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• What happens when a computer program runs?

  - by gaijinco

  I know the general theory but I can't fit in the details. I know that a program resides in the secondary memory of a computer. Once the program begins execution it is entirely copied to the RAM. Then the processor retrive a few instructions (it depends on the size of the bus) at a time, puts them in registers and executes them. I also know that a computer program uses two kinds of memory: stack and heap, which are also part of the primary memory of the computer. The stack is used for non-dynamic memory, and the heap for dynamic memory (for example, everything related to the new operator in C++) What I can't understand is how those two things connect. At what point is the stack used for the execution of the instructions? Instructions go from the RAM, to the stack, to the registers?

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• Win 7 running slowly with low CPU usage and memory

  - by guywhoneedsahand

  I have a relatively new (under 2 yrs old) windows 7 machine. It has 9GB of RAM, and an i7 core CPU (930 @ 2.8GHz w/ 8 CPUs). After about 8 months since a clean install, I noticed my computer was running slowly. I figure it was fragmentation etc, and I did a complete wipe & clean reinstall. However, my problems are somehow persisting. The computer is running painfully slowly (but in leaps and bounds - sometimes it will work fine for 3 hrs, then suddenly freeze up just from clicking the start button). The 'freezes' happen randomly - not during any especially intensive computing. I initially thought something might be eating through my CPU and/or Memory, but Task Manager indicates that neither the CPU or Memory spike. In fact, even during serious lag, CPU usage remains at less than 5% and Memory at ~ 1.5GB. It's beyond me why a fresh install on a powerful machine is performing so poorly... and it certainly is frustrating! What could be causing the poor performance, and what can I do to fix it?

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• Windows Terminal Server: occasional memory violation for applications

  - by syneticon-dj

  On a virtualized (ESXi 4.1) Windows Server 2008 SP2 32-bit machine which is used as a terminal server, I occasionally (approximately 1-3 event log entries a day) see applications fail with an 0xc0000005 error - apparently a memory access violation. The problem seems quite random and only badly reproducable - applications may run for hours, fail with 0xc0000005 and restart quite fine or just throw the access violation at startup and start flawlessly at the second attempt. The names of executables, modules and offset addresses vary, although a single executable tends to fail with same modules and the same memory offset addresses (like "OUTLOOK.EXE" repeatedly failing on module "olmapi32.dll" with the offset "0x00044b7a") - even across multiple user's logons and with several days passing without a single failure inbetween. The offset addresses seem to change across reboots, however. Only selective executables seem affected by the problem, although I may simply not be seeing a sufficient number of application runs from the other ones. I first suspected a possible problem with the physical machine's RAM, but ruled this out as a rather unlikely cause - the memory comes with ECC and I've already moved the virtual machine across several times, without any perceptable change. I've seen that DEP was enabled in "OptOut" mode on this machine: C:\Users\administrator>wmic OS Get DataExecutionPrevention_SupportPolicy DataExecutionPrevention_SupportPolicy 3 and tried changing the policy to OptIn via startup options: bcdedit.exe /set {current} nx OptIn but have yet to see any effect - I also would expect Outlook 12 or Adobe Reader 9 (both affected applications) to play well with DEP. Any other ideas why the apps may be failing?

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• Can’t connect to SQL Server 2008 - looks like Shared Memory problem

  - by user38556

  I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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• Apache process consuming all memory on the server

  - by jemmille

  I have an apache process that suddenly appears on a particular server. When it shows up it starts consuming memory at a very rapid rate, then moves on to all the swap. In all it consumes about 11GB (including swap) of memory and the server eventually becomes unresponsive. The load on the server is under 1 at all other times. The process runs as nobody and I am having a hard time tracking down the source. If i run an strace on the process and all it did was continuously dump out mprotect over and over again If i run lsof -p <pid>, I get this, but only sometimes: httpd 19229 nobody 152u IPv4 175050 crawl-66-249-67-216.googlebot.com:62336 (CLOSE_WAIT) httpd 19229 nobody 153u IPv4 179104 crawl-66-249-71-167.googlebot.com:58012 (ESTABLISHED) As long as I catch it, I can kill the process and the server almost immediately stabilizes. I have on site on the server that is getting a few thousand hits a a day that I think might be the source, but I still can't find the exact reason. Also, this is a cPanel server and I have upcp'd the server, rebuilt apache with easy apache, and rebuilt httpd.conf. It is not spawing any related processes, meaning I can find any php, mysql, cgi, etc. processes that relate to this process. It's just a loner process that balloons fast and consumes ever last MB of memory. This is on a XenServer 5.6 based VM. No other servers in the cluster are having this issue.

