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• IPC between multiple processes on multiple servers

  - by z8000

  Let's say you have 2 servers each with 8 CPU cores each. The servers each run 8 network services that each host an arbitrary number of long-lived TCP/IP client connections. Clients send messages to the services. The services do something based on the messages, and potentially notify N1 of the clients of state changes. Sure, it sounds like a botnet but it isn't. Consider how IRC works with c2s and s2s connections and s2s message relaying. The servers are in the same data center. The servers can communicate over a private VLAN @1GigE. Messages are < 1KB in size. How would you coordinate which services on which host should receive and relay messages to connected clients for state change messages? There's an infinite number of ways to solve this problem efficiently. AMQP (RabbitMQ, ZeroMQ, etc.) Spread Toolkit N^2 connections between allservices (bad) Heck, even run IRC! ... I'm looking for a solution that: perhaps exploits the fact that there's only a small closed cluster is easy to admin scales well is "dumb" (no weird edge cases) What are your experiences? What do you recommend? Thanks!

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• What performance degradation to expect with Nginx over raw Gunicorn+Gevent?

  - by bouke

  I'm trying to get a very high performing webserver setup for handling long-polling, websockets etc. I have a VM running (Rackspace) with 1GB RAM / 4 cores. I've setup a very simple gunicorn 'hello world' application with (async) gevent workers. In front of gunicorn, I put Nginx with a simple proxy to Gunicorn. Using ab, Gunicorn spits out 7700 requests/sec, where Nginx only does a 5000 request/sec. Is such a performance degradation expected? Hello world: #!/usr/bin/env python def application(environ, start_response): start_response("200 OK", [("Content-type", "text/plain")]) return [ "Hello World!" ] Gunicorn: gunicorn -w8 -k gevent --keep-alive 60 application:application Nginx (stripped): user www-data; worker_processes 4; pid /var/run/nginx.pid; events { worker_connections 768; } http { sendfile on; tcp_nopush on; tcp_nodelay on; keepalive_timeout 65; types_hash_max_size 2048; upstream app_server { server 127.0.0.1:8000 fail_timeout=0; } server { listen 8080 default; keepalive_timeout 5; root /home/app/app/static; location / { proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header Host $http_host; proxy_redirect off; proxy_pass http://app_server; } } } Benchmark: (results: nginx TCP, nginx UNIX, gunicorn) ab -c 32 -n 12000 -k http://localhost:[8000|8080]/ Running gunicorn over a unix socket gives somewhat higher throughput (5500 r/s), but it still does't match raw gunicorn's performance.

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• Debian x86_64 + Nginx + PHP5-FPM optimization

  - by user55859

  I used to have a VPS (512MB) from Linode and I was running nginx + php5-fpm (which comes with php5.3.3) on Debian Lenny (i686). The total memory usage was about 90-100MB. Now I have another VPS (different hosting company) and I also run nginx + php5-fpm on Debian Lenny (x86_64). The system is 64-bit, so the memory usage is higher now, about 210-230MB, which I think is too much. Here is my php5-fpm.conf: pm = dynamic pm.max_children = 5 pm.start_servers = 2 pm.min_spare_servers = 2 pm.max_spare_servers = 5 pm.max_requests = 300 That's what top command tells me: top - 15:36:58 up 3 days, 16:05, 1 user, load average: 0.00, 0.00, 0.00 Tasks: 209 total, 1 running, 208 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.9%id, 0.1%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 532288k total, 469628k used, 62660k free, 28760k buffers Swap: 1048568k total, 408k used, 1048160k free, 210060k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 22806 www-data 20 0 178m 67m 31m S 1 13.1 0:05.02 php5-fpm 8980 mysql 20 0 241m 55m 7384 S 0 10.6 2:42.42 mysqld 22807 www-data 20 0 162m 43m 22m S 0 8.3 0:04.84 php5-fpm 22808 www-data 20 0 160m 41m 23m S 0 8.0 0:04.68 php5-fpm 25102 www-data 20 0 151m 30m 21m S 0 5.9 0:00.80 php5-fpm 10849 root 20 0 44100 8352 1808 S 0 1.6 0:03.16 munin-node 22805 root 20 0 145m 4712 1472 S 0 0.9 0:00.16 php5-fpm 21859 root 20 0 66168 3248 2540 S 1 0.6 0:00.02 sshd 21863 root 20 0 66028 3188 2548 S 0 0.6 0:00.06 sshd 3956 www-data 20 0 31756 3052 928 S 0 0.6 0:06.42 nginx 3954 www-data 20 0 31712 3036 928 S 0 0.6 0:06.74 nginx 3951 www-data 20 0 31712 3008 928 S 0 0.6 0:06.42 nginx 3957 www-data 20 0 31688 2992 928 S 0 0.6 0:06.56 nginx 3950 www-data 20 0 31676 2980 928 S 0 0.6 0:06.72 nginx 3955 www-data 20 0 31552 2896 928 S 0 0.5 0:06.56 nginx 3953 www-data 20 0 31552 2888 928 S 0 0.5 0:06.42 nginx 3952 www-data 20 0 31544 2880 928 S 0 0.5 0:06.60 nginx So, the question is there any way to use less memory? Btw, I have 16 cores and it would be nice to make use of them...

