with CacheEnable disk / and the rest being the stock Ubuntu configuration I start to get the wrong results. When I see the main page it's fine, but when I go to a specific post I get a RSS feed instead. Like if the cache is returning the wrong content. I've disabled my RewriteRules as it seems mod_cache doesn't work with that. I'm not even sure where to start to debug such a thing. Any ideas?

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• virtual machines: optimal host os to run Windows XP guest os?

  - by user61132

  My department doesn't have the budget to upgrade my ailing Dell D620 laptop. However, I do have the option to buy my own personal computer, then use my company-issued ISO image to run Windows XP as my guest os using virtualbox or vmware. Therefore, last month, I bought an Acer AX3910-U3012 desktop that had Windows 7 as the host os (and 8G RAM). In short, I was disappointed with the performance while trying to run WinXP as the guest os. (It didn't perform much better than my laptop.) Just wondering what the optimal host os would be for running Windows XP as the guest os? (No, I can't use my company-issued ISO image to build the os for my personal computer.) FWIW, I'm willing to spend up to $2k if it's REALLY worth it, but would prefer to spend no more than $1k. Also, in an effort to cut costs, I'd prefer buy a desktop instead of a laptop. Thanks for any/all feedback.

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• Windows 7 System process reading/writing like crazy

  - by Mats Ekberg

  I have a problem that my windows 7 computer sometimes starts accessing the disk like crazy for maybe 10 minutes at a time. The process in question is the "system" process. I have disabled superfetch and hibernation on my computer, if that makes any difference. I disabled those to see if they were the cause of the problems, but no change. I have 6 GB of RAM and only the web browser was started when I took the screenshot, so I don't think it was thrashing due to page faults. Any ideas on how to find the cause of this?

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• Building optimal custom machine for Sql Server

  - by Chad Grant

  Getting the hardware in the mail any day. Hardware related to my question: x10 15.5k RPM SAS Segate Cheetah's x2 Adaptec 5405 PCIe Raid cards Motherboard has integrated SAS raid. Was thinking I would build 2 RAID 10 arrays one for data and one for logs The remaining 2 drives a RAID 0 for TempDB Will probably throw in a drive for OS. Does putting the Sql Server application / exe's on a raid make a difference and is there any impact of leaving the OS on a relatively slow disk compared to the raid arrays? I have 5/6 DBs combined < 50 gigs. With a relatively good / constant load. Estimating 60-7% reads vs writes. Planning on using log shipping as well if that matters. Any advice or suggestions?

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• Image file can't be opened by windows store app if the file is in the Ext4's external hard disk

  - by ? ?

  My question is described below: I have two disks, external hard disk and removable disk. They are formatted with EXT4. I put the same image in the disks, and use Ext2Fsd to mount the disks. I open the file in win8, and it will default open by the windows store app : photos. It will be success to open if the file is in the Ext4's removable disk. It will be failed to open if the file is in the Ext4's external hard disk. I don't know why it will be failed to open if the file is in the Ext4's external hard disk. Does anyone have similar experiences?

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• Freebsd or Linux? as BGP router over 100mbps

  - by Yucong Sun

  I am building a server to act as a BGP border router for my 100mbps uplink in ISP. I needs these feature: 1) Dual stack BGP peering/routing (at least 100Mbps, maybe more). 2) Potential full internet BGP feed. 3) Some basic ACL functionality. The hardware is L3426/8G ram. NIC will be on-board dual port Broadcom 5716. I've worked with Linux extensively before and it seems to be able to handle 100mbps, but I heard FreeBSD is faster on networking stuff. Which one should I use? And do we have some performance benchmark numbers out there? Cheers.

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• Can I monitor active user count on my iis sites?

  - by Dejan.S

  We are having problems with performance on our server that host our websites that the processor gets upp to 90%. I would like to monitor the amount of users active on your sites that are published on the iis. My question, is this possible? is there any software for this? EDIT current (like this second) visitor count on all the active websites on our iis REASON FOR THIS if i can get the visitor amount on the days the CPU is not overloaded and and compare it to the days it is then i atleast know that this CAN be a reason why this is happening and i can take it from there. Otherwise i can focus on the code on the sites, or maybe google crawler is causing this, there are manythings that can cause this you know? for me this is just a simple way of troubleshooting.

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• How to diagnose very slow pagefile

  - by svick

  Quite often, one of the applications I use freezes (“does not respond”) for a while, in extreme cases for few minutes. This happens especially when when switching apps. During this time, the HDD light flashes constantly and perfmon show that HDD is used 100% of the time (OTOH, CPU isn't) and that pagefile is being read (which is to be expected when switching apps), but at a very slow rate. When I sort the disk table in perfmon by read or write, the file read and wrote the most is the pagefile, but it's still quite low rate (I don't remember the numbers). How can I diagnose what's causing this? I use Windows Vista, and the computer is quite ordinary two years old laptop.

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