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• Massive Memory Leaks?

  - by Mads

  Hi, I seem to have huge memory leaks, which are confusing me. I'm running fusion 3.1 / Windows 7 on Snow Leopard. It's a clean install with all upgrades applied. I've given fusion 8GB on a 14GB machine. I've installed VS2008 & Eclipse in Windows 7. Nothing unusual. Inside Task Manager in Windows 7, my memory footprint stays reasonable, at <2GB. But in OSX, Activity Monitor shows the footprint of vmware-vmx to be much larger. It starts at 2 GB, which seems fine, but whenever I'm actually doing anything in Windows, vmware-vmx's footprint grows at a few MB per second. After 20 mins or so it's using ~10GB and everything grinds to a halt. Throughout this, Task Manager still says I'm only using 2GB. And whatever I do in windows seems to increase vmware-vmx's memory footprint. Even closing down an application seems to make it go up. So is this par for the course in fusion? I was previously using parallels 3 / Vista under Leopard, and it worked fine. I'd assumed my new fusion config would work better, but this makes it completely unusable. (And apparently I can't even ask tech support unless I buy a support package...) Any advice much appreciated. Thanks

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• How to Set up MySQL Server to utilize more memory

  - by Cyril Gupta

  Hi there, I have MySQL setup on Windows along with Plesk. The version is 5.0.45 Community. The databases I have on the server are MyISAM as well as InnoDb, but predominantly innodb. I had 8G memory on my server, but MySQL isn't going up more than 1.3G and tweaking the settings isn't helping. I tried to increase the memory allocation for innodb_buffer_pool_size, it works if I set it up to 1G, but if I set 2G, or above the server doesn't come back online! I want mySQL to use at least 5-6 Gigs of the memory I have for performance, but I can't get this to work. Can anyone please help? My mysql config file is below (there are 2 mysqld sections... when i used MySQL workbench it created another one!) [MySQLD] port=3306 basedir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL datadir=C:\\Program Files (x86)\\Parallels\\Plesk\\Databases\\MySQL\\Data default-character-set=latin1 default-storage-engine=INNODB query_cache_size=128M table_cache=1024 tmp_table_size=32M thread_cache=32 myisam_max_sort_file_size=100G myisam_max_extra_sort_file_size=100G myisam_sort_buffer_size=2M key_buffer_size=32M read_buffer_size=16M read_rnd_buffer_size=2M sort_buffer_size=8M innodb_additional_mem_pool_size=24M innodb_flush_log_at_trx_commit=1 innodb_log_buffer_size=10M innodb_buffer_pool_size=1G innodb_log_file_size=10M innodb_thread_concurrency=8 max_connections=700 key_buffer=48M max_allowed_packet=5M sort_buffer=2M net_buffer_length=4K old_passwords=1 wait_timeout=20 connect_timeout=60 [client] port=3306 [mysqld] query_cache_min_res_unit = 4096 innodb_additional_mem_pool_size = 1048576 innodb_buffer_pool_size = 1G query_cache_limit = 1048576 key_buffer_size = 8388608 sort_buffer_size = 2097144 query_cache_type = 1 query_cache_size = 312M log-slow-queries connect_timeout = 5 wait_timeout = 20 thread_cache_size = 15 read_buffer_size = 131072 table_cache = 64

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• Glassfish v3 failure when startup. "Cannot allocate memory "