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• Can a website company that builds 4-5 websites a year afford dedicated hosting?

  - by Petras

  We manage about 30 websites that use shared ASP.NET SQL Server web hosting. These are typical small/medium business websites and they perform fine in this environment. Recently I was looking at VPS hosting in this thread http://serverfault.com/questions/128329/how-do-you-host-multiple-public-facing-websites-on-a-vps After contacting a provider in one of the replies I was told that VPS hosting is not recommended for 30 sites, even if they are small. The resource requirements might be too great even for VPS. So I should turn to dedicated hosting. The lowest cost dedicated hosting is $219 per month (see http://www.serverintellect.com/dedicated/pentiumdservers.aspx). But this is only for a single processor which seems too light for a machine running both IIS and SQL. In our office all the developers work on quad cores so I assume I’d really need the Quad Processor. However, this starts at $599 monthly. Now, I won’t be able to transfer all of our 30 sites to this machine. I’d only be able to transfer say 5 or 6. However, moving forward, I’d be able to host all future sites on this machine. This amounts to 4-5 per year. Let’s look at the economics. Shared hosting costs are typically $16.95 monthly (see http://www.crystaltech.com/dotnet.aspx). So here’s the dilemma First months costs: $599 First month revenue: 6x$16.95 = $101.7 Loss in first month: $497.3 First year costs: $599x12=$7188 First month revenue: 6x$16.95x12 + 5x$16.95x6(averaged) = $1728.9 Loss in first year: $5459.1 Clearly it is going to take years for this server to pay for itself. It just doesn’t seem economical! Am I missing something here, or is dedicated not the way to go with the amount of sites we build?

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• Is a Hyperthreaded CPU more powerful and more efficient than a Dual-core CPU? [closed]

  - by user1811864

  which computer to choose with Pentium processor hello they are getting rid of the old computer equipment in the office and i have to choose the computer to take home i get first choice to pick. -15 inch lcd screen 4 gb of ram core 2 duo dual Core E8400 3.00 GHz dvd writer windows vista/ linux -15 inch crt monitor with 2 gb ram and pentium 4 2 ghz single core HT technology windows xp hardisks both 250 GB my friend is telling me to choose the second one Pentium single core HT because he told me it runs faster becuase of HT technology and cooler and consumes less current electricity so it wont get overheated because it has HT technology so it's high definition for encoding and watching HD movies and HD sound and is like a gaming pc to play internet games. And also he said the dual core 8400 runs at 3 ghz compared to the 2 ghz so it heats very much because of the two extra cores so it takes more current raising electricty bills and is not good for gaming and watching HD movies and internet flash animations and games because of getting heated everytime. And he wants to choose and take the E8400 because he has air conditioning at home so it will be safe from heating. So which one computer should i take is it really faster because of the HT High definition technology and will i be able to play internet flash card games better and watch good HD movies Youtube etc and play all the music and songs.

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• AMD Phenom II X2 555 BE, core unlock suddenly not working?