  - by Shisoft

  It is clear in this Question Fail to start Glassfish 3.1: java.io.IOException: error=12, Cannot allocate memory But in my case,I have a 512M memory Ubuntu 10.04 vps.It seems that I don't need to change any configure.But when start the server,I got this exception VM failed to start: java.io.IOException: Cannot run program "/usr/lib/jvm/java-6-sun-1.6.0.22/bin/java" (in directory "/home/glassfish/glassfish/domains/domain1/config"): java.io.IOException: error=12, Cannot allocate memory So,I set <jvm-options>-Xmx512</jvm-options> to <jvm-options>-Xmx400</jvm-options> The exception remains.What did I do something wrong? result of free -m total used free shared buffers cached Mem: 512 43 468 0 0 0 -/+ buffers/cache: 43 468 Swap: 0 0 0 result of cat /proc/user_beancounters Version: 2.5 uid resource held maxheld barrier limit failcnt 146049: kmemsize 2670652 5385253 51200000 51200000 0 lockedpages 0 8 2048 2048 0 privvmpages 11134 134522 131200 262200 4 shmpages 648 1352 128000 128000 0 dummy 0 0 0 0 0 numproc 12 73 500 500 0 physpages 6519 28162 0 200000000 0 vmguarpages 0 0 512000 512000 0 oomguarpages 6527 28169 512000 512000 0 numtcpsock 4 14 4096 4096 0 numflock 0 5 2048 2048 0 numpty 1 2 32 32 0 numsiginfo 0 3 1024 1024 0 tcpsndbuf 159600 265744 20480000 20480000 0 tcprcvbuf 65536 3590352 20480000 20480000 0 othersockbuf 44232 90640 20480000 20480000 0 dgramrcvbuf 0 12848 10240000 10240000 0 numothersock 22 31 2048 2048 0 dcachesize 0 0 10240000 10240000 0 numfile 1002 1474 50000 50000 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 dummy 0 0 0 0 0 numiptent 24 24 2048 2048 0 Thanks

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• Apache memory allocation error message

  - by la_f0ka

  I'm trying to set up a medium sized Drupal 7 website on my miniserver but I keep getting a 500 error message. This is what I found in Apache's error log: [Wed Sep 12 15:02:04 2012] [notice] SSL FIPS mode disabled [Wed Sep 12 15:02:04 2012] [warn] No JkShmFile defined in httpd.conf. Using default /usr/local/apache/logs/jk-runtime-status [Wed Sep 12 15:02:04 2012] [notice] Apache/2.2.22 (Unix) mod_ssl/2.2.22 OpenSSL/1.0.0-fips mod_auth_passthrough/2.1 mod_bwlimited/1.4 FrontPage/5.0.2.2635 mod_jk/1.2.35 configured -- resuming normal operations [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] File does not exist: /home/brighton/public_html/favicon.ico [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] /usr/bin/php: error while loading shared libraries: libkrb5support.so.0: failed to map segment from shared object: Cannot allocate memory [Wed Sep 12 15:02:07 2012] [error] [client 89.16.136.28] Premature end of script headers: index.php I contacted support and they just told me I should just upgrade my package (right not I have a 512Mb account), but I am not sure if I'm buying it... even if I'm trying to access a file which only contains phpinfo(); I still get the 500. Any help would be much appreciated, and if there's need of any other information please let me know and I'll update the question. I compiled apache with tomcat because I intend to use Solr... not sure if this is relevant or not.

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• passenger and apache memory usage