  - by user328271

  I've had a Phenom II X2 555 BE for around 2 - 3 years. When I got it, I immediately core unlocked it with my ECS A880GM-A3 mobo, which makes it turn into a Phenom II X4 B55. A few days ago, I installed Windows 7 64 bit to compensate for my 4 gigs of ram. When I start my system with its cores unlocked, it will restart after the BIOS screen. If I disable the core unlock, it boots to OS just fine. My question is: Does 64 bit OS makes a difference in core unlocking? Does my 3rd and 4th core burnt out? Also extra info: I tried core unlocking but keeping the 3rd and 4th core disabled and it still won't boot into OS. Could it be motherboard problems? Sorry for bad English. I will try to give additional information if needed. Thanks! Also it is worth mentioning I'm no computer expert but I tried to make my explanation as short as possible. I also asked my question on TomsHardware, but I had no answer till now so I decided to ask here too. anyone...?

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• Nginx + PHP-FPM Too Many Resources

  - by user3393046

  My Server has the following Specs CPU: 6 Cores Intel(R) Xeon(R) CPU E5-2650 v2 @ 2.60GHz RAM: 32 GB I have a problem with nginx+php-fpm. They are taking too many resources for an unknown reason. Even if i restart the nginx + php-fpm the start up processes will use many resources. My nginx Config is the following: user nginx; worker_processes auto; error_log /var/log/nginx/error.log warn; pid /var/run/nginx.pid; worker_rlimit_nofile 300000; events { worker_connections 6000; use epoll; } http { include /etc/nginx/mime.types; default_type application/octet-stream; log_format main '$remote_addr - $remote_user [$time_local] "$request" ' '$status $body_bytes_sent "$http_referer" ' '"$http_user_agent" "$http_x_forwarded_for"'; access_log /var/log/nginx/access.log main; sendfile on; #tcp_nopush on; keepalive_timeout 65; #gzip on; include /etc/nginx/conf.d/*.conf; } My php-fpm pool config is the following [www] user = nginx group = nginx listen = /var/run/php5-fpm.sock listen.owner = nginx listen.group = nginx listen.allowed_clients = 127.0.0.1 pm = ondemand pm.max_children = 1500; pm.process_idle_timeout = 5; chdir = / security.limit_extensions = .php I'm using on pm.ondemand since my website has to support many concurrent connections at the same time and i was unable to to it with dynamic/static. I guess this isnt the problem because as i said earlier when i restart nginx+php-fpm at the same time, they are taking too much resources without any request. Here is the screenshot with the CPU Usage http://s28.postimg.org/v54q25zod/Untitled.png

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• 100% CPU load on Ubuntu 10.04.3 LTS 64bit

  - by deadtired

  I have 2 days since I am trying to fix this issue, with no success. The server is a mysql database server. Hardware: DELL Poweredge 1950, 2x Intel Xeon Quad Core E5345 @ 2.33GHz, 16 Gb mem, 2x 146Gb SAS (software RAID1) Software: Ubuntu 10.04.3 LTS, MySQL 5.1.41 Issue: while mysql is not used and runs with no database, everything seems alright. As soon as I install a database, it has the reason to bring all 8 cores in 100% with low memory consumption. So, you can imagine the load average goes high (I saw 212 load average for the first time). The server doesn't become unresponsive, but you can see it's slow while browsing the project installed. Additional info: the database used is not more than 24MB and it was moved from a server with less resources and a lot more larger databases. So it's not the database/project. my.cnf is not a reason also, as I used both default one and the one I use on the same distribution on another server.What is interesting is that mysql doesn't close any process and runs to the limit of the max_connections. Logs are quiet. Nothing there. I switched to this Ubuntu version after I suspected some problems in the newly Ubuntu 11.10 server. This one worked alright for an hour after I made a kernel upgrade to 3.0.1 (it was using the memory also) I tested disk speed and seems alright. Some more output on the running server: dstat -cndymlp -N total -D total 3: htop command: Idea? Did anyone meet the same problem? Any fix you can think of?

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• CPU temperatures high on new build after gaming

  - by Reznor

  My friend had a problem with his computer a while back. His games were crashing, even within the menus. He was stumped as to what the problem was, so I posted on here requesting help. He found out the day later, when his computer would start up but wouldn't display anything on the screen. His video card must have came screwed up. So, he got a replacement. Now, there's a new problem. His temperatures, which were acceptable before, are now insanely high. His GPU temperature runs 70-80c, which is understandable considering he's running his games maxed out, but the real problem here is his processor and motherboard temperatures. All four of his cores are running at 88-90c after coming out of a game. His motherboard temperature was also 70c at one point. In terms of cooling, his case should definitely be adequate. He has an Antec Twelve Hundred. He's using stock fans. The cable management in his case is very good; better than average. He's using the stock heatsink with the processor too, but note, it was fine before the replacement, so it isn't like there's some inherent problem. He has checked the case too. Everything's fine! No cables in the way. The heatsink is seated properly. He turned his case fans up to high, as well, but the temperatures are persisting. Could the processor be overheating due to running games maxed out? Any ideas?

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• Is there any way to limit the turbo boost speed / intensity on i7 lap?

  - by Anonymous

  I've just got a used i7 laptop, one of these overheating pavilions from HP with quad cores. And I really want to find a compromise between the temp and performance. If I use linpack, or some other heavy benchmark, the temp easily gets to 95+, and having a TJ of 100 Degrees, for a 2630QM model, it really gets me throttling, that no cooling pad or even an industrial fan could solve. I figured later that it is due to turbo boost, and if I set my power settings to use 99% of the CPU instead of 100%, and it seems to disable the turbo boost, so the temp gets better. But then again it loses quite a bit of performance. The regular clock is 2GHz, and in turbo boost it gets to 2.6Ghz, but I just wonder if I could limit it to around 2.3Ghz, that would be a real nice thing. Also there is another question I've hard time getting answer to. It seems to me that clocks are very quickly boosting up to max even when not needed, eg, it's ok if the CPU has 0% load, the clocks get to their 800MHz, but even if it gets to about 5% it quickly jumps to a max and even popping up turbo, which seems very strange to me. So I wonder if there is any way to adjust the sensitivity of the Speed Step feature. I believe it would be more logical to demand increased clock if it hits let's say 50% load. I do understand that most of these features are probably hardwired somewhere in the CPU itself or the MB, which has no tuning options just like on many laptops. But I would appreciate if you could recommend some thing, or some software. Thanks

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• "iostat" command different in two equal machines

  - by Oz.

  We have several machines on Amazon (ec2) of the type c1.xlarge with 8 cpus, running the Amazon AMI. Details on the machine: 7 GB of memory 20 EC2 Compute Units (8 virtual cores with 2.5 EC2 Compute Units each) 1690 GB of instance storage 64-bit platform I/O Performance: High API name: c1.xlarge One out of the several machines is showing a high load average, since we have run the last yum upgrade a couple of weeks a go. We did not yet update the other machines, and everything looks normal on them. The strange thing is that the top command not showing any hint for the cause of the load. CPUs are - 4.8%us, 1.1%sy, 0.0%ni, 94.1%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st. Mem is about 1.5GB free. Any idea what could it be, or where else can we check? iostat command on the proper machine: avg-cpu: %user %nice %system %iowait %steal %idle 8.97 0.03 4.46 0.19 0.14 86.23 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 1.60 0.69 55.38 587620 47254184 xvdfp2 2.64 1.10 61.04 934786 52091056 xvdfp4 0.86 0.19 41.72 163866 35601920 xvdfp1 4.37 36.59 73.89 31220810 63051504 xvdfp3 8.03 7.08 94.63 6045402 80749184 iostat command on problematic machine: avg-cpu: %user %nice %system %iowait %steal %idle 9.29 0.04 5.55 0.26 0.11 84.74 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn xvdap1 2.13 3.34 68.85 246244 5077888 xvdfp1 7.60 74.31 104.88 5480362 7734840 xvdfp3 13.22 73.67 125.00 5433386 9218600 xvdfp4 1.11 0.76 65.08 55762 4799248 xvdfp2 4.16 3.31 99.17 243818 7313264 Many thanks for the help.