  - by Brent Faulkner

  On a "CentOS release 6.2 (Final)" server (with Ruby 1.9.3 and Rails 3.2), and using more memory than expected. Looking at passenger-memory-stats I see a couple of HUGE httpd processes... any thoughts on how I can figure out what's going on and reduce the memory usage? Stats are included here... thanks! ---------- Apache processes ----------- PID PPID VMSize Private Name --------------------------------------- 1371 1 202.1 MB 0.1 MB /usr/sbin/httpd 4573 1371 210.2 MB 5.0 MB /usr/sbin/httpd 4778 1371 202.5 MB 0.6 MB /usr/sbin/httpd 4780 1371 217.6 MB 9.4 MB /usr/sbin/httpd 4781 1371 217.1 MB 9.1 MB /usr/sbin/httpd 4856 1371 202.4 MB 0.5 MB /usr/sbin/httpd 4863 1371 204.1 MB 2.1 MB /usr/sbin/httpd 5027 1371 202.4 MB 0.5 MB /usr/sbin/httpd 5043 1371 202.4 MB 0.4 MB /usr/sbin/httpd 5044 1371 205.5 MB 2.7 MB /usr/sbin/httpd 5072 1371 202.4 MB 0.5 MB /usr/sbin/httpd 5084 1371 202.4 MB 0.5 MB /usr/sbin/httpd 32111 1371 1297.0 MB 246.5 MB /usr/sbin/httpd 32579 1371 1914.3 MB 215.5 MB /usr/sbin/httpd ### Processes: 14 ### Total private dirty RSS: 493.42 MB -------- Nginx processes -------- ### Processes: 0 ### Total private dirty RSS: 0.00 MB ----- Passenger processes ----- PID VMSize Private Name ------------------------------- 4180 280.5 MB 24.4 MB Passenger ApplicationSpawner: /var/www/apps/people/current 4345 309.5 MB 53.4 MB Rack: /var/www/apps/people/current 4800 300.2 MB 55.2 MB Rack: /var/www/apps/people/current 4808 297.8 MB 52.5 MB Rack: /var/www/apps/people/current 4815 297.4 MB 52.4 MB Rack: /var/www/apps/people/current 4822 302.7 MB 55.6 MB Rack: /var/www/apps/people/current 22780 209.0 MB 0.0 MB PassengerWatchdog 22783 991.5 MB 1.3 MB PassengerHelperAgent 22785 113.4 MB 1.1 MB Passenger spawn server 22788 144.6 MB 0.0 MB PassengerLoggingAgent 22911 310.4 MB 64.0 MB Rack: /var/www/apps/people/current 22939 311.6 MB 53.5 MB Rack: /var/www/apps/people/current 26175 304.1 MB 55.8 MB Rack: /var/www/apps/people/current 26182 310.4 MB 44.0 MB Rack: /var/www/apps/people/current ### Processes: 14 ### Total private dirty RSS: 513.24 MB

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• Nginx Multiple If Statements Cause Memory Usage to Jump

  - by Justin Kulesza

  We need to block a large number of requests by IP address with nginx. The requests are proxied by a CDN, and so we cannot block with the actual client IP address (it would be the IP address of the CDN, not the actual client). So, we have $http_x_forwarded_for which contains the IP which we need to block for a given request. Similarly, we cannot use IP tables, as blocking the IP address of the proxied client will have no effect. We need to use nginx to block the requested based on the value of $http_x_forwarded_for. Initially, we tried multiple, simple if statements: http://pastie.org/5110910 However, this caused our nginx memory usage to jump considerably. We went from somewhere around a 40MB resident size to over a 200MB resident size. If we changed things up, and created one large regex that matched the necessary IP addresses, memory usage was fairly normal: http://pastie.org/5110923 Keep in mind that we're trying to block many more than 3 or 4 IP addresses... more like 50 to 100, which may be included in several (20+) nginx server configuration blocks. Thoughts? Suggestions? I'm interested both in why memory usage would spike so greatly using multiple if blocks, and also if there are any better ways to achieve our goal.

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• Can’t connect to SQL Server 2008 - looks like Shared Memory problem

  - by Proposition Joe

  I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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• Can’t connect to SQL Server 2008 - looks like Shared Memory problem

  - by user38556

  I am unable to connect to my local instance of SQL Server 2008 Express using SQL Server Management Studio. I believe the problem is related to a change I made to the connection protocols. Before the error occurred, I had Shared Memory enabled and Named Pipes and TCP/IP disabled. I then enabled both Named Pipes and TCP/IP, and this is when I started experiencing the problem. When I try to connect to the server with SSMS (with either my SQL server sysadmin login or with windows authentication), I get the following error message: A connection was successfully established with the server, but then an error occurred during the login process. (provider: Named Pipes Provider, error: 0 - No process is on the other end of the pipe.) (Microsoft SQL Server, Error: 233) Why is it returning a Named Pipes error? Why would it not just use Shared Memory, as this has a higher priority order in the list of connection protocols? It seems like it is not listening on Shared Memory for some reason? When I set Named Pipes to enabled and try to connect, I get the same error message. My windows account is does not have administrator priviliges on my computer - perhaps this is making a difference in some way (as some of the discussions in this post about an "SuperSocketNetLib\Lpc" registry key seems to suggest). I have tried restarting the SQL Server service, by the way, and also tried to get someone to log onto the machine with an admin account to restart the SQL Server service. Still no luck.