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• Troubleshooting an overheating CPU

  - by Jeff Fry

  I & my father just recently put together a new PC. Specs below. From the very beginning, on boot it will often complain that the CPU is too hot. If I sit in BIOS and watch the CPU, it'll drop back down from red to blue (<72C), at which point I've tended to just boot into Windows...and haven't had any problems. In fact, I've played a couple hours straight of Skyrim at max settings, and not had any visible issues. That said, I've occasionally walked away & come back to find that it's crashed. Yesterday, it crashed (while idle) twice in 12 hours, which shifted the balance from busy-with-life to nervous-I'm-about-to-melt-something. I just installed Core Temp which is showing my 4 cores fluxuating between 70-98C. I'm guessing at this point that the CPU fan may be incorrectly installed or defective. My first thought is to either (a) add water cooling (which the case supports) and / or (b) replace the CPU fan with an after-market one. That said, I'm very open to suggestions. A note, while I certainly don't want to burn money here, I have a baby coming any day now and am still unpacking from a recent move so if I have a choice between an option that costs money and another that takes a while...I'll happily spend a bit extra. Side question: Should I be nervous to even have this on at this point? Let me know if there's something useful I could add to my report. Otherwise, I'm looking forward to your suggestions! Thanks. CPU Intel i7-2600 CPU w/ stock fan Other HW ASUS P8Z68-V Pro motherboard 64G SSD boot drive 4 older SATA HDs GIGABYTE ATI Radeon HD6950 1 GB DDR5 8G Kingston T1 Series RAM Corsair 650W Gold Certified power supply Antec P280 case

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• Why Would one VLAN have no Communication on one Switch?

  - by Webs

  So the problem is we have a device or host that needs to communicate on a specific VLAN. This VLAN is not new, it is running all throughout our environment and works fine. But the VLAN was recently configured on the switch in question, a Cisco 3750. The DHCP server is handing out addresses on that VLAN with no problem. I have verified the cable between the host and switch and tried multiple hosts, but none of them can communicate or get an address. I plugged my laptop into an empty port which had a different VLAN assigned and immediately got a DHCP address. When I changed that port to the same VLAN I'm having issues with I got the same problem. The laptop just sits there and tries to DHCP an address but nothing happens. I double checked the cores and their Layer 3 VLAN config and its fine too. Plus I figured the issue couldn't be with them because the VLAN works fine everywhere else it exists. So the only other thing I can think of is the switch, but the VLAN exists on the switch and seems to be configured correctly. The trunks appear to be configured just fine as well too. Anyone have any ideas? I'm lost on this one.

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• PC dies when running at 100% CPU

  - by user155631

  I recently wrote some Java code to generate images of the Mandelbrot set (fractal). I made use of the new Fork/Join facility in Java 7 to run separate threads on all four cores (2 real, 2 virtual)simultaneously, using a large number of iterations for greater accuracy. The problem is, the process runs fine for about a minute, and then it's as if someone has pulled the plug and the PC just dies. I thought it must be the CPUs overheating, so I ran Real Temp to monitor the temperature. It's an Intel i3 processor. I can see the temperature creeping up to 70 degrees, and then it seems to level off there and run for about another 30 seconds before dying. According to Real Temp, there's still a gap of 35 degrees between the actual temperature and TJ max. I also tried disabling "CPU TM function" in the BIOS, but the problem still occurs. A colleague suggested that it might be a power supply problem, so I borrowed a more powerful PSU (can't remember what wattage it was, but it's higher than mine which is 500W). The exact same thing still happens though. Is anyone able to suggest what the problem might be, or what I can try next?

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• Some Apps don't start on Windows 8 Release Preview

  - by Exa

  I recently installed the Release Preview of Windows 8 in a virtual machine. Some apps do not work. When I open them (by clicking on their tile in the start screen) I see a splash screen and nothing else happens. Sometimes the app crashes after 30 seconds, sometimes it just keeps on loading. A good example is the "Map"-App from Windows 8 or the app "Cookbook" by Bewise. I installed Cookbook and when I had a look at the task manager I saw that it was the 32bit version running, but I have an x64 Windows 8... Could this be a problem? Shouldn't the Windows Store download the correct version? This is the setup of my virtual machine: Windows 8 Release Preview x64 Oracle VirtualBox 4 of 8 cores from host system 8 of 16 GB RAM from the host system 256 MB graphics memory guest additions installed resolution 1920 x 1080 Do you need further information? Unfortunately there is no error message... I just see the start screen of the app with its logo and it keeps loading, but nothing happens. Other Apps (like Mail, Video, Social, etc.) work fine.

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• Gaming blew fuse: how to overcome?

  - by George Tomlinson

  I've been gaming for a while now. When playing certain games this PC goes into overdrive. The fan/fans start/s to sound like a jet engine it/they get/s so busy. Also I have smelt burning when this has happened. The fuse blew on the 4 socket adapter I was using recently. On the following thread someone said this could be due to the PSU not being strong enough to handle the load, in what it seems could be a related issue someone had, although the person who posted this question did say that blowing a fan on their PC stopped it crashing in that case: http://www.tomshardware.co.uk/answers/id-2047543/gtx-650-overheating-issue.html. This is exactly what they said: Your GPU isn't overheating. 70+ before it would shutdown and cause a restart. Make sure your PSU is strong enough to handle your new system at load and possibly run Memtest to check your RAM (although not BSOD'ing and just shutting down points to the PSU). This (the PSU part) makes more sense to me than it being to do with dust etc, since it seems a more plausible explanation of why the fuse blew. The PC has no problems except when playing certain games: i.e. TERA Rising and WoW with add-ons (I think WoW is ok as long as I don't have more than 1 add-on (Healers Have To Die)). I'm just wondering if anyone knows or can suggest what I might be able to do to be able to play these games without this problem occurring. The PC's spec is this: Display: NVIDIA GeForce GTX 650 8GB RAM (6 available) Processor: AMD FX (tm) - 8120 Eight-Core Processor - 3.1 GHz, 4 Cores, 8 Logical Processors I have read on another post that forcing vsync in the Nvidia Control Panel helped with what seems could be a similar problem, so I plan to see if that solves it, God permitting.

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• What hardware would I need (approx) to run ESXi server?

  - by mr.b

  Hi, I am considering to purchase off-the-shelf commodity hardware in order to build server that will host virtual machines using ESXi server. Intended purpose for this server is NOT mission critical tasks. It will have to run perhaps 20-50 Windows XP/Vista/7 virtual machines (in total, but closer to 20 figure). Each guest would have to have 1-2 GB of ram, and probably two-three times more disk space than guest OS needs with clean install and all updates applied (that would be around 6-8 GB for XP, and i believe closer to 10-15 for win7). Those guests will act as a test ground for a new product that is network management software, thus guests will idle most of their time once initially loaded, but if I give them some task to complete, they should be able to perform reasonably well. Now, from what I have learned... CPU is usually not much of an issue (6 cores would do it), memory should not be lacking, but doesn't have to be sum of all guests, because of overcommitment... That leads me to IO, which is, as it seems, the bottleneck. Since I have very little experience with ESXi (and ESX, too) server, I'd like to ask: How much memory could I save by overcommitment, and how does it affect performance? Is 6-core cpu enough to run above described system? Would it be possible to run entire server off two (or even one) SSD drives (to host system virtual disks, with few additional HDDs (2-3) in RAID 0 to be used as secondary storage? I read somewhere that ESXi allows having something like "master image", essentially virtual machine that is "deployed" many times, so that disk space can be saved by having only differences stored by specific guests, instead of copying around whole virtual disks. Is this true, and how can this help me? Are there any other things I need to take into consideration when building this off-the-shelf solution? I should probably mention here that I'm fully aware of issues like SPOF regarding power supply, raid 0, etc, but since it's only a testing ground and not a production system, it's not so important for me. Thanks, B.

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• What may the reason of slowness be (see details in message body)?