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• Idle VMware Guests Resource Consumption

  - by Ravenor

  I want to setup a number of guests with multiple CPUs (4) and at least 4Gb ram running Ubuntu Linux. These machines will mostly be idle, but from time to time their workload will require all their resources, especially the CPU. The hosts are ESXi 5.x. The question is, am I right in thinking that the resource consumption of the machines when idle will be negligible? We know this true of disk and the CPU. The only concern left therefore is memory. Since ESX over-commits memory it makes sense that unused memory of any guest is paged out. If my thinking correct?

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• Is putting the swapfile & temp folder to ramdisk a good idea in Windows 7 64 bit with lots of RAM?

  - by Tony_Henrich

  I want my Windows to run as fast as possible. If I have 12GB RAM in Windows 7 64bit, quad core CPU, and all apps fit in memory, will the swap file ever be used for anything? The question is about if it's a good idea to put the swap file in a RAM disk. Would a RAM disk help in any way or will Windows intelligently use all the available memory for all its work? I am also thinking of putting the temp folder on a RAM disk. I know the RAM disk is volatile memory and I don't care about its content if it gets lost.

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• Win 7 accessing large files uses 100% RAM

  - by user181276

  Running Win 7 64-bit SP1 with 8 GB RAM. I first noticed this problem when using the GUI to copy some large (5+ GB) files from one disk to another. What happens is the physical memory in use rises quite quickly to 100% and the system comes to a crawl. If I just start to access the file in a media player (it is a movie) the memory usage climbs up slowly but eventually reaches 100%. When copying the same files via XCOPY I do not have this problem. Using RAMMAP I see most of the memory usage is under "Mapped File" and is allocated under the "Active" column. If I select "Empty System Working Set" the RAM usage drops back down but then starts to climb back up. Any ideas on what I can check/test to eliminate this issue?

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• How does RAM fail?

  - by ethanlee16

  I have an issue with a Dell Inspiron 15 (1545) laptop that refuses to open any applications (save select Microsoft programs, e.g. Security Essentials, Ctrl Panel, Windows Explorer (not Internet), regedit, Event Viewer, etc.). I've run Microsoft Memory Diagnostics Tool and it found a 'hardware problem was detected.' Does this indicate that the RAM has failed? I notice when I open programs like Word, Excel, Internet Explorer, etc., it always give me an error from WerFault.exe saying The instruction at xxxxxxx referenced memory at xxxxxxxxx. The memory could not be written. and sometimes something about illegal instructions. If it is a hardware problem, does this mean that replacing the RAM is my only option? Again, I would also like to know if RAM can fail (like hard drives) and if malware can cause RAM to fail also.

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• Apparent leak in Mozilla Firefox

  - by LeopardSkinPillBoxHat

  I use Mozilla Firefox 3.6 all day, opening and closing tabs quite regularly. I am noticing over time that the firefox.exe process size keeps growing and growing over time. Initially I put this down to memory fragmentation caused by opening and closing tabs, but now I am suspecting that there is a memory leak in one of the add-ons that I have installed. The problem I am seeing is that when the process size gets to about 1.5GB in the "Mem Usage" stat in Task Manager (and it gets there quite regularly), Firefox freezes up. Does anyone have any ideas about how I could diagnose whether: Any of the add-ons are leaking memory? Something else is causing this problem?

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• how do applications (and OS) handle very big files?

  - by DrStrangeLove

  For instance, i have video file which is 11.8 Gb, but my RAM memory only 2 Gb.. How does VLC (or other software) handle it? How do they load it into memory? I used VMMap tool (from sysinternals) to take a look at memory, and i saw: private 160000K working set 100000K Obviously, it's much less than 11.8 Gb -So how did it happen? This question is not only about video. I'd like to know how computer, in general, handles very large files.

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• CPU I/O communication

  - by b-gen-jack-o-neill

  Hi, I know there is this question already discussed, but I still don´t understand something, so please just help me clarify it. What I understand there is 2 way to do I/O aka communicate from CPU with other HW. One is to use in and out instructions, and second is the memory mapped. But what I don´t actually understand is, is IN and OUT instructions are used, you define source port. But what is this port? I mean, is it different set of pins on CPU or what? And, to what is that port connected? And for the memory mapped, I miss just a tiny detail. Wheather memory mapped I/O must be first set by IN and OUT instructions, or does the device actually somehow itself connects to the RAM and reads it? Thanks.

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• Windows hangs on Rename, Delete and Move for specific MKV files

  - by Creativehavoc

  I have been googling this issue for a long time, and no full solutions seem to be out there. For certain mkv files, windows hangs when moving, copying, or deleting. These files play fine in a player such as GOM player. System: a fast windows 7, 64 bit box. Results: CPU change is negligible Memory usage rockets up to ~100% In cased of delete or move, "discovering files" dialogue box stays up for a long time Rename simply shows spinning icon until it finishes Action is completed after EXTREMELY long amount of time Memory usage does not return to normal "Fixes:" Disable thumbnail creation (helps for some cases) After move/rename/delete kill explorer with taskmanager, and relaunch to re-claim your memory Even with the thumbnails turned off, the issue persists. I have also tried re-muxing a file, which worked fine, but still resulted in a file with the same above issues.

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• Computer freezes for 2+ seconds, mouse still moves

  - by xsaero00

  I have this problem on my workstation. The computer would effectively freeze for 2-5 seconds for no apparent reason, then continue as normal. While frozen the mouse would still be movable, but only on one of screens in my multi-screen setup. What can be the likely cause. System: CPU: i7-920 Memory: 12G of Patriot DDR3, 6 modules OS: SLED 11, Suse Linux Enterprise Desktop, using Gnome Main board: Asus P6T Video: two Nvidia 9500GT connected to three displays I am using memory at recommended settings of 8-8-8-1333. It has an XMP profile. Th CPU is a bit overclocked to 3.3 GHz, but my cooling more than allows for it. I ran the computer with all overclocks off and lower memory speed but the issue was still there. Any ideas? Where should I start looking?

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• How to check if PAE is enabled? (Windows 7 32 bits)

  - by Altar

  How to tell for sure if PAE (Physical Address Extensions) is enabled or not? There is a SPECIFIC command I can use? I can read a registry value or something? (Windows 7 32 bits) I have found this on Internet but it doesn't answer my question: If your server has hot-add memory ability (ability to add more memory without shutting down the server !!) or data execution prevention (DEP) is enabled then PAE will be enabled automatically !! It only reformulate the question as "does my Qosmio x505 laptop support hot-add memory?"

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• RAM module randomly stopped working

  - by nhinkle

  My laptop is a Dell Inspiron e1505. It came with 2x512 MB of RAM installed, and about a year and a half ago I decided to upgrade it to 2x1 GB. I bought two 1GB memory modules from newegg and installed them, and all worked fine. Just last night my laptop was working fine; this morning I booted up and there was a BIOS warning saying "amount of system memory has changed". I tried reseating the modules, but that didn't fix it. Then I removed each one individually, and determined that one of the sticks appears to no longer be working. This happened very abruptly - I hadn't noticed any problems which might have been indicative of impending failure. Does anybody have any clue what may have caused this, and if there's any hope of making it work again? The memory only had a 30 day warranty, so I can't RMA it.

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• Compilation of Etherpad fails in an OpenVZ VE

  - by ulf

  Hi everyone. I’m almost giving up, this will be my last try: I try to compile Etherpad on my OpenVZ server. It’s running a Debian 5.0 as the host system, in the VE I’ve got Ubuntu 10.04. I installed Etherpad in this VE with the instructions from the official Ubuntu Wiki: https://wiki.ubuntu.com/Etherpad. Everything runs fine until it comes to compilation. After calling bin/build.sh as described in the wiki the first steps are running fine. But then I’m running into a memory error: java.io.IOException: Cannot run program "cp": java.io.IOException: error=12, Cannot allocate memory Well, I understand the error message but don’t see the cause. The command free tells me that there’s plenty memory left in this VE: total used free shared buffers cached Mem: 2415236 1140872 1274364 0 0 0 -/+ buffers/cache: 1140872 1274364 Swap: 0 0 0 Beautiful. But even repeating the compilation process doesn’t bring me any further. Any help would be appreciated.

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