  - by Ivan

  I've got a really weird situation I'm beating to solve. A performance problem which looks really like an empty waiting sequence set in code (while it probably isn't so). I've got a pretty powerful dedicated server (10 GB RAM, eight Xeon cores, etc) running Ubuntu 10.04 with all the functionality services (except OpenVPN server used to provide secure access to clients) deployed in separate VirtualBox (vboxheadless) machines (one for the company e-mail server, one for web server and one for accounting/crm server (Firebird + proprietary app server working with Delphi-made clients)). CPU load (as "top" says) is almost always near zero. Host system RAM is close to 100% usage but not overloaded (as very little swapping gets used, and freed (by stopping one of VMs) memory doesn't get reused any quickly). Approximately 50% of guests RAM is used. iostat usually shows near zero %util. Network bandwidth seems to be underused. But the accounting/crm client (a Win32 Delphi application run on WinXP machines) software works hell-slow with this server (and works much better using an inside-LAN Windows server). I just can't imagine what can make it be slow if there are so plenty of CPU, RAM, HDD and bandwidth resources available on clients and on the server even in their hardest moments. Saying bandwidth is underused I not only know that clients and the server are connected to the Internet with a bigger channels than really used (which leaves the a chance they may have a bottleneck of a sort on the route between them), I've tested bandwidth between clients and the server by copying files among them.

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• Second CPU missing of Dual Core

  - by Zardoz

  My Lenovo T61 has a dual core CPU. I just noticed that under Ubuntu 10.10 only one CPU is recognized. I know that once both CPUs worked. Not sure since when the second CPU is missing. Maybe since the last kernel update. Currently I am using linux-image-2.6.35-23-generic (for x86_64). What can I do to enable the second CPU again? Here the ouput of /proc/cpuinfo processor : 0 vendor_id : GenuineIntel cpu family : 6 model : 23 model name : Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz stepping : 6 cpu MHz : 800.000 cache size : 3072 KB physical id : 0 siblings : 1 core id : 0 cpu cores : 1 apicid : 0 initial apicid : 0 fpu : yes fpu_exception : yes cpuid level : 10 wp : yes flags : fpu vme de pse tsc msr pae mce cx8 sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm constant_tsc arch_perfmon pebs bts rep_good aperfmperf pni dtes64 monitor ds_cpl vmx est tm2 ssse3 cx16 xtpr pdcm sse4_1 lahf_lm ida dts tpr_shadow vnmi flexpriority bogomips : 4189.99 clflush size : 64 cache_alignment : 64 address sizes : 36 bits physical, 48 bits virtual power management: Any help is welcome. I really need that CPU power for my work here.

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• What is the max connections via remote desktop for a small server?

  - by Jay Wen

  I have a small server running MS Server 2012. The CPU is a Xeon E3-1230 V2 @ 3.30GHz, 4 Cores, 8 Logical Processors, 8 GB RAM. Main HD is a Samsung 840, and the big storage is a 4 disk WD Black Raid 10 Array in a Synology NAS enclusure. My question is: given this hardware, approximately how many users can the system support via "Remote Desktop Connection"? Assume there are no licensing limits. These are not admin users. I know there is a two admin limit. This boils down to: What resources does one remote connection require? RAM? % of the CPU? Networking bandwidth? I guess the base case would be for a conection where the user is inactive or simply browsing cnn. Once you know this, you know how many you could fit on the machine before something is maxed-out. In reality, users would be mostly on Excel (multi-MB spreadsheets). I know the approx. resources currently required by each copy of Excel.

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• CPU usage always below 10% in windows server 2008 r2 x64

  - by ???

  I am using a server with windows server 2008 r2 running on it to run my program. The CPU of the server is Intel xeon x5570 2.93GHz with 2 processors, 8 cores per processer. However, I found that the cpu usage is almost always below 10% even I use 32 threads in my program. And I also found that sometimes the cpu usage could reach as high as 93% through the task manager when running my program and at that moment my program has processed over 1000 files per second while normally, it only processed over 50 files per second. However, this does not happen often. I use tools downloaded from the internet to make sure no core sleeps when the server is on, nothing changed. Also, I edited the windows register to make sure that I, as an administer, have no cpu usage limit. But it changed nothing. Is there anyway that I can make full use of my cpu? That is to say that each core runs a thread of my program and the total cpu usage could reach over 50% when I use a reasonable number of threads in my program. Did this happen to anyone of you? And could you help me with this ? Thank you!

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• Terminal Server CPU usage at 100%

  - by Light1c3

  I'm running a terminal server with around 50-60 users,and every so often the server will go from 40% usage to 100%. I took a closer look an it seems every time this happens, a different user or two seem to be caught in a loop and end up using < 30% where the rest of the users only use a maximum of 5%. The company behind the software we use clame it's due to the servers inadequate hardware (It's a VM system running on a dual - quad core setup) which to me sounds like BS! I'm fairly new to this level of IT so if I misspoke I apologize. I have no way to prove it but I believe adding more raw hardware power wont do me any good as this to me seems like a bug in their software, and it will suck up as much ( or little) CPU as it's given. The VM in question has 4 vCPU cores and 12 GB RAM available, and is running Windows Server 2008, 64-bit Thanks in advance for your help! Note: I have the same question posted on SO, but was pointed in this direction so just in case, here is a link to the post http://stackoverflow.com/questions/17276602/termserver-cpu-at-100

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• How to improve network performance between two Win 2008 KMV guest having virtio driver already?

  - by taazaa

  I have two physical servers with Ubuntu 10.04 server on them. They are connected with a 1Gbps card over a gigabit switch. Each of these host servers has one Win 2008 guest VM. Both VMs are well provisioned (4 cores, 12GB RAM), RAW disks. My asp.net/sql server applications are running much slower compared to very similar physical setups. Both machines are setup to use virtio for disk and network. I used iperf to check network performance and I get: Physical host 1 ----- Physical Host 2: 957 Mbits/sec Physical host 1 ----- Win 08 Guest 1: 557 Mbits/sec Win 08 Guest 1 ----- Phy host 1: 182 Mbits/sec Win 08 Guest 1 ----- Win 08 Guest 2: 111 Mbits /sec My app is running on Win08 Guest 1 and Guest 2 (web and db). There is a huge drop in network throughput (almost 90%) between the two guest. Further the throughput does not seem to be symmetric between host and guest as well. The CPU utilization on the guests and hosts is less than 2% right now (we are just testing right now). Apart from this, there have been random slow downs in the network to as low as 1 Mbits/sec making the whole application unusable. Any help to trouble shoot this would be appreciated.

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• How should I configure backup of my server?

  - by ed209

  I have just rented a dedicated server. If it helps this is the config I have: CPU1 Intel(R) Core(TM) i7-2600 CPU @ 3.40GHz (Cores 8) RAM 15975 MB Disk /dev/sda doesn't contain a valid partition table (=> /dev/sda doesn't) Disk /dev/sdc doesn't contain a valid partition table (=> /dev/sdc doesn't) Disk /dev/sdb doesn't contain a valid partition table (=> /dev/sdb doesn't) Disk /dev/sda: 120.0 GB (=> 114 GIB) Disk /dev/sdc: 3000.6 GB (=> 2861 GIB) Disk /dev/sdb: 3000.6 GB (=> 2861 GIB) /dev/sda is a 120GB SSD. This is where I have Ubuntu/lamp installed. It's the drive that will run my site. With the account I got two other drives of 3000GB each which I really don't need but they came with the account. I figured I could use these to back up my main 120gb drive. So a couple of things I wondered were: Should I use these for backups? How should I back up. The data I want to back up is a user uploads directory full of images and the database. Everything else is either in a code repo or backed up some other way. For example, it would be nice to know there is a disk image of the 120gb drive somewhere that I can copy over should there be any problems but equally I don't mind doing a fresh install of all the software and copying over just the images and database dump. Thanks for your advice! (also, happy to not use the two other drives and backup elsewhere if it's more sensible)

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• file read performance degrades as number of files increases

  - by bfallik-bamboom

  We're observing poor file read IO results that we'd like to better understand. We can use fio to write 100 files with a sustained aggregate throughput of ~700MB/s. When we switch the test to read instead of write, the aggregate throughput is only ~55MB/s. The drop seems related to the number of files since the throughput for read and write are comparable for a single file then diverge proportionally as we increase the number of files. The test server has 24 CPU cores, 48GB of memory, and is running CentOS 6.0. The disk hardware is a RAID 6 array with 12 disks and a Dell H800 controller. This device is partitioned with ext4 using the default settings. Increasing the readahead (using blockdev) improves the read throughput significantly but it still doesn't match write speed. For instance, increasing the readahead from 128KB to 1M improved the read throughput to ~145MB/s. Is this a known performance issue in our OS/disk/filesystem configuration? If so, how can we tell? If not, what tools or tests can we use to further isolate the issue? Thanks.

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